MODULE sbcssr !!====================================================================== !! *** MODULE sbcssr *** !! Surface module : heat and fresh water fluxes a restoring term toward observed SST/SSS !!====================================================================== !! History : 3.0 ! 2006-06 (G. Madec) Original code !! 3.2 ! 2009-04 (B. Lemaire) Introduce iom_put !!---------------------------------------------------------------------- !!---------------------------------------------------------------------- !! sbc_ssr : add to sbc a restoring term toward SST/SSS climatology !! sbc_ssr_init : initialisation of surface restoring !!---------------------------------------------------------------------- USE oce ! ocean dynamics and tracers USE dom_oce ! ocean space and time domain USE sbc_oce ! surface boundary condition USE phycst ! physical constants USE sbcrnf ! surface boundary condition : runoffs ! USE fldread ! read input fields USE iom ! I/O manager USE in_out_manager ! I/O manager USE lib_mpp ! distribued memory computing library USE lbclnk ! ocean lateral boundary conditions (or mpp link) USE timing ! Timing USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) IMPLICIT NONE PRIVATE PUBLIC sbc_ssr ! routine called in sbcmod PUBLIC sbc_ssr_init ! routine called in sbcmod REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: erp !: evaporation damping [kg/m2/s] REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: qrp !: heat flux damping [w/m2] ! !!* Namelist namsbc_ssr * INTEGER, PUBLIC :: nn_sstr ! SST/SSS restoring indicator INTEGER, PUBLIC :: nn_sssr ! SST/SSS restoring indicator REAL(wp) :: rn_dqdt ! restoring factor on SST and SSS REAL(wp) :: rn_deds ! restoring factor on SST and SSS LOGICAL :: ln_sssr_bnd ! flag to bound erp term REAL(wp) :: rn_sssr_bnd ! ABS(Max./Min.) value of erp term [mm/day] LOGICAL :: ln_UKMO_haney ! UKMO specific flag to calculate Haney forcing REAL(wp) , ALLOCATABLE, DIMENSION(:) :: buffer ! Temporary buffer for exchange TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_sst ! structure of input SST (file informations, fields read) TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_sss ! structure of input SSS (file informations, fields read) !! * Substitutions # include "domzgr_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OPA 4.0 , NEMO Consortium (2011) !! $Id$ !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE sbc_ssr( kt ) !!--------------------------------------------------------------------- !! *** ROUTINE sbc_ssr *** !! !! ** Purpose : Add to heat and/or freshwater fluxes a damping term !! toward observed SST and/or SSS. !! !! ** Method : - Read namelist namsbc_ssr !! - Read observed SST and/or SSS !! - at each nscb time step !! add a retroaction term on qns (nn_sstr = 1) !! add a damping term on sfx (nn_sssr = 1) !! add a damping term on emp (nn_sssr = 2) !!--------------------------------------------------------------------- INTEGER, INTENT(in ) :: kt ! ocean time step !! INTEGER :: ji, jj ! dummy loop indices REAL(wp) :: zerp ! local scalar for evaporation damping REAL(wp) :: zqrp ! local scalar for heat flux damping REAL(wp) :: zsrp ! local scalar for unit conversion of rn_deds factor REAL(wp) :: zerp_bnd ! local scalar for unit conversion of rn_epr_max factor INTEGER :: ierror ! return error code !! REAL(wp) :: sst1,sst2 ! sea surface temperature REAL(wp) :: e_sst1, e_sst2 ! saturation vapour pressure REAL(wp) :: qs1,qs2 ! specific humidity REAL(wp) :: pr_tmp ! temporary variable for pressure REAL(wp), DIMENSION(jpi,jpj) :: hny_frc1 ! Haney forcing for sensible heat, correction for latent heat REAL(wp), DIMENSION(jpi,jpj) :: hny_frc2 ! Haney forcing for sensible heat, correction for latent heat !! CHARACTER(len=100) :: cn_dir ! Root directory for location of ssr files TYPE(FLD_N) :: sn_sst, sn_sss ! informations about the fields to be read !!---------------------------------------------------------------------- ! IF( nn_timing == 1 ) CALL timing_start('sbc_ssr') ! IF( nn_sstr + nn_sssr /= 0 ) THEN ! IF( nn_sstr == 1) CALL fld_read( kt, nn_fsbc, sf_sst ) ! Read SST data and provides it at kt IF( nn_sssr >= 1) CALL fld_read( kt, nn_fsbc, sf_sss ) ! Read SSS data and provides it at kt ! ! ! ========================= ! IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN ! Add restoring term ! ! ! ========================= ! ! IF( nn_sstr == 1 ) THEN !* Temperature restoring term IF( ln_UKMO_haney ) THEN DO jj = 1, jpj DO ji = 1, jpi sst1 = sst_m(ji,jj) sst2 = sf_sst(1)%fnow(ji,jj,1) e_sst1 = 10**((0.7859+0.03477*sst1)/(1.+0.00412*sst1)) e_sst2 = 10**((0.7859+0.03477*sst2)/(1.+0.00412*sst2)) pr_tmp = 0.01*pressnow(ji,jj) !pr_tmp = 1012.0 qs1 = (0.62197*e_sst1)/(pr_tmp-0.378*e_sst1) qs2 = (0.62197*e_sst2)/(pr_tmp-0.378*e_sst2) hny_frc1(ji,jj) = sst1-sst2 hny_frc2(ji,jj) = qs1-qs2 !Might need to mask off land points. hny_frc1(ji,jj)=-hny_frc1(ji,jj)*wndm(ji,jj)*1.42 hny_frc2(ji,jj)=-hny_frc2(ji,jj)*wndm(ji,jj)*4688.0 qns(ji,jj)=qns(ji,jj)+hny_frc1(ji,jj)+hny_frc2(ji,jj) qrp(ji,jj) = 0.e0 END DO END DO ELSE DO jj = 1, jpj DO ji = 1, jpi zqrp = rn_dqdt * ( sst_m(ji,jj) - sf_sst(1)%fnow(ji,jj,1) ) qns(ji,jj) = qns(ji,jj) + zqrp qrp(ji,jj) = zqrp END DO END DO ENDIF CALL iom_put( "qrp", qrp ) ! heat flux damping ENDIF ! IF( nn_sssr == 1 ) THEN !* Salinity damping term (salt flux only (sfx)) zsrp = rn_deds / rday ! from [mm/day] to [kg/m2/s] !CDIR COLLAPSE DO jj = 1, jpj DO ji = 1, jpi zerp = zsrp * ( 1. - 2.*rnfmsk(ji,jj) ) & ! No damping in vicinity of river mouths & * ( sss_m(ji,jj) - sf_sss(1)%fnow(ji,jj,1) ) sfx(ji,jj) = sfx(ji,jj) + zerp ! salt flux erp(ji,jj) = zerp / MAX( sss_m(ji,jj), 1.e-20 ) ! converted into an equivalent volume flux (diagnostic only) END DO END DO CALL iom_put( "erp", erp ) ! freshwater flux damping ! ELSEIF( nn_sssr == 2 ) THEN !* Salinity damping term (volume flux (emp) and associated heat flux (qns) zsrp = rn_deds / rday ! from [mm/day] to [kg/m2/s] zerp_bnd = rn_sssr_bnd / rday ! - - !CDIR COLLAPSE DO jj = 1, jpj DO ji = 1, jpi zerp = zsrp * ( 1. - 2.*rnfmsk(ji,jj) ) & ! No damping in vicinity of river mouths & * ( sss_m(ji,jj) - sf_sss(1)%fnow(ji,jj,1) ) & & / MAX( sss_m(ji,jj), 1.e-20 ) IF( ln_sssr_bnd ) zerp = SIGN( 1., zerp ) * MIN( zerp_bnd, ABS(zerp) ) emp(ji,jj) = emp (ji,jj) + zerp qns(ji,jj) = qns(ji,jj) - zerp * rcp * sst_m(ji,jj) erp(ji,jj) = zerp END DO END DO CALL iom_put( "erp", erp ) ! freshwater flux damping ENDIF ! ENDIF ! ENDIF ! IF( nn_timing == 1 ) CALL timing_stop('sbc_ssr') ! END SUBROUTINE sbc_ssr SUBROUTINE sbc_ssr_init !!--------------------------------------------------------------------- !! *** ROUTINE sbc_ssr_init *** !! !! ** Purpose : initialisation of surface damping term !! !! ** Method : - Read namelist namsbc_ssr !! - Read observed SST and/or SSS if required !!--------------------------------------------------------------------- INTEGER :: ji, jj ! dummy loop indices REAL(wp) :: zerp ! local scalar for evaporation damping REAL(wp) :: zqrp ! local scalar for heat flux damping REAL(wp) :: zsrp ! local scalar for unit conversion of rn_deds factor REAL(wp) :: zerp_bnd ! local scalar for unit conversion of rn_epr_max factor INTEGER :: ierror ! return error code !! CHARACTER(len=100) :: cn_dir ! Root directory for location of ssr files TYPE(FLD_N) :: sn_sst, sn_sss ! informations about the fields to be read NAMELIST/namsbc_ssr/ cn_dir, nn_sstr, nn_sssr, rn_dqdt, rn_deds, sn_sst, sn_sss, ln_sssr_bnd, rn_sssr_bnd, ln_UKMO_haney INTEGER :: ios !!---------------------------------------------------------------------- ! REWIND( numnam_ref ) ! Namelist namsbc_ssr in reference namelist : READ ( numnam_ref, namsbc_ssr, IOSTAT = ios, ERR = 901) 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_ssr in reference namelist', lwp ) REWIND( numnam_cfg ) ! Namelist namsbc_ssr in configuration namelist : READ ( numnam_cfg, namsbc_ssr, IOSTAT = ios, ERR = 902 ) 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_ssr in configuration namelist', lwp ) IF(lwm) WRITE ( numond, namsbc_ssr ) IF(lwp) THEN !* control print WRITE(numout,*) WRITE(numout,*) 'sbc_ssr : SST and/or SSS damping term ' WRITE(numout,*) '~~~~~~~ ' WRITE(numout,*) ' Namelist namsbc_ssr :' WRITE(numout,*) ' SST restoring term (Yes=1) nn_sstr = ', nn_sstr WRITE(numout,*) ' SSS damping term (Yes=1, salt flux) nn_sssr = ', nn_sssr WRITE(numout,*) ' (Yes=2, volume flux) ' WRITE(numout,*) ' dQ/dT (restoring magnitude on SST) rn_dqdt = ', rn_dqdt, ' W/m2/K' WRITE(numout,*) ' dE/dS (restoring magnitude on SST) rn_deds = ', rn_deds, ' mm/day' WRITE(numout,*) ' flag to bound erp term ln_sssr_bnd = ', ln_sssr_bnd WRITE(numout,*) ' ABS(Max./Min.) erp threshold rn_sssr_bnd = ', rn_sssr_bnd, ' mm/day' WRITE(numout,*) ' Haney forcing ln_UKMO_haney = ', ln_UKMO_haney ENDIF ! ! !* Allocate erp and qrp array ALLOCATE( qrp(jpi,jpj), erp(jpi,jpj), STAT=ierror ) IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_ssr: unable to allocate erp and qrp array' ) ! IF( nn_sstr == 1 ) THEN !* set sf_sst structure & allocate arrays ! ALLOCATE( sf_sst(1), STAT=ierror ) IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_ssr: unable to allocate sf_sst structure' ) ALLOCATE( sf_sst(1)%fnow(jpi,jpj,1), STAT=ierror ) IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_ssr: unable to allocate sf_sst now array' ) ! ! fill sf_sst with sn_sst and control print CALL fld_fill( sf_sst, (/ sn_sst /), cn_dir, 'sbc_ssr', 'SST restoring term toward SST data', 'namsbc_ssr' ) IF( sf_sst(1)%ln_tint ) ALLOCATE( sf_sst(1)%fdta(jpi,jpj,1,2), STAT=ierror ) IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_ssr: unable to allocate sf_sst data array' ) ! ENDIF ! IF( nn_sssr >= 1 ) THEN !* set sf_sss structure & allocate arrays ! ALLOCATE( sf_sss(1), STAT=ierror ) IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_ssr: unable to allocate sf_sss structure' ) ALLOCATE( sf_sss(1)%fnow(jpi,jpj,1), STAT=ierror ) IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_ssr: unable to allocate sf_sss now array' ) ! ! fill sf_sss with sn_sss and control print CALL fld_fill( sf_sss, (/ sn_sss /), cn_dir, 'sbc_ssr', 'SSS restoring term toward SSS data', 'namsbc_ssr' ) IF( sf_sss(1)%ln_tint ) ALLOCATE( sf_sss(1)%fdta(jpi,jpj,1,2), STAT=ierror ) IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_ssr: unable to allocate sf_sss data array' ) ! ENDIF ! ! !* Initialize qrp and erp if no restoring IF( nn_sstr /= 1 ) qrp(:,:) = 0._wp IF( nn_sssr /= 1 .OR. nn_sssr /= 2 ) erp(:,:) = 0._wp ! END SUBROUTINE sbc_ssr_init !!====================================================================== END MODULE sbcssr