| 1 | ! |
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| 2 | MODULE surf_landice_mod |
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| 3 | |
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| 4 | IMPLICIT NONE |
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| 5 | |
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| 6 | CONTAINS |
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| 7 | ! |
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| 8 | !**************************************************************************************** |
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| 9 | ! |
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| 10 | SUBROUTINE surf_landice(itime, dtime, knon, knindex, & |
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| 11 | rlon, rlat, debut, lafin, & |
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| 12 | rmu0, lwdownm, albedo, pphi1, & |
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| 13 | swnet, lwnet, tsurf, p1lay, & |
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| 14 | cdragh, cdragm, precip_rain, precip_snow, precip_bs, temp_air, spechum, & |
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| 15 | AcoefH, AcoefQ, BcoefH, BcoefQ, & |
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| 16 | AcoefU, AcoefV, BcoefU, BcoefV, & |
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| 17 | AcoefQBS, BcoefQBS, & |
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| 18 | ps, u1, v1, gustiness, rugoro, pctsrf, & |
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| 19 | snow, qsurf, qsol, qbs1, agesno, & |
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| 20 | tsoil, z0m, z0h, SFRWL, alb_dir, alb_dif, evap, fluxsens, fluxlat, fluxbs, & |
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| 21 | tsurf_new, dflux_s, dflux_l, & |
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| 22 | alt, slope, cloudf, & |
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| 23 | snowhgt, qsnow, to_ice, sissnow, & |
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| 24 | alb3, runoff, & |
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| 25 | flux_u1, flux_v1) |
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| 26 | |
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| 27 | USE dimphy |
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| 28 | USE geometry_mod, ONLY : longitude,latitude |
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| 29 | USE surface_data, ONLY : type_ocean, calice, calsno, landice_opt, iflag_albcalc |
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| 30 | USE fonte_neige_mod, ONLY : fonte_neige,run_off_lic,fqcalving_global,ffonte_global,fqfonte_global,runofflic_global |
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| 31 | USE cpl_mod, ONLY : cpl_send_landice_fields |
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| 32 | USE calcul_fluxs_mod |
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| 33 | USE phys_local_var_mod, ONLY : zxrhoslic, zxustartlic, zxqsaltlic |
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| 34 | USE phys_output_var_mod, ONLY : snow_o,zfra_o |
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| 35 | !FC |
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| 36 | USE ioipsl_getin_p_mod, ONLY : getin_p |
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| 37 | USE lmdz_blowing_snow_ini, ONLY : c_esalt_bs, zeta_bs, pbst_bs, prt_bs, rhoice_bs, rhohard_bs |
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| 38 | USE lmdz_blowing_snow_ini, ONLY : rhofresh_bs, tau_eqsalt_bs, tau_dens0_bs, tau_densmin_bs |
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| 39 | #ifdef CPP_INLANDSIS |
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| 40 | USE surf_inlandsis_mod, ONLY : surf_inlandsis |
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| 41 | #endif |
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| 42 | |
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| 43 | USE indice_sol_mod |
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| 44 | |
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| 45 | ! INCLUDE "indicesol.h" |
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| 46 | INCLUDE "dimsoil.h" |
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| 47 | INCLUDE "YOMCST.h" |
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| 48 | INCLUDE "clesphys.h" |
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| 49 | |
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| 50 | ! Input variables |
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| 51 | !**************************************************************************************** |
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| 52 | INTEGER, INTENT(IN) :: itime, knon |
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| 53 | INTEGER, DIMENSION(klon), INTENT(in) :: knindex |
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| 54 | REAL, INTENT(in) :: dtime |
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| 55 | REAL, DIMENSION(klon), INTENT(IN) :: swnet ! net shortwave radiance |
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| 56 | REAL, DIMENSION(klon), INTENT(IN) :: lwnet ! net longwave radiance |
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| 57 | REAL, DIMENSION(klon), INTENT(IN) :: tsurf |
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| 58 | REAL, DIMENSION(klon), INTENT(IN) :: p1lay |
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| 59 | REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragm |
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| 60 | REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow, precip_bs |
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| 61 | REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum |
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| 62 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ |
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| 63 | REAL, DIMENSION(klon), INTENT(IN) :: BcoefH, BcoefQ |
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| 64 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV |
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| 65 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefQBS, BcoefQBS |
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| 66 | REAL, DIMENSION(klon), INTENT(IN) :: ps |
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| 67 | REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness, qbs1 |
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| 68 | REAL, DIMENSION(klon), INTENT(IN) :: rugoro |
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| 69 | REAL, DIMENSION(klon,nbsrf), INTENT(IN) :: pctsrf |
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| 70 | |
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| 71 | LOGICAL, INTENT(IN) :: debut !true if first step |
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| 72 | LOGICAL, INTENT(IN) :: lafin !true if last step |
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| 73 | REAL, DIMENSION(klon), INTENT(IN) :: rlon, rlat |
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| 74 | REAL, DIMENSION(klon), INTENT(IN) :: rmu0 |
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| 75 | REAL, DIMENSION(klon), INTENT(IN) :: lwdownm !ylwdown |
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| 76 | REAL, DIMENSION(klon), INTENT(IN) :: albedo !mean albedo |
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| 77 | REAL, DIMENSION(klon), INTENT(IN) :: pphi1 |
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| 78 | REAL, DIMENSION(klon), INTENT(IN) :: alt !mean altitude of the grid box |
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| 79 | REAL, DIMENSION(klon), INTENT(IN) :: slope !mean slope in grid box |
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| 80 | REAL, DIMENSION(klon), INTENT(IN) :: cloudf !total cloud fraction |
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| 81 | |
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| 82 | ! In/Output variables |
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| 83 | !**************************************************************************************** |
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| 84 | REAL, DIMENSION(klon), INTENT(INOUT) :: snow, qsol |
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| 85 | REAL, DIMENSION(klon), INTENT(INOUT) :: agesno |
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| 86 | REAL, DIMENSION(klon, nsoilmx), INTENT(INOUT) :: tsoil |
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| 87 | |
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| 88 | ! Output variables |
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| 89 | !**************************************************************************************** |
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| 90 | REAL, DIMENSION(klon), INTENT(OUT) :: qsurf |
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| 91 | REAL, DIMENSION(klon), INTENT(OUT) :: z0m, z0h |
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| 92 | !albedo SB >>> |
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| 93 | ! REAL, DIMENSION(klon), INTENT(OUT) :: alb1 ! new albedo in visible SW interval |
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| 94 | ! REAL, DIMENSION(klon), INTENT(OUT) :: alb2 ! new albedo in near IR interval |
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| 95 | REAL, DIMENSION(6), INTENT(IN) :: SFRWL |
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| 96 | REAL, DIMENSION(klon,nsw), INTENT(OUT) :: alb_dir,alb_dif |
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| 97 | !albedo SB <<< |
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| 98 | REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat |
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| 99 | REAL, DIMENSION(klon), INTENT(OUT) :: fluxbs |
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| 100 | REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new |
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| 101 | REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l |
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| 102 | REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1 |
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| 103 | |
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| 104 | REAL, DIMENSION(klon), INTENT(OUT) :: alb3 |
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| 105 | REAL, DIMENSION(klon), INTENT(OUT) :: qsnow !column water in snow [kg/m2] |
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| 106 | REAL, DIMENSION(klon), INTENT(OUT) :: snowhgt !Snow height (m) |
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| 107 | REAL, DIMENSION(klon), INTENT(OUT) :: to_ice |
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| 108 | REAL, DIMENSION(klon), INTENT(OUT) :: sissnow |
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| 109 | REAL, DIMENSION(klon), INTENT(OUT) :: runoff !Land ice runoff |
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| 110 | |
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| 111 | |
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| 112 | ! Local variables |
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| 113 | !**************************************************************************************** |
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| 114 | REAL, DIMENSION(klon) :: soilcap, soilflux |
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| 115 | REAL, DIMENSION(klon) :: cal, beta, dif_grnd |
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| 116 | REAL, DIMENSION(klon) :: zfra, alb_neig |
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| 117 | REAL, DIMENSION(klon) :: radsol |
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| 118 | REAL, DIMENSION(klon) :: u0, v0, u1_lay, v1_lay, ustar |
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| 119 | INTEGER :: i,j,nt |
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| 120 | REAL, DIMENSION(klon) :: fqfonte,ffonte |
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| 121 | REAL, DIMENSION(klon) :: run_off_lic_frac |
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| 122 | REAL, DIMENSION(klon) :: emis_new !Emissivity |
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| 123 | REAL, DIMENSION(klon) :: swdown,lwdown |
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| 124 | REAL, DIMENSION(klon) :: precip_snow_adv, snow_adv !Snow Drift precip./advection (not used in inlandsis) |
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| 125 | REAL, DIMENSION(klon) :: erod !erosion of surface snow (flux, kg/m2/s like evap) |
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| 126 | REAL, DIMENSION(klon) :: zsl_height, wind_velo !surface layer height, wind spd |
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| 127 | REAL, DIMENSION(klon) :: dens_air, snow_cont_air !air density; snow content air |
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| 128 | REAL, DIMENSION(klon) :: alb_soil !albedo of underlying ice |
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| 129 | REAL, DIMENSION(klon) :: pexner !Exner potential |
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| 130 | REAL :: pref |
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| 131 | REAL, DIMENSION(klon,nsoilmx) :: tsoil0 !modif |
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| 132 | REAL :: dtis ! subtimestep |
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| 133 | LOGICAL :: debut_is, lafin_is ! debut and lafin for inlandsis |
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| 134 | |
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| 135 | CHARACTER (len = 20) :: modname = 'surf_landice' |
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| 136 | CHARACTER (len = 80) :: abort_message |
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| 137 | |
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| 138 | |
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| 139 | REAL,DIMENSION(klon) :: alb1,alb2 |
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| 140 | REAL,DIMENSION(klon) :: precip_totsnow, evap_totsnow |
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| 141 | REAL, DIMENSION (klon,6) :: alb6 |
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| 142 | REAL :: esalt |
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| 143 | REAL :: lambdasalt,fluxsalt, csalt, nunu, aa, bb, cc |
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| 144 | REAL :: tau_dens, maxerosion |
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| 145 | REAL, DIMENSION(klon) :: ws1, rhod, rhos, ustart0, ustart, qsalt, hsalt |
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| 146 | REAL, DIMENSION(klon) :: fluxbs_1, fluxbs_2, bsweight_fresh |
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| 147 | LOGICAL, DIMENSION(klon) :: ok_remaining_freshsnow |
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| 148 | |
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| 149 | ! End definition |
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| 150 | !**************************************************************************************** |
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| 151 | !FC |
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| 152 | !FC |
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| 153 | REAL,SAVE :: alb_vis_sno_lic |
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| 154 | !$OMP THREADPRIVATE(alb_vis_sno_lic) |
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| 155 | REAL,SAVE :: alb_nir_sno_lic |
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| 156 | !$OMP THREADPRIVATE(alb_nir_sno_lic) |
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| 157 | LOGICAL, SAVE :: firstcall = .TRUE. |
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| 158 | !$OMP THREADPRIVATE(firstcall) |
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| 159 | |
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| 160 | |
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| 161 | !FC firtscall initializations |
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| 162 | !****************************************************************************************** |
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| 163 | IF (firstcall) THEN |
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| 164 | alb_vis_sno_lic=0.77 |
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| 165 | CALL getin_p('alb_vis_sno_lic',alb_vis_sno_lic) |
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| 166 | PRINT*, 'alb_vis_sno_lic',alb_vis_sno_lic |
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| 167 | alb_nir_sno_lic=0.77 |
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| 168 | CALL getin_p('alb_nir_sno_lic',alb_nir_sno_lic) |
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| 169 | PRINT*, 'alb_nir_sno_lic',alb_nir_sno_lic |
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| 170 | |
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| 171 | firstcall=.false. |
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| 172 | ENDIF |
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| 173 | !****************************************************************************************** |
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| 174 | |
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| 175 | ! Initialize output variables |
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| 176 | alb3(:) = 999999. |
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| 177 | alb2(:) = 999999. |
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| 178 | alb1(:) = 999999. |
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| 179 | fluxbs(:)=0. |
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| 180 | runoff(:) = 0. |
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| 181 | !**************************************************************************************** |
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| 182 | ! Calculate total absorbed radiance at surface |
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| 183 | ! |
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| 184 | !**************************************************************************************** |
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| 185 | radsol(:) = 0.0 |
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| 186 | radsol(1:knon) = swnet(1:knon) + lwnet(1:knon) |
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| 187 | |
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| 188 | !**************************************************************************************** |
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| 189 | |
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| 190 | !**************************************************************************************** |
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| 191 | ! landice_opt = 0 : soil_model, calcul_flux, fonte_neige, ... |
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| 192 | ! landice_opt = 1 : prepare and call INterace Lmdz SISvat (INLANDSIS) |
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| 193 | !**************************************************************************************** |
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| 194 | |
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| 195 | |
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| 196 | IF (landice_opt .EQ. 1) THEN |
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| 197 | |
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| 198 | !**************************************************************************************** |
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| 199 | ! CALL to INLANDSIS interface |
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| 200 | !**************************************************************************************** |
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| 201 | #ifdef CPP_INLANDSIS |
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| 202 | |
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| 203 | debut_is=debut |
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| 204 | lafin_is=.false. |
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| 205 | ! Suppose zero surface speed |
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| 206 | u0(:) = 0.0 |
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| 207 | v0(:) = 0.0 |
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| 208 | |
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| 209 | |
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| 210 | CALL calcul_flux_wind(knon, dtime, & |
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| 211 | u0, v0, u1, v1, gustiness, cdragm, & |
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| 212 | AcoefU, AcoefV, BcoefU, BcoefV, & |
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| 213 | p1lay, temp_air, & |
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| 214 | flux_u1, flux_v1) |
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| 215 | |
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| 216 | |
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| 217 | ! Set constants and compute some input for SISVAT |
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| 218 | ! = 1000 hPa |
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| 219 | ! and calculate incoming flux for SW and LW interval: swdown, lwdown |
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| 220 | swdown(:) = 0.0 |
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| 221 | lwdown(:) = 0.0 |
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| 222 | snow_cont_air(:) = 0. ! the snow content in air is not a prognostic variable of the model |
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| 223 | alb_soil(:) = 0.4 ! before albedo(:) but here it is the ice albedo that we have to set |
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| 224 | ustar(:) = 0. |
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| 225 | pref = 100000. |
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| 226 | DO i = 1, knon |
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| 227 | swdown(i) = swnet(i)/(1-albedo(i)) |
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| 228 | lwdown(i) = lwdownm(i) |
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| 229 | wind_velo(i) = u1(i)**2 + v1(i)**2 |
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| 230 | wind_velo(i) = wind_velo(i)**0.5 |
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| 231 | pexner(i) = (p1lay(i)/pref)**(RD/RCPD) |
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| 232 | dens_air(i) = p1lay(i)/RD/temp_air(i) ! dry air density |
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| 233 | zsl_height(i) = pphi1(i)/RG |
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| 234 | tsoil0(i,:) = tsoil(i,:) |
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| 235 | ustar(i)= (cdragm(i)*(wind_velo(i)**2))**0.5 |
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| 236 | END DO |
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| 237 | |
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| 238 | |
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| 239 | |
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| 240 | dtis=dtime |
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| 241 | |
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| 242 | IF (lafin) THEN |
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| 243 | lafin_is=.true. |
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| 244 | END IF |
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| 245 | |
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| 246 | CALL surf_inlandsis(knon, rlon, rlat, knindex, itime, dtis, debut_is, lafin_is,& |
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| 247 | rmu0, swdown, lwdown, albedo, pexner, ps, p1lay, precip_rain, precip_snow, & |
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| 248 | zsl_height, wind_velo, ustar, temp_air, dens_air, spechum, tsurf,& |
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| 249 | rugoro, snow_cont_air, alb_soil, alt, slope, cloudf, & |
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| 250 | radsol, qsol, tsoil0, snow, zfra, snowhgt, qsnow, to_ice, sissnow,agesno, & |
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| 251 | AcoefH, AcoefQ, BcoefH, BcoefQ, cdragm, cdragh, & |
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| 252 | run_off_lic, fqfonte, ffonte, evap, erod, fluxsens, fluxlat,dflux_s, dflux_l, & |
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| 253 | tsurf_new, alb1, alb2, alb3, alb6, & |
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| 254 | emis_new, z0m, z0h, qsurf) |
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| 255 | |
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| 256 | debut_is=.false. |
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| 257 | |
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| 258 | |
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| 259 | ! Treatment of snow melting and calving |
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| 260 | |
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| 261 | ! for consistency with standard LMDZ, add calving to run_off_lic |
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| 262 | run_off_lic(:)=run_off_lic(:) + to_ice(:) |
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| 263 | |
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| 264 | DO i = 1, knon |
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| 265 | ffonte_global(knindex(i),is_lic) = ffonte(i) |
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| 266 | fqfonte_global(knindex(i),is_lic) = fqfonte(i)! net melting= melting - refreezing |
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| 267 | fqcalving_global(knindex(i),is_lic) = to_ice(i) ! flux |
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| 268 | runofflic_global(knindex(i)) = run_off_lic(i) |
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| 269 | ENDDO |
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| 270 | ! Here, we assume that the calving term is equal to the to_ice term |
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| 271 | ! (no ice accumulation) |
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| 272 | |
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| 273 | |
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| 274 | #else |
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| 275 | abort_message='Pb de coherence: landice_opt = 1 mais CPP_INLANDSIS = .false.' |
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| 276 | CALL abort_physic(modname,abort_message,1) |
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| 277 | #endif |
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| 278 | |
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| 279 | |
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| 280 | ELSE |
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| 281 | |
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| 282 | !**************************************************************************************** |
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| 283 | ! Soil calculations |
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| 284 | ! |
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| 285 | !**************************************************************************************** |
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| 286 | |
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| 287 | ! EV: use calbeta |
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| 288 | CALL calbeta(dtime, is_lic, knon, snow, qsol, beta, cal, dif_grnd) |
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| 289 | |
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| 290 | |
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| 291 | ! use soil model and recalculate properly cal |
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| 292 | IF (soil_model) THEN |
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| 293 | CALL soil(dtime, is_lic, knon, snow, tsurf, qsol, & |
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| 294 | & longitude(knindex(1:knon)), latitude(knindex(1:knon)), tsoil, soilcap, soilflux) |
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| 295 | cal(1:knon) = RCPD / soilcap(1:knon) |
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| 296 | radsol(1:knon) = radsol(1:knon) + soilflux(1:knon) |
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| 297 | ELSE |
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| 298 | cal = RCPD * calice |
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| 299 | WHERE (snow > 0.0) cal = RCPD * calsno |
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| 300 | ENDIF |
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| 301 | |
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| 302 | |
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| 303 | !**************************************************************************************** |
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| 304 | ! Calulate fluxes |
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| 305 | ! |
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| 306 | !**************************************************************************************** |
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| 307 | ! beta(:) = 1.0 |
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| 308 | ! dif_grnd(:) = 0.0 |
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| 309 | |
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| 310 | ! Suppose zero surface speed |
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| 311 | u0(:)=0.0 |
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| 312 | v0(:)=0.0 |
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| 313 | u1_lay(:) = u1(:) - u0(:) |
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| 314 | v1_lay(:) = v1(:) - v0(:) |
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| 315 | |
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| 316 | CALL calcul_fluxs(knon, is_lic, dtime, & |
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| 317 | tsurf, p1lay, cal, beta, cdragh, cdragh, ps, & |
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| 318 | precip_rain, precip_snow, snow, qsurf, & |
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| 319 | radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, & |
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| 320 | 1.,AcoefH, AcoefQ, BcoefH, BcoefQ, & |
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| 321 | tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l) |
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| 322 | |
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| 323 | CALL calcul_flux_wind(knon, dtime, & |
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| 324 | u0, v0, u1, v1, gustiness, cdragm, & |
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| 325 | AcoefU, AcoefV, BcoefU, BcoefV, & |
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| 326 | p1lay, temp_air, & |
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| 327 | flux_u1, flux_v1) |
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| 328 | |
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| 329 | |
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| 330 | !**************************************************************************************** |
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| 331 | ! Calculate albedo |
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| 332 | ! |
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| 333 | !**************************************************************************************** |
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| 334 | |
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| 335 | ! |
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| 336 | !IM: plusieurs choix/tests sur l'albedo des "glaciers continentaux" |
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| 337 | ! alb1(1 : knon) = 0.6 !IM cf FH/GK |
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| 338 | ! alb1(1 : knon) = 0.82 |
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| 339 | ! alb1(1 : knon) = 0.77 !211003 Ksta0.77 |
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| 340 | ! alb1(1 : knon) = 0.8 !KstaTER0.8 & LMD_ARMIP5 |
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| 341 | !IM: KstaTER0.77 & LMD_ARMIP6 |
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| 342 | |
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| 343 | ! Attantion: alb1 and alb2 are not the same! |
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| 344 | alb1(1:knon) = alb_vis_sno_lic |
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| 345 | alb2(1:knon) = alb_nir_sno_lic |
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| 346 | |
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| 347 | |
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| 348 | !**************************************************************************************** |
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| 349 | ! Rugosity |
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| 350 | ! |
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| 351 | !**************************************************************************************** |
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| 352 | z0m = z0m_landice |
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| 353 | z0h = z0h_landice |
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| 354 | !z0m = SQRT(z0m**2+rugoro**2) |
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| 355 | |
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| 356 | |
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| 357 | !**************************************************************************************** |
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| 358 | ! Simple blowing snow param |
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| 359 | !**************************************************************************************** |
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| 360 | ! we proceed in 2 steps: |
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| 361 | ! first we erode - if possible -the accumulated snow during the time step |
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| 362 | ! then we update the density of the underlying layer and see if we can also erode |
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| 363 | ! this layer |
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| 364 | |
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| 365 | |
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| 366 | if (ok_bs) then |
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| 367 | fluxbs(:)=0. |
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| 368 | do j=1,klon |
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| 369 | ws1(j)=(u1(j)**2+v1(j)**2)**0.5 |
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| 370 | ustar(j)=(cdragm(j)*(u1(j)**2+v1(j)**2))**0.5 |
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| 371 | rhod(j)=p1lay(j)/RD/temp_air(j) |
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| 372 | ustart0(j) =(log(2.868)-log(1.625))/0.085*sqrt(cdragm(j)) |
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| 373 | enddo |
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| 374 | |
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| 375 | ! 1st step: erosion of fresh snow accumulated during the time step |
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| 376 | do j=1, knon |
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| 377 | if (precip_snow(j) .GT. 0.) then |
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| 378 | rhos(j)=rhofresh_bs |
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| 379 | ! blowing snow flux formula used in MAR |
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| 380 | ustart(j)=ustart0(j)*exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))*exp(max(0.,rhos(j)-rhohard_bs)) |
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| 381 | ! we have multiplied by exp to prevent erosion when rhos>rhohard_bs |
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| 382 | ! computation of qbs at the top of the saltation layer |
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| 383 | ! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001) |
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| 384 | esalt=1./(c_esalt_bs*max(1.e-6,ustar(j))) |
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| 385 | hsalt(j)=0.08436*(max(1.e-6,ustar(j))**1.27) |
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| 386 | qsalt(j)=(max(ustar(j)**2-ustart(j)**2,0.))/(RG*hsalt(j))*esalt |
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| 387 | ! calculation of erosion (flux positive towards the surface here) |
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| 388 | ! consistent with implicit resolution of turbulent mixing equation |
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| 389 | ! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s |
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| 390 | ! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level) |
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| 391 | ! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer |
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| 392 | ! (rho*qsalt*hsalt) |
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| 393 | ! during this first step we also lower bound the erosion to the amount of fresh snow accumulated during the time step |
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| 394 | maxerosion=min(precip_snow(j),hsalt(j)*qsalt(j)*rhod(j)/tau_eqsalt_bs) |
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| 395 | |
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| 396 | fluxbs_1(j)=rhod(j)*ws1(j)*cdragh(j)*zeta_bs*(AcoefQBS(j)-qsalt(j)) & |
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| 397 | / (1.-rhod(j)*ws1(j)*cdragh(j)*zeta_bs*BcoefQBS(j)*dtime) |
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| 398 | fluxbs_1(j)=max(-maxerosion,fluxbs_1(j)) |
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| 399 | |
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| 400 | if (precip_snow(j) .gt. abs(fluxbs_1(j))) then |
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| 401 | ok_remaining_freshsnow(j)=.true. |
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| 402 | bsweight_fresh(j)=1. |
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| 403 | else |
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| 404 | ok_remaining_freshsnow(j)=.false. |
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| 405 | bsweight_fresh(j)=exp(-(abs(fluxbs_1(j))-precip_snow(j))/precip_snow(j)) |
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| 406 | endif |
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| 407 | else |
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| 408 | ok_remaining_freshsnow(j)=.false. |
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| 409 | fluxbs_1(j)=0. |
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| 410 | bsweight_fresh(j)=0. |
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| 411 | endif |
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| 412 | enddo |
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| 413 | |
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| 414 | |
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| 415 | ! we now compute the snow age of the overlying layer (snow surface after erosion of the fresh snow accumulated during the time step) |
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| 416 | ! this is done through the routine albsno |
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| 417 | CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)+fluxbs_1(:)) |
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| 418 | |
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| 419 | ! 2nd step: |
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| 420 | ! computation of threshold friction velocity |
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| 421 | ! which depends on surface snow density |
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| 422 | do j = 1, knon |
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| 423 | if (ok_remaining_freshsnow(j)) then |
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| 424 | fluxbs_2(j)=0. |
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| 425 | else |
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| 426 | ! we start eroding the underlying layer |
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| 427 | ! estimation of snow density |
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| 428 | ! snow density increases with snow age and |
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| 429 | ! increases even faster in case of sedimentation of blowing snow or rain |
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| 430 | tau_dens=max(tau_densmin_bs, tau_dens0_bs*exp(-abs(precip_bs(j))/pbst_bs - & |
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| 431 | abs(precip_rain(j))/prt_bs)*exp(-max(tsurf(j)-RTT,0.))) |
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| 432 | rhos(j)=rhofresh_bs+(rhohard_bs-rhofresh_bs)*(1.-exp(-agesno(j)*86400.0/tau_dens)) |
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| 433 | ! blowing snow flux formula used in MAR |
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| 434 | ustart(j)=ustart0(j)*exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))*exp(max(0.,rhos(j)-rhohard_bs)) |
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| 435 | ! we have multiplied by exp to prevent erosion when rhos>rhohard_bs |
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| 436 | ! computation of qbs at the top of the saltation layer |
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| 437 | ! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001) |
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| 438 | esalt=1./(c_esalt_bs*max(1.e-6,ustar(j))) |
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| 439 | hsalt(j)=0.08436*(max(1.e-6,ustar(j))**1.27) |
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| 440 | qsalt(j)=(max(ustar(j)**2-ustart(j)**2,0.))/(RG*hsalt(j))*esalt |
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| 441 | ! calculation of erosion (flux positive towards the surface here) |
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| 442 | ! consistent with implicit resolution of turbulent mixing equation |
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| 443 | ! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s |
|---|
| 444 | ! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level) |
|---|
| 445 | ! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer |
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| 446 | ! (rho*qsalt*hsalt) |
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| 447 | maxerosion=hsalt(j)*qsalt(j)*rhod(j)/tau_eqsalt_bs |
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| 448 | fluxbs_2(j)=rhod(j)*ws1(j)*cdragh(j)*zeta_bs*(AcoefQBS(j)-qsalt(j)) & |
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| 449 | / (1.-rhod(j)*ws1(j)*cdragh(j)*zeta_bs*BcoefQBS(j)*dtime) |
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| 450 | fluxbs_2(j)=max(-maxerosion,fluxbs_2(j)) |
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| 451 | endif |
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| 452 | enddo |
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| 453 | |
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| 454 | |
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| 455 | |
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| 456 | |
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| 457 | ! final flux and outputs |
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| 458 | do j=1, knon |
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| 459 | ! total flux is the erosion of fresh snow + |
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| 460 | ! a fraction of the underlying snow (if all the fresh snow has been eroded) |
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| 461 | ! the calculation of the fraction is quite delicate since we do not know |
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| 462 | ! how much time was needed to erode the fresh snow. We assume that this time |
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| 463 | ! is dt*exp(-(abs(fluxbs1)-precipsnow)/precipsnow)=dt*bsweight_fresh |
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| 464 | |
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| 465 | fluxbs(j)=fluxbs_1(j)+fluxbs_2(j)*(1.-bsweight_fresh(j)) |
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| 466 | i = knindex(j) |
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| 467 | zxustartlic(i) = ustart(j) |
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| 468 | zxrhoslic(i) = rhos(j) |
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| 469 | zxqsaltlic(i)=qsalt(j) |
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| 470 | enddo |
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| 471 | |
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| 472 | |
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| 473 | else ! not ok_bs |
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| 474 | ! those lines are useful to calculate the snow age |
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| 475 | CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)) |
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| 476 | |
|---|
| 477 | endif ! if ok_bs |
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| 478 | |
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| 479 | |
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| 480 | |
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| 481 | !**************************************************************************************** |
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| 482 | ! Calculate snow amount |
|---|
| 483 | ! |
|---|
| 484 | !**************************************************************************************** |
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| 485 | IF (ok_bs) THEN |
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| 486 | precip_totsnow(:)=precip_snow(:)+precip_bs(:) |
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| 487 | evap_totsnow(:)=evap(:)-fluxbs(:) ! flux bs is positive towards the surface (snow erosion) |
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| 488 | ELSE |
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| 489 | precip_totsnow(:)=precip_snow(:) |
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| 490 | evap_totsnow(:)=evap(:) |
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| 491 | ENDIF |
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| 492 | |
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| 493 | |
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| 494 | CALL fonte_neige(knon, is_lic, knindex, dtime, & |
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| 495 | tsurf, precip_rain, precip_totsnow, & |
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| 496 | snow, qsol, tsurf_new, evap_totsnow) |
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| 497 | |
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| 498 | |
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| 499 | WHERE (snow(1 : knon) .LT. 0.0001) agesno(1 : knon) = 0. |
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| 500 | zfra(1:knon) = MAX(0.0,MIN(1.0,snow(1:knon)/(snow(1:knon)+10.0))) |
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| 501 | |
|---|
| 502 | |
|---|
| 503 | END IF ! landice_opt |
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| 504 | |
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| 505 | |
|---|
| 506 | !**************************************************************************************** |
|---|
| 507 | ! Send run-off on land-ice to coupler if coupled ocean. |
|---|
| 508 | ! run_off_lic has been calculated in fonte_neige or surf_inlandsis |
|---|
| 509 | ! If landice_opt>=2, corresponding call is done from surf_land_orchidee |
|---|
| 510 | !**************************************************************************************** |
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| 511 | IF (type_ocean=='couple' .AND. landice_opt .LT. 2) THEN |
|---|
| 512 | ! Compress fraction where run_off_lic is active (here all pctsrf(is_lic)) |
|---|
| 513 | run_off_lic_frac(:)=0.0 |
|---|
| 514 | DO j = 1, knon |
|---|
| 515 | i = knindex(j) |
|---|
| 516 | run_off_lic_frac(j) = pctsrf(i,is_lic) |
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| 517 | ENDDO |
|---|
| 518 | |
|---|
| 519 | CALL cpl_send_landice_fields(itime, knon, knindex, run_off_lic, run_off_lic_frac) |
|---|
| 520 | ENDIF |
|---|
| 521 | |
|---|
| 522 | ! transfer runoff rate [kg/m2/s](!) to physiq for output |
|---|
| 523 | runoff(1:knon)=run_off_lic(1:knon)/dtime |
|---|
| 524 | |
|---|
| 525 | snow_o=0. |
|---|
| 526 | zfra_o = 0. |
|---|
| 527 | DO j = 1, knon |
|---|
| 528 | i = knindex(j) |
|---|
| 529 | snow_o(i) = snow(j) |
|---|
| 530 | zfra_o(i) = zfra(j) |
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| 531 | ENDDO |
|---|
| 532 | |
|---|
| 533 | |
|---|
| 534 | !albedo SB >>> |
|---|
| 535 | select case(NSW) |
|---|
| 536 | case(2) |
|---|
| 537 | alb_dir(1:knon,1)=alb1(1:knon) |
|---|
| 538 | alb_dir(1:knon,2)=alb2(1:knon) |
|---|
| 539 | case(4) |
|---|
| 540 | alb_dir(1:knon,1)=alb1(1:knon) |
|---|
| 541 | alb_dir(1:knon,2)=alb2(1:knon) |
|---|
| 542 | alb_dir(1:knon,3)=alb2(1:knon) |
|---|
| 543 | alb_dir(1:knon,4)=alb2(1:knon) |
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| 544 | case(6) |
|---|
| 545 | alb_dir(1:knon,1)=alb1(1:knon) |
|---|
| 546 | alb_dir(1:knon,2)=alb1(1:knon) |
|---|
| 547 | alb_dir(1:knon,3)=alb1(1:knon) |
|---|
| 548 | alb_dir(1:knon,4)=alb2(1:knon) |
|---|
| 549 | alb_dir(1:knon,5)=alb2(1:knon) |
|---|
| 550 | alb_dir(1:knon,6)=alb2(1:knon) |
|---|
| 551 | |
|---|
| 552 | IF ((landice_opt .EQ. 1) .AND. (iflag_albcalc .EQ. 2)) THEN |
|---|
| 553 | alb_dir(1:knon,1)=alb6(1:knon,1) |
|---|
| 554 | alb_dir(1:knon,2)=alb6(1:knon,2) |
|---|
| 555 | alb_dir(1:knon,3)=alb6(1:knon,3) |
|---|
| 556 | alb_dir(1:knon,4)=alb6(1:knon,4) |
|---|
| 557 | alb_dir(1:knon,5)=alb6(1:knon,5) |
|---|
| 558 | alb_dir(1:knon,6)=alb6(1:knon,6) |
|---|
| 559 | ENDIF |
|---|
| 560 | |
|---|
| 561 | end select |
|---|
| 562 | alb_dif=alb_dir |
|---|
| 563 | !albedo SB <<< |
|---|
| 564 | |
|---|
| 565 | |
|---|
| 566 | END SUBROUTINE surf_landice |
|---|
| 567 | ! |
|---|
| 568 | !**************************************************************************************** |
|---|
| 569 | ! |
|---|
| 570 | END MODULE surf_landice_mod |
|---|
| 571 | |
|---|
| 572 | |
|---|
| 573 | |
|---|
