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! $Header: /home/cvsroot/LMDZ4/libf/phylmd/soil.F,v 1.1.1.1 2004/05/19 12:53:09 lmdzadmin Exp $ |
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SUBROUTINE soil(ptimestep, indice, knon, snow, ptsrf, ptsoil, |
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s pcapcal, pfluxgrd) |
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use dimens_m |
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use indicesol |
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use dimphy |
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use dimsoil |
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use YOMCST |
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IMPLICIT NONE |
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c======================================================================= |
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c |
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c Auteur: Frederic Hourdin 30/01/92 |
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c ------- |
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c |
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c objet: computation of : the soil temperature evolution |
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c ------ the surfacic heat capacity "Capcal" |
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c the surface conduction flux pcapcal |
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c |
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c |
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c Method: implicit time integration |
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c ------- |
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c Consecutive ground temperatures are related by: |
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c T(k+1) = C(k) + D(k)*T(k) (1) |
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c the coefficients C and D are computed at the t-dt time-step. |
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c Routine structure: |
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c 1)new temperatures are computed using (1) |
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c 2)C and D coefficients are computed from the new temperature |
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c profile for the t+dt time-step |
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c 3)the coefficients A and B are computed where the diffusive |
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c fluxes at the t+dt time-step is given by |
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c Fdiff = A + B Ts(t+dt) |
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c or Fdiff = F0 + Capcal (Ts(t+dt)-Ts(t))/dt |
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c with F0 = A + B (Ts(t)) |
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c Capcal = B*dt |
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c |
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c Interface: |
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c ---------- |
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c |
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c Arguments: |
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c ---------- |
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c ptimestep physical timestep (s) |
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c indice sub-surface index |
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c snow(klon,nbsrf) snow |
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c ptsrf(klon) surface temperature at time-step t (K) |
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c ptsoil(klon,nsoilmx) temperature inside the ground (K) |
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c pcapcal(klon) surfacic specific heat (W*m-2*s*K-1) |
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c pfluxgrd(klon) surface diffusive flux from ground (Wm-2) |
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c |
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c======================================================================= |
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c declarations: |
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c ------------- |
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c----------------------------------------------------------------------- |
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c arguments |
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c --------- |
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REAL ptimestep |
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INTEGER indice, knon |
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REAL ptsrf(klon),ptsoil(klon,nsoilmx),snow(klon) |
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REAL pcapcal(klon),pfluxgrd(klon) |
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c----------------------------------------------------------------------- |
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c local arrays |
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c ------------ |
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INTEGER ig,jk |
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c$$$ REAL zdz2(nsoilmx),z1(klon) |
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REAL zdz2(nsoilmx),z1(klon,nbsrf) |
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REAL min_period,dalph_soil |
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REAL ztherm_i(klon) |
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c local saved variables: |
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c ---------------------- |
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REAL dz1(nsoilmx),dz2(nsoilmx) |
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c$$$ REAL zc(klon,nsoilmx),zd(klon,nsoilmx) |
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REAL zc(klon,nsoilmx,nbsrf),zd(klon,nsoilmx,nbsrf) |
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REAL lambda |
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SAVE dz1,dz2,zc,zd,lambda |
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LOGICAL firstcall, firstsurf(nbsrf) |
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SAVE firstcall, firstsurf |
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REAL isol,isno,iice |
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SAVE isol,isno,iice |
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DATA firstcall/.true./ |
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DATA firstsurf/.TRUE.,.TRUE.,.TRUE.,.TRUE./ |
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DATA isol,isno,iice/2000.,2000.,2000./ |
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c----------------------------------------------------------------------- |
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c Depthts: |
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c -------- |
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REAL fz,rk,fz1,rk1,rk2 |
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fz(rk)=fz1*(dalph_soil**rk-1.)/(dalph_soil-1.) |
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pfluxgrd(:) = 0. |
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c calcul de l'inertie thermique a partir de la variable rnat. |
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c on initialise a iice meme au-dessus d'un point de mer au cas |
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c ou le point de mer devienne point de glace au pas suivant |
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c on corrige si on a un point de terre avec ou sans glace |
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c |
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IF (indice.EQ.is_sic) THEN |
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DO ig = 1, knon |
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ztherm_i(ig) = iice |
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IF (snow(ig).GT.0.0) ztherm_i(ig) = isno |
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ENDDO |
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ELSE IF (indice.EQ.is_lic) THEN |
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DO ig = 1, knon |
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ztherm_i(ig) = iice |
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IF (snow(ig).GT.0.0) ztherm_i(ig) = isno |
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ENDDO |
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ELSE IF (indice.EQ.is_ter) THEN |
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DO ig = 1, knon |
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ztherm_i(ig) = isol |
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IF (snow(ig).GT.0.0) ztherm_i(ig) = isno |
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ENDDO |
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ELSE IF (indice.EQ.is_oce) THEN |
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DO ig = 1, knon |
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ztherm_i(ig) = iice |
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ENDDO |
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ELSE |
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PRINT*, "valeur d indice non prevue", indice |
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stop 1 |
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ENDIF |
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c$$$ IF (firstcall) THEN |
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IF (firstsurf(indice)) THEN |
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c----------------------------------------------------------------------- |
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c ground levels |
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c grnd=z/l where l is the skin depth of the diurnal cycle: |
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c -------------------------------------------------------- |
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min_period=1800. ! en secondes |
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dalph_soil=2. ! rapport entre les epaisseurs de 2 couches succ. |
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OPEN(99,file='soil.def',status='old',form='formatted',err=9999) |
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READ(99,*) min_period |
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READ(99,*) dalph_soil |
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PRINT*,'Discretization for the soil model' |
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PRINT*,'First level e-folding depth',min_period, |
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s ' dalph',dalph_soil |
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CLOSE(99) |
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9999 CONTINUE |
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c la premiere couche represente un dixieme de cycle diurne |
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fz1=sqrt(min_period/3.14) |
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DO jk=1,nsoilmx |
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rk1=jk |
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rk2=jk-1 |
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dz2(jk)=fz(rk1)-fz(rk2) |
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ENDDO |
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DO jk=1,nsoilmx-1 |
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rk1=jk+.5 |
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rk2=jk-.5 |
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dz1(jk)=1./(fz(rk1)-fz(rk2)) |
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ENDDO |
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lambda=fz(.5)*dz1(1) |
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PRINT*,'full layers, intermediate layers (seconds)' |
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DO jk=1,nsoilmx |
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rk=jk |
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rk1=jk+.5 |
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rk2=jk-.5 |
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PRINT *,'fz=', |
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. fz(rk1)*fz(rk2)*3.14,fz(rk)*fz(rk)*3.14 |
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ENDDO |
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C PB |
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firstsurf(indice) = .FALSE. |
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c$$$ firstcall =.false. |
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c Initialisations: |
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c ---------------- |
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ELSE !--not firstcall |
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c----------------------------------------------------------------------- |
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c Computation of the soil temperatures using the Cgrd and Dgrd |
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c coefficient computed at the previous time-step: |
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c ----------------------------------------------- |
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c surface temperature |
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DO ig=1,knon |
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ptsoil(ig,1)=(lambda*zc(ig,1,indice)+ptsrf(ig))/ |
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s (lambda*(1.-zd(ig,1,indice))+1.) |
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ENDDO |
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c other temperatures |
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DO jk=1,nsoilmx-1 |
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DO ig=1,knon |
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ptsoil(ig,jk+1)=zc(ig,jk,indice)+zd(ig,jk,indice) |
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$ *ptsoil(ig,jk) |
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ENDDO |
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ENDDO |
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ENDIF !--not firstcall |
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c----------------------------------------------------------------------- |
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c Computation of the Cgrd and Dgrd coefficient for the next step: |
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c --------------------------------------------------------------- |
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c$$$ PB ajout pour cas glace de mer |
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IF (indice .EQ. is_sic) THEN |
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DO ig = 1 , knon |
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ptsoil(ig,nsoilmx) = RTT - 1.8 |
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END DO |
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ENDIF |
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DO jk=1,nsoilmx |
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zdz2(jk)=dz2(jk)/ptimestep |
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ENDDO |
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DO ig=1,knon |
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z1(ig,indice)=zdz2(nsoilmx)+dz1(nsoilmx-1) |
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zc(ig,nsoilmx-1,indice)= |
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$ zdz2(nsoilmx)*ptsoil(ig,nsoilmx)/z1(ig,indice) |
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zd(ig,nsoilmx-1,indice)=dz1(nsoilmx-1)/z1(ig,indice) |
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ENDDO |
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DO jk=nsoilmx-1,2,-1 |
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DO ig=1,knon |
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z1(ig,indice)=1./(zdz2(jk)+dz1(jk-1)+dz1(jk) |
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$ *(1.-zd(ig,jk,indice))) |
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zc(ig,jk-1,indice)= |
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s (ptsoil(ig,jk)*zdz2(jk)+dz1(jk)*zc(ig,jk,indice)) |
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$ *z1(ig,indice) |
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zd(ig,jk-1,indice)=dz1(jk-1)*z1(ig,indice) |
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ENDDO |
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ENDDO |
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c----------------------------------------------------------------------- |
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c computation of the surface diffusive flux from ground and |
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c calorific capacity of the ground: |
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c --------------------------------- |
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DO ig=1,knon |
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pfluxgrd(ig)=ztherm_i(ig)*dz1(1)* |
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s (zc(ig,1,indice)+(zd(ig,1,indice)-1.)*ptsoil(ig,1)) |
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pcapcal(ig)=ztherm_i(ig)* |
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s (dz2(1)+ptimestep*(1.-zd(ig,1,indice))*dz1(1)) |
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z1(ig,indice)=lambda*(1.-zd(ig,1,indice))+1. |
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pcapcal(ig)=pcapcal(ig)/z1(ig,indice) |
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pfluxgrd(ig) = pfluxgrd(ig) |
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s + pcapcal(ig) * (ptsoil(ig,1) * z1(ig,indice) |
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$ - lambda * zc(ig,1,indice) |
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$ - ptsrf(ig)) |
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s /ptimestep |
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ENDDO |
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RETURN |
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END |
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