| 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 | use watercommon_h, only : RLVTT, RCPD, RVTMP2, & |
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| 5 | T_h2O_ice_clouds,T_h2O_ice_liq,Psat_water,Lcpdqsat_water |
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| 6 | USE tracer_h |
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| 7 | IMPLICIT none |
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| 8 | |
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| 9 | !================================================================== |
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| 10 | ! |
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| 11 | ! Purpose |
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| 12 | ! ------- |
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| 13 | ! Calculates large-scale (stratiform) H2O condensation. |
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| 14 | ! |
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| 15 | ! Authors |
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| 16 | ! ------- |
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| 17 | ! Adapted from the LMDTERRE code by R. Wordsworth (2009) |
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| 18 | ! Original author Z. X. Li (1993) |
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| 19 | ! |
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| 20 | !================================================================== |
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| 21 | |
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| 22 | #include "dimensions.h" |
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| 23 | #include "dimphys.h" |
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| 24 | #include "comcstfi.h" |
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| 25 | |
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| 26 | #include "callkeys.h" |
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| 27 | |
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| 28 | INTEGER ngrid,nq |
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| 29 | |
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| 30 | ! Arguments |
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| 31 | REAL ptimestep ! intervalle du temps (s) |
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| 32 | REAL pplev(ngrid,nlayermx+1) ! pression a inter-couche |
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| 33 | REAL pplay(ngrid,nlayermx) ! pression au milieu de couche |
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| 34 | REAL pt(ngrid,nlayermx) ! temperature (K) |
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| 35 | real pq(ngrid,nlayermx,nq) ! tracer mixing ratio (kg/kg) |
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| 36 | REAL pdt(ngrid,nlayermx) ! physical temperature tenedency (K/s) |
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| 37 | REAL pdq(ngrid,nlayermx,nq)! physical tracer tenedency (K/s) |
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| 38 | REAL pdtlsc(ngrid,nlayermx) ! incrementation de la temperature (K) |
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| 39 | REAL pdqvaplsc(ngrid,nlayermx) ! incrementation de la vapeur d'eau |
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| 40 | REAL pdqliqlsc(ngrid,nlayermx) ! incrementation de l'eau liquide |
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| 41 | REAL rneb(ngrid,nlayermx) ! fraction nuageuse |
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| 42 | |
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| 43 | |
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| 44 | ! Options du programme |
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| 45 | REAL ratqs ! determine largeur de la distribution de vapeur |
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| 46 | PARAMETER (ratqs=0.2) |
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| 47 | |
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| 48 | ! Variables locales |
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| 49 | REAL CBRT |
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| 50 | EXTERNAL CBRT |
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| 51 | INTEGER i, k , nn |
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| 52 | INTEGER,PARAMETER :: nitermax=2000 |
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| 53 | REAL,PARAMETER :: alpha=.5,qthreshold=1.e-6 |
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| 54 | ! JL13: if "careful, T<Tmin in psat water" appears often, you may want to stabilise the model by |
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| 55 | ! decreasing alpha and increasing nitermax accordingly |
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| 56 | REAL zt(ngrid), zq(ngrid) |
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| 57 | REAL zcond(ngrid),zcond_iter |
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| 58 | REAL zdelq(ngrid) |
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| 59 | REAL zqs(ngrid), zdqs(ngrid) |
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| 60 | REAL psat_tmp,dlnpsat_tmp |
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| 61 | |
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| 62 | ! evaporation calculations |
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| 63 | REAL dqevap(ngrid,nlayermx),dtevap(ngrid,nlayermx) |
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| 64 | REAL qevap(ngrid,nlayermx,nq) |
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| 65 | REAL tevap(ngrid,nlayermx) |
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| 66 | |
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| 67 | REAL zcor(ngrid), zdelta(ngrid), zcvm5(ngrid) |
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| 68 | REAL zx_q(ngrid) |
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| 69 | REAL Nmix_local,zfice |
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| 70 | |
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| 71 | ! GCM -----> subroutine variables, initialisation of outputs |
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| 72 | |
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| 73 | pdtlsc(1:ngrid,1:nlayermx) = 0.0 |
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| 74 | pdqvaplsc(1:ngrid,1:nlayermx) = 0.0 |
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| 75 | pdqliqlsc(1:ngrid,1:nlayermx) = 0.0 |
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| 76 | rneb(1:ngrid,1:nlayermx) = 0.0 |
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| 77 | |
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| 78 | |
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| 79 | ! Evaporate cloud water/ice |
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| 80 | call evap(ngrid,nq,ptimestep,pt,pq,pdq,pdt,dqevap,dtevap,qevap,tevap) |
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| 81 | ! note: we use qevap but not tevap in largescale/moistadj |
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| 82 | ! otherwise is a big mess |
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| 83 | |
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| 84 | |
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| 85 | ! Boucle verticale (du haut vers le bas) |
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| 86 | DO k = nlayermx, 1, -1 |
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| 87 | |
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| 88 | zt(1:ngrid)=pt(1:ngrid,k)+(pdt(1:ngrid,k)+dtevap(1:ngrid,k))*ptimestep |
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| 89 | zq(1:ngrid)=qevap(1:ngrid,k,igcm_h2o_vap) !liquid water is included in qevap |
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| 90 | |
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| 91 | ! Calculer la vapeur d'eau saturante et |
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| 92 | ! determiner la condensation partielle |
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| 93 | DO i = 1, ngrid |
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| 94 | |
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| 95 | if(zt(i).le.15.) then |
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| 96 | print*,'in lsc',i,k,zt(i) |
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| 97 | ! zt(i)=15. ! check too low temperatures |
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| 98 | endif |
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| 99 | call Psat_water(zt(i),pplay(i,k),psat_tmp,zqs(i)) |
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| 100 | |
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| 101 | zdelq(i) = MAX(MIN(ratqs * zq(i),1.-zq(i)),1.e-12) |
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| 102 | rneb(i,k) = (zq(i)+zdelq(i)-zqs(i)) / (2.0*zdelq(i)) |
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| 103 | ! print*,zq(i),zdelq(i),zqs(i),rneb(i,k) |
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| 104 | if (rneb(i,k).lt.0.) then !no clouds |
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| 105 | |
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| 106 | rneb(i,k)=0. |
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| 107 | zcond(i)=0. |
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| 108 | |
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| 109 | else if (rneb(i,k).gt.1.) then !complete cloud cover, we start without evaporating |
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| 110 | |
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| 111 | rneb(i,k)=1. |
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| 112 | zt(i)=pt(i,k)+pdt(i,k)*ptimestep |
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| 113 | zx_q(i) = pq(i,k,igcm_h2o_vap)+pdq(i,k,igcm_h2o_vap)*ptimestep |
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| 114 | dqevap(i,k)=0. |
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| 115 | ! iterative process to stabilize the scheme when large water amounts JL12 |
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| 116 | zcond(i) = 0.0 |
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| 117 | Do nn=1,nitermax |
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| 118 | call Psat_water(zt(i),pplay(i,k),psat_tmp,zqs(i)) |
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| 119 | call Lcpdqsat_water(zt(i),pplay(i,k),psat_tmp,zqs(i),zdqs(i),dlnpsat_tmp) |
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| 120 | zcond_iter = alpha*(zx_q(i)-zqs(i))/(1.+zdqs(i)) |
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| 121 | !zcond can be negative here |
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| 122 | zx_q(i) = zx_q(i) - zcond_iter |
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| 123 | zcond(i) = zcond(i) + zcond_iter |
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| 124 | zt(i) = zt(i) + zcond_iter*RLVTT/RCPD |
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| 125 | if (ABS(zcond_iter/alpha).lt.qthreshold) exit |
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| 126 | End do ! niter |
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| 127 | zcond(i)=MAX(zcond(i),-(pq(i,k,igcm_h2o_ice)+pdq(i,k,igcm_h2o_ice)*ptimestep)) |
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| 128 | |
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| 129 | else !standard case |
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| 130 | |
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| 131 | zx_q(i) = (zq(i)+zdelq(i)+zqs(i))/2.0 !water vapor in cloudy sky |
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| 132 | ! iterative process to stabilize the scheme when large water amounts JL12 |
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| 133 | zcond(i) = 0.0 |
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| 134 | Do nn=1,nitermax |
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| 135 | call Lcpdqsat_water(zt(i),pplay(i,k),psat_tmp,zqs(i),zdqs(i),dlnpsat_tmp) |
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| 136 | zcond_iter = MAX(0.0,alpha*(zx_q(i)-zqs(i))/(1.+zdqs(i))) |
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| 137 | !zcond always postive! cannot evaporate clouds! |
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| 138 | !this is why we must reevaporate before largescale |
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| 139 | zx_q(i) = zx_q(i) - zcond_iter |
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| 140 | zcond(i) = zcond(i) + zcond_iter |
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| 141 | if (ABS(zcond_iter/alpha).lt.qthreshold) exit |
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| 142 | zt(i) = zt(i) + zcond_iter*RLVTT/RCPD*rneb(i,k) |
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| 143 | call Psat_water(zt(i),pplay(i,k),psat_tmp,zqs(i)) |
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| 144 | End do ! niter |
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| 145 | |
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| 146 | Endif |
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| 147 | |
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| 148 | zcond(i) = zcond(i)*rneb(i,k)/ptimestep ! JL12 |
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| 149 | |
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| 150 | ENDDO |
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| 151 | |
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| 152 | ! Tendances de t et q |
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| 153 | pdqvaplsc(1:ngrid,k) = dqevap(1:ngrid,k) - zcond(1:ngrid) |
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| 154 | pdqliqlsc(1:ngrid,k) = - pdqvaplsc(1:ngrid,k) |
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| 155 | pdtlsc(1:ngrid,k) = pdqliqlsc(1:ngrid,k)*RLVTT/RCPD |
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| 156 | |
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| 157 | Enddo ! k= nlayermx, 1, -1 |
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| 158 | |
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| 159 | !print*,'qsat=',zqs |
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| 160 | !print*,'q=',q |
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| 161 | !print*,'dq=',pdqvaplsc*ptimestep |
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| 162 | !print*,'dT in LS=',pdtlsc*ptimestep |
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| 163 | |
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| 164 | !print*,'rice=',rice |
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| 165 | !print*,'rneb=',rneb |
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| 166 | |
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| 167 | return |
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| 168 | end |
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