| 1 | module dust_rad_adjust_mod |
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| 2 | |
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| 3 | implicit none |
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| 4 | |
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| 5 | real,save,allocatable :: dust_rad_adjust_prev(:) ! adjustment coefficient |
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| 6 | ! computed when at current t_scenario |
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| 7 | real,save,allocatable :: dust_rad_adjust_next(:) ! adjustment coefficient |
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| 8 | ! computed for t_scenario of the next sol |
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| 9 | |
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| 10 | !$OMP THREADPRIVATE(dust_rad_adjust_prev,dust_rad_adjust_next) |
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| 11 | |
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| 12 | contains |
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| 13 | |
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| 14 | subroutine compute_dust_rad_adjust(ngrid,nlayer,zday,pplev, & |
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| 15 | taudust,dust_rad_adjust) |
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| 16 | |
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| 17 | use geometry_mod, only: longitude_deg |
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| 18 | use time_phylmdz_mod, only: dtphys, daysec |
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| 19 | use dust_param_mod, only: odpref, t_scenario_sol |
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| 20 | |
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| 21 | implicit none |
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| 22 | |
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| 23 | integer,intent(in) :: ngrid ! number of atmospheric columns |
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| 24 | integer,intent(in) :: nlayer ! number of atmospheric levels |
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| 25 | real,intent(in) :: zday ! tim (in sols and fraction thereof) |
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| 26 | real,intent(in) :: pplev(ngrid,nlayer+1) ! pressure (Pa) at layer boundaries |
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| 27 | real,intent(in) :: taudust(ngrid) ! visible dust columns opacity in the GCM |
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| 28 | real,intent(out) :: dust_rad_adjust(ngrid) ! radiative adjustment coefficient |
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| 29 | ! for dust |
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| 30 | |
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| 31 | real,allocatable,save :: local_time(:) ! LT at current physics time step |
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| 32 | real,allocatable,save :: local_time_prevdt(:) ! LT at previous physics time step |
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| 33 | real :: zday_prevdt !value of zday at previous physics time step |
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| 34 | real,save :: zday_scenario ! to fetch dod values from the scenario |
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| 35 | real,save :: zday_scenario_next ! to fetch dod values from the scenario the next day |
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| 36 | logical,save :: firstcall=.true. |
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| 37 | integer :: ig |
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| 38 | ! real,allocatable,save :: tau_pref_scenario(:) |
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| 39 | real,allocatable,save :: tau_pref_scenario_next(:) |
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| 40 | real :: weight ! interpolation weight |
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| 41 | real,save :: zday_prev_call=-666. ! stored value of zday from previous call |
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| 42 | |
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| 43 | ! 0. preliminary stuff |
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| 44 | ! NB: this routine may be called multiple times per physics |
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| 45 | ! so we have to save some arrays to store the information and not |
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| 46 | ! recompute it for each call |
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| 47 | |
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| 48 | if (firstcall) then |
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| 49 | write(*,*) "compute_dust_rad_adjust: dust scenario assumed exact at", & |
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| 50 | " time(sol)=",t_scenario_sol |
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| 51 | allocate(local_time(ngrid)) |
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| 52 | allocate(local_time_prevdt(ngrid)) |
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| 53 | ! allocate(tau_pref_scenario(ngrid)) |
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| 54 | allocate(tau_pref_scenario_next(ngrid)) |
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| 55 | firstcall=.false. |
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| 56 | endif ! of if firstcall |
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| 57 | |
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| 58 | ! 1. Compute local times (in sol fraction), if not already done |
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| 59 | if (zday/=zday_prev_call) then |
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| 60 | local_time(1:ngrid)=modulo(1.+(zday-INT(zday)) + & |
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| 61 | (longitude_deg(1:ngrid)/15)/24,1.) |
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| 62 | zday_prevdt=zday-dtphys/daysec |
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| 63 | local_time_prevdt(1:ngrid)=modulo(1.+(zday_prevdt-INT(zday_prevdt)) + & |
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| 64 | (longitude_deg(1:ngrid)/15)/24,1.) |
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| 65 | |
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| 66 | zday_scenario=zday-modulo(zday,1.) ! integer value of the day: the scenario |
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| 67 | ! opacity is assumed to be measured at 2pm but stored at nidnight |
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| 68 | zday_scenario_next=zday_scenario+1 |
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| 69 | endif ! of if (zday/=zday_prev_call) |
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| 70 | |
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| 71 | ! 2. Load dust opacities for zday_scenario and zday_scenario_next |
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| 72 | ! if not already done |
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| 73 | if (zday/=zday_prev_call) then |
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| 74 | ! call read_dust_scenario(ngrid,nlayer,zday_scenario,pplev, & |
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| 75 | ! tau_pref_scenario) |
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| 76 | call read_dust_scenario(ngrid,nlayer,zday_scenario_next,pplev, & |
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| 77 | tau_pref_scenario_next) |
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| 78 | endif ! of if (zday/=zday_prev_call) |
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| 79 | |
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| 80 | ! 3. Update dust_rad_adjust_* for grid points which just reached 2pm |
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| 81 | ! but only when this routine is called for the first time |
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| 82 | ! during this time step |
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| 83 | if (zday/=zday_prev_call) then |
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| 84 | do ig=1,ngrid |
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| 85 | if ((local_time(ig).ge.t_scenario_sol).and. & |
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| 86 | (local_time_prevdt(ig).lt.(t_scenario_sol))) then |
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| 87 | ! store previous "next" as "prev" (NB we could also decide to recompute |
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| 88 | ! it using the current taudust...) |
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| 89 | dust_rad_adjust_prev(ig)=dust_rad_adjust_next(ig) |
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| 90 | ! compute new target based on current dust opacity |
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| 91 | dust_rad_adjust_next(ig)=tau_pref_scenario_next(ig)* & |
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| 92 | pplev(ig,1)/odpref/taudust(ig) |
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| 93 | endif |
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| 94 | enddo |
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| 95 | endif ! of if (zday/=zday_prev_call) |
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| 96 | |
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| 97 | ! 4. Compute dust_rad_adjust using linear interpolation |
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| 98 | ! between dust_rad_adjust_prev and dust_rad_adjust_next |
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| 99 | do ig=1,ngrid |
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| 100 | ! prev and next are separated by a sol exactly |
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| 101 | ! we just need the distance (in sol) between current local time |
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| 102 | ! and 2pm the day before |
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| 103 | if (local_time(ig).ge.t_scenario_sol) then |
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| 104 | ! we are between t_scenario_sol and midnight |
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| 105 | weight=local_time(ig)-t_scenario_sol |
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| 106 | else |
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| 107 | ! we are between midnight and t_scenario_sol of the next day |
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| 108 | weight=(1.-t_scenario_sol)+local_time(ig) |
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| 109 | endif |
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| 110 | dust_rad_adjust(ig)=dust_rad_adjust_prev(ig)+ & |
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| 111 | weight* & |
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| 112 | (dust_rad_adjust_next(ig)-dust_rad_adjust_prev(ig)) |
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| 113 | enddo! of do=ig=1,ngrid |
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| 114 | |
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| 115 | ! update zday_prev_call |
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| 116 | zday_prev_call=zday |
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| 117 | |
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| 118 | end subroutine compute_dust_rad_adjust |
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| 119 | |
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| 120 | !======================================================================= |
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| 121 | ! Initialization of the module variables |
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| 122 | |
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| 123 | subroutine ini_dust_rad_adjust_mod(ngrid) |
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| 124 | |
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| 125 | implicit none |
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| 126 | |
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| 127 | integer, intent(in) :: ngrid |
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| 128 | |
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| 129 | allocate(dust_rad_adjust_prev(ngrid)) |
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| 130 | allocate(dust_rad_adjust_next(ngrid)) |
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| 131 | |
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| 132 | end subroutine ini_dust_rad_adjust_mod |
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| 133 | |
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| 134 | subroutine end_dust_rad_adjust_mod |
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| 135 | |
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| 136 | implicit none |
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| 137 | |
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| 138 | if (allocated(dust_rad_adjust_prev)) deallocate(dust_rad_adjust_prev) |
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| 139 | if (allocated(dust_rad_adjust_next)) deallocate(dust_rad_adjust_next) |
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| 140 | |
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| 141 | end subroutine end_dust_rad_adjust_mod |
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| 142 | |
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| 143 | end module dust_rad_adjust_mod |
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