source: trunk/LMDZ.MARS/libf/phymars/dust_scaling_mod.F90

Last change on this file was 2643, checked in by abierjon, 3 years ago

Mars GCM:
Implementation of the IRabs-to-VISext dust scenario conversion, depending on the GCM effective radius :

  • new flag 'reff_driven_IRtoVIS_scenario', false by default, must be set to true to use this dynamic conversion (otherwise, the coefficient takes the constant value of 2.6, eqv to reff=1.5um, as before) A specific line is added in deftank/callphys.def.GCM6
  • this flag requires the 'dustiropacity' to be set to 'tes' to match the IR scenario's wavelength. 'mcs'-like dso diagnostics can only be produced by the use of the post-processing tool util/aeroptical.F90
  • the variable IRtoVIScoef is computed in aeropacity via the GCM CDOD ratio : tau_pref_gcm_VIS/tau_pref_gcm_IR (only at the first call to callradite during each physical timestep)
  • change read_dust_scenario into module read_dust_scenario_mod

AB
File size: 4.0 KB
Line 
1module dust_scaling_mod
2
3implicit none
4
5contains
6
7  subroutine compute_dustscaling(ngrid,nlayer,naerkind,naerdust, &
8                                 zday,pplev, &
9                                 tau_pref_scenario,IRtoVIScoef, &
10                                 tauscaling, &
11                                 dust_rad_adjust,aerosol)
12   
13    use dust_param_mod, only: dustscaling_mode, odpref
14    use dust_rad_adjust_mod, only: compute_dust_rad_adjust
15    use dimradmars_mod, only: iaerdust ! dust aerosol indexes
16   
17    implicit none
18   
19    integer,intent(in) :: ngrid ! number of atmospheric columns
20    integer,intent(in) :: nlayer ! number of atmospheric layers
21    integer,intent(in) :: naerkind ! total number of aerosols
22    integer,intent(in) :: naerdust ! number of dust aerosols
23    real,intent(in) :: zday
24    real,intent(in) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa)
25    real,intent(in) :: tau_pref_scenario(ngrid) ! prescribed visible dust
26                       ! opacity column at odpref reference pressure
27    real,intent(in) :: IRtoVIScoef(ngrid) ! conversion coefficient to apply on
28                                          ! scenario absorption IR (9.3um) CDOD
29                                          ! = tau_pref_gcm_VIS / tau_pref_gcm_IR
30    real,intent(out) :: tauscaling(ngrid) ! dust scaling factor
31    real,intent(inout) :: dust_rad_adjust(ngrid) ! Radiative adjustment
32                          ! factor for dust
33    real,intent(inout) :: aerosol(ngrid,nlayer,naerkind) ! opacities
34   
35    integer :: ig, l , iaer
36    real :: taudust(ngrid)
37    real,save :: zday_prev_call=-666. ! stored value of zday from previous call
38!$OMP THREADPRIVATE(zday_prev_call)
39
40  ! 1. compute/set tauscaling
41
42    if (dustscaling_mode /= 1) then
43      ! simple "freedust" case, no effective rescaling using tauscaling, ever
44      tauscaling(:) = 1
45    endif
46   
47    if (dustscaling_mode == 1) then
48      ! Compute dust column opacity using aerosol() dusts
49      taudust(:) = 0
50      do iaer=1,naerdust ! loop on all dust aerosols
51        do l=1,nlayer
52          do ig=1,ngrid
53              taudust(ig)=taudust(ig)+aerosol(ig,l,iaerdust(iaer))
54          enddo
55        enddo
56      enddo
57
58    elseif (dustscaling_mode == 2) then
59      ! Compute dust column opacity using only background dust
60      taudust(:) = 0
61      do l=1,nlayer
62        do ig=1,ngrid
63            taudust(ig)=taudust(ig)+aerosol(ig,l,iaerdust(1))
64        enddo
65      enddo
66
67    endif ! of if (dustscaling_mode == 1) elseif (dustscaling_mode == 2)
68     
69  ! 2. compute the scaling factors (tauscaling or dust_rad_adjust)
70    if (dustscaling_mode==1) then
71      ! GCM v5.3 style: tauscaling is computed so that
72      ! aerosol() opacities correspond to the prescribed tau_pref_scenario()
73      tauscaling(:)=tau_pref_scenario(:)*pplev(:,1)/odpref/taudust(:)
74    elseif (dustscaling_mode==2) then
75      ! GCM v6 style, compute dust_rad_adjust
76      ! only when this routine is called for the first time
77      ! during this time step
78      if (zday/=zday_prev_call) then
79        call compute_dust_rad_adjust(ngrid,nlayer,zday,pplev, &
80                                     taudust,IRtoVIScoef,     &
81                                     dust_rad_adjust)
82      endif ! of if (zday/=zday_prev_call)
83                                     
84      ! update zday_prev_call
85      zday_prev_call=zday
86    endif
87
88  ! 3. Apply dust aerosol opacities rescaling
89    if (dustscaling_mode <=1) then
90      do iaer=1,naerdust
91        do l=1,nlayer
92          do ig=1,ngrid
93            aerosol(ig,l,iaerdust(iaer)) = max(1E-20, &
94                      aerosol(ig,l,iaerdust(iaer))* tauscaling(ig))
95          enddo
96        enddo
97      enddo
98    else ! duscaling_mode==2, use dust_rad_adjust
99      do iaer=1,naerdust
100        do l=1,nlayer
101          do ig=1,ngrid
102            aerosol(ig,l,iaerdust(iaer)) = max(1E-20, &
103                      aerosol(ig,l,iaerdust(iaer))*dust_rad_adjust(ig))
104          enddo
105        enddo
106      enddo
107    endif
108  end subroutine compute_dustscaling
109
110end module dust_scaling_mod
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