MODULE sbcblk_clio !!====================================================================== !! *** MODULE sbcblk_clio *** !! Ocean forcing: bulk thermohaline forcing of the ocean (or ice) !!===================================================================== !! History : OPA ! 1997-06 (Louvain-La-Neuve) Original code !! ! 2001-04 (C. Ethe) add flx_blk_declin !! NEMO 2.0 ! 2002-08 (C. Ethe, G. Madec) F90: Free form and module !! 3.0 ! 2008-03 (C. Talandier, G. Madec) surface module + LIM3 !!---------------------------------------------------------------------- !! sbc_blk_clio : CLIO bulk formulation: read and update required input fields !! blk_clio_oce : ocean CLIO bulk formulea: compute momentum, heat and freswater fluxes for the ocean !! blk_ice_clio : ice CLIO bulk formulea: compute momentum, heat and freswater fluxes for the sea-ice !! blk_clio_qsr_oce : shortwave radiation for ocean computed from the cloud cover !! blk_clio_qsr_ice : shortwave radiation for ice computed from the cloud cover !! flx_blk_declin : solar declinaison !!---------------------------------------------------------------------- USE oce ! ocean dynamics and tracers USE dom_oce ! ocean space and time domain USE phycst ! physical constants USE daymod ! calendar USE ocfzpt ! ocean freezing point USE fldread ! read input fields USE sbc_oce ! Surface boundary condition: ocean fields USE iom ! I/O manager library USE in_out_manager ! I/O manager USE lib_mpp ! distribued memory computing library USE lbclnk ! ocean lateral boundary conditions (or mpp link) USE albedo USE prtctl ! Print control #if defined key_lim3 USE par_ice USE ice USE ice_oce ! For ice surface temperature #elif defined key_lim2 USE par_ice_2 USE ice_2 #endif IMPLICIT NONE PRIVATE PUBLIC sbc_blk_clio ! routine called by sbcmod.F90 PUBLIC blk_ice_clio ! routine called by sbcice_lim.F90 INTEGER , PARAMETER :: jpfld = 7 ! maximum number of files to read INTEGER , PARAMETER :: jp_utau = 1 ! index of wind stress (i-component) (N/m2) at U-point INTEGER , PARAMETER :: jp_vtau = 2 ! index of wind stress (j-component) (N/m2) at V-point INTEGER , PARAMETER :: jp_wndm = 3 ! index of 10m wind module (m/s) at T-point INTEGER , PARAMETER :: jp_humi = 4 ! index of specific humidity ( % ) INTEGER , PARAMETER :: jp_ccov = 5 ! index of cloud cover ( % ) INTEGER , PARAMETER :: jp_tair = 6 ! index of 10m air temperature (Kelvin) INTEGER , PARAMETER :: jp_prec = 7 ! index of total precipitation (rain+snow) (Kg/m2/s) TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read) INTEGER, PARAMETER :: jpintsr = 24 ! number of time step between sunrise and sunset ! ! uses for heat flux computation LOGICAL :: lbulk_init = .TRUE. ! flag, bulk initialization done or not) REAL(wp) :: cai = 1.40e-3 ! best estimate of atm drag in order to get correct FS export in ORCA2-LIM REAL(wp) :: cao = 1.00e-3 ! chosen by default ==> should depends on many things... !!gmto be updated REAL(wp) :: yearday !: number of days per year REAL(wp) :: rdtbs2 !: number of days per year REAL(wp), DIMENSION(19) :: budyko ! BUDYKO's coefficient (cloudiness effect on LW radiation) DATA budyko / 1.00, 0.98, 0.95, 0.92, 0.89, 0.86, 0.83, 0.80, 0.78, 0.75, & & 0.72, 0.69, 0.67, 0.64, 0.61, 0.58, 0.56, 0.53, 0.50 / REAL(wp), DIMENSION(20) :: tauco ! cloud optical depth coefficient DATA tauco / 6.6, 6.6, 7.0, 7.2, 7.1, 6.8, 6.5, 6.6, 7.1, 7.6, & & 6.6, 6.1, 5.6, 5.5, 5.8, 5.8, 5.6, 5.6, 5.6, 5.6 / !! REAL(wp), DIMENSION(jpi,jpj) :: sbudyko ! cloudiness effect on LW radiation REAL(wp), DIMENSION(jpi,jpj) :: stauc ! cloud optical depth REAL(wp) :: zeps = 1.e-20 ! constant values REAL(wp) :: zeps0 = 1.e-13 # include "vectopt_loop_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OPA 3.0 , LOCEAN-IPSL (2008) !! $Id:$ !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE sbc_blk_clio( kt ) !!--------------------------------------------------------------------- !! *** ROUTINE sbc_blk_clio *** !! !! ** Purpose : provide at each time step the surface ocean fluxes !! (momentum, heat, freshwater and runoff) !! !! ** Method : READ each fluxes in NetCDF files !! The i-component of the stress utau (N/m2) !! The j-component of the stress vtau (N/m2) !! the net downward heat flux qtot (watt/m2) !! the net downward radiative flux qsr (watt/m2) !! the net upward water (evapo - precip) emp (kg/m2/s) !! Assumptions made: !! - each file content an entire year (read record, not the time axis) !! - first and last record are part of the previous and next year !! (useful for time interpolation) !! - the number of records is 2 + 365*24 / freqh(jf) !! or 366 in leap year case !! !! C A U T I O N : never mask the surface stress fields !! the stress is assumed to be in the mesh referential !! i.e. the (i,j) referential !! !! ** Action : defined at each time-step at the air-sea interface !! - utau & vtau : stress components in geographical ref. !! - qns & qsr : non solar and solar heat fluxes !! - emp : evap - precip (volume flux) !! - emps : evap - precip (concentration/dillution) !!---------------------------------------------------------------------- INTEGER, INTENT( in ) :: kt ! ocean time step !! INTEGER :: jf, ifpr, jfpr ! dummy indices INTEGER :: ierror ! return error code !! CHARACTER(len=100) :: cn_dir ! Root directory for location of CLIO files TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read TYPE(FLD_N) :: sn_utau, sn_vtau, sn_wndm, sn_tair ! informations about the fields to be read TYPE(FLD_N) :: sn_humi, sn_ccov, sn_prec ! " " !! NAMELIST/namsbc_clio/ cn_dir, sn_utau, sn_vtau, sn_wndm, sn_humi, & & sn_ccov, sn_tair, sn_prec !!--------------------------------------------------------------------- ! ! ====================== ! IF( kt == nit000 ) THEN ! First call kt=nit000 ! ! ! ====================== ! ! set file information (default values) cn_dir = './' ! directory in which the model is executed ! (NB: frequency positive => hours, negative => months) ! ! file ! frequency ! variable ! time intep ! clim ! starting ! ! ! name ! (hours) ! name ! (T/F) ! (0/1) ! record ! sn_utau = FLD_N( 'utau' , 24. , 'utau' , .true. , 0 , 0 ) sn_vtau = FLD_N( 'vtau' , 24. , 'vtau' , .true. , 0 , 0 ) sn_wndm = FLD_N( 'mwnd10m' , 24. , 'm_10' , .true. , 0 , 0 ) sn_tair = FLD_N( 'tair10m' , 24. , 't_10' , .FALSE. , 0 , 0 ) sn_humi = FLD_N( 'humi10m' , 24. , 'q_10' , .FALSE. , 0 , 0 ) sn_ccov = FLD_N( 'ccover' , -12. , 'cloud' , .TRUE. , 0 , 0 ) sn_prec = FLD_N( 'precip' , -12. , 'precip' , .TRUE. , 0 , 0 ) REWIND( numnam ) ! ... read in namlist namsbc_clio READ ( numnam, namsbc_clio ) ! store namelist information in an array slf_i(jp_utau) = sn_utau ; slf_i(jp_vtau) = sn_vtau ; slf_i(jp_wndm) = sn_wndm slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi slf_i(jp_ccov) = sn_ccov ; slf_i(jp_prec) = sn_prec ! set sf structure ALLOCATE( sf(jpfld), STAT=ierror ) IF( ierror > 0 ) THEN CALL ctl_stop( 'sbc_blk_clio: unable to allocate sf structure' ) ; RETURN ENDIF ! DO jf = 1, jpfld WRITE(sf(jf)%clrootname,'(a,a)' ) TRIM( cn_dir ), TRIM( slf_i(jf)%clname ) sf(jf)%freqh = slf_i(jf)%freqh sf(jf)%clvar = slf_i(jf)%clvar sf(jf)%ln_tint = slf_i(jf)%ln_tint sf(jf)%nclim = slf_i(jf)%nclim sf(jf)%nstrec = slf_i(jf)%nstrec END DO IF(lwp) THEN ! control print WRITE(numout,*) WRITE(numout,*) 'sbc_blk_clio : flux formulattion for ocean surface boundary condition' WRITE(numout,*) '~~~~~~~~~~~~ ' WRITE(numout,*) ' namsbc_clio Namelist' WRITE(numout,*) ' list of files and frequency (>0: in hours ; <0 in months)' DO jf = 1, jpfld WRITE(numout,*) ' file root name: ' , TRIM( sf(jf)%clrootname ), & & ' variable name: ' , TRIM( sf(jf)%clvar ) WRITE(numout,*) ' frequency: ' , sf(jf)%freqh , & & ' time interp: ' , sf(jf)%ln_tint , & & ' climatology: ' , sf(jf)%nclim , & & ' starting record: ', sf(jf)%nstrec END DO ENDIF ! ENDIF ! ! ====================== ! ! ! At each time-step ! ! ! ====================== ! ! CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step ! #if defined key_lim3 tatm_ice(:,:) = sf(jp_tair)%fnow(:,:) !RB ugly patch #endif ! IF(lwp .AND. nitend-nit000 <= 100 ) THEN IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN WRITE(numout,*) WRITE(numout,*) ' read monthly CLIO fluxes: ok, kt: ', kt WRITE(numout,*) ifpr = INT(jpi/8) ; jfpr = INT(jpj/10) WRITE(numout,*) TRIM(sf(jp_utau)%clvar),' day: ',ndastp CALL prihre( sf(jp_utau)%fnow,jpi,jpj,1,jpi,ifpr,1,jpj,jfpr,0.,numout ) WRITE(numout,*) WRITE(numout,*) TRIM(sf(jp_vtau)%clvar),' day: ',ndastp CALL prihre( sf(jp_vtau)%fnow,jpi,jpj,1,jpi,ifpr,1,jpj,jfpr,0.,numout ) WRITE(numout,*) WRITE(numout,*) TRIM(sf(jp_humi)%clvar),' day: ',ndastp CALL prihre( sf(jp_humi)%fnow,jpi,jpj,1,jpi,ifpr,1,jpj,jfpr,0.,numout ) WRITE(numout,*) WRITE(numout,*) TRIM(sf(jp_wndm)%clvar),' day: ',ndastp CALL prihre( sf(jp_wndm)%fnow,jpi,jpj,1,jpi,ifpr,1,jpj,jfpr,0.,numout ) WRITE(numout,*) WRITE(numout,*) TRIM(sf(jp_ccov)%clvar),' day: ',ndastp CALL prihre( sf(jp_ccov)%fnow,jpi,jpj,1,jpi,ifpr,1,jpj,jfpr,0.,numout ) WRITE(numout,*) WRITE(numout,*) TRIM(sf(jp_prec)%clvar),' day: ',ndastp CALL prihre( sf(jp_prec)%fnow,jpi,jpj,1,jpi,ifpr,1,jpj,jfpr,0.,numout ) WRITE(numout,*) WRITE(numout,*) TRIM(sf(jp_tair)%clvar),' day: ',ndastp CALL prihre( sf(jp_tair)%fnow,jpi,jpj,1,jpi,ifpr,1,jpj,jfpr,0.,numout ) WRITE(numout,*) ENDIF ENDIF IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN CALL blk_oce_clio( sst_m, ssu_m, ssv_m ) ! compute the surface ocean fluxes using CLIO bulk formulea ENDIF ! ! END SUBROUTINE sbc_blk_clio SUBROUTINE blk_oce_clio( pst, pu, pv ) !!--------------------------------------------------------------------------- !! *** ROUTINE blk_oce_clio *** !! !! ** Purpose : Compute momentum, heat and freshwater fluxes at ocean surface !! using CLIO bulk formulea !! !! ** Method : The flux of heat at the ocean surfaces are derived !! from semi-empirical ( or bulk ) formulae which relate the flux to !! the properties of the surface and of the lower atmosphere. Here, we !! follow the work of Oberhuber, 1988 !! - momentum flux (stresses) directly read in files at U- and V-points !! - compute ocean/ice albedos (call albedo_oce/albedo_ice) !! - compute shortwave radiation for ocean (call blk_clio_qsr_oce) !! - compute long-wave radiation for the ocean !! - compute the turbulent heat fluxes over the ocean !! - deduce the evaporation over the ocean !! ** Action : Fluxes over the ocean: !! - utau, vtau i- and j-component of the wind stress !! - qns, qsr non-slor and solar heat flux !! - emp, emps evaporation minus precipitation !!---------------------------------------------------------------------- REAL(wp), INTENT(in), DIMENSION(jpi,jpj) :: pst ! surface temperature [Celcius] REAL(wp), INTENT(in), DIMENSION(jpi,jpj) :: pu ! surface current at U-point (i-component) [m/s] REAL(wp), INTENT(in), DIMENSION(jpi,jpj) :: pv ! surface current at V-point (j-component) [m/s] !! INTEGER :: ji, jj ! dummy loop indices !! REAL(wp) :: zrhova, zcsho, zcleo, zcldeff ! temporary scalars REAL(wp) :: zqsato, zdteta, zdeltaq, ztvmoy, zobouks ! - - REAL(wp) :: zpsims, zpsihs, zpsils, zobouku, zxins, zpsimu ! - - REAL(wp) :: zpsihu, zpsilu, zstab,zpsim, zpsih, zpsil ! - - REAL(wp) :: zvatmg, zcmn, zchn, zcln, zcmcmn, zdenum ! - - REAL(wp) :: zdtetar, ztvmoyr, zlxins, zchcm, zclcm ! - - REAL(wp) :: zmt1, zmt2, zmt3, ztatm3, ztamr, ztaevbk ! - - REAL(wp) :: zsst, ztatm, zcco1, zpatm, zinda ! - - REAL(wp) :: zrhoa, zev, zes, zeso, zqatm, zevsqr ! - - !! REAL(wp), DIMENSION(jpi,jpj) :: zqlw ! long-wave heat flux over ocean REAL(wp), DIMENSION(jpi,jpj) :: zqla ! latent heat flux over ocean REAL(wp), DIMENSION(jpi,jpj) :: zqsb ! sensible heat flux over ocean !!--------------------------------------------------------------------- zpatm = 101000. ! atmospheric pressure (assumed constant here) !------------------------------------! ! momentum fluxes (utau, vtau ) ! !------------------------------------! !CDIR COLLAPSE DO jj = 1 , jpj DO ji = 1, jpi utau(ji,jj) = sf(jp_utau)%fnow(ji,jj) vtau(ji,jj) = sf(jp_vtau)%fnow(ji,jj) END DO END DO !------------------------------------------------! ! Shortwave radiation for ocean and snow/ice ! !------------------------------------------------! CALL blk_clio_qsr_oce( qsr ) ! CAUTION: ocean shortwave radiation sets to zero if more than 50% of sea-ice !!gm to be removed DO jj = 1, jpj DO ji = 1, jpi zinda = MAX( 0.e0, SIGN( 1.e0, -( -1.5 - freeze(ji,jj) ) ) ) qsr(ji,jj) = zinda * qsr(ji,jj) END DO END DO !------------------------! ! Other ocean fluxes ! !------------------------! !CDIR NOVERRCHK !CDIR COLLAPSE DO jj = 1, jpj !CDIR NOVERRCHK DO ji = 1, jpi ! zsst = pst(ji,jj) + rt0 ! converte Celcius to Kelvin the SST and Tair ztatm = sf(jp_tair)%fnow(ji,jj) + rt0 ! and set minimum value far above 0 K (=rt0 over land) zcco1 = 1.0 - sf(jp_ccov)%fnow(ji,jj) ! fraction of clear sky ( 1 - cloud cover) zrhoa = zpatm / ( 287.04 * ztatm ) ! air density (equation of state for dry air) ztamr = ztatm - rtt ! Saturation water vapour zmt1 = SIGN( 17.269, ztamr ) ! || zmt2 = SIGN( 21.875, ztamr ) ! \ / zmt3 = SIGN( 28.200, -ztamr ) ! \/ zes = 611.0 * EXP( ABS( ztamr ) * MIN ( zmt1, zmt2 ) / ( ztatm - 35.86 + MAX( 0.e0, zmt3 ) ) ) zev = sf(jp_humi)%fnow(ji,jj) * zes ! vapour pressure zevsqr = SQRT( zev * 0.01 ) ! square-root of vapour pressure zqatm = 0.622 * zev / ( zpatm - 0.378 * zev ) ! specific humidity !--------------------------------------! ! long-wave radiation over the ocean ! ( Berliand 1952 ; all latitudes ) !--------------------------------------! ztatm3 = ztatm * ztatm * ztatm zcldeff = 1.0 - sbudyko(ji,jj) * sf(jp_ccov)%fnow(ji,jj) * sf(jp_ccov)%fnow(ji,jj) ztaevbk = ztatm * ztatm3 * zcldeff * ( 0.39 - 0.05 * zevsqr ) ! zqlw(ji,jj) = - emic * stefan * ( ztaevbk + 4. * ztatm3 * ( zsst - ztatm ) ) !-------------------------------------------------- ! Latent and sensible heat fluxes over the ocean !-------------------------------------------------- ! ! vapour pressure at saturation of ocean zeso = 611.0 * EXP ( 17.2693884 * ( zsst - rtt ) * tmask(ji,jj,1) / ( zsst - 35.86 ) ) zqsato = ( 0.622 * zeso ) / ( zpatm - 0.378 * zeso ) ! humidity close to the ocean surface (at saturation) ! Drag coefficients from Large and Pond (1981,1982) ! ! Stability parameters zdteta = zsst - ztatm zdeltaq = zqatm - zqsato ztvmoy = ztatm * ( 1. + 2.2e-3 * ztatm * zqatm ) zdenum = MAX( sf(jp_wndm)%fnow(ji,jj) * sf(jp_wndm)%fnow(ji,jj) * ztvmoy, zeps ) zdtetar = zdteta / zdenum ztvmoyr = ztvmoy * ztvmoy * zdeltaq / zdenum ! ! case of stable atmospheric conditions zobouks = -70.0 * 10. * ( zdtetar + 3.2e-3 * ztvmoyr ) zobouks = MAX( 0.e0, zobouks ) zpsims = -7.0 * zobouks zpsihs = zpsims zpsils = zpsims ! ! case of unstable atmospheric conditions zobouku = MIN( 0.e0, -100.0 * 10.0 * ( zdtetar + 2.2e-3 * ztvmoyr ) ) zxins = ( 1. - 16. * zobouku )**0.25 zlxins = LOG( ( 1. + zxins * zxins ) / 2. ) zpsimu = 2. * LOG( ( 1 + zxins ) * 0.5 ) + zlxins - 2. * ATAN( zxins ) + rpi * 0.5 zpsihu = 2. * zlxins zpsilu = zpsihu ! ! intermediate values zstab = MAX( 0.e0, SIGN( 1.e0, zdteta ) ) zpsim = zstab * zpsimu + ( 1.0 - zstab ) * zpsims zpsih = zstab * zpsihu + ( 1.0 - zstab ) * zpsihs zpsil = zpsih zvatmg = MAX( 0.032 * 1.5e-3 * sf(jp_wndm)%fnow(ji,jj) * sf(jp_wndm)%fnow(ji,jj) / grav, zeps ) zcmn = vkarmn / LOG ( 10. / zvatmg ) zchn = 0.0327 * zcmn zcln = 0.0346 * zcmn zcmcmn = 1. / ( 1. - zcmn * zpsim / vkarmn ) zchcm = zcmcmn / ( 1. - zchn * zpsih / ( vkarmn * zcmn ) ) zclcm = zchcm ! ! transfert coef. (Large and Pond 1981,1982) zcsho = zchn * zchcm zcleo = zcln * zclcm zrhova = zrhoa * sf(jp_wndm)%fnow(ji,jj) ! sensible heat flux zqsb(ji,jj) = zrhova * zcsho * 1004.0 * ( zsst - ztatm ) ! latent heat flux (bounded by zero) zqla(ji,jj) = MAX( 0.e0, zrhova * zcleo * 2.5e+06 * ( zqsato - zqatm ) ) ! END DO END DO ! ----------------------------------------------------------------------------- ! ! III Total FLUXES ! ! ----------------------------------------------------------------------------- ! !CDIR COLLAPSE qns (:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) ! Downward Non Solar flux !CDIR COLLAPSE emp (:,:) = zqla(:,:) / cevap - sf(jp_prec)%fnow(:,:) / rday * tmask(:,:,1) !CDIR COLLAPSE emps(:,:) = emp(:,:) ! IF(ln_ctl) THEN CALL prt_ctl(tab2d_1=zqsb , clinfo1=' blk_oce_clio: zqsb : ', tab2d_2=zqlw , clinfo2=' zqlw : ') CALL prt_ctl(tab2d_1=zqla , clinfo1=' blk_oce_clio: zqla : ', tab2d_2=qsr , clinfo2=' qsr : ') CALL prt_ctl(tab2d_1=pst , clinfo1=' blk_oce_clio: pst : ', tab2d_2=emp , clinfo2=' emp : ') CALL prt_ctl(tab2d_1=utau , clinfo1=' blk_oce_clio: utau : ', mask1=umask, & & tab2d_2=vtau , clinfo2=' vtau : ', mask2=vmask ) ENDIF END SUBROUTINE blk_oce_clio SUBROUTINE blk_ice_clio( pst , pui , pvi , palb_cs, palb_os , & & p_taui, p_tauj, p_qns , p_qsr, & & p_qla , p_dqns, p_dqla, & & p_tpr , p_spr , & & p_fr1 , p_fr2 , cd_grid ) !!--------------------------------------------------------------------------- !! *** ROUTINE blk_ice_clio *** !! !! ** Purpose : Computation of the heat fluxes at ocean and snow/ice !! surface the solar heat at ocean and snow/ice surfaces and the !! sensitivity of total heat fluxes to the SST variations !! !! ** Method : The flux of heat at the ice and ocean surfaces are derived !! from semi-empirical ( or bulk ) formulae which relate the flux to !! the properties of the surface and of the lower atmosphere. Here, we !! follow the work of Oberhuber, 1988 !! !! ** Action : call albedo_oce/albedo_ice to compute ocean/ice albedo !! computation of snow precipitation !! computation of solar flux at the ocean and ice surfaces !! computation of the long-wave radiation for the ocean and sea/ice !! computation of turbulent heat fluxes over water and ice !! computation of evaporation over water !! computation of total heat fluxes sensitivity over ice (dQ/dT) !! computation of latent heat flux sensitivity over ice (dQla/dT) !! !!---------------------------------------------------------------------- REAL(wp), INTENT(in ), DIMENSION(:,:,:) :: pst ! ice surface temperature [Kelvin] REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: pui ! ice surface velocity (i-component, I-point) [m/s] REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: pvi ! ice surface velocity (j-component, I-point) [m/s] REAL(wp), INTENT(in ), DIMENSION(:,:,:) :: palb_cs ! ice albedo (clear sky) (alb_ice_cs) [%] REAL(wp), INTENT(in ), DIMENSION(:,:,:) :: palb_os ! ice albedo (overcast sky) (alb_ice_os) [%] REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_taui ! surface ice stress at I-point (i-component) [N/m2] REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_tauj ! surface ice stress at I-point (j-component) [N/m2] REAL(wp), INTENT( out), DIMENSION(:,:,:) :: p_qns ! non solar heat flux over ice (T-point) [W/m2] REAL(wp), INTENT( out), DIMENSION(:,:,:) :: p_qsr ! solar heat flux over ice (T-point) [W/m2] REAL(wp), INTENT( out), DIMENSION(:,:,:) :: p_qla ! latent heat flux over ice (T-point) [W/m2] REAL(wp), INTENT( out), DIMENSION(:,:,:) :: p_dqns ! non solar heat sensistivity (T-point) [W/m2] REAL(wp), INTENT( out), DIMENSION(:,:,:) :: p_dqla ! latent heat sensistivity (T-point) [W/m2] REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_tpr ! total precipitation (T-point) [Kg/m2/s] REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_spr ! solid precipitation (T-point) [Kg/m2/s] REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_fr1 ! 1sr fraction of qsr penetration in ice [%] REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_fr2 ! 2nd fraction of qsr penetration in ice [%] CHARACTER(len=1), INTENT(in ) :: cd_grid ! type of sea-ice grid ("C" or "B" grid) !! INTEGER :: ji, jj, jl ! dummy loop indices INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays) !! REAL(wp) :: zcoef, zmt1, zmt2, zmt3, ztatm3 ! temporary scalars REAL(wp) :: ztaevbk, zind1, zind2, zind3, ztamr ! - - REAL(wp) :: zesi, zqsati, zdesidt ! - - REAL(wp) :: zdqla, zcldeff, zev, zes, zpatm, zrhova ! - - REAL(wp) :: zcshi, zclei, zrhovaclei, zrhovacshi ! - - REAL(wp) :: ztice3, zticemb, zticemb2, zdqlw, zdqsb ! - - !! REAL(wp), DIMENSION(jpi,jpj) :: ztatm ! Tair in Kelvin REAL(wp), DIMENSION(jpi,jpj) :: zqatm ! specific humidity REAL(wp), DIMENSION(jpi,jpj) :: zevsqr ! vapour pressure square-root REAL(wp), DIMENSION(jpi,jpj) :: zrhoa ! air density REAL(wp), DIMENSION(jpi,jpj,SIZE(pst,3)) :: z_qlw, z_qsb !!--------------------------------------------------------------------- ijpl = SIZE( pst, 3 ) ! number of ice categories zpatm = 101000. ! atmospheric pressure (assumed constant here) !------------------------------------! ! momentum fluxes (utau, vtau ) ! !------------------------------------! SELECT CASE( cd_grid ) CASE( 'C' ) ! C-grid ice dynamics ! Change from wind speed to wind stress over OCEAN (cao is used) zcoef = cai / cao !CDIR COLLAPSE DO jj = 1 , jpj DO ji = 1, jpi p_taui(ji,jj) = zcoef * utau(ji,jj) p_tauj(ji,jj) = zcoef * vtau(ji,jj) END DO END DO CASE( 'B' ) ! B-grid ice dynamics ! stress from ocean U- and V-points to ice U,V point !CDIR COLLAPSE DO jj = 2, jpj DO ji = fs_2, jpi ! vector opt. p_taui(ji,jj) = 0.5 * ( utau(ji-1,jj ) + utau(ji-1,jj-1) ) p_tauj(ji,jj) = 0.5 * ( vtau(ji ,jj-1) + vtau(ji-1,jj-1) ) END DO END DO CALL lbc_lnk( p_taui(:,:), 'I', -1. ) ! I-point (i.e. ice U-V point) CALL lbc_lnk( p_tauj(:,:), 'I', -1. ) ! I-point (i.e. ice U-V point) END SELECT ! Determine cloud optical depths as a function of latitude (Chou et al., 1981). ! and the correction factor for taking into account the effect of clouds !------------------------------------------------------ !CDIR NOVERRCHK !CDIR COLLAPSE DO jj = 1, jpj !CDIR NOVERRCHK DO ji = 1, jpi ztatm (ji,jj) = sf(jp_tair)%fnow(ji,jj) + rt0 ! air temperature in Kelvins zrhoa(ji,jj) = zpatm / ( 287.04 * ztatm(ji,jj) ) ! air density (equation of state for dry air) ztamr = ztatm(ji,jj) - rtt ! Saturation water vapour zmt1 = SIGN( 17.269, ztamr ) zmt2 = SIGN( 21.875, ztamr ) zmt3 = SIGN( 28.200, -ztamr ) zes = 611.0 * EXP( ABS( ztamr ) * MIN ( zmt1, zmt2 ) & & / ( ztatm(ji,jj) - 35.86 + MAX( 0.e0, zmt3 ) ) ) zev = sf(jp_humi)%fnow(ji,jj) * zes ! vapour pressure zevsqr(ji,jj) = SQRT( zev * 0.01 ) ! square-root of vapour pressure zqatm(ji,jj) = 0.622 * zev / ( zpatm - 0.378 * zev ) ! specific humidity !---------------------------------------------------- ! Computation of snow precipitation (Ledley, 1985) | !---------------------------------------------------- zmt1 = 253.0 - ztatm(ji,jj) ; zind1 = MAX( 0.e0, SIGN( 1.e0, zmt1 ) ) zmt2 = ( 272.0 - ztatm(ji,jj) ) / 38.0 ; zind2 = MAX( 0.e0, SIGN( 1.e0, zmt2 ) ) zmt3 = ( 281.0 - ztatm(ji,jj) ) / 18.0 ; zind3 = MAX( 0.e0, SIGN( 1.e0, zmt3 ) ) p_spr(ji,jj) = sf(jp_prec)%fnow(ji,jj) / rday & ! rday = converte mm/day to kg/m2/s & * ( zind1 & ! solid (snow) precipitation [kg/m2/s] & + ( 1.0 - zind1 ) * ( zind2 * ( 0.5 + zmt2 ) & & + ( 1.0 - zind2 ) * zind3 * zmt3 ) ) !----------------------------------------------------! ! fraction of net penetrative shortwave radiation ! !----------------------------------------------------! ! fraction of qsr_ice which is NOT absorbed in the thin surface layer ! and thus which penetrates inside the ice cover ( Maykut and Untersteiner, 1971 ; Elbert anbd Curry, 1993 ) p_fr1(ji,jj) = 0.18 * ( 1.e0 - sf(jp_ccov)%fnow(ji,jj) ) + 0.35 * sf(jp_ccov)%fnow(ji,jj) p_fr2(ji,jj) = 0.82 * ( 1.e0 - sf(jp_ccov)%fnow(ji,jj) ) + 0.65 * sf(jp_ccov)%fnow(ji,jj) END DO END DO !-----------------------------------------------------------! ! snow/ice Shortwave radiation (abedo already computed) ! !-----------------------------------------------------------! CALL blk_clio_qsr_ice( palb_cs, palb_os, p_qsr ) ! ! ========================== ! DO jl = 1, ijpl ! Loop over ice categories ! ! ! ========================== ! !CDIR NOVERRCHK !CDIR COLLAPSE DO jj = 1 , jpj !CDIR NOVERRCHK DO ji = 1, jpi !-------------------------------------------! ! long-wave radiation over ice categories ! ( Berliand 1952 ; all latitudes ) !-------------------------------------------! ztatm3 = ztatm(ji,jj) * ztatm(ji,jj) * ztatm(ji,jj) zcldeff = 1.0 - sbudyko(ji,jj) * sf(jp_ccov)%fnow(ji,jj) * sf(jp_ccov)%fnow(ji,jj) ztaevbk = ztatm3 * ztatm(ji,jj) * zcldeff * ( 0.39 - 0.05 * zevsqr(ji,jj) ) ! z_qlw(ji,jj,jl) = - emic * stefan * ( ztaevbk + 4. * ztatm3 * ( pst(ji,jj,jl) - ztatm(ji,jj) ) ) !---------------------------------------- ! Turbulent heat fluxes over snow/ice ( Latent and sensible ) !---------------------------------------- ! vapour pressure at saturation of ice (tmask to avoid overflow in the exponential) zesi = 611.0 * EXP( 21.8745587 * tmask(ji,jj,1) * ( pst(ji,jj,jl) - rtt )/ ( pst(ji,jj,jl) - 7.66 ) ) ! humidity close to the ice surface (at saturation) zqsati = ( 0.622 * zesi ) / ( zpatm - 0.378 * zesi ) ! computation of intermediate values zticemb = pst(ji,jj,jl) - 7.66 zticemb2 = zticemb * zticemb ztice3 = pst(ji,jj,jl) * pst(ji,jj,jl) * pst(ji,jj,jl) zdesidt = zesi * ( 9.5 * LOG( 10.0 ) * ( rtt - 7.66 ) / zticemb2 ) ! Transfer cofficients assumed to be constant (Parkinson 1979 ; Maykut 1982) zcshi = 1.75e-03 zclei = zcshi ! sensible and latent fluxes over ice zrhova = zrhoa(ji,jj) * sf(jp_wndm)%fnow(ji,jj) ! computation of intermediate values zrhovaclei = zrhova * zcshi * 2.834e+06 zrhovacshi = zrhova * zclei * 1004.0 ! sensible heat flux z_qsb(ji,jj,jl) = zrhovacshi * ( pst(ji,jj,jl) - ztatm(ji,jj) ) ! latent heat flux p_qla(ji,jj,jl) = MAX( 0.e0, zrhovaclei * ( zqsati - zqatm(ji,jj) ) ) ! sensitivity of non solar fluxes (dQ/dT) (long-wave, sensible and latent fluxes) zdqlw = 4.0 * emic * stefan * ztice3 zdqsb = zrhovacshi zdqla = zrhovaclei * ( zdesidt * ( zqsati * zqsati / ( zesi * zesi ) ) * ( zpatm / 0.622 ) ) ! p_dqla(ji,jj,jl) = zdqla ! latent flux sensitivity p_dqns(ji,jj,jl) = -( zdqlw + zdqsb + zdqla ) ! total non solar sensitivity END DO ! END DO ! END DO ! ! ----------------------------------------------------------------------------- ! ! Total FLUXES ! ! ----------------------------------------------------------------------------- ! ! !CDIR COLLAPSE p_qns(:,:,:) = z_qlw (:,:,:) - z_qsb (:,:,:) - p_qla (:,:,:) ! Downward Non Solar flux !CDIR COLLAPSE p_tpr(:,:) = sf(jp_prec)%fnow(:,:) / rday ! total precipitation [kg/m2/s] ! !!gm : not necessary as all input data are lbc_lnk... CALL lbc_lnk( p_fr1 (:,:) , 'T', 1. ) CALL lbc_lnk( p_fr2 (:,:) , 'T', 1. ) DO jl = 1, ijpl CALL lbc_lnk( p_qns (:,:,jl) , 'T', 1. ) CALL lbc_lnk( p_dqns(:,:,jl) , 'T', 1. ) CALL lbc_lnk( p_qla (:,:,jl) , 'T', 1. ) CALL lbc_lnk( p_dqla(:,:,jl) , 'T', 1. ) END DO !!gm : mask is not required on forcing DO jl = 1, ijpl p_qns (:,:,jl) = p_qns (:,:,jl) * tmask(:,:,1) p_qla (:,:,jl) = p_qla (:,:,jl) * tmask(:,:,1) p_dqns(:,:,jl) = p_dqns(:,:,jl) * tmask(:,:,1) p_dqla(:,:,jl) = p_dqla(:,:,jl) * tmask(:,:,1) END DO IF(ln_ctl) THEN CALL prt_ctl(tab3d_1=z_qsb , clinfo1=' blk_ice_clio: z_qsb : ', tab3d_2=z_qlw , clinfo2=' z_qlw : ', kdim=ijpl) CALL prt_ctl(tab3d_1=p_qla , clinfo1=' blk_ice_clio: z_qla : ', tab3d_2=p_qsr , clinfo2=' p_qsr : ', kdim=ijpl) CALL prt_ctl(tab3d_1=p_dqns , clinfo1=' blk_ice_clio: p_dqns : ', tab3d_2=p_qns , clinfo2=' p_qns : ', kdim=ijpl) CALL prt_ctl(tab3d_1=p_dqla , clinfo1=' blk_ice_clio: p_dqla : ', tab3d_2=pst , clinfo2=' pst : ', kdim=ijpl) CALL prt_ctl(tab2d_1=p_tpr , clinfo1=' blk_ice_clio: p_tpr : ', tab2d_2=p_spr , clinfo2=' p_spr : ') CALL prt_ctl(tab2d_1=p_taui , clinfo1=' blk_ice_clio: p_taui : ', tab2d_2=p_tauj , clinfo2=' p_tauj : ') ENDIF END SUBROUTINE blk_ice_clio SUBROUTINE blk_clio_qsr_oce( pqsr_oce ) !!--------------------------------------------------------------------------- !! *** ROUTINE blk_clio_qsr_oce *** !! !! ** Purpose : Computation of the shortwave radiation at the ocean and the !! snow/ice surfaces. !! !! ** Method : - computed qsr from the cloud cover for both ice and ocean !! - also initialise sbudyko and stauc once for all !!---------------------------------------------------------------------- REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: pqsr_oce ! shortwave radiation over the ocean !! INTEGER, PARAMETER :: jp24 = 24 ! sampling of the daylight period (sunrise to sunset) into 24 equal parts !! INTEGER :: ji, jj, jt ! dummy loop indices INTEGER :: indaet ! = -1, 0, 1 for odd, normal and leap years resp. INTEGER :: iday ! integer part of day INTEGER :: indxb, indxc ! index for cloud depth coefficient REAL(wp) :: zalat , zclat, zcmue, zcmue2 ! local scalars REAL(wp) :: zmt1, zmt2, zmt3 ! REAL(wp) :: zdecl, zsdecl , zcdecl ! REAL(wp) :: za_oce, ztamr ! REAL(wp) :: zdl, zlha ! local scalars REAL(wp) :: zlmunoon, zcldcor, zdaycor ! REAL(wp) :: zxday, zdist, zcoef, zcoef1 ! REAL(wp) :: zes !! REAL(wp), DIMENSION(jpi,jpj) :: zev ! vapour pressure REAL(wp), DIMENSION(jpi,jpj) :: zdlha, zlsrise, zlsset ! 2D workspace REAL(wp), DIMENSION(jpi,jpj) :: zps, zpc ! sine (cosine) of latitude per sine (cosine) of solar declination !!--------------------------------------------------------------------- IF( lbulk_init ) THEN ! Initilization at first time step only rdtbs2 = nn_fsbc * rdt * 0.5 ! cloud optical depths as a function of latitude (Chou et al., 1981). ! and the correction factor for taking into account the effect of clouds DO jj = 1, jpj DO ji = 1 , jpi zalat = ( 90.e0 - ABS( gphit(ji,jj) ) ) / 5.e0 zclat = ( 95.e0 - gphit(ji,jj) ) / 10.e0 indxb = 1 + INT( zalat ) indxc = 1 + INT( zclat ) zdl = zclat - INT( zclat ) ! correction factor to account for the effect of clouds sbudyko(ji,jj) = budyko(indxb) stauc (ji,jj) = ( 1.e0 - zdl ) * tauco( indxc ) + zdl * tauco( indxc + 1 ) END DO END DO IF ( nleapy == 1 ) THEN ; yearday = 366.e0 ELSEIF( nleapy == 0 ) THEN ; yearday = 365.e0 ELSEIF( nleapy == 30) THEN ; yearday = 360.e0 ENDIF lbulk_init = .FALSE. ENDIF ! Saturated water vapour and vapour pressure ! ------------------------------------------ !CDIR NOVERRCHK !CDIR COLLAPSE DO jj = 1, jpj !CDIR NOVERRCHK DO ji = 1, jpi ztamr = sf(jp_tair)%fnow(ji,jj) + rt0 - rtt zmt1 = SIGN( 17.269, ztamr ) zmt2 = SIGN( 21.875, ztamr ) zmt3 = SIGN( 28.200, -ztamr ) zes = 611.0 * EXP( ABS( ztamr ) * MIN ( zmt1, zmt2 ) & ! Saturation water vapour & / ( sf(jp_tair)%fnow(ji,jj) + rt0 - 35.86 + MAX( 0.e0, zmt3 ) ) ) zev(ji,jj) = sf(jp_humi)%fnow(ji,jj) * zes * 1.0e-05 ! vapour pressure END DO END DO !-----------------------------------! ! Computation of solar irradiance ! !-----------------------------------! !!gm : hard coded leap year ??? indaet = 1 ! = -1, 0, 1 for odd, normal and leap years resp. zxday = nday_year + rdtbs2 / rday ! day of the year at which the fluxes are calculated iday = INT( zxday ) ! (centred at the middle of the ice time step) CALL flx_blk_declin( indaet, iday, zdecl ) ! solar declination of the current day zsdecl = SIN( zdecl * rad ) ! its sine zcdecl = COS( zdecl * rad ) ! its cosine ! correction factor added for computation of shortwave flux to take into account the variation of ! the distance between the sun and the earth during the year (Oberhuber 1988) zdist = zxday * 2. * rpi / yearday zdaycor = 1.0 + 0.0013 * SIN( zdist ) + 0.0342 * COS( zdist ) !CDIR NOVERRCHK DO jj = 1, jpj !CDIR NOVERRCHK DO ji = 1, jpi ! product of sine (cosine) of latitude and sine (cosine) of solar declination zps(ji,jj) = SIN( gphit(ji,jj) * rad ) * zsdecl zpc(ji,jj) = COS( gphit(ji,jj) * rad ) * zcdecl ! computation of the both local time of sunrise and sunset zlsrise(ji,jj) = ACOS( - SIGN( 1.e0, zps(ji,jj) ) & & * MIN( 1.e0, SIGN( 1.e0, zps(ji,jj) ) * ( zps(ji,jj) / zpc(ji,jj) ) ) ) zlsset (ji,jj) = - zlsrise(ji,jj) ! dividing the solar day into jp24 segments of length zdlha zdlha (ji,jj) = ( zlsrise(ji,jj) - zlsset(ji,jj) ) / REAL( jp24 ) END DO END DO !---------------------------------------------! ! shortwave radiation absorbed by the ocean ! !---------------------------------------------! pqsr_oce(:,:) = 0.e0 ! set ocean qsr to zero ! compute and sum ocean qsr over the daylight (i.e. between sunrise and sunset) !CDIR NOVERRCHK DO jt = 1, jp24 zcoef = FLOAT( jt ) - 0.5 !CDIR NOVERRCHK !CDIR COLLAPSE DO jj = 1, jpj !CDIR NOVERRCHK DO ji = 1, jpi zlha = COS( zlsrise(ji,jj) - zcoef * zdlha(ji,jj) ) ! local hour angle zcmue = MAX( 0.e0 , zps(ji,jj) + zpc(ji,jj) * zlha ) ! cos of local solar altitude zcmue2 = 1368.0 * zcmue * zcmue ! ocean albedo depending on the cloud cover (Payne, 1972) za_oce = ( 1.0 - sf(jp_ccov)%fnow(ji,jj) ) * 0.05 / ( 1.1 * zcmue**1.4 + 0.15 ) & ! clear sky & + sf(jp_ccov)%fnow(ji,jj) * 0.06 ! overcast ! solar heat flux absorbed by the ocean (Zillman, 1972) pqsr_oce(ji,jj) = pqsr_oce(ji,jj) & & + ( 1.0 - za_oce ) * zdlha(ji,jj) * zcmue2 & & / ( ( zcmue + 2.7 ) * zev(ji,jj) + 1.085 * zcmue + 0.10 ) END DO END DO END DO ! Taking into account the ellipsity of the earth orbit, the clouds AND masked if sea-ice cover > 0% zcoef1 = srgamma * zdaycor / ( 2. * rpi ) !CDIR COLLAPSE DO jj = 1, jpj DO ji = 1, jpi zlmunoon = ASIN( zps(ji,jj) + zpc(ji,jj) ) / rad ! local noon solar altitude zcldcor = MIN( 1.e0, ( 1.e0 - 0.62 * sf(jp_ccov)%fnow(ji,jj) & ! cloud correction (Reed 1977) & + 0.0019 * zlmunoon ) ) pqsr_oce(ji,jj) = zcoef1 * zcldcor * pqsr_oce(ji,jj) * tmask(ji,jj,1) ! and zcoef1: ellipsity END DO END DO END SUBROUTINE blk_clio_qsr_oce SUBROUTINE blk_clio_qsr_ice( pa_ice_cs, pa_ice_os, pqsr_ice ) !!--------------------------------------------------------------------------- !! *** ROUTINE blk_clio_qsr_ice *** !! !! ** Purpose : Computation of the shortwave radiation at the ocean and the !! snow/ice surfaces. !! !! ** Method : - computed qsr from the cloud cover for both ice and ocean !! - also initialise sbudyko and stauc once for all !!---------------------------------------------------------------------- REAL(wp), INTENT(in ), DIMENSION(:,:,:) :: pa_ice_cs ! albedo of ice under clear sky REAL(wp), INTENT(in ), DIMENSION(:,:,:) :: pa_ice_os ! albedo of ice under overcast sky REAL(wp), INTENT( out), DIMENSION(:,:,:) :: pqsr_ice ! shortwave radiation over the ice/snow !! INTEGER, PARAMETER :: jp24 = 24 ! sampling of the daylight period (sunrise to sunset) into 24 equal parts !! INTEGER :: ji, jj, jl, jt ! dummy loop indices INTEGER :: ijpl ! number of ice categories (3rd dim of pqsr_ice) INTEGER :: indaet ! = -1, 0, 1 for odd, normal and leap years resp. INTEGER :: iday ! integer part of day !! REAL(wp) :: zcmue, zcmue2, ztamr ! temporary scalars REAL(wp) :: zmt1, zmt2, zmt3 ! - - REAL(wp) :: zdecl, zsdecl, zcdecl ! - - REAL(wp) :: zlha, zdaycor, zes ! - - REAL(wp) :: zxday, zdist, zcoef, zcoef1 ! - - REAL(wp) :: zqsr_ice_cs, zqsr_ice_os ! - - !! REAL(wp), DIMENSION(jpi,jpj) :: zev ! vapour pressure REAL(wp), DIMENSION(jpi,jpj) :: zdlha, zlsrise, zlsset ! 2D workspace REAL(wp), DIMENSION(jpi,jpj) :: zps, zpc ! sine (cosine) of latitude per sine (cosine) of solar declination !!--------------------------------------------------------------------- ijpl = SIZE(pqsr_ice, 3 ) ! number of ice categories ! Saturated water vapour and vapour pressure ! ------------------------------------------ !CDIR NOVERRCHK !CDIR COLLAPSE DO jj = 1, jpj !CDIR NOVERRCHK DO ji = 1, jpi ztamr = sf(jp_tair)%fnow(ji,jj) + rt0 - rtt zmt1 = SIGN( 17.269, ztamr ) zmt2 = SIGN( 21.875, ztamr ) zmt3 = SIGN( 28.200, -ztamr ) zes = 611.0 * EXP( ABS( ztamr ) * MIN ( zmt1, zmt2 ) & ! Saturation water vapour & / ( sf(jp_tair)%fnow(ji,jj) + rt0 - 35.86 + MAX( 0.e0, zmt3 ) ) ) zev(ji,jj) = sf(jp_humi)%fnow(ji,jj) * zes * 1.0e-05 ! vapour pressure END DO END DO !-----------------------------------! ! Computation of solar irradiance ! !-----------------------------------! !!gm : hard coded leap year ??? indaet = 1 ! = -1, 0, 1 for odd, normal and leap years resp. zxday = nday_year + rdtbs2 / rday ! day of the year at which the fluxes are calculated iday = INT( zxday ) ! (centred at the middle of the ice time step) CALL flx_blk_declin( indaet, iday, zdecl ) ! solar declination of the current day zsdecl = SIN( zdecl * rad ) ! its sine zcdecl = COS( zdecl * rad ) ! its cosine ! correction factor added for computation of shortwave flux to take into account the variation of ! the distance between the sun and the earth during the year (Oberhuber 1988) zdist = zxday * 2. * rpi / yearday zdaycor = 1.0 + 0.0013 * SIN( zdist ) + 0.0342 * COS( zdist ) !CDIR NOVERRCHK DO jj = 1, jpj !CDIR NOVERRCHK DO ji = 1, jpi ! product of sine (cosine) of latitude and sine (cosine) of solar declination zps(ji,jj) = SIN( gphit(ji,jj) * rad ) * zsdecl zpc(ji,jj) = COS( gphit(ji,jj) * rad ) * zcdecl ! computation of the both local time of sunrise and sunset zlsrise(ji,jj) = ACOS( - SIGN( 1.e0, zps(ji,jj) ) & & * MIN( 1.e0, SIGN( 1.e0, zps(ji,jj) ) * ( zps(ji,jj) / zpc(ji,jj) ) ) ) zlsset (ji,jj) = - zlsrise(ji,jj) ! dividing the solar day into jp24 segments of length zdlha zdlha (ji,jj) = ( zlsrise(ji,jj) - zlsset(ji,jj) ) / REAL( jp24 ) END DO END DO !---------------------------------------------! ! shortwave radiation absorbed by the ice ! !---------------------------------------------! ! compute and sum ice qsr over the daylight for each ice categories pqsr_ice(:,:,:) = 0.e0 zcoef1 = zdaycor / ( 2. * rpi ) ! Correction for the ellipsity of the earth orbit ! !----------------------------! DO jl = 1, ijpl ! loop over ice categories ! ! !----------------------------! !CDIR NOVERRCHK DO jt = 1, jp24 zcoef = FLOAT( jt ) - 0.5 !CDIR NOVERRCHK !CDIR COLLAPSE DO jj = 1, jpj !CDIR NOVERRCHK DO ji = 1, jpi zlha = COS( zlsrise(ji,jj) - zcoef * zdlha(ji,jj) ) ! local hour angle zcmue = MAX( 0.e0 , zps(ji,jj) + zpc(ji,jj) * zlha ) ! cos of local solar altitude zcmue2 = 1368.0 * zcmue * zcmue ! solar heat flux absorbed by the ice/snow system (Shine and Crane 1984 adapted to high albedo) zqsr_ice_cs = ( 1.0 - pa_ice_cs(ji,jj,jl) ) * zdlha(ji,jj) * zcmue2 & ! clear sky & / ( ( 1.0 + zcmue ) * zev(ji,jj) + 1.2 * zcmue + 0.0455 ) zqsr_ice_os = zdlha(ji,jj) * SQRT( zcmue ) & ! overcast sky & * ( 53.5 + 1274.5 * zcmue ) * ( 1.0 - 0.996 * pa_ice_os(ji,jj,jl) ) & & / ( 1.0 + 0.139 * stauc(ji,jj) * ( 1.0 - 0.9435 * pa_ice_os(ji,jj,jl) ) ) pqsr_ice(ji,jj,jl) = pqsr_ice(ji,jj,jl) + ( ( 1.0 - sf(jp_ccov)%fnow(ji,jj) ) * zqsr_ice_cs & & + sf(jp_ccov)%fnow(ji,jj) * zqsr_ice_os ) END DO END DO END DO ! ! Correction : Taking into account the ellipsity of the earth orbit pqsr_ice(:,:,jl) = pqsr_ice(:,:,jl) * zcoef1 * tmask(:,:,1) ! ! !--------------------------------! END DO ! end loop over ice categories ! ! !--------------------------------! !!gm : this should be suppress as input data have been passed through lbc_lnk DO jl = 1, ijpl CALL lbc_lnk( pqsr_ice(:,:,jl) , 'T', 1. ) END DO ! END SUBROUTINE blk_clio_qsr_ice SUBROUTINE flx_blk_declin( ky, kday, pdecl ) !!--------------------------------------------------------------------------- !! *** ROUTINE flx_blk_declin *** !! !! ** Purpose : Computation of the solar declination for the day !! !! ** Method : ??? !!--------------------------------------------------------------------- INTEGER , INTENT(in ) :: ky ! = -1, 0, 1 for odd, normal and leap years resp. INTEGER , INTENT(in ) :: kday ! day of the year ( kday = 1 on january 1) REAL(wp), INTENT( out) :: pdecl ! solar declination !! REAL(wp) :: a0 = 0.39507671 ! coefficients for solar declinaison computation REAL(wp) :: a1 = 22.85684301 ! " "" " REAL(wp) :: a2 = -0.38637317 ! " "" " REAL(wp) :: a3 = 0.15096535 ! " "" " REAL(wp) :: a4 = -0.00961411 ! " "" " REAL(wp) :: b1 = -4.29692073 ! " "" " REAL(wp) :: b2 = 0.05702074 ! " "" " REAL(wp) :: b3 = -0.09028607 ! " "" " REAL(wp) :: b4 = 0.00592797 !! REAL(wp) :: zday ! corresponding day of type year (cf. ky) REAL(wp) :: zp ! temporary scalars !!--------------------------------------------------------------------- IF ( ky == 1 ) THEN ; zday = REAL( kday ) - 0.5 ELSEIF( ky == 3 ) THEN ; zday = REAL( kday ) - 1. ELSE ; zday = REAL( kday ) ENDIF zp = rpi * ( 2.0 * zday - 367.0 ) / yearday pdecl = a0 & & + a1 * COS( zp ) + a2 * COS( 2. * zp ) + a3 * COS( 3. * zp ) + a4 * COS( 4. * zp ) & & + b1 * SIN( zp ) + b2 * SIN( 2. * zp ) + b3 * SIN( 3. * zp ) + b4 * SIN( 4. * zp ) ! END SUBROUTINE flx_blk_declin !!====================================================================== END MODULE sbcblk_clio