| 1 | subroutine simpleclouds(ngrid,nlay,ptimestep, |
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| 2 | & pplay,pzlay,pt,pdt, |
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| 3 | & pq,pdq,pdqcloud,pdtcloud, |
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| 4 | & nq,tau,rice) |
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| 5 | USE updaterad |
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| 6 | use tracer_mod, only: igcm_h2o_vap, igcm_h2o_ice |
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| 7 | USE comcstfi_h |
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| 8 | use dimradmars_mod, only: naerkind |
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| 9 | implicit none |
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| 10 | c------------------------------------------------------------------ |
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| 11 | c This routine is used to form clouds when a parcel of the GCM is |
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| 12 | c saturated. It is a simplified scheme, and there is almost no |
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| 13 | c microphysics involved. When the air is saturated, water-ice |
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| 14 | c clouds form on a fraction of the dust particles, specified by |
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| 15 | c the constant called "ccn_factor". There is no supersaturation, |
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| 16 | c and no nucleation rates computed. A more accurate scheme can |
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| 17 | c be found in the routine called "improvedclouds.F". |
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| 18 | |
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| 19 | c Modif de zq si saturation dans l'atmosphere |
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| 20 | c si zq(ig,l)> zqsat(ig,l) -> zq(ig,l)=zqsat(ig,l) |
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| 21 | c Le test est effectue de bas en haut. L'eau condensee |
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| 22 | c (si saturation) est remise dans la couche en dessous. |
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| 23 | c L'eau condensee dans la couche du bas est deposee a la surface |
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| 24 | |
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| 25 | c Authors: Franck Montmessin (water ice scheme) |
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| 26 | c Francois Forget (changed nuclei density & outputs) |
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| 27 | c Ehouarn Millour (sept.2008, tracers are now handled |
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| 28 | c by name and not fixed index) |
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| 29 | c J.-B. Madeleine (developed a single routine called |
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| 30 | c simpleclouds.F, and corrected calculations |
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| 31 | c of the typical CCN profile, Oct. 2011) |
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| 32 | c------------------------------------------------------------------ |
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| 33 | #include "callkeys.h" |
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| 34 | |
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| 35 | c------------------------------------------------------------------ |
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| 36 | c Arguments: |
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| 37 | c --------- |
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| 38 | c Inputs: |
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| 39 | INTEGER ngrid,nlay |
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| 40 | integer nq ! nombre de traceurs |
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| 41 | REAL ptimestep ! pas de temps physique (s) |
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| 42 | REAL pplay(ngrid,nlay) ! pression au milieu des couches (Pa) |
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| 43 | REAL pzlay(ngrid,nlay) ! altitude at the middle of the layers |
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| 44 | REAL pt(ngrid,nlay) ! temperature at the middle of the |
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| 45 | ! layers (K) |
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| 46 | REAL pdt(ngrid,nlay) ! tendance temperature des autres |
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| 47 | ! param. |
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| 48 | real pq(ngrid,nlay,nq) ! traceur (kg/kg) |
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| 49 | real pdq(ngrid,nlay,nq) ! tendance avant condensation |
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| 50 | ! (kg/kg.s-1) |
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| 51 | REAL tau(ngrid,naerkind) ! Column dust optical depth at each point |
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| 52 | |
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| 53 | c Output: |
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| 54 | REAL rice(ngrid,nlay) ! Ice mass mean radius (m) |
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| 55 | ! (r_c in montmessin_2004) |
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| 56 | real pdqcloud(ngrid,nlay,nq) ! tendance de la condensation |
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| 57 | ! H2O(kg/kg.s-1) |
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| 58 | REAL pdtcloud(ngrid,nlay) ! tendance temperature due |
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| 59 | ! a la chaleur latente |
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| 60 | |
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| 61 | c------------------------------------------------------------------ |
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| 62 | c Local variables: |
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| 63 | |
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| 64 | REAL rhocloud(ngrid,nlay) ! Cloud density (kg.m-3) |
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| 65 | |
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| 66 | INTEGER ig,l |
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| 67 | |
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| 68 | REAL zq(ngrid,nlay,nq) ! local value of tracers |
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| 69 | REAL zq0(ngrid,nlay,nq) ! local initial value of tracers |
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| 70 | REAL zt(ngrid,nlay) ! local value of temperature |
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| 71 | REAL zqsat(ngrid,nlay) ! saturation |
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| 72 | REAL*8 dzq ! masse de glace echangee (kg/kg) |
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| 73 | REAL lw !Latent heat of sublimation (J.kg-1) |
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| 74 | REAL,PARAMETER :: To=273.15 ! reference temperature, T=273.15 K |
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| 75 | real rdusttyp(ngrid,nlay) ! Typical dust geom. mean radius (m) |
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| 76 | REAL ccntyp(ngrid,nlay) |
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| 77 | ! Typical dust number density (#/kg) |
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| 78 | c CCN reduction factor |
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| 79 | c REAL, PARAMETER :: ccn_factor = 4.5 !! comme TESTS_JB // 1. avant |
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| 80 | |
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| 81 | |
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| 82 | c----------------------------------------------------------------------- |
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| 83 | c 1. initialisation |
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| 84 | c ----------------- |
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| 85 | |
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| 86 | c On "update" la valeur de q(nq) (water vapor) et temperature. |
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| 87 | c On effectue qqes calculs preliminaires sur les couches : |
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| 88 | |
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| 89 | do l=1,nlay |
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| 90 | do ig=1,ngrid |
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| 91 | zq(ig,l,igcm_h2o_vap)= |
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| 92 | & pq(ig,l,igcm_h2o_vap)+pdq(ig,l,igcm_h2o_vap)*ptimestep |
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| 93 | zq(ig,l,igcm_h2o_vap)=max(zq(ig,l,igcm_h2o_vap),1.E-30) ! FF 12/2004 |
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| 94 | zq0(ig,l,igcm_h2o_vap)=zq(ig,l,igcm_h2o_vap) |
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| 95 | zt(ig,l)=pt(ig,l)+ pdt(ig,l)*ptimestep |
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| 96 | |
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| 97 | zq(ig,l,igcm_h2o_ice)= |
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| 98 | & pq(ig,l,igcm_h2o_ice)+pdq(ig,l,igcm_h2o_ice)*ptimestep |
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| 99 | zq(ig,l,igcm_h2o_ice)=max(zq(ig,l,igcm_h2o_ice),0.) ! FF 12/2004 |
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| 100 | zq0(ig,l,igcm_h2o_ice)=zq(ig,l,igcm_h2o_ice) |
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| 101 | enddo |
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| 102 | enddo |
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| 103 | |
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| 104 | |
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| 105 | pdqcloud(1:ngrid,1:nlay,1:nq)=0 |
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| 106 | pdtcloud(1:ngrid,1:nlay)=0 |
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| 107 | |
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| 108 | c ---------------------------------------------- |
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| 109 | c |
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| 110 | c |
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| 111 | c Rapport de melange a saturation dans la couche l : ------- |
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| 112 | c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 113 | |
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| 114 | call watersat(ngrid*nlay,zt,pplay,zqsat) |
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| 115 | |
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| 116 | c taux de condensation (kg/kg/s-1) dans les differentes couches |
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| 117 | c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 118 | |
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| 119 | do l=1,nlay |
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| 120 | do ig=1,ngrid |
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| 121 | |
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| 122 | if (zq(ig,l,igcm_h2o_vap).ge.zqsat(ig,l))then ! Condensation |
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| 123 | dzq=zq(ig,l,igcm_h2o_vap)-zqsat(ig,l) |
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| 124 | elseif(zq(ig,l,igcm_h2o_vap).lt.zqsat(ig,l))then ! Sublimation |
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| 125 | dzq=-min(zqsat(ig,l)-zq(ig,l,igcm_h2o_vap), |
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| 126 | & zq(ig,l,igcm_h2o_ice)) |
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| 127 | endif |
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| 128 | |
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| 129 | c Water Mass change |
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| 130 | c ~~~~~~~~~~~~~~~~~ |
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| 131 | zq(ig,l,igcm_h2o_ice)=zq(ig,l,igcm_h2o_ice)+dzq |
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| 132 | zq(ig,l,igcm_h2o_vap)=zq(ig,l,igcm_h2o_vap)-dzq |
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| 133 | |
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| 134 | |
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| 135 | enddo ! of do ig=1,ngrid |
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| 136 | enddo ! of do l=1,nlay |
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| 137 | |
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| 138 | c Tendance finale |
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| 139 | c ~~~~~~~~~~~~~~~ |
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| 140 | do l=1, nlay |
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| 141 | do ig=1,ngrid |
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| 142 | pdqcloud(ig,l,igcm_h2o_vap)=(zq(ig,l,igcm_h2o_vap) |
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| 143 | & -zq0(ig,l,igcm_h2o_vap))/ptimestep |
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| 144 | pdqcloud(ig,l,igcm_h2o_ice) = |
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| 145 | & (zq(ig,l,igcm_h2o_ice) - zq0(ig,l,igcm_h2o_ice))/ptimestep |
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| 146 | lw=(2834.3-0.28*(zt(ig,l)-To)-0.004*(zt(ig,l)-To)**2)*1.e+3 |
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| 147 | pdtcloud(ig,l)=-pdqcloud(ig,l,igcm_h2o_vap)*lw/cpp |
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| 148 | end do |
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| 149 | end do |
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| 150 | |
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| 151 | c ice crystal radius |
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| 152 | do l=1, nlay |
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| 153 | do ig=1,ngrid |
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| 154 | call updaterice_typ(zq(ig,l,igcm_h2o_ice), |
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| 155 | & tau(ig,1),pzlay(ig,l),rice(ig,l)) |
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| 156 | end do |
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| 157 | end do |
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| 158 | |
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| 159 | c------------------------------------------------------------------ |
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| 160 | return |
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| 161 | end |
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