| 1 | module dust_scaling_mod |
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| 2 | |
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| 3 | implicit none |
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| 4 | |
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| 5 | contains |
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| 6 | |
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| 7 | subroutine compute_dustscaling(ngrid,nlayer,naerkind,naerdust, & |
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| 8 | zday,pplev, & |
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| 9 | tau_pref_scenario,tauscaling, & |
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| 10 | dust_rad_adjust,aerosol) |
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| 11 | |
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| 12 | use dust_param_mod, only: dustscaling_mode, odpref |
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| 13 | use dust_rad_adjust_mod, only: compute_dust_rad_adjust |
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| 14 | use dimradmars_mod, only: iaerdust ! dust aerosol indexes |
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| 15 | |
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| 16 | implicit none |
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| 17 | |
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| 18 | integer,intent(in) :: ngrid ! number of atmospheric columns |
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| 19 | integer,intent(in) :: nlayer ! number of atmospheric layers |
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| 20 | integer,intent(in) :: naerkind ! total number of aerosols |
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| 21 | integer,intent(in) :: naerdust ! number of dust aerosols |
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| 22 | real,intent(in) :: zday |
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| 23 | real,intent(in) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa) |
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| 24 | real,intent(in) :: tau_pref_scenario(ngrid) ! prescribed visible dust |
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| 25 | ! opacity column at odpref reference pressure |
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| 26 | real,intent(out) :: tauscaling(ngrid) ! dust scaling factor |
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| 27 | real,intent(inout) :: dust_rad_adjust(ngrid) ! Radiative adjustment |
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| 28 | ! factor for dust |
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| 29 | real,intent(inout) :: aerosol(ngrid,nlayer,naerkind) ! opacities |
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| 30 | |
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| 31 | integer :: ig, l , iaer |
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| 32 | real :: taudust(ngrid) |
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| 33 | real,save :: zday_prev_call=-666. ! stored value of zday from previous call |
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| 34 | !$OMP THREADPRIVATE(zday_prev_call) |
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| 35 | |
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| 36 | ! 1. compute/set tauscaling |
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| 37 | |
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| 38 | if (dustscaling_mode /= 1) then |
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| 39 | ! simple "freedust" case, no effective rescaling using tauscaling, ever |
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| 40 | tauscaling(:) = 1 |
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| 41 | endif |
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| 42 | |
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| 43 | if (dustscaling_mode == 1) then |
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| 44 | ! Compute dust column opacity using aerosol() dusts |
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| 45 | taudust(:) = 0 |
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| 46 | do iaer=1,naerdust ! loop on all dust aerosols |
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| 47 | do l=1,nlayer |
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| 48 | do ig=1,ngrid |
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| 49 | taudust(ig)=taudust(ig)+aerosol(ig,l,iaerdust(iaer)) |
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| 50 | enddo |
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| 51 | enddo |
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| 52 | enddo |
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| 53 | |
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| 54 | elseif (dustscaling_mode == 2) then |
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| 55 | ! Compute dust column opacity using only background dust |
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| 56 | taudust(:) = 0 |
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| 57 | do l=1,nlayer |
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| 58 | do ig=1,ngrid |
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| 59 | taudust(ig)=taudust(ig)+aerosol(ig,l,iaerdust(1)) |
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| 60 | enddo |
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| 61 | enddo |
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| 62 | |
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| 63 | endif ! of if (dustscaling_mode == 1) elseif (dustscaling_mode == 2) |
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| 64 | |
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| 65 | ! 2. compute the scaling factors (tauscaling or dust_rad_adjust) |
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| 66 | if (dustscaling_mode==1) then |
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| 67 | ! GCM v5.3 style: tauscaling is computed so that |
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| 68 | ! aerosol() opacities correspond to the prescribed tau_pref_scenario() |
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| 69 | tauscaling(:)=tau_pref_scenario(:)*pplev(:,1)/odpref/taudust(:) |
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| 70 | elseif (dustscaling_mode==2) then |
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| 71 | ! GCM v6 style, compute dust_rad_adjust |
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| 72 | ! only when this routine is called for the first time |
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| 73 | ! during this time step |
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| 74 | if (zday/=zday_prev_call) then |
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| 75 | call compute_dust_rad_adjust(ngrid,nlayer,zday,pplev, & |
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| 76 | taudust,dust_rad_adjust) |
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| 77 | endif ! of if (zday/=zday_prev_call) |
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| 78 | |
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| 79 | ! update zday_prev_call |
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| 80 | zday_prev_call=zday |
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| 81 | endif |
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| 82 | |
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| 83 | ! 3. Apply dust aerosol opacities rescaling |
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| 84 | if (dustscaling_mode <=1) then |
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| 85 | do iaer=1,naerdust |
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| 86 | do l=1,nlayer |
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| 87 | do ig=1,ngrid |
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| 88 | aerosol(ig,l,iaerdust(iaer)) = max(1E-20, & |
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| 89 | aerosol(ig,l,iaerdust(iaer))* tauscaling(ig)) |
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| 90 | enddo |
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| 91 | enddo |
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| 92 | enddo |
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| 93 | else ! duscaling_mode==2, use dust_rad_adjust |
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| 94 | do iaer=1,naerdust |
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| 95 | do l=1,nlayer |
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| 96 | do ig=1,ngrid |
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| 97 | aerosol(ig,l,iaerdust(iaer)) = max(1E-20, & |
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| 98 | aerosol(ig,l,iaerdust(iaer))*dust_rad_adjust(ig)) |
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| 99 | enddo |
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| 100 | enddo |
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| 101 | enddo |
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| 102 | endif |
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| 103 | end subroutine compute_dustscaling |
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| 104 | |
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| 105 | end module dust_scaling_mod |
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