[888] | 1 | MODULE sbcssm |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE sbcssm *** |
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| 4 | !! Surface module : provide time-mean ocean surface variables |
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| 5 | !!====================================================================== |
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[2715] | 6 | !! History : 9.0 ! 2006-07 (G. Madec) Original code |
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[2528] | 7 | !! 3.3 ! 2010-10 (C. Bricaud, G. Madec) add the Patm forcing for sea-ice |
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[888] | 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! sbc_ssm : calculate sea surface mean currents, temperature, |
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| 12 | !! and salinity over nn_fsbc time-step |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | USE oce ! ocean dynamics and tracers |
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| 15 | USE dom_oce ! ocean space and time domain |
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[2528] | 16 | USE sbc_oce ! surface boundary condition: ocean fields |
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| 17 | USE sbcapr ! surface boundary condition: atmospheric pressure |
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[888] | 18 | USE prtctl ! Print control (prt_ctl routine) |
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| 19 | USE restart ! ocean restart |
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| 20 | USE iom |
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| 21 | USE in_out_manager ! I/O manager |
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| 22 | |
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| 23 | IMPLICIT NONE |
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| 24 | PRIVATE |
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| 25 | |
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| 26 | PUBLIC sbc_ssm ! routine called by step.F90 |
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[3211] | 27 | |
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| 28 | !! * Control permutation of array indices |
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| 29 | # include "oce_ftrans.h90" |
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| 30 | # include "dom_oce_ftrans.h90" |
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| 31 | # include "sbc_oce_ftrans.h90" |
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[888] | 32 | |
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| 33 | !! * Substitutions |
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| 34 | # include "domzgr_substitute.h90" |
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| 35 | !!---------------------------------------------------------------------- |
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[2528] | 36 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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[1156] | 37 | !! $Id$ |
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[2715] | 38 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[888] | 39 | !!---------------------------------------------------------------------- |
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| 40 | CONTAINS |
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| 41 | |
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| 42 | SUBROUTINE sbc_ssm( kt ) |
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| 43 | !!--------------------------------------------------------------------- |
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| 44 | !! *** ROUTINE sbc_oce *** |
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| 45 | !! |
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| 46 | !! ** Purpose : provide ocean surface variable to sea-surface boundary |
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| 47 | !! condition computation |
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| 48 | !! |
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| 49 | !! ** Method : compute mean surface velocity (2 components at U and |
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| 50 | !! V-points) [m/s], temperature [Celcius] and salinity [psu] over |
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| 51 | !! the periode (kt - nn_fsbc) to kt |
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[2528] | 52 | !! Note that the inverse barometer ssh (i.e. ssh associated with Patm) |
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| 53 | !! is add to ssh_m when ln_apr_dyn = T. Required for sea-ice dynamics. |
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[888] | 54 | !!--------------------------------------------------------------------- |
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[2715] | 55 | INTEGER, INTENT(in) :: kt ! ocean time step |
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[888] | 56 | ! |
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[2715] | 57 | REAL(wp) :: zcoef, zf_sbc ! local scalar |
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[888] | 58 | !!--------------------------------------------------------------------- |
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| 59 | ! ! ---------------------------------------- ! |
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| 60 | IF( nn_fsbc == 1 ) THEN ! Instantaneous surface fields ! |
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| 61 | ! ! ---------------------------------------- ! |
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| 62 | IF( kt == nit000 ) THEN |
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| 63 | IF(lwp) WRITE(numout,*) |
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| 64 | IF(lwp) WRITE(numout,*) 'sbc_ssm : sea surface mean fields, nn_fsbc=1 : instantaneous values' |
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| 65 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 66 | ENDIF |
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| 67 | ! |
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[1267] | 68 | ssu_m(:,:) = ub(:,:,1) |
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| 69 | ssv_m(:,:) = vb(:,:,1) |
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[888] | 70 | sst_m(:,:) = tn(:,:,1) |
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| 71 | sss_m(:,:) = sn(:,:,1) |
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[2528] | 72 | ! ! removed inverse barometer ssh when Patm forcing is used (for sea-ice dynamics) |
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| 73 | IF( ln_apr_dyn ) THEN ; ssh_m(:,:) = sshn(:,:) - 0.5 * ( ssh_ib(:,:) + ssh_ibb(:,:) ) |
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| 74 | ELSE ; ssh_m(:,:) = sshn(:,:) |
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| 75 | ENDIF |
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| 76 | |
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[888] | 77 | ! |
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| 78 | ELSE |
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| 79 | ! ! ---------------------------------------- ! |
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| 80 | IF( kt == nit000) THEN ! Initialisation: 1st time-step ! |
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| 81 | ! ! ---------------------------------------- ! |
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| 82 | IF(lwp) WRITE(numout,*) |
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| 83 | IF(lwp) WRITE(numout,*) 'sbc_ssm : sea surface mean fields' |
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| 84 | ! |
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[1214] | 85 | IF( ln_rstart .AND. iom_varid( numror, 'nn_fsbc', ldstop = .FALSE. ) > 0 ) THEN |
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[1196] | 86 | CALL iom_get( numror , 'nn_fsbc', zf_sbc ) ! sbc frequency of previous run |
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| 87 | CALL iom_get( numror, jpdom_autoglo, 'ssu_m' , ssu_m ) ! sea surface mean velocity (T-point) |
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| 88 | CALL iom_get( numror, jpdom_autoglo, 'ssv_m' , ssv_m ) ! " " velocity (V-point) |
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| 89 | CALL iom_get( numror, jpdom_autoglo, 'sst_m' , sst_m ) ! " " temperature (T-point) |
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| 90 | CALL iom_get( numror, jpdom_autoglo, 'sss_m' , sss_m ) ! " " salinity (T-point) |
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[1244] | 91 | CALL iom_get( numror, jpdom_autoglo, 'ssh_m' , ssh_m ) ! " " height (T-point) |
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[888] | 92 | ! |
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| 93 | IF( zf_sbc /= REAL( nn_fsbc, wp ) ) THEN ! nn_fsbc has changed between 2 runs |
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| 94 | IF(lwp) WRITE(numout,*) '~~~~~~~ restart with a change in the frequency of mean ', & |
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| 95 | & 'from ', zf_sbc, ' to ', nn_fsbc |
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| 96 | zcoef = REAL( nn_fsbc - 1, wp ) / zf_sbc |
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| 97 | ssu_m(:,:) = zcoef * ssu_m(:,:) |
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| 98 | ssv_m(:,:) = zcoef * ssv_m(:,:) |
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| 99 | sst_m(:,:) = zcoef * sst_m(:,:) |
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| 100 | sss_m(:,:) = zcoef * sss_m(:,:) |
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[1244] | 101 | ssh_m(:,:) = zcoef * ssh_m(:,:) |
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[888] | 102 | ELSE |
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| 103 | IF(lwp) WRITE(numout,*) '~~~~~~~ mean fields read in the ocean restart file' |
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| 104 | ENDIF |
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| 105 | ELSE |
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| 106 | IF(lwp) WRITE(numout,*) '~~~~~~~ mean fields initialised to instantaneous values' |
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| 107 | zcoef = REAL( nn_fsbc - 1, wp ) |
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[1267] | 108 | ssu_m(:,:) = zcoef * ub(:,:,1) |
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| 109 | ssv_m(:,:) = zcoef * vb(:,:,1) |
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[888] | 110 | sst_m(:,:) = zcoef * tn(:,:,1) |
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| 111 | sss_m(:,:) = zcoef * sn(:,:,1) |
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[2528] | 112 | ! ! removed inverse barometer ssh when Patm forcing is used |
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| 113 | IF( ln_apr_dyn ) THEN ; ssh_m(:,:) = zcoef * ( sshn(:,:) - 0.5 * ( ssh_ib(:,:) + ssh_ibb(:,:) ) ) |
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| 114 | ELSE ; ssh_m(:,:) = zcoef * sshn(:,:) |
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| 115 | ENDIF |
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| 116 | |
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[888] | 117 | ENDIF |
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| 118 | ! ! ---------------------------------------- ! |
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| 119 | ELSEIF( MOD( kt - 2 , nn_fsbc ) == 0 ) THEN ! Initialisation: New mean computation ! |
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| 120 | ! ! ---------------------------------------- ! |
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| 121 | ssu_m(:,:) = 0.e0 ! reset to zero ocean mean sbc fields |
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| 122 | ssv_m(:,:) = 0.e0 |
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| 123 | sst_m(:,:) = 0.e0 |
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| 124 | sss_m(:,:) = 0.e0 |
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[1244] | 125 | ssh_m(:,:) = 0.e0 |
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[888] | 126 | ENDIF |
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| 127 | ! ! ---------------------------------------- ! |
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| 128 | ! ! Cumulate at each time step ! |
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| 129 | ! ! ---------------------------------------- ! |
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[1267] | 130 | ssu_m(:,:) = ssu_m(:,:) + ub(:,:,1) |
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| 131 | ssv_m(:,:) = ssv_m(:,:) + vb(:,:,1) |
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[888] | 132 | sst_m(:,:) = sst_m(:,:) + tn(:,:,1) |
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| 133 | sss_m(:,:) = sss_m(:,:) + sn(:,:,1) |
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[2528] | 134 | ! ! removed inverse barometer ssh when Patm forcing is used (for sea-ice dynamics) |
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| 135 | IF( ln_apr_dyn ) THEN ; ssh_m(:,:) = ssh_m(:,:) + sshn(:,:) - 0.5 * ( ssh_ib(:,:) + ssh_ibb(:,:) ) |
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| 136 | ELSE ; ssh_m(:,:) = ssh_m(:,:) + sshn(:,:) |
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| 137 | ENDIF |
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[888] | 138 | |
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| 139 | ! ! ---------------------------------------- ! |
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| 140 | IF( MOD( kt - 1 , nn_fsbc ) == 0 ) THEN ! Mean value at each nn_fsbc time-step ! |
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| 141 | ! ! ---------------------------------------- ! |
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| 142 | zcoef = 1. / REAL( nn_fsbc, wp ) |
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| 143 | sst_m(:,:) = sst_m(:,:) * zcoef ! mean SST [Celcius] |
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| 144 | sss_m(:,:) = sss_m(:,:) * zcoef ! mean SSS [psu] |
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| 145 | ssu_m(:,:) = ssu_m(:,:) * zcoef ! mean suface current [m/s] |
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| 146 | ssv_m(:,:) = ssv_m(:,:) * zcoef ! |
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[1244] | 147 | ssh_m(:,:) = ssh_m(:,:) * zcoef ! mean SSH [m] |
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[888] | 148 | ! |
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| 149 | ENDIF |
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| 150 | ! ! ---------------------------------------- ! |
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| 151 | IF( lrst_oce ) THEN ! Write in the ocean restart file ! |
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| 152 | ! ! ---------------------------------------- ! |
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| 153 | IF(lwp) WRITE(numout,*) |
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| 154 | IF(lwp) WRITE(numout,*) 'sbc_ssm : sea surface mean fields written in ocean restart file ', & |
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| 155 | & 'at it= ', kt,' date= ', ndastp |
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| 156 | IF(lwp) WRITE(numout,*) '~~~~~~~' |
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| 157 | zf_sbc = REAL( nn_fsbc, wp ) |
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| 158 | CALL iom_rstput( kt, nitrst, numrow, 'nn_fsbc', zf_sbc ) ! sbc frequency |
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| 159 | CALL iom_rstput( kt, nitrst, numrow, 'ssu_m' , ssu_m ) ! sea surface mean fields |
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| 160 | CALL iom_rstput( kt, nitrst, numrow, 'ssv_m' , ssv_m ) |
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| 161 | CALL iom_rstput( kt, nitrst, numrow, 'sst_m' , sst_m ) |
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| 162 | CALL iom_rstput( kt, nitrst, numrow, 'sss_m' , sss_m ) |
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[1244] | 163 | CALL iom_rstput( kt, nitrst, numrow, 'ssh_m' , ssh_m ) |
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[888] | 164 | ! |
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| 165 | ENDIF |
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| 166 | ! |
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| 167 | ENDIF |
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| 168 | ! |
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| 169 | END SUBROUTINE sbc_ssm |
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| 170 | |
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| 171 | !!====================================================================== |
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| 172 | END MODULE sbcssm |
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