| 1 | SUBROUTINE ch4cloud(ngrid,nlay,naersize, ptimestep, |
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| 2 | & pplev,pplay,pdpsrf,pzlev,pzlay,pt,pdt, |
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| 3 | & pq,pdq,pdqcloud,pdqscloud,pdtcloud, |
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| 4 | & nq,rice_ch4) |
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| 5 | |
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| 6 | use comgeomfi_h |
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| 7 | IMPLICIT NONE |
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| 8 | |
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| 9 | c======================================================================= |
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| 10 | c Treatment of saturation of METHANE |
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| 11 | c |
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| 12 | c |
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| 13 | c Modif de zq si saturation dans l'atmosphere |
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| 14 | c si zq(ig,l)> zqsat(ig,l) -> zq(ig,l)=zqsat(ig,l) |
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| 15 | c Le test est effectue de bas en haut. CH4 condensee |
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| 16 | c (si saturation) est remise dans la couche en dessous. |
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| 17 | c Le methane condensee dans la couche du bas est deposee a la surface |
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| 18 | c |
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| 19 | c Melanie Vangvichith (adapted from Mars water clouds) |
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| 20 | c Tanguy Bertrand |
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| 21 | c Completely rewritten by Francois Forget (to properly estimate the |
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| 22 | c latent heat release. |
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| 23 | c |
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| 24 | c======================================================================= |
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| 25 | |
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| 26 | c----------------------------------------------------------------------- |
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| 27 | c declarations: |
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| 28 | c ------------- |
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| 29 | |
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| 30 | #include "dimensions.h" |
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| 31 | #include "dimphys.h" |
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| 32 | #include "comcstfi.h" |
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| 33 | #include "callkeys.h" |
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| 34 | #include "tracer.h" |
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| 35 | |
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| 36 | c Inputs: |
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| 37 | c ------ |
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| 38 | |
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| 39 | INTEGER ngrid,nlay |
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| 40 | REAL ptimestep ! pas de temps physique (s) |
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| 41 | REAL pplev(ngrid,nlay+1) ! pression aux inter-couches (Pa) |
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| 42 | REAL pplay(ngrid,nlay) ! pression au milieu des couches (Pa) |
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| 43 | REAL pdpsrf(ngrid) ! tendance surf pressure |
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| 44 | REAL pzlev(ngrid,nlay+1) ! altitude at layer boundaries |
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| 45 | REAL pzlay(ngrid,nlay) ! altitude at the middle of the layers |
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| 46 | REAL pt(ngrid,nlay) ! temperature at the middle of the layers (K) |
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| 47 | REAL pdt(ngrid,nlay) ! tendance temperature des autres param. |
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| 48 | |
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| 49 | real pq(ngrid,nlay,nq) ! traceur (kg/kg) |
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| 50 | real pdq(ngrid,nlay,nq) ! tendance avant condensation (kg/kg.s-1) |
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| 51 | integer naersize ! nombre de traceurs radiativement actifs (=naerkind) |
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| 52 | integer nq ! nombre de traceurs |
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| 53 | |
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| 54 | c Outputs: |
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| 55 | c ------- |
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| 56 | |
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| 57 | real pdqcloud(ngrid,nlay,nq) ! tendance de la condensation CH4(kg/kg.s-1) |
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| 58 | real pdqscloud(ngrid,nq) ! flux en surface (kg.m-2.s-1) |
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| 59 | REAL pdtcloud(ngrid,nlay) ! tendance temperature due |
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| 60 | ! a la chaleur latente |
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| 61 | REAL rice_ch4(ngrid,nlay) ! CH4 Ice mass mean radius (m) |
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| 62 | ! (r_c in montmessin_2004) |
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| 63 | |
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| 64 | c local: |
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| 65 | c ------ |
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| 66 | c REAL Nmix ! Cloud condensation nuclei |
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| 67 | c parameter (Nmix=1.E5) ! /kg |
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| 68 | real rnuclei ! Nuclei geometric mean radius (m) |
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| 69 | parameter (rnuclei=2.E-7) ! m |
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| 70 | |
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| 71 | REAL CBRT |
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| 72 | EXTERNAL CBRT |
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| 73 | INTEGER ig,l |
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| 74 | |
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| 75 | |
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| 76 | REAL zq(ngridmx,nlayermx,nqmx) ! local value of tracers |
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| 77 | REAL zqsat(ngridmx,nlayermx) ! saturation |
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| 78 | REAL zt(ngridmx,nlayermx) ! local value of temperature |
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| 79 | |
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| 80 | REAL vecnull(ngridmx*nlayermx) |
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| 81 | |
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| 82 | LOGICAL,SAVE :: firstcall=.true. |
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| 83 | |
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| 84 | ! indexes of methane gas, methane ice and dust tracers: |
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| 85 | INTEGER,SAVE :: i_ch4=0 ! methane gas |
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| 86 | INTEGER,SAVE :: i_ice=0 ! methane ice |
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| 87 | |
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| 88 | REAL Tfin,qch4_fin |
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| 89 | REAL temp_fin ! function used to compute Tfin at the end of the timestep |
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| 90 | |
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| 91 | c TEMPORAIRE : |
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| 92 | |
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| 93 | real pdtcloudmax,pdtcloudmin |
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| 94 | integer igmin, igmax,lmin,lmax |
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| 95 | |
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| 96 | |
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| 97 | |
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| 98 | c ** un petit test de coherence |
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| 99 | c -------------------------- |
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| 100 | |
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| 101 | IF (firstcall) THEN |
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| 102 | IF(ngrid.NE.ngridmx) THEN |
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| 103 | PRINT*,'STOP dans ch4cloud' |
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| 104 | PRINT*,'probleme de dimensions :' |
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| 105 | PRINT*,'ngrid =',ngrid |
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| 106 | PRINT*,'ngridmx =',ngridmx |
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| 107 | STOP |
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| 108 | ENDIF |
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| 109 | |
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| 110 | if (nq.gt.nqmx) then |
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| 111 | write(*,*) 'stop in ch4cloud (nq.gt.nqmx)!' |
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| 112 | write(*,*) 'nq=',nq,' nqmx=',nqmx |
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| 113 | stop |
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| 114 | endif |
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| 115 | |
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| 116 | i_ch4=igcm_ch4_gas |
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| 117 | i_ice=igcm_ch4_ice |
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| 118 | |
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| 119 | write(*,*) "methanecloud: i_ch4=",i_ch4 |
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| 120 | write(*,*) " i_ice=",i_ice |
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| 121 | |
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| 122 | firstcall=.false. |
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| 123 | ENDIF ! of IF (firstcall) |
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| 124 | |
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| 125 | |
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| 126 | c----------------------------------------------------------------------- |
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| 127 | c 1. initialisation |
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| 128 | c ----------------- |
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| 129 | |
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| 130 | c On "update" la valeur de q(nqmx) (methane vapor) et temperature. |
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| 131 | c On effectue qqes calculs preliminaires sur les couches : |
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| 132 | |
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| 133 | do l=1,nlay |
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| 134 | do ig=1,ngrid |
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| 135 | zt(ig,l)=pt(ig,l)+ pdt(ig,l)*ptimestep |
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| 136 | zq(ig,l,i_ch4)=pq(ig,l,i_ch4)+pdq(ig,l,i_ch4)*ptimestep |
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| 137 | zq(ig,l,i_ch4)=max(zq(ig,l,i_ch4),1.E-30) |
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| 138 | zq(ig,l,i_ice)=pq(ig,l,i_ice)+pdq(ig,l,i_ice)*ptimestep |
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| 139 | zq(ig,l,i_ice)=max(zq(ig,l,i_ice),0.) |
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| 140 | enddo |
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| 141 | enddo |
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| 142 | |
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| 143 | pdqscloud(1:ngrid,1:nq)=0 |
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| 144 | pdqcloud(1:ngrid,1:nlay,1:nq)=0 |
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| 145 | pdtcloud(1:ngrid,1:nlay)=0 |
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| 146 | |
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| 147 | c ---------------------------------------------- |
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| 148 | c |
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| 149 | c |
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| 150 | c q à saturation dans la couche l à temperature prédite zt |
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| 151 | c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 152 | call methanesat(ngridmx*nlayermx,zt,pplay,zqsat,vecnull) |
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| 153 | |
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| 154 | |
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| 155 | c Loop to work where CH4 condensation/sublimation is occuring |
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| 156 | c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 157 | do l=1,nlay |
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| 158 | do ig=1,ngrid |
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| 159 | if ((zq(ig,l,i_ch4).gt.zqsat(ig,l)).or. |
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| 160 | & (zq(ig,l,i_ice).gt.1.E-10) ) then ! phase change |
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| 161 | |
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| 162 | if(zq(ig,l,i_ice).lt.(zqsat(ig,l)-zq(ig,l,i_ch4))) then |
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| 163 | !case when everything is sublimed: |
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| 164 | qch4_fin = zq(ig,l,i_ch4) + zq(ig,l,i_ice) |
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| 165 | Tfin = zt(ig,l) - (qch4_fin-zq(ig,l,i_ch4))*lw_ch4/cpp |
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| 166 | else |
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| 167 | !case when CH4 ice is present at the end |
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| 168 | qch4_fin = zqsat(ig,l) |
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| 169 | Tfin = zt(ig,l) - (qch4_fin-zq(ig,l,i_ch4))*lw_ch4/cpp |
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| 170 | if(abs(Tfin-zt(ig,l)).gt.1.) then |
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| 171 | ! Improved calculation if the temperature change is significant (1K?) |
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| 172 | |
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| 173 | c Estimating the temperature Tfin and condensation at the end of the |
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| 174 | c timestep due to condensation-sublimation process, taking into acount |
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| 175 | c latent heat, given by: Tfin - zt = (zq - qsat(Tfin))*L/cp |
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| 176 | c Tfin, solution, of the equation, is estimated by iteration |
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| 177 | c We assume that improved Tfin is between zt and the 1st estimation of Tfin: |
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| 178 | Tfin = temp_fin(zt(ig,l),Tfin,0.01,pplay(ig,l), |
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| 179 | & zt(ig,l),zq(ig,l,i_ch4),qch4_fin) |
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| 180 | c Security check for small changes |
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| 181 | if(abs(zq(ig,l,i_ch4)-qch4_fin).gt. |
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| 182 | & abs(zq(ig,l,i_ch4)- zqsat(ig,l)) ) then |
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| 183 | write(*,*) "warning: inaccuracy in CH4 clouds" |
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| 184 | write(*,*) 'zq(ig,l,i_ch4),qch4_fin, zqsat(ig,l)', |
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| 185 | & zq(ig,l,i_ch4),qch4_fin, zqsat(ig,l) |
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| 186 | |
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| 187 | qch4_fin = zqsat(ig,l) |
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| 188 | |
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| 189 | end if |
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| 190 | end if |
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| 191 | end if |
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| 192 | c Final tendancies |
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| 193 | pdqcloud(ig,l,i_ch4)=(qch4_fin-zq(ig,l,i_ch4))/ptimestep |
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| 194 | |
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| 195 | !TB16 |
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| 196 | IF (zq(ig,l,i_ch4)+pdqcloud(ig,l,i_ch4)*ptimestep.lt.0.) |
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| 197 | & then |
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| 198 | pdqcloud(ig,l,i_ch4)=-zq(ig,l,i_ch4)/ptimestep |
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| 199 | END IF |
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| 200 | |
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| 201 | pdqcloud(ig,l,i_ice) = - pdqcloud(ig,l,i_ch4) |
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| 202 | pdtcloud(ig,l)=(Tfin - zt(ig,l))/ptimestep |
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| 203 | |
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| 204 | c Ice particle radius |
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| 205 | zq(ig,l,i_ice)= |
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| 206 | & zq(ig,l,i_ice)+pdqcloud(ig,l,i_ice)*ptimestep |
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| 207 | rice_ch4(ig,l)=max( CBRT ( (zq(ig,l,i_ice)/rho_ch4_ice |
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| 208 | & +Nmix_ch4*(4./3.)*pi*rnuclei**3.)/(Nmix_ch4*4./3.*pi)), |
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| 209 | & rnuclei) |
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| 210 | end if |
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| 211 | enddo ! of do ig=1,ngrid |
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| 212 | enddo ! of do l=1,nlay |
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| 213 | |
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| 214 | c A correction if a lot of subliming N2 fills the 1st layer FF04/2005 |
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| 215 | c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 216 | c Then that should not affect the ice particle radius |
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| 217 | do ig=1,ngridmx |
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| 218 | if(pdpsrf(ig)*ptimestep.gt.0.9*(pplev(ig,1)-pplev(ig,2)))then |
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| 219 | if(pdpsrf(ig)*ptimestep.gt.0.9*(pplev(ig,1)-pplev(ig,3))) |
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| 220 | & rice_ch4(ig,2)=rice_ch4(ig,3) |
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| 221 | rice_ch4(ig,1)=rice_ch4(ig,2) |
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| 222 | end if |
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| 223 | end do |
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| 224 | |
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| 225 | c************ ANALYSE pour Icarus **************** |
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| 226 | c |
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| 227 | c pdtcloudmax =0. |
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| 228 | c pdtcloudmin =0. |
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| 229 | c igmin=999 |
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| 230 | c igmax=999 |
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| 231 | c lmin =999 |
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| 232 | c lmax =999 |
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| 233 | c do l=1, nlay |
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| 234 | c do ig=1,ngridmx |
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| 235 | c if(pdtcloud(ig,l).gt.pdtcloudmax) then |
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| 236 | c igmax=ig |
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| 237 | c lmax = l |
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| 238 | c pdtcloudmax=pdtcloud(ig,l) |
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| 239 | c else if(pdtcloud(ig,l).lt.pdtcloudmin) then |
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| 240 | c igmin=ig |
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| 241 | c lmin = l |
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| 242 | c pdtcloudmin=pdtcloud(ig,l) |
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| 243 | c end if |
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| 244 | c end do |
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| 245 | c end do |
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| 246 | c |
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| 247 | c write(*,*) |
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| 248 | c write(*,*) "MAX , ig, l, Tbefore, Tafter, Tfin_ini" |
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| 249 | c write(*,*) igmax,lmax, zt(igmax,lmax), |
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| 250 | c & zt(igmax,lmax)+ pdtcloud(igmax,lmax)*ptimestep, |
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| 251 | c &zt(igmax,lmax)-(zqsat(igmax,lmax)-zq(igmax,lmax,i_ch4))*lw_ch4/cpp |
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| 252 | c write(*,*) "MAX , Qch4gas_before, Qch4gas_after, Qsat ini" |
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| 253 | c write(*,*) pq(igmax,lmax,i_ch4)+pdq(igmax,lmax,i_ch4)*ptimestep, |
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| 254 | c & pq(igmax,lmax,i_ch4)+ |
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| 255 | c & (pdq(igmax,lmax,i_ch4)+ pdqcloud(igmax,lmax,i_ch4))*ptimestep |
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| 256 | c & ,zqsat(igmax,lmax) |
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| 257 | c write(*,*) "MAX , Qch4ice_before, Qch4ice_after" |
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| 258 | c write(*,*) pq(igmax,lmax,i_ice)+pdq(igmax,lmax,i_ice)*ptimestep, |
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| 259 | c & pq(igmax,lmax,i_ice)+ |
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| 260 | c & (pdq(igmax,lmax,i_ice)+ pdqcloud(igmax,lmax,i_ice))*ptimestep |
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| 261 | c write(*,*) 'Rice=', rice_ch4(igmax,lmax) |
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| 262 | c |
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| 263 | c write(*,*) |
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| 264 | c write(*,*) "MIN , ig, l, Tbefore, Tafter, Tfin_ini" |
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| 265 | c write(*,*) igmin,lmin, zt(igmin,lmin), |
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| 266 | c & zt(igmin,lmin)+ pdtcloud(igmin,lmin)*ptimestep, |
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| 267 | c &zt(igmin,lmin)-(zqsat(igmin,lmin)-zq(igmin,lmin,i_ch4))*lw_ch4/cpp |
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| 268 | c write(*,*) "MIN , Qch4gas_before, Qch4gas_after, Qsat ini" |
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| 269 | c write(*,*) pq(igmin,lmin,i_ch4)+pdq(igmin,lmin,i_ch4)*ptimestep, |
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| 270 | c & pq(igmin,lmin,i_ch4)+ |
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| 271 | c & (pdq(igmin,lmin,i_ch4)+ pdqcloud(igmin,lmin,i_ch4))*ptimestep |
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| 272 | c & ,zqsat(igmin,lmin) |
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| 273 | c write(*,*) "MIN , Qch4ice_before, Qch4ice_after" |
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| 274 | c write(*,*) pq(igmin,lmin,i_ice)+pdq(igmin,lmin,i_ice)*ptimestep, |
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| 275 | c & pq(igmin,lmin,i_ice)+ |
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| 276 | c & (pdq(igmin,lmin,i_ice)+ pdqcloud(igmin,lmin,i_ice))*ptimestep |
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| 277 | c write(*,*) 'Rice=', rice_ch4(igmin,lmin) |
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| 278 | c write(*,*) "pdtcloud(igmin,lmin) " , pdtcloud(igmin,lmin) |
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| 279 | c write(*,*) "pdqcloud(i_ch4)", pdqcloud(igmin,lmin,i_ch4) |
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| 280 | c write(*,*) "pdqcloud(i_ice)", pdqcloud(igmin,lmin,i_ice) |
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| 281 | c |
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| 282 | |
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| 283 | c************ FIN ANALYSE pour Icarus **************** |
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| 284 | |
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| 285 | c************************************************** |
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| 286 | c Output --- removed |
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| 287 | c************************************************** |
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| 288 | ! NB: for diagnostics use zq(), the updated value of tracers |
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| 289 | c Computing ext visible optical depth in each layer |
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| 290 | |
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| 291 | RETURN |
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| 292 | END |
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| 293 | |
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| 294 | !================================================================================ |
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| 295 | |
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| 296 | FUNCTION temp_fin(X1,X2,XACC,pres,temp,zq,qsat) |
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| 297 | implicit none |
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| 298 | #include "dimensions.h" |
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| 299 | #include "dimphys.h" |
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| 300 | #include "comcstfi.h" |
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| 301 | #include "tracer.h" |
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| 302 | real pres, temp, zq,qsat |
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| 303 | real X1,X2,XACC, F |
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| 304 | real FMID,D,temp_fin,DX, XMID |
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| 305 | integer JMAX,J |
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| 306 | real func |
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| 307 | |
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| 308 | PARAMETER (JMAX=40) |
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| 309 | |
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| 310 | call methanesat(1,X2,pres,qsat,0.) |
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| 311 | FMID = X2 -temp -(zq-qsat)*lw_ch4/cpp |
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| 312 | |
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| 313 | call methanesat(1,X1,pres,qsat,0.) |
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| 314 | F = X1 -temp -(zq-qsat)*lw_ch4/cpp |
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| 315 | |
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| 316 | IF(F*FMID.GE.0.) write(*,*) 'Fix Tfin firt guesses in ch4cloud' |
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| 317 | IF(F.LT.0.)THEN |
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| 318 | temp_fin=X1 |
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| 319 | DX=X2-X1 |
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| 320 | ELSE |
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| 321 | temp_fin=X2 |
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| 322 | DX=X1-X2 |
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| 323 | ENDIF |
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| 324 | DO 11 J=1,JMAX |
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| 325 | DX=DX*.5 |
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| 326 | XMID=temp_fin+DX |
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| 327 | |
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| 328 | call methanesat(1,XMID,pres,qsat,0.) |
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| 329 | FMID = XMID -temp -(zq-qsat)*lw_ch4/cpp |
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| 330 | |
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| 331 | IF(FMID.LE.0.)temp_fin=XMID |
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| 332 | IF(ABS(DX).LT.XACC .OR. FMID.EQ.0.) RETURN |
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| 333 | 11 CONTINUE |
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| 334 | ! PAUSE 'too many bisections' |
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| 335 | END |
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| 336 | |
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| 337 | |
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