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C $Header: $ |
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C $Name: $ |
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|
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#include "LAND_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: LAND_STEPFWD |
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C !INTERFACE: |
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SUBROUTINE LAND_STEPFWD( |
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I land_frc, bi, bj, myTime, myIter, myThid) |
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|
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R LAND_STEPFWD |
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C | o Land model main S/R: step forward land variables |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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C == Global variables === |
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C-- size for MITgcm & Land package : |
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#include "LAND_SIZE.h" |
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|
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#include "EEPARAMS.h" |
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#include "LAND_PARAMS.h" |
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#include "LAND_VARS.h" |
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|
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c #include "PARAMS.h" |
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c #include "GRID.h" |
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c #include "DYNVARS.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C land_frc :: land fraction [0-1] |
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C bi,bj :: Tile index |
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C myTime :: Current time of simulation ( s ) |
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C myIter :: Current iteration number in simulation |
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C myThid :: Number of this instance of the routine |
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_RS land_frc(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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INTEGER bi, bj, myIter, myThid |
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_RL myTime |
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CEOP |
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|
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#ifdef ALLOW_LAND |
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C == Local variables == |
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C i,j,k :: loop counters |
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C kp1 :: k+1 |
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C grd_HeatCp :: Heat capacity of the ground |
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C fieldCapac :: field capacity (of water) [m] |
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C ground_dTdt :: ground temperature tendency |
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C ground_dWdt :: soil moisture tendency |
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C flxkup :: downward flux, upper interface (k-1,k) |
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C flxdwn :: downward flux, lower interface (k,k+1) |
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C fractRunOff :: fraction of water in excess which leaves as runoff |
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C grdWexcess :: ground water in excess [m/s] |
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_RL grd_HeatCp, fieldCapac, ground_dTdt, ground_dWdt |
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_RL fractRunOff, grdWexcess, groundWnp1 |
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_RL flxkup(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL flxkdw(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER i,j,k,kp1 |
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|
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IF (land_calc_grT) THEN |
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C-- Step forward ground temperature: |
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|
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DO k=1,land_nLev |
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kp1 = MIN(k+1,land_nLev) |
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|
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IF (k.EQ.1) THEN |
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DO j=1,sNy |
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DO i=1,sNx |
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flxkup(i,j) = land_HeatFlx(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ELSE |
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DO j=1,sNy |
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DO i=1,sNx |
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flxkup(i,j) = flxkdw(i,j) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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DO j=1,sNy |
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DO i=1,sNx |
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IF ( land_frc(i,j,bi,bj).GT.0. ) THEN |
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C- Thermal conductivity flux, lower interface (k,k+1): |
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flxkdw(i,j) = land_grdLambda* |
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& ( land_groundT(i,j,k,bi,bj) |
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& -land_groundT(i,j,kp1,bi,bj) ) |
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& *land_rec_dzC(kp1) |
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|
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C- Ground Heat capacity, layer k: |
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grd_HeatCp = land_heatCs |
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& + land_heatCw*land_groundW(i,j,k,bi,bj) |
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& *land_waterCap |
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|
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C- Net temperature tendency |
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ground_dTdt = (flxkup(i,j)-flxkdw(i,j)) |
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& / (grd_HeatCp*land_dzF(k)) |
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|
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C- Step forward ground temperature, level k : |
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land_groundT(i,j,k,bi,bj) = land_groundT(i,j,k,bi,bj) |
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& + land_deltaT*ground_dTdt |
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|
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ENDIF |
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ENDDO |
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ENDDO |
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|
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ENDDO |
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C-- step forward ground temperature: end |
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ENDIF |
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|
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IF (land_calc_grW) THEN |
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C-- Step forward ground Water: |
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|
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DO k=1,land_nLev |
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IF (k.EQ.land_nLev) THEN |
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kp1 = k |
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fractRunOff = 1. _d 0 |
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ELSE |
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kp1 = k+1 |
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fractRunOff = land_fractRunOff |
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ENDIF |
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fieldCapac = land_waterCap*land_dzF(k) |
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|
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IF (k.EQ.1) THEN |
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DO j=1,sNy |
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DO i=1,sNx |
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flxkup(i,j) = land_Pr_m_Ev(i,j,bi,bj) |
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land_runOff(i,j,bi,bj) = 0. _d 0 |
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ENDDO |
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ENDDO |
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ELSE |
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DO j=1,sNy |
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DO i=1,sNx |
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flxkup(i,j) = flxkdw(i,j) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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DO j=1,sNy |
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DO i=1,sNx |
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IF ( land_frc(i,j,bi,bj).GT.0. ) THEN |
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C- Diffusion flux of soil moisture, lower interface (k,k+1): |
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flxkdw(i,j) = fieldCapac* |
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& ( land_groundW(i,j,k,bi,bj) |
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& -land_groundW(i,j,kp1,bi,bj) ) |
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& / land_wTauDiff |
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|
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C- Net soil moisture tendency |
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ground_dWdt = (flxkup(i,j)-flxkdw(i,j)) / fieldCapac |
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|
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C- Step forward soil moisture, level k : |
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groundWnp1 = land_groundW(i,j,k,bi,bj) |
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& + land_deltaT*ground_dWdt |
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land_groundW(i,j,k,bi,bj) = MIN(1. _d 0, groundWnp1) |
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|
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C- Run off: fraction 1-fractRunOff enters level below |
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grdWexcess = ( groundWnp1 - MIN(1. _d 0, groundWnp1) ) |
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& *fieldCapac/land_deltaT |
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flxkdw(i,j) = flxkdw(i,j) |
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& + (1. _d 0-fractRunOff)*grdWexcess |
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land_runOff(i,j,bi,bj) = land_runOff(i,j,bi,bj) |
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& + fractRunOff*grdWexcess |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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ENDDO |
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C-- step forward ground Water: end |
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ENDIF |
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|
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#endif /* ALLOW_LAND */ |
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|
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RETURN |
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END |
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