| 1 | subroutine largescale(ngrid,nq,ptimestep, pplev, pplay, pt, pq, & |
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| 2 | pdt, pdq, pdtlsc, pdqvaplsc, pdqliqlsc, rneb) |
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| 3 | |
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| 4 | |
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| 5 | ! to use 'getin' |
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| 6 | use ioipsl_getincom |
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| 7 | use watercommon_h, only : RLVTT, RCPD, RVTMP2, & |
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| 8 | T_h2O_ice_clouds,T_h2O_ice_liq,Psat_waterDP,Lcpdqsat_waterDP |
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| 9 | USE tracer_h |
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| 10 | IMPLICIT none |
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| 11 | |
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| 12 | !================================================================== |
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| 13 | ! |
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| 14 | ! Purpose |
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| 15 | ! ------- |
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| 16 | ! Calculates large-scale (stratiform) H2O condensation. |
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| 17 | ! |
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| 18 | ! Authors |
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| 19 | ! ------- |
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| 20 | ! Adapted from the LMDTERRE code by R. Wordsworth (2009) |
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| 21 | ! Original author Z. X. Li (1993) |
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| 22 | ! |
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| 23 | !================================================================== |
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| 24 | |
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| 25 | #include "dimensions.h" |
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| 26 | #include "dimphys.h" |
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| 27 | #include "comcstfi.h" |
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| 28 | |
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| 29 | #include "callkeys.h" |
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| 30 | |
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| 31 | INTEGER ngrid,nq |
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| 32 | |
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| 33 | ! Arguments |
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| 34 | REAL ptimestep ! intervalle du temps (s) |
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| 35 | REAL pplev(ngrid,nlayermx+1) ! pression a inter-couche |
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| 36 | REAL pplay(ngrid,nlayermx) ! pression au milieu de couche |
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| 37 | REAL pt(ngrid,nlayermx) ! temperature (K) |
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| 38 | REAL pq(ngrid,nlayermx,nq) ! tracer mixing ratio (kg/kg) |
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| 39 | REAL pdt(ngrid,nlayermx) ! physical temperature tenedency (K/s) |
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| 40 | REAL pdq(ngrid,nlayermx,nq)! physical tracer tenedency (K/s) |
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| 41 | REAL pdtlsc(ngrid,nlayermx) ! incrementation de la temperature (K) |
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| 42 | REAL pdqvaplsc(ngrid,nlayermx) ! incrementation de la vapeur d'eau |
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| 43 | REAL pdqliqlsc(ngrid,nlayermx) ! incrementation de l'eau liquide |
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| 44 | REAL rneb(ngrid,nlayermx) ! fraction nuageuse |
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| 45 | |
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| 46 | |
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| 47 | ! Options du programme |
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| 48 | REAL, SAVE :: ratqs ! determine largeur de la distribution de vapeur |
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| 49 | |
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| 50 | ! Variables locales |
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| 51 | REAL CBRT |
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| 52 | EXTERNAL CBRT |
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| 53 | INTEGER i, k , nn |
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| 54 | INTEGER,PARAMETER :: nitermax=5000 |
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| 55 | DOUBLE PRECISION,PARAMETER :: alpha=.1,qthreshold=1.d-8 |
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| 56 | ! JL13: if "careful, T<Tmin in psat water" appears often, you may want to stabilise the model by |
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| 57 | ! decreasing alpha and increasing nitermax accordingly |
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| 58 | DOUBLE PRECISION zt(ngrid), zq(ngrid) |
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| 59 | DOUBLE PRECISION zcond(ngrid),zcond_iter |
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| 60 | DOUBLE PRECISION zdelq(ngrid) |
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| 61 | DOUBLE PRECISION zqs(ngrid), zdqs(ngrid) |
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| 62 | DOUBLE PRECISION local_p,psat_tmp,dlnpsat_tmp,Lcp |
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| 63 | |
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| 64 | ! evaporation calculations |
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| 65 | REAL dqevap(ngrid,nlayermx),dtevap(ngrid,nlayermx) |
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| 66 | REAL qevap(ngrid,nlayermx,nq) |
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| 67 | REAL tevap(ngrid,nlayermx) |
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| 68 | |
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| 69 | DOUBLE PRECISION zx_q(ngrid) |
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| 70 | LOGICAL,SAVE :: firstcall=.true. |
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| 71 | |
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| 72 | |
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| 73 | IF (firstcall) THEN |
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| 74 | |
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| 75 | write(*,*) "value for ratqs? " |
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| 76 | ratqs=0.2 ! default value |
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| 77 | call getin("ratqs",ratqs) |
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| 78 | write(*,*) " ratqs = ",ratqs |
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| 79 | |
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| 80 | firstcall = .false. |
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| 81 | ENDIF |
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| 82 | |
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| 83 | ! GCM -----> subroutine variables, initialisation of outputs |
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| 84 | |
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| 85 | pdtlsc(1:ngrid,1:nlayermx) = 0.0 |
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| 86 | pdqvaplsc(1:ngrid,1:nlayermx) = 0.0 |
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| 87 | pdqliqlsc(1:ngrid,1:nlayermx) = 0.0 |
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| 88 | rneb(1:ngrid,1:nlayermx) = 0.0 |
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| 89 | Lcp=RLVTT/RCPD |
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| 90 | |
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| 91 | |
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| 92 | ! Evaporate cloud water/ice |
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| 93 | call evap(ngrid,nq,ptimestep,pt,pq,pdq,pdt,dqevap,dtevap,qevap,tevap) |
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| 94 | ! note: we use qevap but not tevap in largescale/moistadj |
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| 95 | ! otherwise is a big mess |
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| 96 | |
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| 97 | |
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| 98 | ! Boucle verticale (du haut vers le bas) |
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| 99 | DO k = nlayermx, 1, -1 |
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| 100 | |
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| 101 | zt(1:ngrid)=pt(1:ngrid,k)+(pdt(1:ngrid,k)+dtevap(1:ngrid,k))*ptimestep |
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| 102 | zq(1:ngrid)=qevap(1:ngrid,k,igcm_h2o_vap) !liquid water is included in qevap |
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| 103 | |
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| 104 | ! Calculer la vapeur d'eau saturante et |
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| 105 | ! determiner la condensation partielle |
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| 106 | DO i = 1, ngrid |
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| 107 | |
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| 108 | local_p=pplay(i,k) |
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| 109 | if(zt(i).le.15.) then |
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| 110 | print*,'in lsc',i,k,zt(i) |
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| 111 | ! zt(i)=15. ! check too low temperatures |
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| 112 | endif |
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| 113 | call Psat_waterDP(zt(i),local_p,psat_tmp,zqs(i)) |
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| 114 | |
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| 115 | zdelq(i) = MAX(MIN(ratqs * zq(i),1.-zq(i)),1.d-12) |
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| 116 | rneb(i,k) = (zq(i)+zdelq(i)-zqs(i)) / (2.0*zdelq(i)) |
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| 117 | if (rneb(i,k).lt.0.) then !no clouds |
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| 118 | |
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| 119 | rneb(i,k)=0. |
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| 120 | zcond(i)=0. |
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| 121 | |
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| 122 | else if ((rneb(i,k).gt.0.99).or.(ratqs.lt.1.e-6)) then !complete cloud cover, we start without evaporating |
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| 123 | rneb(i,k)=1. |
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| 124 | zt(i)=pt(i,k)+pdt(i,k)*ptimestep |
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| 125 | zx_q(i) = pq(i,k,igcm_h2o_vap)+pdq(i,k,igcm_h2o_vap)*ptimestep |
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| 126 | dqevap(i,k)=0. |
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| 127 | ! iterative process to stabilize the scheme when large water amounts JL12 |
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| 128 | zcond(i) = 0.0d0 |
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| 129 | Do nn=1,nitermax |
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| 130 | call Psat_waterDP(zt(i),local_p,psat_tmp,zqs(i)) |
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| 131 | call Lcpdqsat_waterDP(zt(i),local_p,psat_tmp,zqs(i),zdqs(i),dlnpsat_tmp) |
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| 132 | zcond_iter = alpha*(zx_q(i)-zqs(i))/(1.d0+zdqs(i)) |
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| 133 | !zcond can be negative here |
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| 134 | zx_q(i) = zx_q(i) - zcond_iter |
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| 135 | zcond(i) = zcond(i) + zcond_iter |
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| 136 | zt(i) = zt(i) + zcond_iter*Lcp |
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| 137 | if (ABS(zcond_iter/alpha/zqs(i)).lt.qthreshold) exit |
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| 138 | ! if (ABS(zcond_iter/alpha).lt.qthreshold) exit |
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| 139 | if (nn.eq.nitermax) print*,'itermax in largescale' |
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| 140 | End do ! niter |
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| 141 | zcond(i)=MAX(zcond(i),-(pq(i,k,igcm_h2o_ice)+pdq(i,k,igcm_h2o_ice)*ptimestep)) |
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| 142 | |
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| 143 | else !standard case |
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| 144 | |
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| 145 | zx_q(i) = (zq(i)+zdelq(i)+zqs(i))/2.0d0 !water vapor in cloudy sky |
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| 146 | ! iterative process to stabilize the scheme when large water amounts JL12 |
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| 147 | zcond(i) = 0.0d0 |
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| 148 | Do nn=1,nitermax |
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| 149 | call Lcpdqsat_waterDP(zt(i),local_p,psat_tmp,zqs(i),zdqs(i),dlnpsat_tmp) |
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| 150 | zcond_iter = MAX(0.0d0,alpha*(zx_q(i)-zqs(i))/(1.d0+zdqs(i))) |
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| 151 | !zcond always postive! cannot evaporate clouds! |
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| 152 | !this is why we must reevaporate before largescale |
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| 153 | zx_q(i) = zx_q(i) - zcond_iter |
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| 154 | zcond(i) = zcond(i) + zcond_iter |
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| 155 | if (ABS(zcond_iter/alpha/zqs(i)).lt.qthreshold) exit |
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| 156 | ! if (ABS(zcond_iter/alpha).lt.qthreshold) exit |
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| 157 | zt(i) = zt(i) + zcond_iter*Lcp*rneb(i,k) |
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| 158 | call Psat_waterDP(zt(i),local_p,psat_tmp,zqs(i)) |
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| 159 | if (nn.eq.nitermax) print*,'itermax in largescale' |
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| 160 | End do ! niter |
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| 161 | |
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| 162 | Endif |
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| 163 | |
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| 164 | zcond(i) = zcond(i)*rneb(i,k)/ptimestep ! JL12 |
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| 165 | |
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| 166 | ENDDO |
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| 167 | |
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| 168 | ! Tendances de t et q |
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| 169 | pdqvaplsc(1:ngrid,k) = dqevap(1:ngrid,k) - zcond(1:ngrid) |
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| 170 | pdqliqlsc(1:ngrid,k) = - pdqvaplsc(1:ngrid,k) |
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| 171 | pdtlsc(1:ngrid,k) = pdqliqlsc(1:ngrid,k)*real(Lcp) |
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| 172 | |
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| 173 | Enddo ! k= nlayermx, 1, -1 |
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| 174 | |
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| 175 | |
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| 176 | return |
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| 177 | end |
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