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 in_out_manager ! I/O manager USE iom ! I/O manager USE lib_mpp ! distribued memory computing library USE lbclnk ! ocean lateral boundary conditions (or mpp link) 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 PUBLIC sbc_ssr_alloc ! 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] REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: coefice !: under ice relaxation coefficient ! !!* 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] INTEGER :: nn_sssr_ice ! Control of restoring under ice 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 "do_loop_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OCE 4.0 , NEMO Consortium (2018) !! $Id$ !! Software governed by the CeCILL license (see ./LICENSE) !!---------------------------------------------------------------------- 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 !! 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_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 DO_2D_11_11 zqrp = rn_dqdt * ( sst_m(ji,jj) - sf_sst(1)%fnow(ji,jj,1) ) * tmask(ji,jj,1) qns(ji,jj) = qns(ji,jj) + zqrp qrp(ji,jj) = zqrp END_2D ENDIF ! IF( nn_sssr /= 0 .AND. nn_sssr_ice /= 1 ) THEN ! use fraction of ice ( fr_i ) to adjust relaxation under ice if nn_sssr_ice .ne. 1 ! n.b. coefice is initialised and fixed to 1._wp if nn_sssr_ice = 1 DO_2D_11_11 SELECT CASE ( nn_sssr_ice ) CASE ( 0 ) ; coefice(ji,jj) = 1._wp - fr_i(ji,jj) ! no/reduced damping under ice CASE DEFAULT ; coefice(ji,jj) = 1._wp + ( nn_sssr_ice - 1 ) * fr_i(ji,jj) ! reinforced damping (x nn_sssr_ice) under ice ) END SELECT END_2D ENDIF ! IF( nn_sssr == 1 ) THEN !* Salinity damping term (salt flux only (sfx)) zsrp = rn_deds / rday ! from [mm/day] to [kg/m2/s] DO_2D_11_11 zerp = zsrp * ( 1. - 2.*rnfmsk(ji,jj) ) & ! No damping in vicinity of river mouths & * coefice(ji,jj) & ! Optional control of damping under sea-ice & * ( sss_m(ji,jj) - sf_sss(1)%fnow(ji,jj,1) ) * tmask(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_2D ! 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 ! - - DO_2D_11_11 zerp = zsrp * ( 1. - 2.*rnfmsk(ji,jj) ) & ! No damping in vicinity of river mouths & * coefice(ji,jj) & ! Optional control of damping under sea-ice & * ( sss_m(ji,jj) - sf_sss(1)%fnow(ji,jj,1) ) & & / MAX( sss_m(ji,jj), 1.e-20 ) * tmask(ji,jj,1) 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_2D ENDIF ! ENDIF ! ENDIF ! 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, nn_sssr_ice INTEGER :: ios !!---------------------------------------------------------------------- ! IF(lwp) THEN WRITE(numout,*) WRITE(numout,*) 'sbc_ssr : SST and/or SSS damping term ' WRITE(numout,*) '~~~~~~~ ' ENDIF ! READ ( numnam_ref, namsbc_ssr, IOSTAT = ios, ERR = 901) 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_ssr in reference namelist' ) READ ( numnam_cfg, namsbc_ssr, IOSTAT = ios, ERR = 902 ) 902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namsbc_ssr in configuration namelist' ) IF(lwm) WRITE ( numond, namsbc_ssr ) IF(lwp) THEN !* control print WRITE(numout,*) ' Namelist namsbc_ssr :' WRITE(numout,*) ' SST restoring term (Yes=1) nn_sstr = ', nn_sstr WRITE(numout,*) ' dQ/dT (restoring magnitude on SST) rn_dqdt = ', rn_dqdt, ' W/m2/K' WRITE(numout,*) ' SSS damping term (Yes=1, salt flux) nn_sssr = ', nn_sssr WRITE(numout,*) ' (Yes=2, volume flux) ' 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,*) ' Cntrl of surface restoration under ice nn_sssr_ice = ', nn_sssr_ice WRITE(numout,*) ' ( 0 = no restoration under ice)' WRITE(numout,*) ' ( 1 = restoration everywhere )' WRITE(numout,*) ' (>1 = enhanced restoration under ice )' ENDIF ! 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', no_print ) 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', no_print ) 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 ! coefice(:,:) = 1._wp ! Initialise coefice to 1._wp ; will not need to be changed if nn_sssr_ice=1 ! !* 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 INTEGER FUNCTION sbc_ssr_alloc() !!---------------------------------------------------------------------- !! *** FUNCTION sbc_ssr_alloc *** !!---------------------------------------------------------------------- sbc_ssr_alloc = 0 ! set to zero if no array to be allocated IF( .NOT. ALLOCATED( erp ) ) THEN ALLOCATE( qrp(jpi,jpj), erp(jpi,jpj), coefice(jpi,jpj), STAT= sbc_ssr_alloc ) ! IF( lk_mpp ) CALL mpp_sum ( 'sbcssr', sbc_ssr_alloc ) IF( sbc_ssr_alloc /= 0 ) CALL ctl_warn('sbc_ssr_alloc: failed to allocate arrays.') ! ENDIF END FUNCTION !!====================================================================== END MODULE sbcssr