| 1 | MODULE compute_dtau_mod |
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| 2 | |
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| 3 | IMPLICIT NONE |
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| 4 | |
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| 5 | REAL,PARAMETER :: ti_injection=10/24. ! time of beginning injection |
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| 6 | REAL,PARAMETER :: tf_injection=18/24. ! time of end injection |
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| 7 | REAL,PARAMETER :: t_scenario=14/24. ! time of tauref_scenario |
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| 8 | |
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| 9 | CONTAINS |
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| 10 | |
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| 11 | SUBROUTINE compute_dtau(ngrid,nlayer, & |
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| 12 | & zday,pplev,tauref, & |
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| 13 | & ptimestep,dustliftday,local_time) |
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| 14 | |
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| 15 | USE geometry_mod, only: longitude_deg |
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| 16 | USE time_phylmdz_mod, only: dtphys, daysec |
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| 17 | USE comcstfi_h, only: g |
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| 18 | USE tracer_mod, only: alpha_lift,igcm_dust_mass,igcm_dust_number |
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| 19 | |
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| 20 | IMPLICIT NONE |
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| 21 | |
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| 22 | include "callkeys.h" |
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| 23 | |
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| 24 | INTEGER, INTENT(in) :: ngrid |
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| 25 | INTEGER, INTENT(in) :: nlayer |
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| 26 | REAL, INTENT(in) :: zday ! date at lon=0, in fraction of sols |
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| 27 | REAL, INTENT(in) :: pplev(ngrid,nlayer+1) ! pressure (Pa) |
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| 28 | REAL, INTENT(in) :: tauref(ngrid) ! Computed dust opacity at 610Pa |
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| 29 | REAL, INTENT(in) :: ptimestep |
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| 30 | REAL, INTENT(in) :: local_time(ngrid) |
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| 31 | REAL, INTENT(out) :: dustliftday(ngrid) ! Dust injection rate (s-1) |
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| 32 | |
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| 33 | INTEGER :: ig, l |
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| 34 | INTEGER, SAVE :: nb_daystep ! nomber of step a day |
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| 35 | REAL :: tauref_scenario(ngrid) ! from dust scenario |
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| 36 | REAL :: zday_scenario |
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| 37 | REAL,ALLOCATABLE,SAVE :: local_time_prev(:) |
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| 38 | REAL,ALLOCATABLE,SAVE :: dtau(:) ! Dust opacity increment (at 610Pa) |
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| 39 | REAL,PARAMETER :: odpref=610. !DOD reference pressure (Pa) |
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| 40 | |
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| 41 | LOGICAL, SAVE :: firstcall=.TRUE. ! signals first call to physics |
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| 42 | |
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| 43 | |
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| 44 | IF(firstcall)THEN |
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| 45 | ALLOCATE(local_time_prev(ngrid)) |
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| 46 | ALLOCATE(dtau(ngrid)) |
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| 47 | DO ig=1,ngrid |
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| 48 | local_time_prev(ig)=modulo(1.+(zday-ptimestep/daysec)& |
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| 49 | -INT(zday-ptimestep/daysec) & |
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| 50 | +(longitude_deg(ig)/15)/24,1.) |
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| 51 | dtau(ig)=0. |
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| 52 | ENDDO |
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| 53 | nb_daystep=(daysec/dtphys) |
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| 54 | firstcall=.FALSE. |
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| 55 | ENDIF |
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| 56 | |
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| 57 | ! 1. Obtain tauref_scenario from dust scenario |
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| 58 | zday_scenario=zday-modulo(zday,1.) |
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| 59 | call read_dust_scenario(ngrid,nlayer,zday_scenario,pplev, & |
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| 60 | & tauref_scenario) |
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| 61 | ! for diagnostics |
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| 62 | call WRITEDIAGFI(ngrid,"tauref_scenario","tauref_scenario", & |
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| 63 | & "",2,tauref_scenario) |
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| 64 | |
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| 65 | ! 2. Compute dtau |
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| 66 | DO ig=1,ngrid |
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| 67 | IF ((local_time(ig).ge.t_scenario).and. & |
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| 68 | & (local_time_prev(ig).lt.(t_scenario)))THEN |
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| 69 | dtau(ig)=tauref_scenario(ig)-tauref(ig) |
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| 70 | ENDIF |
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| 71 | IF (dtau(ig).LT.0) THEN |
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| 72 | dtau(ig)=0. |
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| 73 | ENDIF |
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| 74 | |
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| 75 | ! 3. Use dtau to compute dustliftday |
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| 76 | dustliftday(ig)=coeff_injection* & |
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| 77 | & (dtau(ig)*pplev(ig,1)/odpref) & |
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| 78 | & /(daysec*(tf_injection-ti_injection)) |
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| 79 | ENDDO |
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| 80 | |
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| 81 | ! 4. Save local time |
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| 82 | local_time_prev(1:ngrid)=local_time(1:ngrid) |
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| 83 | |
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| 84 | end subroutine compute_dtau |
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| 85 | |
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| 86 | end module compute_dtau_mod |
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