MODULE istate !!====================================================================== !! *** MODULE istate *** !! Ocean state : initial state setting !!===================================================================== !! History : OPA ! 1989-12 (P. Andrich) Original code !! 5.0 ! 1991-11 (G. Madec) rewritting !! 6.0 ! 1996-01 (G. Madec) terrain following coordinates !! 8.0 ! 2001-09 (M. Levy, M. Ben Jelloul) istate_eel !! 8.0 ! 2001-09 (M. Levy, M. Ben Jelloul) istate_uvg !! NEMO 1.0 ! 2003-08 (G. Madec, C. Talandier) F90: Free form, modules + EEL R5 !! - ! 2004-05 (A. Koch-Larrouy) istate_gyre !! 2.0 ! 2006-07 (S. Masson) distributed restart using iom !! 3.3 ! 2010-10 (C. Ethe) merge TRC-TRA !! 3.4 ! 2011-04 (G. Madec) Merge of dtatem and dtasal & suppression of tb,tn/sb,sn !!---------------------------------------------------------------------- !!---------------------------------------------------------------------- !! istate_init : initial state setting !! istate_tem : analytical profile for initial Temperature !! istate_sal : analytical profile for initial Salinity !! istate_eel : initial state setting of EEL R5 configuration !! istate_gyre : initial state setting of GYRE configuration !! istate_uvg : initial velocity in geostropic balance !!---------------------------------------------------------------------- USE oce ! ocean dynamics and active tracers USE dom_oce ! ocean space and time domain USE c1d ! 1D vertical configuration USE daymod ! calendar USE eosbn2 ! eq. of state, Brunt Vaisala frequency (eos routine) USE ldftra_oce ! ocean active tracers: lateral physics USE zdf_oce ! ocean vertical physics USE phycst ! physical constants USE dtatsd ! data temperature and salinity (dta_tsd routine) USE dtauvd ! data: U & V current (dta_uvd routine) USE zpshde ! partial step: hor. derivative (zps_hde routine) USE eosbn2 ! equation of state (eos bn2 routine) USE domvvl ! varying vertical mesh USE dynspg_oce ! pressure gradient schemes USE dynspg_flt ! filtered free surface USE sol_oce ! ocean solver variables ! USE in_out_manager ! I/O manager USE iom ! I/O library USE lib_mpp ! MPP library USE restart ! restart USE wrk_nemo ! Memory allocation USE timing ! Timing IMPLICIT NONE PRIVATE PUBLIC istate_init ! routine called by step.F90 !! * Substitutions # include "domzgr_substitute.h90" # include "vectopt_loop_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OPA 3.7 , NEMO Consortium (2014) !! $Id: istate.F90 4990 2014-12-15 16:42:49Z timgraham $ !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE istate_init !!---------------------------------------------------------------------- !! *** ROUTINE istate_init *** !! !! ** Purpose : Initialization of the dynamics and tracer fields. !!---------------------------------------------------------------------- INTEGER :: ji, jj, jk ! dummy loop indices REAL(wp), POINTER, DIMENSION(:,:,:,:) :: zuvd ! U & V data workspace !!---------------------------------------------------------------------- ! IF( nn_timing == 1 ) CALL timing_start('istate_init') ! IF(lwp) WRITE(numout,*) ' ' IF(lwp) WRITE(numout,*) 'istate_ini : Initialization of the dynamics and tracers' IF(lwp) WRITE(numout,*) '~~~~~~~~~~' CALL dta_tsd_init ! Initialisation of T & S input data IF( lk_c1d ) CALL dta_uvd_init ! Initialization of U & V input data rhd (:,:,: ) = 0._wp ; rhop (:,:,: ) = 0._wp ! set one for all to 0 at level jpk rn2b (:,:,: ) = 0._wp ; rn2 (:,:,: ) = 0._wp ! set one for all to 0 at levels 1 and jpk tsa (:,:,:,:) = 0._wp ! set one for all to 0 at level jpk rab_b(:,:,:,:) = 0._wp ; rab_n(:,:,:,:) = 0._wp ! set one for all to 0 at level jpk IF( ln_rstart ) THEN ! Restart from a file ! ! ------------------- CALL rst_read ! Read the restart file CALL day_init ! model calendar (using both namelist and restart infos) ELSE ! ! Start from rest ! ! --------------- numror = 0 ! define numror = 0 -> no restart file to read neuler = 0 ! Set time-step indicator at nit000 (euler forward) CALL day_init ! model calendar (using both namelist and restart infos) ! ! Initialization of ocean to zero ! before fields ! now fields sshb (:,:) = 0._wp ; sshn (:,:) = 0._wp ub (:,:,:) = 0._wp ; un (:,:,:) = 0._wp vb (:,:,:) = 0._wp ; vn (:,:,:) = 0._wp rotb (:,:,:) = 0._wp ; rotn (:,:,:) = 0._wp hdivb(:,:,:) = 0._wp ; hdivn(:,:,:) = 0._wp ! IF( cp_cfg == 'eel' ) THEN CALL istate_eel ! EEL configuration : start from pre-defined U,V T-S fields ELSEIF( cp_cfg == 'gyre' ) THEN CALL istate_gyre ! GYRE configuration : start from pre-defined T-S fields ELSE ! Initial T-S, U-V fields read in files IF ( ln_tsd_init ) THEN ! read 3D T and S data at nit000 CALL dta_tsd( nit000, tsb ) tsn(:,:,:,:) = tsb(:,:,:,:) ! ELSE ! Initial T-S fields defined analytically CALL istate_t_s ENDIF IF ( ln_uvd_init .AND. lk_c1d ) THEN ! read 3D U and V data at nit000 CALL wrk_alloc( jpi, jpj, jpk, 2, zuvd ) CALL dta_uvd( nit000, zuvd ) ub(:,:,:) = zuvd(:,:,:,1) ; un(:,:,:) = ub(:,:,:) vb(:,:,:) = zuvd(:,:,:,2) ; vn(:,:,:) = vb(:,:,:) CALL wrk_dealloc( jpi, jpj, jpk, 2, zuvd ) ENDIF ENDIF ! CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! before potential and in situ densities #if ! defined key_c1d IF( ln_zps .AND. .NOT. ln_isfcav) & & CALL zps_hde ( nit000, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient & rhd, gru , grv ) ! of t, s, rd at the last ocean level IF( ln_zps .AND. ln_isfcav) & & CALL zps_hde_isf( nit000, jpts, tsb, gtsu, gtsv, & ! Partial steps for top cell (ISF) & rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , & & gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level #endif ! ! - ML - sshn could be modified by istate_eel, so that initialization of fse3t_b is done here IF( lk_vvl ) THEN DO jk = 1, jpk fse3t_b(:,:,jk) = fse3t_n(:,:,jk) ENDDO ENDIF ! ENDIF ! IF( lk_agrif ) THEN ! read free surface arrays in restart file IF( ln_rstart ) THEN IF( lk_dynspg_flt ) THEN ! read or initialize the following fields ! ! gcx, gcxb for agrif_opa_init IF( sol_oce_alloc() > 0 ) CALL ctl_stop('agrif sol_oce_alloc: allocation of arrays failed') CALL flt_rst( nit000, 'READ' ) ENDIF ENDIF ! explicit case not coded yet with AGRIF ENDIF ! ! ! Initialize "now" and "before" barotropic velocities: ! Do it whatever the free surface method, these arrays ! being eventually used ! ! un_b(:,:) = 0._wp ; vn_b(:,:) = 0._wp ub_b(:,:) = 0._wp ; vb_b(:,:) = 0._wp ! DO jk = 1, jpkm1 DO jj = 1, jpj DO ji = 1, jpi un_b(ji,jj) = un_b(ji,jj) + fse3u_n(ji,jj,jk) * un(ji,jj,jk) * umask(ji,jj,jk) vn_b(ji,jj) = vn_b(ji,jj) + fse3v_n(ji,jj,jk) * vn(ji,jj,jk) * vmask(ji,jj,jk) ! ub_b(ji,jj) = ub_b(ji,jj) + fse3u_b(ji,jj,jk) * ub(ji,jj,jk) * umask(ji,jj,jk) vb_b(ji,jj) = vb_b(ji,jj) + fse3v_b(ji,jj,jk) * vb(ji,jj,jk) * vmask(ji,jj,jk) END DO END DO END DO ! un_b(:,:) = un_b(:,:) * hur (:,:) vn_b(:,:) = vn_b(:,:) * hvr (:,:) ! ub_b(:,:) = ub_b(:,:) * hur_b(:,:) vb_b(:,:) = vb_b(:,:) * hvr_b(:,:) ! ! IF( nn_timing == 1 ) CALL timing_stop('istate_init') ! END SUBROUTINE istate_init SUBROUTINE istate_t_s !!--------------------------------------------------------------------- !! *** ROUTINE istate_t_s *** !! !! ** Purpose : Intialization of the temperature field with an !! analytical profile or a file (i.e. in EEL configuration) !! !! ** Method : - temperature: use Philander analytic profile !! - salinity : use to a constant value 35.5 !! !! References : Philander ??? !!---------------------------------------------------------------------- INTEGER :: ji, jj, jk REAL(wp) :: zsal = 35.50 !!---------------------------------------------------------------------- ! IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'istate_t_s : Philander s initial temperature profile' IF(lwp) WRITE(numout,*) '~~~~~~~~~~ and constant salinity (',zsal,' psu)' ! DO jk = 1, jpk tsn(:,:,jk,jp_tem) = ( ( ( 7.5 - 0. * ABS( gphit(:,:) )/30. ) * ( 1.-TANH((fsdept(:,:,jk)-80.)/30.) ) & & + 10. * ( 5000. - fsdept(:,:,jk) ) /5000.) ) * tmask(:,:,jk) tsb(:,:,jk,jp_tem) = tsn(:,:,jk,jp_tem) END DO tsn(:,:,:,jp_sal) = zsal * tmask(:,:,:) tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal) ! END SUBROUTINE istate_t_s SUBROUTINE istate_eel !!---------------------------------------------------------------------- !! *** ROUTINE istate_eel *** !! !! ** Purpose : Initialization of the dynamics and tracers for EEL R5 !! configuration (channel with or without a topographic bump) !! !! ** Method : - set temprature field !! - set salinity field !! - set velocity field including horizontal divergence !! and relative vorticity fields !!---------------------------------------------------------------------- USE divcur ! hor. divergence & rel. vorticity (div_cur routine) USE iom ! INTEGER :: inum ! temporary logical unit INTEGER :: ji, jj, jk ! dummy loop indices INTEGER :: ijloc REAL(wp) :: zh1, zh2, zslope, zcst, zfcor ! temporary scalars REAL(wp) :: zt1 = 15._wp ! surface temperature value (EEL R5) REAL(wp) :: zt2 = 5._wp ! bottom temperature value (EEL R5) REAL(wp) :: zsal = 35.0_wp ! constant salinity (EEL R2, R5 and R6) REAL(wp) :: zueel = 0.1_wp ! constant uniform zonal velocity (EEL R5) REAL(wp), DIMENSION(jpiglo,jpjglo) :: zssh ! initial ssh over the global domain !!---------------------------------------------------------------------- ! SELECT CASE ( jp_cfg ) ! ! ==================== CASE ( 5 ) ! EEL R5 configuration ! ! ==================== ! ! set temperature field with a linear profile ! ------------------------------------------- IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: linear temperature profile' IF(lwp) WRITE(numout,*) '~~~~~~~~~~' ! zh1 = gdept_1d( 1 ) zh2 = gdept_1d(jpkm1) ! zslope = ( zt1 - zt2 ) / ( zh1 - zh2 ) zcst = ( zt1 * ( zh1 - zh2) - ( zt1 - zt2 ) * zh1 ) / ( zh1 - zh2 ) ! DO jk = 1, jpk tsn(:,:,jk,jp_tem) = ( zt2 + zt1 * exp( - fsdept(:,:,jk) / 1000 ) ) * tmask(:,:,jk) tsb(:,:,jk,jp_tem) = tsn(:,:,jk,jp_tem) END DO ! IF(lwp) CALL prizre( tsn(:,:,:,jp_tem), jpi , jpj , jpk , jpj/2 , & & 1 , jpi , 5 , 1 , jpk , & & 1 , 1. , numout ) ! ! set salinity field to a constant value ! -------------------------------------- IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal IF(lwp) WRITE(numout,*) '~~~~~~~~~~' ! tsn(:,:,:,jp_sal) = zsal * tmask(:,:,:) tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal) ! ! set the dynamics: U,V, hdiv, rot (and ssh if necessary) ! ---------------- ! Start EEL5 configuration with barotropic geostrophic velocities ! according the sshb and sshn SSH imposed. ! we assume a uniform grid (hence the use of e1t(1,1) for delta_y) ! we use the Coriolis frequency at mid-channel. ub(:,:,:) = zueel * umask(:,:,:) un(:,:,:) = ub(:,:,:) ijloc = mj0(INT(jpjglo-1)/2) zfcor = ff(1,ijloc) ! DO jj = 1, jpjglo zssh(:,jj) = - (FLOAT(jj)- FLOAT(jpjglo-1)/2.)*zueel*e1t(1,1)*zfcor/grav END DO ! IF(lwp) THEN WRITE(numout,*) ' Uniform zonal velocity for EEL R5:',zueel WRITE(numout,*) ' Geostrophic SSH profile as a function of y:' WRITE(numout,'(12(1x,f6.2))') zssh(1,:) ENDIF ! DO jj = 1, nlcj DO ji = 1, nlci sshb(ji,jj) = zssh( mig(ji) , mjg(jj) ) * tmask(ji,jj,1) END DO END DO sshb(nlci+1:jpi, : ) = 0.e0 ! set to zero extra mpp columns sshb( : ,nlcj+1:jpj) = 0.e0 ! set to zero extra mpp rows ! sshn(:,:) = sshb(:,:) ! set now ssh to the before value ! IF( nn_rstssh /= 0 ) THEN nn_rstssh = 0 ! hand-made initilization of ssh CALL ctl_warn( 'istate_eel: force nn_rstssh = 0' ) ENDIF ! CALL div_cur( nit000 ) ! horizontal divergence and relative vorticity (curl) ! N.B. the vertical velocity will be computed from the horizontal divergence field ! in istate by a call to wzv routine ! ! ========================== CASE ( 2 , 6 ) ! EEL R2 or R6 configuration ! ! ========================== ! ! set temperature field with a NetCDF file ! ---------------------------------------- IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'istate_eel : EEL R2 or R6: read initial temperature in a NetCDF file' IF(lwp) WRITE(numout,*) '~~~~~~~~~~' ! CALL iom_open ( 'eel.initemp', inum ) CALL iom_get ( inum, jpdom_data, 'initemp', tsb(:,:,:,jp_tem) ) ! read before temprature (tb) CALL iom_close( inum ) ! tsn(:,:,:,jp_tem) = tsb(:,:,:,jp_tem) ! set nox temperature to tb ! IF(lwp) CALL prizre( tsn(:,:,:,jp_tem), jpi , jpj , jpk , jpj/2 , & & 1 , jpi , 5 , 1 , jpk , & & 1 , 1. , numout ) ! ! set salinity field to a constant value ! -------------------------------------- IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal IF(lwp) WRITE(numout,*) '~~~~~~~~~~' ! tsn(:,:,:,jp_sal) = zsal * tmask(:,:,:) tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal) ! ! ! =========================== CASE DEFAULT ! NONE existing configuration ! ! =========================== WRITE(ctmp1,*) 'EEL with a ', jp_cfg,' km resolution is not coded' CALL ctl_stop( ctmp1 ) ! END SELECT ! END SUBROUTINE istate_eel SUBROUTINE istate_gyre !!---------------------------------------------------------------------- !! *** ROUTINE istate_gyre *** !! !! ** Purpose : Initialization of the dynamics and tracers for GYRE !! configuration (double gyre with rotated domain) !! !! ** Method : - set temprature field !! - set salinity field !!---------------------------------------------------------------------- INTEGER :: ji, jj, jk ! dummy loop indices INTEGER :: inum ! temporary logical unit INTEGER, PARAMETER :: ntsinit = 0 ! (0/1) (analytical/input data files) T&S initialization !!---------------------------------------------------------------------- ! SELECT CASE ( ntsinit) ! CASE ( 0 ) ! analytical T/S profil deduced from LEVITUS IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'istate_gyre : initial analytical T and S profil deduced from LEVITUS ' IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' ! DO jk = 1, jpk DO jj = 1, jpj DO ji = 1, jpi tsn(ji,jj,jk,jp_tem) = ( 16. - 12. * TANH( (fsdept(ji,jj,jk) - 400) / 700 ) ) & & * (-TANH( (500-fsdept(ji,jj,jk)) / 150 ) + 1) / 2 & & + ( 15. * ( 1. - TANH( (fsdept(ji,jj,jk)-50.) / 1500.) ) & & - 1.4 * TANH((fsdept(ji,jj,jk)-100.) / 100.) & & + 7. * (1500. - fsdept(ji,jj,jk)) / 1500. ) & & * (-TANH( (fsdept(ji,jj,jk) - 500) / 150) + 1) / 2 tsn(ji,jj,jk,jp_tem) = tsn(ji,jj,jk,jp_tem) * tmask(ji,jj,jk) tsb(ji,jj,jk,jp_tem) = tsn(ji,jj,jk,jp_tem) tsn(ji,jj,jk,jp_sal) = ( 36.25 - 1.13 * TANH( (fsdept(ji,jj,jk) - 305) / 460 ) ) & & * (-TANH((500 - fsdept(ji,jj,jk)) / 150) + 1) / 2 & & + ( 35.55 + 1.25 * (5000. - fsdept(ji,jj,jk)) / 5000. & & - 1.62 * TANH( (fsdept(ji,jj,jk) - 60. ) / 650. ) & & + 0.2 * TANH( (fsdept(ji,jj,jk) - 35. ) / 100. ) & & + 0.2 * TANH( (fsdept(ji,jj,jk) - 1000.) / 5000.) ) & & * (-TANH((fsdept(ji,jj,jk) - 500) / 150) + 1) / 2 tsn(ji,jj,jk,jp_sal) = tsn(ji,jj,jk,jp_sal) * tmask(ji,jj,jk) tsb(ji,jj,jk,jp_sal) = tsn(ji,jj,jk,jp_sal) END DO END DO END DO ! CASE ( 1 ) ! T/S data fields read in dta_tem.nc/data_sal.nc files IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'istate_gyre : initial T and S read from dta_tem.nc/data_sal.nc files' IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' IF(lwp) WRITE(numout,*) ' NetCDF FORMAT' ! Read temperature field ! ---------------------- CALL iom_open ( 'data_tem', inum ) CALL iom_get ( inum, jpdom_data, 'votemper', tsn(:,:,:,jp_tem) ) CALL iom_close( inum ) tsn(:,:,:,jp_tem) = tsn(:,:,:,jp_tem) * tmask(:,:,:) tsb(:,:,:,jp_tem) = tsn(:,:,:,jp_tem) ! Read salinity field ! ------------------- CALL iom_open ( 'data_sal', inum ) CALL iom_get ( inum, jpdom_data, 'vosaline', tsn(:,:,:,jp_sal) ) CALL iom_close( inum ) tsn(:,:,:,jp_sal) = tsn(:,:,:,jp_sal) * tmask(:,:,:) tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal) ! END SELECT ! IF(lwp) THEN WRITE(numout,*) WRITE(numout,*) ' Initial temperature and salinity profiles:' WRITE(numout, "(9x,' level gdept_1d temperature salinity ')" ) WRITE(numout, "(10x, i4, 3f10.2)" ) ( jk, gdept_1d(jk), tsn(2,2,jk,jp_tem), tsn(2,2,jk,jp_sal), jk = 1, jpk ) ENDIF ! END SUBROUTINE istate_gyre SUBROUTINE istate_uvg !!---------------------------------------------------------------------- !! *** ROUTINE istate_uvg *** !! !! ** Purpose : Compute the geostrophic velocities from (tn,sn) fields !! !! ** Method : Using the hydrostatic hypothesis the now hydrostatic !! pressure is computed by integrating the in-situ density from the !! surface to the bottom. !! p=integral [ rau*g dz ] !!---------------------------------------------------------------------- USE dynspg ! surface pressure gradient (dyn_spg routine) USE divcur ! hor. divergence & rel. vorticity (div_cur routine) USE lbclnk ! ocean lateral boundary condition (or mpp link) ! INTEGER :: ji, jj, jk ! dummy loop indices INTEGER :: indic ! ??? REAL(wp) :: zmsv, zphv, zmsu, zphu, zalfg ! temporary scalars REAL(wp), POINTER, DIMENSION(:,:,:) :: zprn !!---------------------------------------------------------------------- ! CALL wrk_alloc( jpi, jpj, jpk, zprn) ! IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'istate_uvg : Start from Geostrophy' IF(lwp) WRITE(numout,*) '~~~~~~~~~~' ! Compute the now hydrostatic pressure ! ------------------------------------ zalfg = 0.5 * grav * rau0 zprn(:,:,1) = zalfg * fse3w(:,:,1) * ( 1 + rhd(:,:,1) ) ! Surface value DO jk = 2, jpkm1 ! Vertical integration from the surface zprn(:,:,jk) = zprn(:,:,jk-1) & & + zalfg * fse3w(:,:,jk) * ( 2. + rhd(:,:,jk) + rhd(:,:,jk-1) ) END DO ! Compute geostrophic balance ! --------------------------- DO jk = 1, jpkm1 DO jj = 2, jpjm1 DO ji = fs_2, fs_jpim1 ! vertor opt. zmsv = 1. / MAX( umask(ji-1,jj+1,jk) + umask(ji ,jj+1,jk) & + umask(ji-1,jj ,jk) + umask(ji ,jj ,jk) , 1. ) zphv = ( zprn(ji ,jj+1,jk) - zprn(ji-1,jj+1,jk) ) * umask(ji-1,jj+1,jk) / e1u(ji-1,jj+1) & + ( zprn(ji+1,jj+1,jk) - zprn(ji ,jj+1,jk) ) * umask(ji ,jj+1,jk) / e1u(ji ,jj+1) & + ( zprn(ji ,jj ,jk) - zprn(ji-1,jj ,jk) ) * umask(ji-1,jj ,jk) / e1u(ji-1,jj ) & + ( zprn(ji+1,jj ,jk) - zprn(ji ,jj ,jk) ) * umask(ji ,jj ,jk) / e1u(ji ,jj ) zphv = 1. / rau0 * zphv * zmsv * vmask(ji,jj,jk) zmsu = 1. / MAX( vmask(ji+1,jj ,jk) + vmask(ji ,jj ,jk) & + vmask(ji+1,jj-1,jk) + vmask(ji ,jj-1,jk) , 1. ) zphu = ( zprn(ji+1,jj+1,jk) - zprn(ji+1,jj ,jk) ) * vmask(ji+1,jj ,jk) / e2v(ji+1,jj ) & + ( zprn(ji ,jj+1,jk) - zprn(ji ,jj ,jk) ) * vmask(ji ,jj ,jk) / e2v(ji ,jj ) & + ( zprn(ji+1,jj ,jk) - zprn(ji+1,jj-1,jk) ) * vmask(ji+1,jj-1,jk) / e2v(ji+1,jj-1) & + ( zprn(ji ,jj ,jk) - zprn(ji ,jj-1,jk) ) * vmask(ji ,jj-1,jk) / e2v(ji ,jj-1) zphu = 1. / rau0 * zphu * zmsu * umask(ji,jj,jk) ! Compute the geostrophic velocities un(ji,jj,jk) = -2. * zphu / ( ff(ji,jj) + ff(ji ,jj-1) ) vn(ji,jj,jk) = 2. * zphv / ( ff(ji,jj) + ff(ji-1,jj ) ) END DO END DO END DO IF(lwp) WRITE(numout,*) ' we force to zero bottom velocity' ! Susbtract the bottom velocity (level jpk-1 for flat bottom case) ! to have a zero bottom velocity DO jk = 1, jpkm1 un(:,:,jk) = ( un(:,:,jk) - un(:,:,jpkm1) ) * umask(:,:,jk) vn(:,:,jk) = ( vn(:,:,jk) - vn(:,:,jpkm1) ) * vmask(:,:,jk) END DO CALL lbc_lnk( un, 'U', -1. ) CALL lbc_lnk( vn, 'V', -1. ) ub(:,:,:) = un(:,:,:) vb(:,:,:) = vn(:,:,:) ! WARNING !!!!! ! after initializing u and v, we need to calculate the initial streamfunction bsf. ! Otherwise, only the trend will be computed and the model will blow up (inconsistency). ! to do that, we call dyn_spg with a special trick: ! we fill ua and va with the velocities divided by dt, and the streamfunction will be brought to the ! right value assuming the velocities have been set up in one time step. ! we then set bsfd to zero (first guess for next step is d(psi)/dt = 0.) ! sets up s false trend to calculate the barotropic streamfunction. ua(:,:,:) = ub(:,:,:) / rdt va(:,:,:) = vb(:,:,:) / rdt ! calls dyn_spg. we assume euler time step, starting from rest. indic = 0 CALL dyn_spg( nit000, indic ) ! surface pressure gradient ! the new velocity is ua*rdt CALL lbc_lnk( ua, 'U', -1. ) CALL lbc_lnk( va, 'V', -1. ) ub(:,:,:) = ua(:,:,:) * rdt vb(:,:,:) = va(:,:,:) * rdt ua(:,:,:) = 0.e0 va(:,:,:) = 0.e0 un(:,:,:) = ub(:,:,:) vn(:,:,:) = vb(:,:,:) ! Compute the divergence and curl CALL div_cur( nit000 ) ! now horizontal divergence and curl hdivb(:,:,:) = hdivn(:,:,:) ! set the before to the now value rotb (:,:,:) = rotn (:,:,:) ! set the before to the now value ! CALL wrk_dealloc( jpi, jpj, jpk, zprn) ! END SUBROUTINE istate_uvg !!===================================================================== END MODULE istate