! ! $Header$ ! MODULE fonte_neige_mod ! ! This module will treat the process of snow, melting, accumulating, calving, in ! case of simplified soil model. ! !**************************************************************************************** USE dimphy, ONLY : klon USE indice_sol_mod IMPLICIT NONE SAVE ! run_off_ter and run_off_lic are the runoff at the compressed grid knon for ! land and land-ice respectively ! Note: run_off_lic is used in mod_landice and therfore not private REAL, ALLOCATABLE, DIMENSION(:), PRIVATE :: run_off_ter !$OMP THREADPRIVATE(run_off_ter) REAL, ALLOCATABLE, DIMENSION(:) :: run_off_lic !$OMP THREADPRIVATE(run_off_lic) ! run_off_lic_0 is the runoff at land-ice a time-step earlier, on the global 1D array grid REAL, ALLOCATABLE, DIMENSION(:), PRIVATE :: run_off_lic_0 !$OMP THREADPRIVATE(run_off_lic_0) REAL, PRIVATE :: tau_calv !$OMP THREADPRIVATE(tau_calv) REAL, ALLOCATABLE, DIMENSION(:,:), PRIVATE :: ffonte_global !$OMP THREADPRIVATE(ffonte_global) REAL, ALLOCATABLE, DIMENSION(:,:), PRIVATE :: fqfonte_global !$OMP THREADPRIVATE(fqfonte_global) REAL, ALLOCATABLE, DIMENSION(:,:), PRIVATE :: fqcalving_global !$OMP THREADPRIVATE(fqcalving_global) REAL, ALLOCATABLE, DIMENSION(:), PRIVATE :: runofflic_global !$OMP THREADPRIVATE(runofflic_global) CONTAINS ! !**************************************************************************************** ! SUBROUTINE fonte_neige_init(restart_runoff) ! This subroutine allocates and initialize variables in the module. ! The variable run_off_lic_0 is initialized to the field read from ! restart file. The other variables are initialized to zero. ! !**************************************************************************************** ! Input argument REAL, DIMENSION(klon), INTENT(IN) :: restart_runoff ! Local variables INTEGER :: error CHARACTER (len = 80) :: abort_message CHARACTER (len = 20) :: modname = 'fonte_neige_init' !**************************************************************************************** ! Allocate run-off at landice and initilize with field read from restart ! !**************************************************************************************** ALLOCATE(run_off_lic_0(klon), stat = error) IF (error /= 0) THEN abort_message='Pb allocation run_off_lic' CALL abort_physic(modname,abort_message,1) ENDIF run_off_lic_0(:) = restart_runoff(:) !**************************************************************************************** ! Allocate other variables and initilize to zero ! !**************************************************************************************** ALLOCATE(run_off_ter(klon), stat = error) IF (error /= 0) THEN abort_message='Pb allocation run_off_ter' CALL abort_physic(modname,abort_message,1) ENDIF run_off_ter(:) = 0. ALLOCATE(run_off_lic(klon), stat = error) IF (error /= 0) THEN abort_message='Pb allocation run_off_lic' CALL abort_physic(modname,abort_message,1) ENDIF run_off_lic(:) = 0. ALLOCATE(ffonte_global(klon,nbsrf)) IF (error /= 0) THEN abort_message='Pb allocation ffonte_global' CALL abort_physic(modname,abort_message,1) ENDIF ffonte_global(:,:) = 0.0 ALLOCATE(fqfonte_global(klon,nbsrf)) IF (error /= 0) THEN abort_message='Pb allocation fqfonte_global' CALL abort_physic(modname,abort_message,1) ENDIF fqfonte_global(:,:) = 0.0 ALLOCATE(fqcalving_global(klon,nbsrf)) IF (error /= 0) THEN abort_message='Pb allocation fqcalving_global' CALL abort_physic(modname,abort_message,1) ENDIF fqcalving_global(:,:) = 0.0 ALLOCATE(runofflic_global(klon)) IF (error /= 0) THEN abort_message='Pb allocation runofflic_global' CALL abort_physic(modname,abort_message,1) ENDIF runofflic_global(:) = 0.0 !**************************************************************************************** ! Read tau_calv ! !**************************************************************************************** CALL conf_interface(tau_calv) END SUBROUTINE fonte_neige_init ! !**************************************************************************************** ! SUBROUTINE fonte_neige( knon, nisurf, knindex, dtime, & tsurf, precip_rain, precip_snow, & snow, qsol, tsurf_new, evap) USE indice_sol_mod ! Routine de traitement de la fonte de la neige dans le cas du traitement ! de sol simplifie! ! LF 03/2001 ! input: ! knon nombre de points a traiter ! nisurf surface a traiter ! knindex index des mailles valables pour surface a traiter ! dtime ! tsurf temperature de surface ! precip_rain precipitations liquides ! precip_snow precipitations solides ! ! input/output: ! snow champs hauteur de neige ! qsol hauteur d'eau contenu dans le sol ! tsurf_new temperature au sol ! evap ! INCLUDE "YOETHF.h" INCLUDE "YOMCST.h" INCLUDE "FCTTRE.h" INCLUDE "clesphys.h" ! Input variables !**************************************************************************************** INTEGER, INTENT(IN) :: knon INTEGER, INTENT(IN) :: nisurf INTEGER, DIMENSION(klon), INTENT(IN) :: knindex REAL , INTENT(IN) :: dtime REAL, DIMENSION(klon), INTENT(IN) :: tsurf REAL, DIMENSION(klon), INTENT(IN) :: precip_rain REAL, DIMENSION(klon), INTENT(IN) :: precip_snow ! Input/Output variables !**************************************************************************************** REAL, DIMENSION(klon), INTENT(INOUT) :: snow REAL, DIMENSION(klon), INTENT(INOUT) :: qsol REAL, DIMENSION(klon), INTENT(INOUT) :: tsurf_new REAL, DIMENSION(klon), INTENT(INOUT) :: evap ! Local variables !**************************************************************************************** INTEGER :: i, j REAL :: fq_fonte REAL :: coeff_rel REAL, PARAMETER :: snow_max=3000. REAL, PARAMETER :: max_eau_sol = 150.0 !! PB temporaire en attendant mieux pour le modele de neige ! REAL, parameter :: chasno = RLMLT/(2.3867E+06*0.15) REAL, PARAMETER :: chasno = 3.334E+05/(2.3867E+06*0.15) !IM cf JLD/ GKtest REAL, PARAMETER :: chaice = 3.334E+05/(2.3867E+06*0.15) ! fin GKtest REAL, DIMENSION(klon) :: ffonte REAL, DIMENSION(klon) :: fqcalving, fqfonte REAL, DIMENSION(klon) :: d_ts REAL, DIMENSION(klon) :: bil_eau_s, snow_evap LOGICAL :: neige_fond !**************************************************************************************** ! Start calculation ! - Initialization ! !**************************************************************************************** coeff_rel = dtime/(tau_calv * rday) bil_eau_s(:) = 0. !**************************************************************************************** ! - Increment snow due to precipitation and evaporation ! - Calculate the water balance due to precipitation and evaporation (bil_eau_s) ! !**************************************************************************************** WHERE (precip_snow > 0.) snow = snow + (precip_snow * dtime) END WHERE snow_evap = 0. IF (.NOT. ok_lic_cond) THEN !---only positive evaporation has an impact on snow !---note that this could create a bit of water !---this was the default until CMIP6 WHERE (evap > 0. ) snow_evap = MIN (snow / dtime, evap) !---one cannot evaporate more than the amount of snow snow = snow - snow_evap * dtime !---snow that remains on the ground snow = MAX(0.0, snow) !---just in case END WHERE ELSE !--now considers both positive and negative evaporation in the budget of snow snow_evap = MIN (snow / dtime, evap) !---one cannot evaporate more than the amount of snow snow = snow - snow_evap * dtime !---snow that remains or deposits on the ground snow = MAX(0.0, snow) !---just in case ENDIF bil_eau_s(:) = (precip_rain(:) * dtime) - (evap(:) - snow_evap(:)) * dtime !**************************************************************************************** ! - Calculate melting snow ! - Calculate calving and decrement snow, if there are to much snow ! - Update temperature at surface ! !**************************************************************************************** ffonte(:) = 0.0 fqcalving(:) = 0.0 fqfonte(:) = 0.0 DO i = 1, knon ! Y'a-t-il fonte de neige? neige_fond = (snow(i)>epsfra .OR. nisurf==is_sic .OR. nisurf==is_lic) .AND. tsurf_new(i)>=RTT IF (neige_fond) THEN fq_fonte = MIN( MAX((tsurf_new(i)-RTT )/chasno,0.0),snow(i)) ffonte(i) = fq_fonte * RLMLT/dtime fqfonte(i) = fq_fonte/dtime snow(i) = MAX(0., snow(i) - fq_fonte) bil_eau_s(i) = bil_eau_s(i) + fq_fonte tsurf_new(i) = tsurf_new(i) - fq_fonte * chasno !IM cf JLD OK !IM cf JLD/ GKtest fonte aussi pour la glace IF (nisurf == is_sic .OR. nisurf == is_lic ) THEN fq_fonte = MAX((tsurf_new(i)-RTT )/chaice,0.0) ffonte(i) = ffonte(i) + fq_fonte * RLMLT/dtime IF ( ok_lic_melt ) THEN fqfonte(i) = fqfonte(i) + fq_fonte/dtime bil_eau_s(i) = bil_eau_s(i) + fq_fonte ENDIF tsurf_new(i) = RTT ENDIF d_ts(i) = tsurf_new(i) - tsurf(i) ENDIF ! s'il y a une hauteur trop importante de neige, elle est ecretee fqcalving(i) = MAX(0., snow(i) - snow_max)/dtime snow(i)=MIN(snow(i),snow_max) ENDDO IF (nisurf == is_ter) THEN DO i = 1, knon qsol(i) = qsol(i) + bil_eau_s(i) run_off_ter(i) = run_off_ter(i) + MAX(qsol(i) - max_eau_sol, 0.0) qsol(i) = MIN(qsol(i), max_eau_sol) ENDDO ELSE IF (nisurf == is_lic) THEN DO i = 1, knon j = knindex(i) !--temporal filtering run_off_lic(i) = coeff_rel*fqcalving(i) + (1.-coeff_rel)*run_off_lic_0(j) run_off_lic_0(j) = run_off_lic(i) !--add melting snow and liquid precip to runoff of ice cap run_off_lic(i) = run_off_lic(i) + fqfonte(i) + precip_rain(i) ENDDO ENDIF !**************************************************************************************** ! Save ffonte, fqfonte and fqcalving in global arrays for each ! sub-surface separately ! !**************************************************************************************** DO i = 1, knon ffonte_global(knindex(i),nisurf) = ffonte(i) fqfonte_global(knindex(i),nisurf) = fqfonte(i) fqcalving_global(knindex(i),nisurf) = fqcalving(i) ENDDO IF (nisurf == is_lic) THEN DO i = 1, knon runofflic_global(knindex(i)) = run_off_lic(i) ENDDO ENDIF END SUBROUTINE fonte_neige ! !**************************************************************************************** ! SUBROUTINE fonte_neige_final(restart_runoff) ! ! This subroutine returns run_off_lic_0 for later writing to restart file. ! !**************************************************************************************** REAL, DIMENSION(klon), INTENT(OUT) :: restart_runoff !**************************************************************************************** ! Set the output variables restart_runoff(:) = run_off_lic_0(:) ! Deallocation of all varaibles in the module ! DEALLOCATE(run_off_lic_0, run_off_ter, run_off_lic, ffonte_global, & ! fqfonte_global, fqcalving_global) IF (ALLOCATED(run_off_lic_0)) DEALLOCATE(run_off_lic_0) IF (ALLOCATED(run_off_ter)) DEALLOCATE(run_off_ter) IF (ALLOCATED(run_off_lic)) DEALLOCATE(run_off_lic) IF (ALLOCATED(ffonte_global)) DEALLOCATE(ffonte_global) IF (ALLOCATED(fqfonte_global)) DEALLOCATE(fqfonte_global) IF (ALLOCATED(fqcalving_global)) DEALLOCATE(fqcalving_global) IF (ALLOCATED(runofflic_global)) DEALLOCATE(runofflic_global) END SUBROUTINE fonte_neige_final ! !**************************************************************************************** ! SUBROUTINE fonte_neige_get_vars(pctsrf, fqcalving_out, & fqfonte_out, ffonte_out, run_off_lic_out) ! Cumulate ffonte, fqfonte and fqcalving respectively for ! all type of surfaces according to their fraction. ! ! This routine is called from physiq.F before histwrite. !**************************************************************************************** USE indice_sol_mod REAL, DIMENSION(klon,nbsrf), INTENT(IN) :: pctsrf REAL, DIMENSION(klon), INTENT(OUT) :: fqcalving_out REAL, DIMENSION(klon), INTENT(OUT) :: fqfonte_out REAL, DIMENSION(klon), INTENT(OUT) :: ffonte_out REAL, DIMENSION(klon), INTENT(OUT) :: run_off_lic_out INTEGER :: nisurf !**************************************************************************************** ffonte_out(:) = 0.0 fqfonte_out(:) = 0.0 fqcalving_out(:) = 0.0 DO nisurf = 1, nbsrf ffonte_out(:) = ffonte_out(:) + ffonte_global(:,nisurf)*pctsrf(:,nisurf) fqfonte_out(:) = fqfonte_out(:) + fqfonte_global(:,nisurf)*pctsrf(:,nisurf) fqcalving_out(:) = fqcalving_out(:) + fqcalving_global(:,nisurf)*pctsrf(:,nisurf) ENDDO run_off_lic_out(:)=runofflic_global(:) END SUBROUTINE fonte_neige_get_vars ! !**************************************************************************************** ! END MODULE fonte_neige_mod