| 1 | !Completed |
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| 2 | MODULE ocean_slab_mod |
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| 3 | |
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| 4 | ! This module is used for both surface ocean and sea-ice when using the slab ocean, |
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| 5 | ! "ocean=slab". |
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| 6 | |
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| 7 | USE dimphy |
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| 8 | USE indice_sol_mod |
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| 9 | USE surface_data |
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| 10 | USE lmdz_grid_phy, ONLY: klon_glo |
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| 11 | USE lmdz_phys_mpi_data, ONLY: is_mpi_root |
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| 12 | USE lmdz_abort_physic, ONLY: abort_physic |
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| 13 | |
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| 14 | IMPLICIT NONE; PRIVATE |
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| 15 | PUBLIC :: ocean_slab_init, ocean_slab_frac, ocean_slab_noice, ocean_slab_ice |
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| 16 | |
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| 17 | !*********************************************************************************** |
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| 18 | ! Global saved variables |
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| 19 | !*********************************************************************************** |
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| 20 | ! number of slab vertical layers |
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| 21 | INTEGER, PUBLIC, SAVE :: nslay |
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| 22 | !$OMP THREADPRIVATE(nslay) |
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| 23 | ! timestep for coupling (update slab temperature) in timesteps |
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| 24 | INTEGER, PRIVATE, SAVE :: cpl_pas |
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| 25 | !$OMP THREADPRIVATE(cpl_pas) |
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| 26 | ! cyang = 1/heat capacity of top layer (rho.c.H) |
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| 27 | REAL, PRIVATE, SAVE :: cyang |
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| 28 | !$OMP THREADPRIVATE(cyang) |
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| 29 | ! depth of slab layers (1 or 2) |
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| 30 | REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: slabh |
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| 31 | !$OMP THREADPRIVATE(slabh) |
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| 32 | ! slab temperature |
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| 33 | REAL, ALLOCATABLE, DIMENSION(:, :), PUBLIC, SAVE :: tslab |
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| 34 | !$OMP THREADPRIVATE(tslab) |
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| 35 | ! heat flux convergence due to Ekman |
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| 36 | REAL, ALLOCATABLE, DIMENSION(:, :), PUBLIC, SAVE :: dt_ekman |
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| 37 | !$OMP THREADPRIVATE(dt_ekman) |
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| 38 | ! heat flux convergence due to horiz diffusion |
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| 39 | REAL, ALLOCATABLE, DIMENSION(:, :), PUBLIC, SAVE :: dt_hdiff |
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| 40 | !$OMP THREADPRIVATE(dt_hdiff) |
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| 41 | ! heat flux convergence due to GM eddy advection |
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| 42 | REAL, ALLOCATABLE, DIMENSION(:, :), PUBLIC, SAVE :: dt_gm |
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| 43 | !$OMP THREADPRIVATE(dt_gm) |
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| 44 | ! Heat Flux correction |
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| 45 | REAL, ALLOCATABLE, DIMENSION(:, :), PUBLIC, SAVE :: dt_qflux |
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| 46 | !$OMP THREADPRIVATE(dt_qflux) |
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| 47 | ! fraction of ocean covered by sea ice (sic / (oce+sic)) |
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| 48 | REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: fsic |
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| 49 | !$OMP THREADPRIVATE(fsic) |
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| 50 | ! temperature of the sea ice |
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| 51 | REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: tice |
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| 52 | !$OMP THREADPRIVATE(tice) |
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| 53 | ! sea ice thickness, in kg/m2 |
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| 54 | REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: seaice |
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| 55 | !$OMP THREADPRIVATE(seaice) |
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| 56 | ! net surface heat flux, weighted by open ocean fraction |
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| 57 | ! slab_bils accumulated over cpl_pas timesteps |
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| 58 | REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: bils_cum |
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| 59 | !$OMP THREADPRIVATE(bils_cum) |
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| 60 | ! net heat flux into the ocean below the ice : conduction + solar radiation |
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| 61 | REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: slab_bilg |
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| 62 | !$OMP THREADPRIVATE(slab_bilg) |
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| 63 | ! slab_bilg over cpl_pas timesteps |
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| 64 | REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: bilg_cum |
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| 65 | !$OMP THREADPRIVATE(bilg_cum) |
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| 66 | ! wind stress saved over cpl_pas timesteps |
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| 67 | REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: taux_cum |
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| 68 | !$OMP THREADPRIVATE(taux_cum) |
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| 69 | REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: tauy_cum |
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| 70 | !$OMP THREADPRIVATE(tauy_cum) |
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| 71 | |
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| 72 | !*********************************************************************************** |
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| 73 | ! Parameters (could be read in def file: move to slab_init) |
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| 74 | !*********************************************************************************** |
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| 75 | ! snow and ice physical characteristics: |
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| 76 | REAL, PARAMETER :: t_freeze = 271.35 ! freezing sea water temp |
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| 77 | REAL, PARAMETER :: t_melt = 273.15 ! melting ice temp |
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| 78 | REAL, PARAMETER :: sno_den = 300. !mean snow density, kg/m3 |
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| 79 | REAL, PARAMETER :: ice_den = 917. ! ice density |
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| 80 | REAL, PARAMETER :: sea_den = 1025. ! sea water density |
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| 81 | REAL, PARAMETER :: ice_cond = 2.17 * ice_den !conductivity of ice |
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| 82 | REAL, PARAMETER :: sno_cond = 0.31 * sno_den ! conductivity of snow |
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| 83 | REAL, PARAMETER :: ice_cap = 2067. ! specific heat capacity, snow and ice |
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| 84 | REAL, PARAMETER :: sea_cap = 3995. ! specific heat capacity, snow and ice |
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| 85 | REAL, PARAMETER :: ice_lat = 334000. ! freeze /melt latent heat snow and ice |
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| 86 | |
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| 87 | ! control of snow and ice cover & freeze / melt (heights converted to kg/m2) |
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| 88 | REAL, PARAMETER :: snow_min = 0.05 * sno_den !critical snow height 5 cm |
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| 89 | REAL, PARAMETER :: snow_wfact = 0.4 ! max fraction of falling snow blown into ocean |
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| 90 | REAL, PARAMETER :: ice_frac_min = 0.001 |
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| 91 | REAL, PARAMETER :: ice_frac_max = 1. ! less than 1. if min leads fraction |
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| 92 | REAL, PARAMETER :: h_ice_min = 0.01 * ice_den ! min ice thickness |
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| 93 | REAL, PARAMETER :: h_ice_thin = 0.15 * ice_den ! thin ice thickness |
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| 94 | ! below ice_thin, priority is melt lateral / grow height |
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| 95 | ! ice_thin is also height of new ice |
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| 96 | REAL, PARAMETER :: h_ice_thick = 2.5 * ice_den ! thin ice thickness |
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| 97 | ! above ice_thick, priority is melt height / grow lateral |
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| 98 | REAL, PARAMETER :: h_ice_new = 1. * ice_den ! max height of new open ocean ice |
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| 99 | REAL, PARAMETER :: h_ice_max = 10. * ice_den ! max ice height |
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| 100 | |
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| 101 | ! albedo and radiation parameters |
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| 102 | REAL, PARAMETER :: alb_sno_min = 0.55 !min snow albedo |
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| 103 | REAL, PARAMETER :: alb_sno_del = 0.3 !max snow albedo = min + del |
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| 104 | REAL, PARAMETER :: alb_ice_dry = 0.75 !dry thick ice |
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| 105 | REAL, PARAMETER :: alb_ice_wet = 0.66 !melting thick ice |
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| 106 | REAL, PARAMETER :: pen_frac = 0.3 !fraction of shortwave penetrating into the |
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| 107 | ! ice (no snow) |
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| 108 | REAL, PARAMETER :: pen_ext = 1.5 !extinction of penetrating shortwave (m-1) |
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| 109 | |
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| 110 | ! horizontal transport |
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| 111 | LOGICAL, PUBLIC, SAVE :: slab_hdiff |
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| 112 | !$OMP THREADPRIVATE(slab_hdiff) |
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| 113 | LOGICAL, PUBLIC, SAVE :: slab_gm |
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| 114 | !$OMP THREADPRIVATE(slab_gm) |
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| 115 | REAL, PRIVATE, SAVE :: coef_hdiff ! coefficient for horizontal diffusion |
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| 116 | !$OMP THREADPRIVATE(coef_hdiff) |
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| 117 | INTEGER, PUBLIC, SAVE :: slab_ekman, slab_cadj ! Ekman, conv adjustment |
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| 118 | !$OMP THREADPRIVATE(slab_ekman) |
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| 119 | !$OMP THREADPRIVATE(slab_cadj) |
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| 120 | |
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| 121 | !*********************************************************************************** |
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| 122 | |
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| 123 | CONTAINS |
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| 124 | |
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| 125 | !*********************************************************************************** |
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| 126 | |
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| 127 | SUBROUTINE ocean_slab_init(dtime, pctsrf_rst) |
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| 128 | !, seaice_rst etc |
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| 129 | |
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| 130 | USE lmdz_ioipsl_getin_p, ONLY: getin_p |
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| 131 | USE lmdz_phys_transfert_para, ONLY: gather |
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| 132 | USE slab_heat_transp_mod, ONLY: ini_slab_transp |
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| 133 | |
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| 134 | ! Input variables |
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| 135 | !*********************************************************************************** |
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| 136 | REAL, INTENT(IN) :: dtime |
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| 137 | ! Variables read from restart file |
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| 138 | REAL, DIMENSION(klon, nbsrf), INTENT(IN) :: pctsrf_rst |
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| 139 | ! surface fractions from start file |
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| 140 | |
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| 141 | ! Local variables |
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| 142 | !************************************************************************************ |
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| 143 | INTEGER :: error |
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| 144 | REAL, DIMENSION(klon_glo) :: zmasq_glo |
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| 145 | CHARACTER (len = 80) :: abort_message |
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| 146 | CHARACTER (len = 20) :: modname = 'ocean_slab_intit' |
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| 147 | |
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| 148 | !*********************************************************************************** |
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| 149 | ! Define some parameters |
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| 150 | !*********************************************************************************** |
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| 151 | ! Number of slab layers |
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| 152 | nslay = 2 |
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| 153 | CALL getin_p('slab_layers', nslay) |
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| 154 | print *, 'number of slab layers : ', nslay |
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| 155 | ! Layer thickness |
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| 156 | ALLOCATE(slabh(nslay), stat = error) |
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| 157 | IF (error /= 0) THEN |
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| 158 | abort_message = 'Pb allocation slabh' |
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| 159 | CALL abort_physic(modname, abort_message, 1) |
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| 160 | ENDIF |
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| 161 | slabh(1) = 50. |
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| 162 | CALL getin_p('slab_depth', slabh(1)) |
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| 163 | IF (nslay>1) THEN |
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| 164 | slabh(2) = 150. |
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| 165 | END IF |
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| 166 | |
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| 167 | ! cyang = 1/heat capacity of top layer (rho.c.H) |
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| 168 | cyang = 1 / (slabh(1) * sea_den * sea_cap) |
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| 169 | |
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| 170 | ! cpl_pas coupling period (update of tslab and ice fraction) |
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| 171 | ! pour un calcul a chaque pas de temps, cpl_pas=1 |
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| 172 | cpl_pas = NINT(86400. / dtime * 1.0) ! une fois par jour |
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| 173 | CALL getin_p('cpl_pas', cpl_pas) |
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| 174 | print *, 'cpl_pas', cpl_pas |
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| 175 | |
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| 176 | ! Horizontal diffusion |
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| 177 | slab_hdiff = .FALSE. |
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| 178 | CALL getin_p('slab_hdiff', slab_hdiff) |
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| 179 | coef_hdiff = 25000. |
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| 180 | CALL getin_p('coef_hdiff', coef_hdiff) |
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| 181 | ! Ekman transport |
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| 182 | slab_ekman = 0 |
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| 183 | CALL getin_p('slab_ekman', slab_ekman) |
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| 184 | ! GM eddy advection (2-layers only) |
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| 185 | slab_gm = .FALSE. |
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| 186 | CALL getin_p('slab_gm', slab_gm) |
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| 187 | IF (slab_ekman<2) THEN |
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| 188 | slab_gm = .FALSE. |
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| 189 | ENDIF |
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| 190 | ! Convective adjustment |
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| 191 | IF (nslay==1) THEN |
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| 192 | slab_cadj = 0 |
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| 193 | ELSE |
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| 194 | slab_cadj = 1 |
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| 195 | END IF |
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| 196 | CALL getin_p('slab_cadj', slab_cadj) |
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| 197 | |
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| 198 | !************************************************************************************ |
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| 199 | ! Allocate surface fraction read from restart file |
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| 200 | !************************************************************************************ |
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| 201 | ALLOCATE(fsic(klon), stat = error) |
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| 202 | IF (error /= 0) THEN |
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| 203 | abort_message = 'Pb allocation tmp_pctsrf_slab' |
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| 204 | CALL abort_physic(modname, abort_message, 1) |
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| 205 | ENDIF |
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| 206 | fsic(:) = 0. |
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| 207 | !zmasq = continent fraction |
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| 208 | WHERE (1. - zmasq(:)>EPSFRA) |
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| 209 | fsic(:) = pctsrf_rst(:, is_sic) / (1. - zmasq(:)) |
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| 210 | END WHERE |
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| 211 | |
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| 212 | !************************************************************************************ |
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| 213 | ! Allocate saved fields |
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| 214 | !************************************************************************************ |
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| 215 | ALLOCATE(tslab(klon, nslay), stat = error) |
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| 216 | IF (error /= 0) CALL abort_physic & |
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| 217 | (modname, 'pb allocation tslab', 1) |
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| 218 | |
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| 219 | ALLOCATE(bils_cum(klon), stat = error) |
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| 220 | IF (error /= 0) THEN |
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| 221 | abort_message = 'Pb allocation slab_bils_cum' |
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| 222 | CALL abort_physic(modname, abort_message, 1) |
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| 223 | ENDIF |
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| 224 | bils_cum(:) = 0.0 |
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| 225 | |
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| 226 | IF (version_ocean=='sicINT') THEN ! interactive sea ice |
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| 227 | ALLOCATE(slab_bilg(klon), stat = error) |
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| 228 | IF (error /= 0) THEN |
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| 229 | abort_message = 'Pb allocation slab_bilg' |
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| 230 | CALL abort_physic(modname, abort_message, 1) |
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| 231 | ENDIF |
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| 232 | slab_bilg(:) = 0.0 |
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| 233 | ALLOCATE(bilg_cum(klon), stat = error) |
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| 234 | IF (error /= 0) THEN |
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| 235 | abort_message = 'Pb allocation slab_bilg_cum' |
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| 236 | CALL abort_physic(modname, abort_message, 1) |
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| 237 | ENDIF |
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| 238 | bilg_cum(:) = 0.0 |
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| 239 | ALLOCATE(tice(klon), stat = error) |
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| 240 | IF (error /= 0) THEN |
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| 241 | abort_message = 'Pb allocation slab_tice' |
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| 242 | CALL abort_physic(modname, abort_message, 1) |
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| 243 | ENDIF |
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| 244 | ALLOCATE(seaice(klon), stat = error) |
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| 245 | IF (error /= 0) THEN |
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| 246 | abort_message = 'Pb allocation slab_seaice' |
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| 247 | CALL abort_physic(modname, abort_message, 1) |
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| 248 | ENDIF |
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| 249 | END IF |
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| 250 | |
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| 251 | IF (slab_hdiff) THEN !horizontal diffusion |
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| 252 | ALLOCATE(dt_hdiff(klon, nslay), stat = error) |
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| 253 | IF (error /= 0) THEN |
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| 254 | abort_message = 'Pb allocation dt_hdiff' |
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| 255 | CALL abort_physic(modname, abort_message, 1) |
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| 256 | ENDIF |
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| 257 | dt_hdiff(:, :) = 0.0 |
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| 258 | ENDIF |
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| 259 | |
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| 260 | ALLOCATE(dt_qflux(klon, nslay), stat = error) |
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| 261 | IF (error /= 0) THEN |
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| 262 | abort_message = 'Pb allocation dt_qflux' |
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| 263 | CALL abort_physic(modname, abort_message, 1) |
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| 264 | ENDIF |
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| 265 | dt_qflux(:, :) = 0.0 |
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| 266 | |
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| 267 | IF (slab_gm) THEN !GM advection |
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| 268 | ALLOCATE(dt_gm(klon, nslay), stat = error) |
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| 269 | IF (error /= 0) THEN |
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| 270 | abort_message = 'Pb allocation dt_gm' |
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| 271 | CALL abort_physic(modname, abort_message, 1) |
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| 272 | ENDIF |
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| 273 | dt_gm(:, :) = 0.0 |
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| 274 | ENDIF |
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| 275 | |
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| 276 | IF (slab_ekman>0) THEN ! ekman transport |
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| 277 | ALLOCATE(dt_ekman(klon, nslay), stat = error) |
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| 278 | IF (error /= 0) THEN |
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| 279 | abort_message = 'Pb allocation dt_ekman' |
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| 280 | CALL abort_physic(modname, abort_message, 1) |
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| 281 | ENDIF |
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| 282 | dt_ekman(:, :) = 0.0 |
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| 283 | ALLOCATE(taux_cum(klon), stat = error) |
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| 284 | IF (error /= 0) THEN |
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| 285 | abort_message = 'Pb allocation taux_cum' |
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| 286 | CALL abort_physic(modname, abort_message, 1) |
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| 287 | ENDIF |
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| 288 | taux_cum(:) = 0.0 |
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| 289 | ALLOCATE(tauy_cum(klon), stat = error) |
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| 290 | IF (error /= 0) THEN |
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| 291 | abort_message = 'Pb allocation tauy_cum' |
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| 292 | CALL abort_physic(modname, abort_message, 1) |
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| 293 | ENDIF |
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| 294 | tauy_cum(:) = 0.0 |
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| 295 | ENDIF |
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| 296 | |
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| 297 | ! Initialize transport |
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| 298 | IF (slab_hdiff.OR.(slab_ekman>0)) THEN |
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| 299 | CALL gather(zmasq, zmasq_glo) |
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| 300 | ! Master thread/process only |
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| 301 | !$OMP MASTER |
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| 302 | IF (is_mpi_root) THEN |
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| 303 | CALL ini_slab_transp(zmasq_glo) |
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| 304 | END IF |
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| 305 | !$OMP END MASTER |
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| 306 | END IF |
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| 307 | |
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| 308 | END SUBROUTINE ocean_slab_init |
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| 309 | |
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| 310 | !*********************************************************************************** |
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| 311 | |
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| 312 | SUBROUTINE ocean_slab_frac(itime, dtime, jour, pctsrf_chg, is_modified) |
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| 313 | |
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| 314 | ! this routine sends back the sea ice and ocean fraction to the main physics |
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| 315 | ! routine. Called only with interactive sea ice |
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| 316 | |
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| 317 | ! Arguments |
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| 318 | !************************************************************************************ |
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| 319 | INTEGER, INTENT(IN) :: itime ! current timestep |
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| 320 | INTEGER, INTENT(IN) :: jour ! day in year (not |
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| 321 | REAL, INTENT(IN) :: dtime ! physics timestep (s) |
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| 322 | REAL, DIMENSION(klon, nbsrf), INTENT(INOUT) :: pctsrf_chg ! sub-surface fraction |
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| 323 | LOGICAL, INTENT(OUT) :: is_modified ! true if pctsrf is |
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| 324 | ! modified at this time step |
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| 325 | |
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| 326 | pctsrf_chg(:, is_oce) = (1. - fsic(:)) * (1. - zmasq(:)) |
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| 327 | pctsrf_chg(:, is_sic) = fsic(:) * (1. - zmasq(:)) |
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| 328 | is_modified = .TRUE. |
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| 329 | |
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| 330 | END SUBROUTINE ocean_slab_frac |
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| 331 | |
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| 332 | !************************************************************************************ |
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| 333 | |
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| 334 | SUBROUTINE ocean_slab_noice(& |
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| 335 | itime, dtime, jour, knon, knindex, & |
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| 336 | p1lay, cdragh, cdragq, cdragm, precip_rain, precip_snow, temp_air, spechum, & |
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| 337 | AcoefH, AcoefQ, BcoefH, BcoefQ, & |
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| 338 | AcoefU, AcoefV, BcoefU, BcoefV, & |
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| 339 | ps, u1, v1, gustiness, tsurf_in, & |
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| 340 | radsol, snow, & |
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| 341 | qsurf, evap, fluxsens, fluxlat, flux_u1, flux_v1, & |
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| 342 | tsurf_new, dflux_s, dflux_l, slab_bils) |
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| 343 | |
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| 344 | USE calcul_fluxs_mod |
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| 345 | USE slab_heat_transp_mod, ONLY: divgrad_phy, slab_ekman1, slab_ekman2, slab_gmdiff |
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| 346 | USE lmdz_phys_para |
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| 347 | USE lmdz_clesphys |
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| 348 | |
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| 349 | ! This routine |
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| 350 | ! (1) computes surface turbulent fluxes over points with some open ocean |
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| 351 | ! (2) reads additional Q-flux (everywhere) |
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| 352 | ! (3) computes horizontal transport (diffusion & Ekman) |
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| 353 | ! (4) updates slab temperature every cpl_pas ; creates new ice if needed. |
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| 354 | |
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| 355 | ! Note : |
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| 356 | ! klon total number of points |
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| 357 | ! knon number of points with open ocean (varies with time) |
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| 358 | ! knindex gives position of the knon points within klon. |
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| 359 | ! In general, local saved variables have klon values |
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| 360 | ! variables exchanged with PBL module have knon. |
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| 361 | |
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| 362 | ! Input arguments |
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| 363 | !*********************************************************************************** |
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| 364 | INTEGER, INTENT(IN) :: itime ! current timestep INTEGER, |
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| 365 | INTEGER, INTENT(IN) :: jour ! day in year (for Q-Flux) |
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| 366 | INTEGER, INTENT(IN) :: knon ! number of points |
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| 367 | INTEGER, DIMENSION(klon), INTENT(IN) :: knindex |
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| 368 | REAL, INTENT(IN) :: dtime ! timestep (s) |
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| 369 | REAL, DIMENSION(klon), INTENT(IN) :: p1lay |
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| 370 | REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragq, cdragm |
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| 371 | ! drag coefficients |
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| 372 | REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow |
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| 373 | REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum ! near surface T, q |
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| 374 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ, BcoefH, BcoefQ |
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| 375 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV |
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| 376 | ! exchange coefficients for boundary layer scheme |
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| 377 | REAL, DIMENSION(klon), INTENT(IN) :: ps ! surface pressure |
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| 378 | REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness ! surface wind |
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| 379 | REAL, DIMENSION(klon), INTENT(IN) :: tsurf_in ! surface temperature |
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| 380 | REAL, DIMENSION(klon), INTENT(INOUT) :: radsol ! net surface radiative flux |
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| 381 | |
|---|
| 382 | ! In/Output arguments |
|---|
| 383 | !************************************************************************************ |
|---|
| 384 | REAL, DIMENSION(klon), INTENT(INOUT) :: snow ! in kg/m2 |
|---|
| 385 | |
|---|
| 386 | ! Output arguments |
|---|
| 387 | !************************************************************************************ |
|---|
| 388 | REAL, DIMENSION(klon), INTENT(OUT) :: qsurf |
|---|
| 389 | REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat |
|---|
| 390 | REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1 |
|---|
| 391 | REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new ! new surface tempearture |
|---|
| 392 | REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l |
|---|
| 393 | REAL, DIMENSION(klon), INTENT(OUT) :: slab_bils |
|---|
| 394 | |
|---|
| 395 | ! Local variables |
|---|
| 396 | !************************************************************************************ |
|---|
| 397 | INTEGER :: i, ki, k |
|---|
| 398 | REAL :: t_cadj |
|---|
| 399 | ! for surface heat fluxes |
|---|
| 400 | REAL, DIMENSION(klon) :: cal, beta, dif_grnd |
|---|
| 401 | ! for Q-Flux computation: d/dt SST, d/dt ice volume (kg/m2), surf fluxes |
|---|
| 402 | REAL, DIMENSION(klon) :: diff_sst, diff_siv |
|---|
| 403 | REAL, DIMENSION(klon, nslay) :: lmt_bils |
|---|
| 404 | ! for surface wind stress |
|---|
| 405 | REAL, DIMENSION(klon) :: u0, v0 |
|---|
| 406 | REAL, DIMENSION(klon) :: u1_lay, v1_lay |
|---|
| 407 | ! for new ice creation |
|---|
| 408 | REAL :: e_freeze, h_new, dfsic |
|---|
| 409 | ! horizontal diffusion and Ekman local vars |
|---|
| 410 | ! dimension = global domain (klon_glo) instead of // subdomains |
|---|
| 411 | REAL, DIMENSION(klon_glo, nslay) :: dt_hdiff_glo, dt_ekman_glo, dt_gm_glo |
|---|
| 412 | ! dt_ekman_glo saved for diagnostic, dt_ekman_tmp used for time loop |
|---|
| 413 | REAL, DIMENSION(klon_glo, nslay) :: dt_hdiff_tmp, dt_ekman_tmp |
|---|
| 414 | REAL, DIMENSION(klon_glo, nslay) :: tslab_glo |
|---|
| 415 | REAL, DIMENSION(klon_glo) :: taux_glo, tauy_glo |
|---|
| 416 | |
|---|
| 417 | !**************************************************************************************** |
|---|
| 418 | ! 1) Surface fluxes calculation |
|---|
| 419 | |
|---|
| 420 | !**************************************************************************************** |
|---|
| 421 | !cal(:) = 0. ! infinite thermal inertia |
|---|
| 422 | !beta(:) = 1. ! wet surface |
|---|
| 423 | !dif_grnd(:) = 0. ! no diffusion into ground |
|---|
| 424 | ! EV: use calbeta |
|---|
| 425 | CALL calbeta(dtime, is_oce, knon, snow, qsurf, beta, cal, dif_grnd) |
|---|
| 426 | |
|---|
| 427 | |
|---|
| 428 | |
|---|
| 429 | ! Suppose zero surface speed |
|---|
| 430 | u0(:) = 0.0 |
|---|
| 431 | v0(:) = 0.0 |
|---|
| 432 | u1_lay(:) = u1(:) - u0(:) |
|---|
| 433 | v1_lay(:) = v1(:) - v0(:) |
|---|
| 434 | |
|---|
| 435 | ! Compute latent & sensible fluxes |
|---|
| 436 | CALL calcul_fluxs(knon, is_oce, dtime, & |
|---|
| 437 | tsurf_in, p1lay, cal, beta, cdragh, cdragq, ps, & |
|---|
| 438 | precip_rain, precip_snow, snow, qsurf, & |
|---|
| 439 | radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, & |
|---|
| 440 | f_qsat_oce, AcoefH, AcoefQ, BcoefH, BcoefQ, & |
|---|
| 441 | tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l) |
|---|
| 442 | |
|---|
| 443 | ! save total cumulated heat fluxes locally |
|---|
| 444 | ! radiative + turbulent + melt of falling snow |
|---|
| 445 | slab_bils(:) = 0. |
|---|
| 446 | DO i = 1, knon |
|---|
| 447 | ki = knindex(i) |
|---|
| 448 | slab_bils(ki) = (1. - fsic(ki)) * (fluxlat(i) + fluxsens(i) + radsol(i) & |
|---|
| 449 | - precip_snow(i) * ice_lat * (1. + snow_wfact * fsic(ki))) |
|---|
| 450 | bils_cum(ki) = bils_cum(ki) + slab_bils(ki) |
|---|
| 451 | END DO |
|---|
| 452 | |
|---|
| 453 | ! Compute surface wind stress |
|---|
| 454 | CALL calcul_flux_wind(knon, dtime, & |
|---|
| 455 | u0, v0, u1, v1, gustiness, cdragm, & |
|---|
| 456 | AcoefU, AcoefV, BcoefU, BcoefV, & |
|---|
| 457 | p1lay, temp_air, & |
|---|
| 458 | flux_u1, flux_v1) |
|---|
| 459 | |
|---|
| 460 | ! save cumulated wind stress |
|---|
| 461 | IF (slab_ekman>0) THEN |
|---|
| 462 | DO i = 1, knon |
|---|
| 463 | ki = knindex(i) |
|---|
| 464 | taux_cum(ki) = taux_cum(ki) + flux_u1(i) * (1. - fsic(ki)) / cpl_pas |
|---|
| 465 | tauy_cum(ki) = tauy_cum(ki) + flux_v1(i) * (1. - fsic(ki)) / cpl_pas |
|---|
| 466 | END DO |
|---|
| 467 | ENDIF |
|---|
| 468 | |
|---|
| 469 | !**************************************************************************************** |
|---|
| 470 | ! 2) Q-Flux : get global variables lmt_bils, diff_sst and diff_siv from file limit_slab.nc |
|---|
| 471 | |
|---|
| 472 | !**************************************************************************************** |
|---|
| 473 | CALL limit_slab(itime, dtime, jour, lmt_bils, diff_sst, diff_siv) |
|---|
| 474 | ! lmt_bils and diff_sst,siv saved by limit_slab |
|---|
| 475 | ! qflux = total QFlux correction (in W/m2) |
|---|
| 476 | dt_qflux(:, 1) = lmt_bils(:, 1) + diff_sst(:) / cyang / 86400. - diff_siv(:) * ice_den * ice_lat / 86400. |
|---|
| 477 | IF (nslay>1) THEN |
|---|
| 478 | dt_qflux(:, 2:nslay) = lmt_bils(:, 2:nslay) |
|---|
| 479 | END IF |
|---|
| 480 | |
|---|
| 481 | !**************************************************************************************** |
|---|
| 482 | ! 3) Recalculate new temperature (add Surf fluxes, Q-Flux, Ocean transport) |
|---|
| 483 | ! Bring to freezing temp and make sea ice if necessary |
|---|
| 484 | |
|---|
| 485 | !***********************************************o***************************************** |
|---|
| 486 | tsurf_new = tsurf_in |
|---|
| 487 | IF (MOD(itime, cpl_pas)==0) THEN ! time to update tslab & fraction |
|---|
| 488 | ! *********************************** |
|---|
| 489 | ! Horizontal transport |
|---|
| 490 | ! *********************************** |
|---|
| 491 | IF (slab_ekman>0) THEN |
|---|
| 492 | ! copy wind stress to global var |
|---|
| 493 | CALL gather(taux_cum, taux_glo) |
|---|
| 494 | CALL gather(tauy_cum, tauy_glo) |
|---|
| 495 | END IF |
|---|
| 496 | |
|---|
| 497 | IF (slab_hdiff.OR.(slab_ekman>0)) THEN |
|---|
| 498 | CALL gather(tslab, tslab_glo) |
|---|
| 499 | ! Compute horiz transport on one process only |
|---|
| 500 | IF (is_mpi_root .AND. is_omp_root) THEN ! Only master processus |
|---|
| 501 | IF (slab_hdiff) THEN |
|---|
| 502 | dt_hdiff_glo(:, :) = 0. |
|---|
| 503 | END IF |
|---|
| 504 | IF (slab_ekman>0) THEN |
|---|
| 505 | dt_ekman_glo(:, :) = 0. |
|---|
| 506 | END IF |
|---|
| 507 | IF (slab_gm) THEN |
|---|
| 508 | dt_gm_glo(:, :) = 0. |
|---|
| 509 | END IF |
|---|
| 510 | DO i = 1, cpl_pas ! time splitting for numerical stability |
|---|
| 511 | IF (slab_ekman>0) THEN |
|---|
| 512 | SELECT CASE (slab_ekman) |
|---|
| 513 | CASE (1) |
|---|
| 514 | CALL slab_ekman1(taux_glo, tauy_glo, tslab_glo, dt_ekman_tmp) |
|---|
| 515 | CASE (2) |
|---|
| 516 | CALL slab_ekman2(taux_glo, tauy_glo, tslab_glo, dt_ekman_tmp, dt_hdiff_tmp, slab_gm) |
|---|
| 517 | CASE DEFAULT |
|---|
| 518 | dt_ekman_tmp(:, :) = 0. |
|---|
| 519 | END SELECT |
|---|
| 520 | dt_ekman_glo(:, :) = dt_ekman_glo(:, :) + dt_ekman_tmp(:, :) |
|---|
| 521 | ! convert dt_ekman from K.s-1.(kg.m-2) to K.s-1 |
|---|
| 522 | DO k = 1, nslay |
|---|
| 523 | dt_ekman_tmp(:, k) = dt_ekman_tmp(:, k) / (slabh(k) * sea_den) |
|---|
| 524 | ENDDO |
|---|
| 525 | tslab_glo = tslab_glo + dt_ekman_tmp * dtime |
|---|
| 526 | IF (slab_gm) THEN ! Gent-McWilliams eddy advection |
|---|
| 527 | dt_gm_glo(:, :) = dt_gm_glo(:, :) + dt_hdiff_tmp(:, :) |
|---|
| 528 | ! convert dt from K.s-1.(kg.m-2) to K.s-1 |
|---|
| 529 | DO k = 1, nslay |
|---|
| 530 | dt_hdiff_tmp(:, k) = dt_hdiff_tmp(:, k) / (slabh(k) * sea_den) |
|---|
| 531 | END DO |
|---|
| 532 | tslab_glo = tslab_glo + dt_hdiff_tmp * dtime |
|---|
| 533 | END IF |
|---|
| 534 | ENDIF |
|---|
| 535 | ! GM included in Ekman_2 |
|---|
| 536 | ! IF (slab_gm) THEN ! Gent-McWilliams eddy advection |
|---|
| 537 | ! CALL slab_gmdiff(tslab_glo,dt_hdiff_tmp) |
|---|
| 538 | ! ! convert dt_gm from K.m.s-1 to K.s-1 |
|---|
| 539 | ! DO k=1,nslay |
|---|
| 540 | ! dt_hdiff_tmp(:,k)=dt_hdiff_tmp(:,k)/slabh(k) |
|---|
| 541 | ! END DO |
|---|
| 542 | ! tslab_glo=tslab_glo+dt_hdiff_tmp*dtime |
|---|
| 543 | ! dt_gm_glo(:,:)=dt_gm_glo(:,:)+ dt_hdiff_tmp(:,:) |
|---|
| 544 | ! END IF |
|---|
| 545 | IF (slab_hdiff) THEN ! horizontal diffusion |
|---|
| 546 | ! laplacian of slab T |
|---|
| 547 | CALL divgrad_phy(nslay, tslab_glo, dt_hdiff_tmp) |
|---|
| 548 | ! multiply by diff coef and normalize to 50m slab equivalent |
|---|
| 549 | dt_hdiff_tmp = dt_hdiff_tmp * coef_hdiff * 50. / SUM(slabh) |
|---|
| 550 | dt_hdiff_glo(:, :) = dt_hdiff_glo(:, :) + dt_hdiff_tmp(:, :) |
|---|
| 551 | tslab_glo = tslab_glo + dt_hdiff_tmp * dtime |
|---|
| 552 | END IF |
|---|
| 553 | END DO ! time splitting |
|---|
| 554 | IF (slab_hdiff) THEN |
|---|
| 555 | !dt_hdiff_glo saved in W/m2 |
|---|
| 556 | DO k = 1, nslay |
|---|
| 557 | dt_hdiff_glo(:, k) = dt_hdiff_glo(:, k) * slabh(k) * sea_den * sea_cap / cpl_pas |
|---|
| 558 | END DO |
|---|
| 559 | END IF |
|---|
| 560 | IF (slab_gm) THEN |
|---|
| 561 | !dt_hdiff_glo saved in W/m2 |
|---|
| 562 | dt_gm_glo(:, :) = dt_gm_glo(:, :) * sea_cap / cpl_pas |
|---|
| 563 | END IF |
|---|
| 564 | IF (slab_ekman>0) THEN |
|---|
| 565 | ! dt_ekman_glo saved in W/m2 |
|---|
| 566 | dt_ekman_glo(:, :) = dt_ekman_glo(:, :) * sea_cap / cpl_pas |
|---|
| 567 | END IF |
|---|
| 568 | END IF ! master process |
|---|
| 569 | !$OMP BARRIER |
|---|
| 570 | ! Send new fields back to all processes |
|---|
| 571 | CALL Scatter(tslab_glo, tslab) |
|---|
| 572 | IF (slab_hdiff) THEN |
|---|
| 573 | CALL Scatter(dt_hdiff_glo, dt_hdiff) |
|---|
| 574 | END IF |
|---|
| 575 | IF (slab_gm) THEN |
|---|
| 576 | CALL Scatter(dt_gm_glo, dt_gm) |
|---|
| 577 | END IF |
|---|
| 578 | IF (slab_ekman>0) THEN |
|---|
| 579 | CALL Scatter(dt_ekman_glo, dt_ekman) |
|---|
| 580 | ! clear wind stress |
|---|
| 581 | taux_cum(:) = 0. |
|---|
| 582 | tauy_cum(:) = 0. |
|---|
| 583 | END IF |
|---|
| 584 | ENDIF ! transport |
|---|
| 585 | |
|---|
| 586 | ! *********************************** |
|---|
| 587 | ! Other heat fluxes |
|---|
| 588 | ! *********************************** |
|---|
| 589 | ! Add read QFlux |
|---|
| 590 | DO k = 1, nslay |
|---|
| 591 | tslab(:, k) = tslab(:, k) + dt_qflux(:, k) * cyang * dtime * cpl_pas & |
|---|
| 592 | * slabh(1) / slabh(k) |
|---|
| 593 | END DO |
|---|
| 594 | ! Add cumulated surface fluxes |
|---|
| 595 | tslab(:, 1) = tslab(:, 1) + bils_cum(:) * cyang * dtime |
|---|
| 596 | ! Convective adjustment if 2 layers |
|---|
| 597 | IF ((nslay>1).AND.(slab_cadj>0)) THEN |
|---|
| 598 | DO i = 1, klon |
|---|
| 599 | IF (tslab(i, 2)>tslab(i, 1)) THEN |
|---|
| 600 | ! mean (mass-weighted) temperature |
|---|
| 601 | t_cadj = SUM(tslab(i, :) * slabh(:)) / SUM(slabh(:)) |
|---|
| 602 | tslab(i, 1) = t_cadj |
|---|
| 603 | tslab(i, 2) = t_cadj |
|---|
| 604 | END IF |
|---|
| 605 | END DO |
|---|
| 606 | END IF |
|---|
| 607 | ! *********************************** |
|---|
| 608 | ! Update surface temperature and ice |
|---|
| 609 | ! *********************************** |
|---|
| 610 | SELECT CASE(version_ocean) |
|---|
| 611 | CASE('sicNO') ! no sea ice even below freezing ! |
|---|
| 612 | DO i = 1, knon |
|---|
| 613 | ki = knindex(i) |
|---|
| 614 | tsurf_new(i) = tslab(ki, 1) |
|---|
| 615 | END DO |
|---|
| 616 | CASE('sicOBS') ! "realistic" case, for prescribed sea ice |
|---|
| 617 | ! tslab cannot be below freezing, or above it if there is sea ice |
|---|
| 618 | DO i = 1, knon |
|---|
| 619 | ki = knindex(i) |
|---|
| 620 | IF ((tslab(ki, 1)<t_freeze).OR.(fsic(ki)>epsfra)) THEN |
|---|
| 621 | tslab(ki, 1) = t_freeze |
|---|
| 622 | END IF |
|---|
| 623 | tsurf_new(i) = tslab(ki, 1) |
|---|
| 624 | END DO |
|---|
| 625 | CASE('sicINT') ! interactive sea ice |
|---|
| 626 | DO i = 1, knon |
|---|
| 627 | ki = knindex(i) |
|---|
| 628 | IF (fsic(ki)<epsfra) THEN ! Free of ice |
|---|
| 629 | IF (tslab(ki, 1)<t_freeze) THEN ! create new ice |
|---|
| 630 | ! quantity of new ice formed |
|---|
| 631 | e_freeze = (t_freeze - tslab(ki, 1)) / cyang / ice_lat |
|---|
| 632 | ! new ice |
|---|
| 633 | tice(ki) = t_freeze |
|---|
| 634 | fsic(ki) = MIN(ice_frac_max, e_freeze / h_ice_thin) |
|---|
| 635 | IF (fsic(ki)>ice_frac_min) THEN |
|---|
| 636 | seaice(ki) = MIN(e_freeze / fsic(ki), h_ice_max) |
|---|
| 637 | tslab(ki, 1) = t_freeze |
|---|
| 638 | ELSE |
|---|
| 639 | fsic(ki) = 0. |
|---|
| 640 | END IF |
|---|
| 641 | tsurf_new(i) = t_freeze |
|---|
| 642 | ELSE |
|---|
| 643 | tsurf_new(i) = tslab(ki, 1) |
|---|
| 644 | END IF |
|---|
| 645 | ELSE ! ice present |
|---|
| 646 | tsurf_new(i) = t_freeze |
|---|
| 647 | IF (tslab(ki, 1)<t_freeze) THEN ! create new ice |
|---|
| 648 | ! quantity of new ice formed over open ocean |
|---|
| 649 | e_freeze = (t_freeze - tslab(ki, 1)) / cyang * (1. - fsic(ki)) & |
|---|
| 650 | / (ice_lat + ice_cap / 2. * (t_freeze - tice(ki))) |
|---|
| 651 | ! new ice height and fraction |
|---|
| 652 | h_new = MIN(h_ice_new, seaice(ki)) ! max new height ice_new |
|---|
| 653 | dfsic = MIN(ice_frac_max - fsic(ki), e_freeze / h_new) |
|---|
| 654 | h_new = MIN(e_freeze / dfsic, h_ice_max) |
|---|
| 655 | ! update tslab to freezing over open ocean only |
|---|
| 656 | tslab(ki, 1) = tslab(ki, 1) * fsic(ki) + t_freeze * (1. - fsic(ki)) |
|---|
| 657 | ! update sea ice |
|---|
| 658 | seaice(ki) = (h_new * dfsic + seaice(ki) * fsic(ki)) & |
|---|
| 659 | / (dfsic + fsic(ki)) |
|---|
| 660 | fsic(ki) = fsic(ki) + dfsic |
|---|
| 661 | ! update snow? |
|---|
| 662 | END IF ! tslab below freezing |
|---|
| 663 | END IF ! sea ice present |
|---|
| 664 | END DO |
|---|
| 665 | END SELECT |
|---|
| 666 | bils_cum(:) = 0.0! clear cumulated fluxes |
|---|
| 667 | END IF ! coupling time |
|---|
| 668 | END SUBROUTINE ocean_slab_noice |
|---|
| 669 | |
|---|
| 670 | !**************************************************************************************** |
|---|
| 671 | |
|---|
| 672 | SUBROUTINE ocean_slab_ice(& |
|---|
| 673 | itime, dtime, jour, knon, knindex, & |
|---|
| 674 | tsurf_in, p1lay, cdragh, cdragm, precip_rain, precip_snow, temp_air, spechum, & |
|---|
| 675 | AcoefH, AcoefQ, BcoefH, BcoefQ, & |
|---|
| 676 | AcoefU, AcoefV, BcoefU, BcoefV, & |
|---|
| 677 | ps, u1, v1, gustiness, & |
|---|
| 678 | radsol, snow, qsurf, qsol, agesno, & |
|---|
| 679 | alb1_new, alb2_new, evap, fluxsens, fluxlat, flux_u1, flux_v1, & |
|---|
| 680 | tsurf_new, dflux_s, dflux_l, swnet) |
|---|
| 681 | |
|---|
| 682 | USE calcul_fluxs_mod |
|---|
| 683 | USE lmdz_clesphys |
|---|
| 684 | USE lmdz_yomcst |
|---|
| 685 | |
|---|
| 686 | IMPLICIT NONE |
|---|
| 687 | |
|---|
| 688 | ! Input arguments |
|---|
| 689 | !**************************************************************************************** |
|---|
| 690 | INTEGER, INTENT(IN) :: itime, jour, knon |
|---|
| 691 | INTEGER, DIMENSION(klon), INTENT(IN) :: knindex |
|---|
| 692 | REAL, INTENT(IN) :: dtime |
|---|
| 693 | REAL, DIMENSION(klon), INTENT(IN) :: tsurf_in |
|---|
| 694 | REAL, DIMENSION(klon), INTENT(IN) :: p1lay |
|---|
| 695 | REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragm |
|---|
| 696 | REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow |
|---|
| 697 | REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum |
|---|
| 698 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ, BcoefH, BcoefQ |
|---|
| 699 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV |
|---|
| 700 | REAL, DIMENSION(klon), INTENT(IN) :: ps |
|---|
| 701 | REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness |
|---|
| 702 | REAL, DIMENSION(klon), INTENT(IN) :: swnet |
|---|
| 703 | |
|---|
| 704 | ! In/Output arguments |
|---|
| 705 | !**************************************************************************************** |
|---|
| 706 | REAL, DIMENSION(klon), INTENT(INOUT) :: snow, qsol |
|---|
| 707 | REAL, DIMENSION(klon), INTENT(INOUT) :: agesno |
|---|
| 708 | REAL, DIMENSION(klon), INTENT(INOUT) :: radsol |
|---|
| 709 | |
|---|
| 710 | ! Output arguments |
|---|
| 711 | !**************************************************************************************** |
|---|
| 712 | REAL, DIMENSION(klon), INTENT(OUT) :: qsurf |
|---|
| 713 | REAL, DIMENSION(klon), INTENT(OUT) :: alb1_new ! new albedo in visible SW interval |
|---|
| 714 | REAL, DIMENSION(klon), INTENT(OUT) :: alb2_new ! new albedo in near IR interval |
|---|
| 715 | REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat |
|---|
| 716 | REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1 |
|---|
| 717 | REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new |
|---|
| 718 | REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l |
|---|
| 719 | |
|---|
| 720 | ! Local variables |
|---|
| 721 | !**************************************************************************************** |
|---|
| 722 | INTEGER :: i, ki |
|---|
| 723 | REAL, DIMENSION(klon) :: cal, beta, dif_grnd |
|---|
| 724 | REAL, DIMENSION(klon) :: u0, v0 |
|---|
| 725 | REAL, DIMENSION(klon) :: u1_lay, v1_lay |
|---|
| 726 | ! intermediate heat fluxes: |
|---|
| 727 | REAL :: f_cond, f_swpen |
|---|
| 728 | ! for snow/ice albedo: |
|---|
| 729 | REAL :: alb_snow, alb_ice, alb_pond |
|---|
| 730 | REAL :: frac_snow, frac_ice, frac_pond |
|---|
| 731 | ! for ice melt / freeze |
|---|
| 732 | REAL :: e_melt, snow_evap, h_test |
|---|
| 733 | ! dhsic, dfsic change in ice mass, fraction. |
|---|
| 734 | REAL :: dhsic, dfsic, frac_mf |
|---|
| 735 | |
|---|
| 736 | !**************************************************************************************** |
|---|
| 737 | ! 1) Flux calculation |
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| 738 | !**************************************************************************************** |
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| 739 | ! Suppose zero surface speed |
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| 740 | u0(:) = 0.0 |
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| 741 | v0(:) = 0.0 |
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| 742 | u1_lay(:) = u1(:) - u0(:) |
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| 743 | v1_lay(:) = v1(:) - v0(:) |
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| 744 | |
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| 745 | ! set beta, cal, compute conduction fluxes inside ice/snow |
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| 746 | slab_bilg(:) = 0. |
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| 747 | !dif_grnd(:)=0. |
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| 748 | !beta(:) = 1. |
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| 749 | ! EV: use calbeta to calculate beta and then recalculate properly cal |
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| 750 | CALL calbeta(dtime, is_sic, knon, snow, qsol, beta, cal, dif_grnd) |
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| 751 | |
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| 752 | DO i = 1, knon |
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| 753 | ki = knindex(i) |
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| 754 | IF (snow(i)>snow_min) THEN |
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| 755 | ! snow-layer heat capacity |
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| 756 | cal(i) = 2. * RCPD / (snow(i) * ice_cap) |
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| 757 | ! snow conductive flux |
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| 758 | f_cond = sno_cond * (tice(ki) - tsurf_in(i)) / snow(i) |
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| 759 | ! all shortwave flux absorbed |
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| 760 | f_swpen = 0. |
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| 761 | ! bottom flux (ice conduction) |
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| 762 | slab_bilg(ki) = ice_cond * (tice(ki) - t_freeze) / seaice(ki) |
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| 763 | ! update ice temperature |
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| 764 | tice(ki) = tice(ki) - 2. / ice_cap / (snow(i) + seaice(ki)) & |
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| 765 | * (slab_bilg(ki) + f_cond) * dtime |
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| 766 | ELSE ! bare ice |
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| 767 | ! ice-layer heat capacity |
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| 768 | cal(i) = 2. * RCPD / (seaice(ki) * ice_cap) |
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| 769 | ! conductive flux |
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| 770 | f_cond = ice_cond * (t_freeze - tice(ki)) / seaice(ki) |
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| 771 | ! penetrative shortwave flux... |
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| 772 | f_swpen = swnet(i) * pen_frac * exp(-pen_ext * seaice(ki) / ice_den) |
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| 773 | slab_bilg(ki) = f_swpen - f_cond |
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| 774 | END IF |
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| 775 | radsol(i) = radsol(i) + f_cond - f_swpen |
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| 776 | END DO |
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| 777 | ! weight fluxes to ocean by sea ice fraction |
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| 778 | slab_bilg(:) = slab_bilg(:) * fsic(:) |
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| 779 | |
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| 780 | ! calcul_fluxs (sens, lat etc) |
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| 781 | CALL calcul_fluxs(knon, is_sic, dtime, & |
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| 782 | tsurf_in, p1lay, cal, beta, cdragh, cdragh, ps, & |
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| 783 | precip_rain, precip_snow, snow, qsurf, & |
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| 784 | radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, & |
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| 785 | f_qsat_oce, AcoefH, AcoefQ, BcoefH, BcoefQ, & |
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| 786 | tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l) |
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| 787 | DO i = 1, knon |
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| 788 | IF (snow(i)<snow_min) tice(knindex(i)) = tsurf_new(i) |
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| 789 | END DO |
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| 790 | |
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| 791 | ! calcul_flux_wind |
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| 792 | CALL calcul_flux_wind(knon, dtime, & |
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| 793 | u0, v0, u1, v1, gustiness, cdragm, & |
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| 794 | AcoefU, AcoefV, BcoefU, BcoefV, & |
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| 795 | p1lay, temp_air, & |
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| 796 | flux_u1, flux_v1) |
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| 797 | |
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| 798 | !**************************************************************************************** |
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| 799 | ! 2) Update snow and ice surface |
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| 800 | !**************************************************************************************** |
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| 801 | ! snow precip |
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| 802 | DO i = 1, knon |
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| 803 | ki = knindex(i) |
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| 804 | IF (precip_snow(i) > 0.) THEN |
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| 805 | snow(i) = snow(i) + precip_snow(i) * dtime * (1. - snow_wfact * (1. - fsic(ki))) |
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| 806 | END IF |
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| 807 | ! snow and ice sublimation |
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| 808 | IF (evap(i) > 0.) THEN |
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| 809 | snow_evap = MIN (snow(i) / dtime, evap(i)) |
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| 810 | snow(i) = snow(i) - snow_evap * dtime |
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| 811 | snow(i) = MAX(0.0, snow(i)) |
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| 812 | seaice(ki) = MAX(0.0, seaice(ki) - (evap(i) - snow_evap) * dtime) |
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| 813 | ENDIF |
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| 814 | ! Melt / Freeze snow from above if Tsurf>0 |
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| 815 | IF (tsurf_new(i)>t_melt) THEN |
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| 816 | ! energy available for melting snow (in kg of melted snow /m2) |
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| 817 | e_melt = MIN(MAX(snow(i) * (tsurf_new(i) - t_melt) * ice_cap / 2. & |
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| 818 | / (ice_lat + ice_cap / 2. * (t_melt - tice(ki))), 0.0), snow(i)) |
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| 819 | ! remove snow |
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| 820 | IF (snow(i)>e_melt) THEN |
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| 821 | snow(i) = snow(i) - e_melt |
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| 822 | tsurf_new(i) = t_melt |
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| 823 | ELSE ! all snow is melted |
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| 824 | ! add remaining heat flux to ice |
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| 825 | e_melt = e_melt - snow(i) |
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| 826 | tice(ki) = tice(ki) + e_melt * ice_lat * 2. / (ice_cap * seaice(ki)) |
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| 827 | tsurf_new(i) = tice(ki) |
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| 828 | END IF |
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| 829 | END IF |
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| 830 | ! melt ice from above if Tice>0 |
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| 831 | IF (tice(ki)>t_melt) THEN |
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| 832 | ! quantity of ice melted (kg/m2) |
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| 833 | e_melt = MAX(seaice(ki) * (tice(ki) - t_melt) * ice_cap / 2. & |
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| 834 | / (ice_lat + ice_cap / 2. * (t_melt - t_freeze)), 0.0) |
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| 835 | ! melt from above, height only |
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| 836 | dhsic = MIN(seaice(ki) - h_ice_min, e_melt) |
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| 837 | e_melt = e_melt - dhsic |
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| 838 | IF (e_melt>0) THEN |
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| 839 | ! lateral melt if ice too thin |
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| 840 | dfsic = MAX(fsic(ki) - ice_frac_min, e_melt / h_ice_min * fsic(ki)) |
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| 841 | ! if all melted add remaining heat to ocean |
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| 842 | e_melt = MAX(0., e_melt * fsic(ki) - dfsic * h_ice_min) |
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| 843 | slab_bilg(ki) = slab_bilg(ki) + e_melt * ice_lat / dtime |
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| 844 | ! update height and fraction |
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| 845 | fsic(ki) = fsic(ki) - dfsic |
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| 846 | END IF |
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| 847 | seaice(ki) = seaice(ki) - dhsic |
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| 848 | ! surface temperature at melting point |
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| 849 | tice(ki) = t_melt |
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| 850 | tsurf_new(i) = t_melt |
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| 851 | END IF |
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| 852 | ! convert snow to ice if below floating line |
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| 853 | h_test = (seaice(ki) + snow(i)) * ice_den - seaice(ki) * sea_den |
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| 854 | IF (h_test>0.) THEN !snow under water |
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| 855 | ! extra snow converted to ice (with added frozen sea water) |
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| 856 | dhsic = h_test / (sea_den - ice_den + sno_den) |
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| 857 | seaice(ki) = seaice(ki) + dhsic |
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| 858 | snow(i) = snow(i) - dhsic * sno_den / ice_den |
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| 859 | ! available energy (freeze sea water + bring to tice) |
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| 860 | e_melt = dhsic * (1. - sno_den / ice_den) * (ice_lat + & |
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| 861 | ice_cap / 2. * (t_freeze - tice(ki))) |
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| 862 | ! update ice temperature |
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| 863 | tice(ki) = tice(ki) + 2. * e_melt / ice_cap / (snow(i) + seaice(ki)) |
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| 864 | END IF |
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| 865 | END DO |
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| 866 | |
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| 867 | ! New albedo |
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| 868 | DO i = 1, knon |
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| 869 | ki = knindex(i) |
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| 870 | ! snow albedo: update snow age |
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| 871 | IF (snow(i)>0.0001) THEN |
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| 872 | agesno(i) = (agesno(i) + (1. - agesno(i) / 50.) * dtime / 86400.)& |
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| 873 | * EXP(-1. * MAX(0.0, precip_snow(i)) * dtime / 5.) |
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| 874 | ELSE |
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| 875 | agesno(i) = 0.0 |
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| 876 | END IF |
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| 877 | ! snow albedo |
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| 878 | alb_snow = alb_sno_min + alb_sno_del * EXP(-agesno(i) / 50.) |
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| 879 | ! ice albedo (varies with ice tkickness and temp) |
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| 880 | alb_ice = MAX(0.0, 0.13 * LOG(100. * seaice(ki) / ice_den) + 0.1) |
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| 881 | IF (tice(ki)>t_freeze - 0.01) THEN |
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| 882 | alb_ice = MIN(alb_ice, alb_ice_wet) |
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| 883 | ELSE |
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| 884 | alb_ice = MIN(alb_ice, alb_ice_dry) |
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| 885 | END IF |
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| 886 | ! pond albedo |
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| 887 | alb_pond = 0.36 - 0.1 * (2.0 + MIN(0.0, MAX(tice(ki) - t_melt, -2.0))) |
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| 888 | ! pond fraction |
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| 889 | frac_pond = 0.2 * (2.0 + MIN(0.0, MAX(tice(ki) - t_melt, -2.0))) |
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| 890 | ! snow fraction |
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| 891 | frac_snow = MAX(0.0, MIN(1.0 - frac_pond, snow(i) / snow_min)) |
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| 892 | ! ice fraction |
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| 893 | frac_ice = MAX(0.0, 1. - frac_pond - frac_snow) |
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| 894 | ! total albedo |
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| 895 | alb1_new(i) = alb_snow * frac_snow + alb_ice * frac_ice + alb_pond * frac_pond |
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| 896 | END DO |
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| 897 | alb2_new(:) = alb1_new(:) |
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| 898 | |
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| 899 | !**************************************************************************************** |
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| 900 | ! 3) Recalculate new ocean temperature (add fluxes below ice) |
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| 901 | ! Melt / freeze from below |
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| 902 | !***********************************************o***************************************** |
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| 903 | !cumul fluxes |
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| 904 | bilg_cum(:) = bilg_cum(:) + slab_bilg(:) |
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| 905 | IF (MOD(itime, cpl_pas)==0) THEN ! time to update tslab & fraction |
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| 906 | ! Add cumulated surface fluxes |
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| 907 | tslab(:, 1) = tslab(:, 1) + bilg_cum(:) * cyang * dtime |
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| 908 | DO i = 1, knon |
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| 909 | ki = knindex(i) |
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| 910 | ! split lateral/top melt-freeze |
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| 911 | frac_mf = MIN(1., MAX(0., (seaice(ki) - h_ice_thin) / (h_ice_thick - h_ice_thin))) |
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| 912 | IF (tslab(ki, 1)<=t_freeze) THEN |
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| 913 | ! ****** Form new ice from below ******* |
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| 914 | ! quantity of new ice |
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| 915 | e_melt = (t_freeze - tslab(ki, 1)) / cyang & |
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| 916 | / (ice_lat + ice_cap / 2. * (t_freeze - tice(ki))) |
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| 917 | ! first increase height to h_thin |
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| 918 | dhsic = MAX(0., MIN(h_ice_thin - seaice(ki), e_melt / fsic(ki))) |
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| 919 | seaice(ki) = dhsic + seaice(ki) |
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| 920 | e_melt = e_melt - fsic(ki) * dhsic |
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| 921 | IF (e_melt>0.) THEN |
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| 922 | ! frac_mf fraction used for lateral increase |
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| 923 | dfsic = MIN(ice_frac_max - fsic(ki), e_melt * frac_mf / seaice(ki)) |
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| 924 | fsic(ki) = fsic(ki) + dfsic |
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| 925 | e_melt = e_melt - dfsic * seaice(ki) |
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| 926 | ! rest used to increase height |
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| 927 | seaice(ki) = MIN(h_ice_max, seaice(ki) + e_melt / fsic(ki)) |
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| 928 | END IF |
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| 929 | tslab(ki, 1) = t_freeze |
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| 930 | ELSE ! slab temperature above freezing |
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| 931 | ! ****** melt ice from below ******* |
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| 932 | ! quantity of melted ice |
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| 933 | e_melt = (tslab(ki, 1) - t_freeze) / cyang & |
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| 934 | / (ice_lat + ice_cap / 2. * (tice(ki) - t_freeze)) |
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| 935 | ! first decrease height to h_thick |
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| 936 | dhsic = MAX(0., MIN(seaice(ki) - h_ice_thick, e_melt / fsic(ki))) |
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| 937 | seaice(ki) = seaice(ki) - dhsic |
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| 938 | e_melt = e_melt - fsic(ki) * dhsic |
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| 939 | IF (e_melt>0) THEN |
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| 940 | ! frac_mf fraction used for height decrease |
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| 941 | dhsic = MAX(0., MIN(seaice(ki) - h_ice_min, e_melt * frac_mf / fsic(ki))) |
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| 942 | seaice(ki) = seaice(ki) - dhsic |
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| 943 | e_melt = e_melt - fsic(ki) * dhsic |
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| 944 | ! rest used to decrease fraction (up to 0!) |
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| 945 | dfsic = MIN(fsic(ki), e_melt / seaice(ki)) |
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| 946 | ! keep remaining in ocean |
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| 947 | e_melt = e_melt - dfsic * seaice(ki) |
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| 948 | END IF |
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| 949 | tslab(ki, 1) = t_freeze + e_melt * ice_lat * cyang |
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| 950 | fsic(ki) = fsic(ki) - dfsic |
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| 951 | END IF |
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| 952 | END DO |
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| 953 | bilg_cum(:) = 0. |
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| 954 | END IF ! coupling time |
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| 955 | |
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| 956 | !tests ice fraction |
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| 957 | WHERE (fsic<ice_frac_min) |
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| 958 | tslab(:, 1) = tslab(:, 1) - fsic * seaice * ice_lat * cyang |
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| 959 | tice = t_melt |
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| 960 | fsic = 0. |
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| 961 | seaice = 0. |
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| 962 | END WHERE |
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| 963 | |
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| 964 | END SUBROUTINE ocean_slab_ice |
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| 965 | |
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| 966 | !**************************************************************************************** |
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| 967 | |
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| 968 | SUBROUTINE ocean_slab_final |
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| 969 | |
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| 970 | !**************************************************************************************** |
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| 971 | ! Deallocate module variables |
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| 972 | !**************************************************************************************** |
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| 973 | IF (ALLOCATED(tslab)) DEALLOCATE(tslab) |
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| 974 | IF (ALLOCATED(fsic)) DEALLOCATE(fsic) |
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| 975 | IF (ALLOCATED(tice)) DEALLOCATE(tice) |
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| 976 | IF (ALLOCATED(seaice)) DEALLOCATE(seaice) |
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| 977 | IF (ALLOCATED(slab_bilg)) DEALLOCATE(slab_bilg) |
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| 978 | IF (ALLOCATED(bilg_cum)) DEALLOCATE(bilg_cum) |
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| 979 | IF (ALLOCATED(bils_cum)) DEALLOCATE(bils_cum) |
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| 980 | IF (ALLOCATED(taux_cum)) DEALLOCATE(taux_cum) |
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| 981 | IF (ALLOCATED(tauy_cum)) DEALLOCATE(tauy_cum) |
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| 982 | IF (ALLOCATED(dt_ekman)) DEALLOCATE(dt_ekman) |
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| 983 | IF (ALLOCATED(dt_hdiff)) DEALLOCATE(dt_hdiff) |
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| 984 | IF (ALLOCATED(dt_gm)) DEALLOCATE(dt_gm) |
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| 985 | IF (ALLOCATED(dt_qflux)) DEALLOCATE(dt_qflux) |
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| 986 | |
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| 987 | END SUBROUTINE ocean_slab_final |
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| 988 | |
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| 989 | END MODULE ocean_slab_mod |
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