| 1 | subroutine condens_co2cloud(ngrid,nlayer,nq,ptimestep, & |
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| 2 | pcapcal,pplay,pplev,ptsrf,pt, & |
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| 3 | pphi,pdt,pdu,pdv,pdtsrf,pu,pv,pq,pdq, & |
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| 4 | piceco2,psolaralb,pemisurf, & |
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| 5 | pdtc,pdtsrfc,pdpsrf,pduc,pdvc, & |
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| 6 | pdqc,reffrad,cpp3D) |
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| 7 | |
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| 8 | use radinc_h, only : naerkind |
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| 9 | |
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| 10 | implicit none |
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| 11 | |
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| 12 | !================================================================== |
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| 13 | ! Purpose |
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| 14 | ! ------- |
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| 15 | ! Condense and/or sublime CO2 ice on the ground and in the |
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| 16 | ! atmosphere, and sediment the ice. |
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| 17 | ! |
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| 18 | ! Inputs |
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| 19 | ! ------ |
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| 20 | ! ngrid Number of vertical columns |
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| 21 | ! nlayer Number of layers |
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| 22 | ! pplay(ngrid,nlayer) Pressure layers |
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| 23 | ! pplev(ngrid,nlayer+1) Pressure levels |
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| 24 | ! pt(ngrid,nlayer) Temperature (in K) |
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| 25 | ! ptsrf(ngrid) Surface temperature |
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| 26 | ! |
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| 27 | ! pdt(ngrid,nlayermx) Time derivative before condensation/sublimation of pt |
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| 28 | ! pdtsrf(ngrid) Time derivative before condensation/sublimation of ptsrf |
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| 29 | ! pqsurf(ngrid,nq) Sedimentation flux at the surface (kg.m-2.s-1) |
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| 30 | ! |
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| 31 | ! Outputs |
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| 32 | ! ------- |
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| 33 | ! pdpsrf(ngrid) \ Contribution of condensation/sublimation |
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| 34 | ! pdtc(ngrid,nlayermx) / to the time derivatives of Ps, pt, and ptsrf |
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| 35 | ! pdtsrfc(ngrid) / |
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| 36 | ! |
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| 37 | ! Both |
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| 38 | ! ---- |
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| 39 | ! piceco2(ngrid) CO2 ice at the surface (kg/m2) |
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| 40 | ! psolaralb(ngrid) Albedo at the surface |
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| 41 | ! pemisurf(ngrid) Emissivity of the surface |
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| 42 | ! |
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| 43 | ! Authors |
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| 44 | ! ------- |
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| 45 | ! Francois Forget (1996) |
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| 46 | ! Converted to Fortran 90 and slightly modified by R. Wordsworth (2009) |
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| 47 | ! |
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| 48 | !================================================================== |
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| 49 | |
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| 50 | #include "dimensions.h" |
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| 51 | #include "dimphys.h" |
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| 52 | #include "comcstfi.h" |
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| 53 | #include "surfdat.h" |
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| 54 | #include "comgeomfi.h" |
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| 55 | #include "comvert.h" |
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| 56 | #include "callkeys.h" |
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| 57 | #include "tracer.h" |
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| 58 | #include "gases.h" |
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| 59 | |
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| 60 | !----------------------------------------------------------------------- |
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| 61 | ! Arguments |
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| 62 | |
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| 63 | INTEGER ngrid, nlayer, nq |
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| 64 | |
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| 65 | REAL ptimestep |
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| 66 | REAL pplay(ngrid,nlayer),pplev(ngrid,nlayer+1) |
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| 67 | REAL pcapcal(ngrid) |
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| 68 | REAL pt(ngrid,nlayer) |
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| 69 | REAL ptsrf(ngrid) |
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| 70 | REAL pphi(ngrid,nlayer) |
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| 71 | REAL pdt(ngrid,nlayer),pdtsrf(ngrid),pdtc(ngrid,nlayer) |
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| 72 | REAL pdtsrfc(ngrid),pdpsrf(ngrid) |
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| 73 | ! REAL piceco2(ngrid),psolaralb(ngrid,2),pemisurf(ngrid) |
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| 74 | REAL piceco2(ngrid),psolaralb(ngrid),pemisurf(ngrid) |
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| 75 | |
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| 76 | REAL pu(ngrid,nlayer) , pv(ngrid,nlayer) |
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| 77 | REAL pdu(ngrid,nlayer) , pdv(ngrid,nlayer) |
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| 78 | REAL pduc(ngrid,nlayer) , pdvc(ngrid,nlayer) |
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| 79 | REAL pq(ngridmx,nlayer,nq),pdq(ngrid,nlayer,nq) |
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| 80 | REAL pdqc(ngrid,nlayer,nq), pdqsc(ngrid,nq) |
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| 81 | |
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| 82 | REAL reffrad(ngrid,nlayer,naerkind) |
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| 83 | |
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| 84 | ! Allow variations in cp with location |
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| 85 | REAL cpp3D(ngridmx,nlayermx) ! specific heat capacity at const. pressure |
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| 86 | |
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| 87 | |
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| 88 | |
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| 89 | !----------------------------------------------------------------------- |
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| 90 | ! Local variables |
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| 91 | |
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| 92 | INTEGER l,ig,icap,ilay,it,iq |
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| 93 | |
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| 94 | REAL*8 zt(ngridmx,nlayermx) |
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| 95 | REAL zq(ngridmx,nlayermx,nqmx) |
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| 96 | REAL zcpi |
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| 97 | REAL ztcond (ngridmx,nlayermx) |
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| 98 | REAL ztcondsol(ngridmx) |
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| 99 | REAL zdiceco2(ngridmx) |
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| 100 | REAL zcondicea(ngridmx,nlayermx), zcondices(ngridmx) |
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| 101 | REAL zfallice(ngridmx), Mfallice(ngridmx) |
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| 102 | REAL zmflux(nlayermx+1) |
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| 103 | REAL zu(nlayermx),zv(nlayermx) |
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| 104 | REAL ztsrf(ngridmx) |
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| 105 | REAL ztc(nlayermx), ztm(nlayermx+1) |
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| 106 | REAL zum(nlayermx+1) , zvm(nlayermx+1) |
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| 107 | LOGICAL condsub(ngridmx) |
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| 108 | REAL subptimestep |
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| 109 | Integer Ntime |
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| 110 | real masse (ngridmx,nlayermx), w(ngridmx,nlayermx,nqmx) |
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| 111 | real wq(ngridmx,nlayermx+1) |
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| 112 | real vstokes,reff |
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| 113 | |
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| 114 | ! Special diagnostic variables |
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| 115 | real tconda1(ngridmx,nlayermx) |
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| 116 | real tconda2(ngridmx,nlayermx) |
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| 117 | real zdtsig (ngridmx,nlayermx) |
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| 118 | real zdt (ngridmx,nlayermx) |
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| 119 | |
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| 120 | !----------------------------------------------------------------------- |
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| 121 | ! Saved local variables |
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| 122 | |
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| 123 | REAL emisref(ngridmx) |
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| 124 | REAL latcond |
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| 125 | REAL ccond |
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| 126 | REAL cpice |
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| 127 | SAVE emisref, cpice |
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| 128 | SAVE latcond,ccond |
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| 129 | |
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| 130 | LOGICAL firstcall |
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| 131 | SAVE firstcall |
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| 132 | REAL SSUM |
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| 133 | EXTERNAL SSUM |
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| 134 | |
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| 135 | DATA latcond /5.9e5/ |
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| 136 | DATA cpice /1000./ |
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| 137 | DATA firstcall/.true./ |
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| 138 | |
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| 139 | REAL CBRT |
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| 140 | EXTERNAL CBRT |
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| 141 | |
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| 142 | INTEGER,SAVE :: i_co2ice=0 ! co2 ice |
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| 143 | CHARACTER(LEN=20) :: tracername ! to temporarily store text |
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| 144 | |
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| 145 | integer igas |
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| 146 | integer,save :: igasco2=0 |
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| 147 | character(len=3) :: gasname |
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| 148 | |
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| 149 | real reffradmin, reffradmax |
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| 150 | |
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| 151 | real ppco2 |
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| 152 | |
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| 153 | !----------------------------------------------------------------------- |
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| 154 | ! Initializations |
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| 155 | |
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| 156 | call zerophys(ngrid*nlayer*nq,pdqc) |
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| 157 | call zerophys(ngrid*nlayer*nq,pdtc) |
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| 158 | call zerophys(ngridmx*nlayermx*nqmx,zq) |
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| 159 | call zerophys(ngridmx*nlayermx,zt) |
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| 160 | |
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| 161 | !reffradmin=1.e-7 |
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| 162 | !reffradmax=5.e-4 |
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| 163 | !reffradmin=0.5e-7 |
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| 164 | !reffradmax=0.1e-3 ! FF data |
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| 165 | reffradmin=0.1e-5 |
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| 166 | reffradmax=0.1e-3 ! JB data |
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| 167 | ! improve this in the future... |
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| 168 | |
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| 169 | ! Initialisation |
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| 170 | IF (firstcall) THEN |
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| 171 | |
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| 172 | ! find CO2 ice tracer |
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| 173 | do iq=1,nqmx |
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| 174 | tracername=noms(iq) |
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| 175 | if (tracername.eq."co2_ice") then |
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| 176 | i_co2ice=iq |
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| 177 | endif |
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| 178 | enddo |
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| 179 | |
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| 180 | ! find CO2 gas |
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| 181 | do igas=1,ngasmx |
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| 182 | gasname=gnom(igas) |
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| 183 | ! gasname=noms(igas) ! was a bug |
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| 184 | if (gasname.eq."CO2") then |
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| 185 | igasco2=igas |
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| 186 | endif |
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| 187 | enddo |
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| 188 | |
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| 189 | write(*,*) "condense_co2cloud: i_co2ice=",i_co2ice |
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| 190 | |
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| 191 | if((i_co2ice.lt.1))then |
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| 192 | print*,'In condens_co2cloud but no CO2 ice tracer, exiting.' |
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| 193 | stop |
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| 194 | endif |
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| 195 | |
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| 196 | ccond=cpp/(g*latcond) |
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| 197 | print*,'In condens_co2cloud: ccond=',ccond,' latcond=',latcond |
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| 198 | |
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| 199 | ! Prepare special treatment if gas is not pure CO2 |
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| 200 | !if (addn2) then |
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| 201 | ! m_co2 = 44.01E-3 ! CO2 molecular mass (kg/mol) |
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| 202 | ! m_noco2 = 28.02E-3 ! N2 molecular mass (kg/mol) |
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| 203 | ! Compute A and B coefficient use to compute |
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| 204 | ! mean molecular mass Mair defined by |
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| 205 | ! 1/Mair = q(ico2)/m_co2 + (1-q(ico2))/m_noco2 |
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| 206 | ! 1/Mair = A*q(ico2) + B |
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| 207 | ! A = (1/m_co2 - 1/m_noco2) |
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| 208 | ! B = 1/m_noco2 |
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| 209 | !endif |
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| 210 | |
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| 211 | ! Minimum CO2 mixing ratio below which mixing occurs with layer above: |
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| 212 | !qco2min =0.75 |
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| 213 | |
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| 214 | firstcall=.false. |
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| 215 | ENDIF |
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| 216 | zcpi=1./cpp |
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| 217 | |
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| 218 | !----------------------------------------------------------------------- |
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| 219 | ! Calculation of CO2 condensation / sublimation |
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| 220 | ! |
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| 221 | ! Variables used: |
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| 222 | ! piceco2(ngrid) amount of co2 ice on the ground (kg/m2) |
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| 223 | ! zcondicea(ngrid,l) condensation rate in layer l (kg/m2/s) |
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| 224 | ! zcondices(ngrid) condensation rate on the ground (kg/m2/s) |
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| 225 | ! zfallice(ngrid) flux of ice falling on surface (kg/m2/s) |
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| 226 | ! pdtc(ngrid,nlayermx) dT/dt due to phase changes (K/s) |
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| 227 | |
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| 228 | |
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| 229 | ! Tendencies initially set to 0 (except pdtc) |
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| 230 | DO l=1,nlayer |
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| 231 | DO ig=1,ngrid |
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| 232 | zcondicea(ig,l) = 0. |
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| 233 | pduc(ig,l) = 0 |
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| 234 | pdvc(ig,l) = 0 |
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| 235 | pdqc(ig,l,i_co2ice) = 0 |
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| 236 | END DO |
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| 237 | END DO |
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| 238 | |
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| 239 | DO ig=1,ngrid |
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| 240 | Mfallice(ig) = 0. |
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| 241 | zfallice(ig) = 0. |
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| 242 | zcondices(ig) = 0. |
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| 243 | pdtsrfc(ig) = 0. |
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| 244 | pdpsrf(ig) = 0. |
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| 245 | condsub(ig) = .false. |
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| 246 | zdiceco2(ig) = 0. |
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| 247 | ENDDO |
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| 248 | |
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| 249 | !----------------------------------------------------------------------- |
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| 250 | ! Atmospheric condensation |
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| 251 | |
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| 252 | |
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| 253 | ! Compute CO2 Volume mixing ratio |
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| 254 | ! ------------------------------- |
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| 255 | ! if (addn2) then |
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| 256 | ! DO l=1,nlayer |
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| 257 | ! DO ig=1,ngrid |
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| 258 | ! qco2=pq(ig,l,ico2)+pdq(ig,l,ico2)*ptimestep |
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| 259 | !! Mean air molecular mass = 1/(q(ico2)/m_co2 + (1-q(ico2))/m_noco2) |
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| 260 | ! mmean=1/(A*qco2 +B) |
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| 261 | ! vmr_co2(ig,l) = qco2*mmean/m_co2 |
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| 262 | ! ENDDO |
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| 263 | ! ENDDO |
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| 264 | ! else |
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| 265 | ! DO l=1,nlayer |
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| 266 | ! DO ig=1,ngrid |
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| 267 | ! vmr_co2(ig,l)=0.5 |
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| 268 | ! ENDDO |
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| 269 | ! ENDDO |
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| 270 | ! end if |
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| 271 | |
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| 272 | ! Forecast the atmospheric frost temperature 'ztcond' |
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| 273 | DO l=1,nlayer |
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| 274 | DO ig=1,ngrid |
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| 275 | ppco2=gfrac(igasco2)*pplay(ig,l) |
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| 276 | call get_tcond_co2(ppco2,ztcond(ig,l)) |
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| 277 | ENDDO |
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| 278 | ENDDO |
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| 279 | |
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| 280 | ! Initialize zq and zt at the beginning of the sub-timestep loop |
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| 281 | DO l=1,nlayer |
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| 282 | DO ig=1,ngrid |
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| 283 | zt(ig,l)=pt(ig,l) |
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| 284 | zq(ig,l,i_co2ice)=pq(ig,l,i_co2ice) |
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| 285 | IF( zq(ig,l,i_co2ice).lt.-1.e-6 ) THEN |
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| 286 | print*,'Uh-oh, zq = ',zq(ig,l,i_co2ice),'at ig,l=',ig,l |
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| 287 | if(l.eq.1)then |
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| 288 | print*,'Perhaps the atmosphere is collapsing on surface...?' |
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| 289 | endif |
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| 290 | END IF |
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| 291 | ENDDO |
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| 292 | ENDDO |
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| 293 | |
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| 294 | ! Calculate the mass of each atmospheric layer (kg.m-2) |
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| 295 | do ilay=1,nlayer |
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| 296 | do ig=1, ngrid |
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| 297 | masse(ig,ilay)=(pplev(ig,ilay) - pplev(ig,ilay+1)) /g |
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| 298 | end do |
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| 299 | end do |
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| 300 | |
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| 301 | ! ----------------------------------------------- |
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| 302 | ! START CONDENSATION/SEDIMENTATION SUB-TIME LOOP |
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| 303 | ! ----------------------------------------------- |
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| 304 | Ntime = 20 ! number of sub-timestep |
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| 305 | subptimestep = ptimestep/float(Ntime) |
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| 306 | |
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| 307 | DO it=1,Ntime |
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| 308 | |
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| 309 | ! Add the tendencies from other physical processes at each subtimstep |
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| 310 | DO l=1,nlayer |
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| 311 | DO ig=1,ngrid |
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| 312 | zt(ig,l) = zt(ig,l) + pdt(ig,l) * subptimestep |
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| 313 | zq(ig,l,i_co2ice) = zq(ig,l,i_co2ice) + pdq(ig,l,i_co2ice) * subptimestep |
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| 314 | END DO |
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| 315 | END DO |
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| 316 | |
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| 317 | |
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| 318 | ! Gravitational sedimentation |
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| 319 | |
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| 320 | ! sedimentation computed from radius computed from q |
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| 321 | ! assuming that the ice is splitted in Nmix particle |
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| 322 | do ilay=1,nlayer |
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| 323 | do ig=1, ngrid |
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| 324 | |
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| 325 | reff = CBRT( 3*zq(ig,ilay,i_co2ice)/( 4*Nmix_co2*pi*rho_co2 )) |
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| 326 | |
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| 327 | ! there should be a more elegant way of doing this... |
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| 328 | if(reff.lt.1.e-16) reff=1.e-16 |
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| 329 | |
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| 330 | ! update reffrad for radiative transfer |
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| 331 | if(reff.lt.reffradmin)then |
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| 332 | reffrad(ig,ilay,1)=reffradmin |
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| 333 | !print*,'reff below optical limit' |
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| 334 | elseif(reff.gt.reffradmax)then |
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| 335 | reffrad(ig,ilay,1)=reffradmax |
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| 336 | !print*,'reff above optical limit' |
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| 337 | else |
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| 338 | reffrad(ig,ilay,1)=reff |
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| 339 | endif |
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| 340 | |
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| 341 | call stokes & |
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| 342 | (pplev(ig,ilay),pt(ig,ilay), & |
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| 343 | reff,vstokes,rho_co2) |
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| 344 | |
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| 345 | !w(ig,ilay,i_co2ice) = 0.0 |
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| 346 | w(ig,ilay,i_co2ice) = vstokes * subptimestep * & |
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| 347 | pplev(ig,ilay)/(r*pt(ig,ilay)) |
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| 348 | |
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| 349 | end do |
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| 350 | end do |
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| 351 | |
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| 352 | ! Computing q after sedimentation |
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| 353 | |
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| 354 | call vlz_fi(ngrid,zq(1,1,i_co2ice),2.,masse,w(1,1,i_co2ice),wq) |
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| 355 | |
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| 356 | |
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| 357 | ! Progressively accumulating the flux to the ground |
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| 358 | ! Mfallice is the total amount of ice fallen to the ground |
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| 359 | do ig=1,ngrid |
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| 360 | Mfallice(ig) = Mfallice(ig) + wq(ig,i_co2ice) |
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| 361 | end do |
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| 362 | |
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| 363 | |
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| 364 | ! Condensation / sublimation in the atmosphere |
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| 365 | ! -------------------------------------------- |
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| 366 | ! (calculation of zcondicea, zfallice and pdtc) |
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| 367 | ! (MODIFICATIONS FOR EARLY MARS: falling heat neglected, condensation |
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| 368 | ! of CO2 into tracer i_co2ice) |
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| 369 | |
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| 370 | DO l=nlayer , 1, -1 |
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| 371 | DO ig=1,ngrid |
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| 372 | pdtc(ig,l)=0. |
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| 373 | |
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| 374 | ! tweak ccond if the gas is non-ideal |
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| 375 | if(nonideal)then |
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| 376 | ccond=cpp3D(ig,l)/(g*latcond) |
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| 377 | endif |
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| 378 | |
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| 379 | |
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| 380 | IF ((zt(ig,l).LT.ztcond(ig,l)).or.(zq(ig,l,i_co2ice).gt.0)) THEN |
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| 381 | condsub(ig)=.true. |
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| 382 | pdtc(ig,l) = (ztcond(ig,l) - zt(ig,l))/subptimestep |
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| 383 | pdqc(ig,l,i_co2ice) = pdtc(ig,l)*ccond*g |
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| 384 | |
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| 385 | ! Case when the ice from above sublimes entirely |
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| 386 | IF ((zq(ig,l,i_co2ice).lt.-pdqc(ig,l,i_co2ice)*subptimestep) & |
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| 387 | .AND. (zq(ig,l,i_co2ice).gt.0)) THEN |
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| 388 | |
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| 389 | pdqc(ig,l,i_co2ice) = -zq(ig,l,i_co2ice)/subptimestep |
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| 390 | pdtc(ig,l) =-zq(ig,l,i_co2ice)/(ccond*g*subptimestep) |
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| 391 | |
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| 392 | END IF |
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| 393 | |
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| 394 | ! Temperature and q after condensation |
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| 395 | zt(ig,l) = zt(ig,l) + pdtc(ig,l) * subptimestep |
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| 396 | zq(ig,l,i_co2ice) = zq(ig,l,i_co2ice) + pdqc(ig,l,i_co2ice) * subptimestep |
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| 397 | END IF |
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| 398 | |
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| 399 | ENDDO |
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| 400 | ENDDO |
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| 401 | ENDDO ! end of subtimestep loop |
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| 402 | |
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| 403 | ! Computing global tendencies after the subtimestep |
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| 404 | DO l=1,nlayer |
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| 405 | DO ig=1,ngrid |
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| 406 | pdtc(ig,l) = & |
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| 407 | (zt(ig,l) - (pt(ig,l) + pdt(ig,l)*ptimestep))/ptimestep |
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| 408 | pdqc(ig,l,i_co2ice) = & |
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| 409 | (zq(ig,l,i_co2ice)-(pq(ig,l,i_co2ice)+pdq(ig,l,i_co2ice)*ptimestep))/ptimestep |
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| 410 | END DO |
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| 411 | END DO |
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| 412 | DO ig=1,ngrid |
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| 413 | zfallice(ig) = Mfallice(ig)/ptimestep |
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| 414 | END DO |
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| 415 | |
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| 416 | |
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| 417 | !----------------------------------------------------------------------- |
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| 418 | ! Condensation/sublimation on the ground |
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| 419 | ! (calculation of zcondices and pdtsrfc) |
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| 420 | |
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| 421 | ! forecast of ground temperature ztsrf and frost temperature ztcondsol |
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| 422 | DO ig=1,ngrid |
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| 423 | ppco2=gfrac(igasco2)*pplay(ig,1) |
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| 424 | call get_tcond_co2(ppco2,ztcondsol(ig)) |
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| 425 | |
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| 426 | ztsrf(ig) = ptsrf(ig) |
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| 427 | |
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| 428 | if((ztsrf(ig).le.ztcondsol(ig)+2.0).and.(ngrid.eq.1))then |
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| 429 | print*,'CO2 is condensing on the surface in 1D. This atmosphere is doomed.' |
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| 430 | print*,'T_surf = ',ztsrf,'K' |
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| 431 | print*,'T_cond = ',ztcondsol,'K' |
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| 432 | open(116,file='surf_vals.out') |
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| 433 | write(116,*) 0.0, pplev(1,1), 0.0, 0.0 |
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| 434 | close(116) |
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| 435 | call abort |
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| 436 | endif |
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| 437 | |
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| 438 | ztsrf(ig) = ptsrf(ig) + pdtsrf(ig)*ptimestep |
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| 439 | |
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| 440 | ENDDO |
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| 441 | |
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| 442 | DO ig=1,ngrid |
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| 443 | IF(ig.GT.ngrid/2+1) THEN |
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| 444 | icap=2 |
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| 445 | ELSE |
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| 446 | icap=1 |
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| 447 | ENDIF |
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| 448 | |
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| 449 | ! Loop over where we have condensation / sublimation |
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| 450 | IF ((ztsrf(ig) .LT. ztcondsol(ig)) .OR. & ! ground condensation |
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| 451 | (zfallice(ig).NE.0.) .OR. & ! falling snow |
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| 452 | ((ztsrf(ig) .GT. ztcondsol(ig)) .AND. & ! ground sublimation |
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| 453 | ((piceco2(ig)+zfallice(ig)*ptimestep) .NE. 0.))) THEN |
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| 454 | condsub(ig) = .true. |
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| 455 | |
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| 456 | ! Condensation or partial sublimation of CO2 ice |
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| 457 | zcondices(ig)=pcapcal(ig)*(ztcondsol(ig)-ztsrf(ig)) & |
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| 458 | /(latcond*ptimestep) |
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| 459 | pdtsrfc(ig) = (ztcondsol(ig) - ztsrf(ig))/ptimestep |
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| 460 | |
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| 461 | ! If the entire CO_2 ice layer sublimes |
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| 462 | ! (including what has just condensed in the atmosphere) |
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| 463 | IF((piceco2(ig)/ptimestep+zfallice(ig)).LE. & |
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| 464 | -zcondices(ig))THEN |
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| 465 | zcondices(ig) = -piceco2(ig)/ptimestep - zfallice(ig) |
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| 466 | pdtsrfc(ig)=(latcond/pcapcal(ig))* & |
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| 467 | (zcondices(ig)) |
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| 468 | END IF |
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| 469 | |
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| 470 | ! Changing CO2 ice amount and pressure |
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| 471 | |
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| 472 | zdiceco2(ig) = zcondices(ig) + zfallice(ig) |
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| 473 | piceco2(ig) = piceco2(ig) + zdiceco2(ig)*ptimestep |
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| 474 | pdpsrf(ig) = -zdiceco2(ig)*g |
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| 475 | |
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| 476 | IF(ABS(pdpsrf(ig)*ptimestep).GT.pplev(ig,1)) THEN |
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| 477 | PRINT*,'STOP in condens' |
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| 478 | PRINT*,'condensing more than total mass' |
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| 479 | PRINT*,'Grid point ',ig |
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| 480 | PRINT*,'Ps = ',pplev(ig,1) |
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| 481 | PRINT*,'d Ps = ',pdpsrf(ig) |
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| 482 | STOP |
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| 483 | ENDIF |
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| 484 | END IF |
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| 485 | ENDDO |
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| 486 | |
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| 487 | ! Surface albedo and emissivity of the ground below the snow (emisref) |
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| 488 | ! -------------------------------------------------------------------- |
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| 489 | do ig =1,ngrid |
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| 490 | IF(ig.GT.ngrid/2+1) THEN |
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| 491 | icap=2 |
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| 492 | ELSE |
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| 493 | icap=1 |
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| 494 | ENDIF |
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| 495 | |
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| 496 | if(.not.piceco2(ig).ge.0.) THEN |
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| 497 | if(piceco2(ig).le.-1.e-8) print*, & |
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| 498 | 'WARNING in condense_co2cloud: piceco2(',ig,')=', piceco2(ig) |
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| 499 | piceco2(ig)=0. |
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| 500 | endif |
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| 501 | if (piceco2(ig).gt.0) then |
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| 502 | psolaralb(ig) = albedice(icap) |
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| 503 | emisref(ig) = emisice(icap) |
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| 504 | else |
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| 505 | psolaralb(ig) = albedodat(ig) |
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| 506 | emisref(ig) = emissiv |
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| 507 | pemisurf(ig) = emissiv |
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| 508 | end if |
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| 509 | end do |
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| 510 | |
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| 511 | return |
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| 512 | end subroutine condens_co2cloud |
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| 513 | |
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| 514 | !------------------------------------------------------------------------- |
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| 515 | subroutine get_tcond_co2(p,tcond) |
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| 516 | ! Calculates the condensation temperature for CO2 |
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| 517 | |
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| 518 | implicit none |
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| 519 | |
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| 520 | #include "callkeys.h" |
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| 521 | |
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| 522 | real p, peff, tcond |
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| 523 | real, parameter :: ptriple=518000.0 |
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| 524 | |
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| 525 | peff=p!/co2supsat |
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| 526 | |
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| 527 | if(peff.lt.ptriple)then |
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| 528 | tcond = (-3167.8)/(log(.01*peff)-23.23) ! Fanale's formula |
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| 529 | else |
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| 530 | tcond = 684.2-92.3*log(peff)+4.32*log(peff)**2 |
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| 531 | ! liquid-vapour transition (based on CRC handbook 2003 data) |
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| 532 | endif |
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| 533 | return |
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| 534 | |
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| 535 | end subroutine get_tcond_co2 |
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