[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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[5208] | 18 | USE eosbn2 ! equation of state and related derivatives |
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| 19 | ! |
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[888] | 20 | USE in_out_manager ! I/O manager |
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[5208] | 21 | USE prtctl ! Print control |
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| 22 | USE iom ! IOM library |
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[888] | 23 | |
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| 24 | IMPLICIT NONE |
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| 25 | PRIVATE |
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| 26 | |
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[3614] | 27 | PUBLIC sbc_ssm ! routine called by step.F90 |
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| 28 | PUBLIC sbc_ssm_init ! routine called by sbcmod.F90 |
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[4292] | 29 | |
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[3607] | 30 | LOGICAL, SAVE :: l_ssm_mean = .FALSE. ! keep track of whether means have been read |
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| 31 | ! from restart file |
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[4292] | 32 | |
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[888] | 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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[5235] | 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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[5208] | 57 | INTEGER :: ji, jj ! loop index |
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[2715] | 58 | REAL(wp) :: zcoef, zf_sbc ! local scalar |
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[5208] | 59 | REAL(wp), DIMENSION(jpi,jpj,jpts) :: zts |
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| 60 | REAL(wp), DIMENSION(jpi,jpj) :: zub, zvb,zdep |
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[888] | 61 | !!--------------------------------------------------------------------- |
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[5208] | 62 | |
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[5313] | 63 | ! !* surface T-, U-, V- ocean level variables (T, S, depth, velocity) |
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[5208] | 64 | DO jj = 1, jpj |
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| 65 | DO ji = 1, jpi |
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| 66 | zts(ji,jj,jp_tem) = tsn(ji,jj,mikt(ji,jj),jp_tem) |
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| 67 | zts(ji,jj,jp_sal) = tsn(ji,jj,mikt(ji,jj),jp_sal) |
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| 68 | END DO |
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| 69 | END DO |
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[5313] | 70 | zub(:,:) = ub (:,:,1 ) |
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| 71 | zvb(:,:) = vb (:,:,1 ) |
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[5208] | 72 | ! |
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| 73 | IF( lk_vvl ) THEN |
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[5313] | 74 | zdep(:,:) = fse3t_n(:,:,1) |
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[5208] | 75 | ENDIF |
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[888] | 76 | ! ! ---------------------------------------- ! |
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[3607] | 77 | IF( nn_fsbc == 1 ) THEN ! Instantaneous surface fields ! |
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[888] | 78 | ! ! ---------------------------------------- ! |
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[5208] | 79 | ssu_m(:,:) = zub(:,:) |
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| 80 | ssv_m(:,:) = zvb(:,:) |
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| 81 | IF( ln_useCT ) THEN ; sst_m(:,:) = eos_pt_from_ct( zts(:,:,jp_tem), zts(:,:,jp_sal) ) |
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| 82 | ELSE ; sst_m(:,:) = zts(:,:,jp_tem) |
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| 83 | ENDIF |
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| 84 | sss_m(:,:) = zts(:,:,jp_sal) |
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[2528] | 85 | ! ! removed inverse barometer ssh when Patm forcing is used (for sea-ice dynamics) |
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| 86 | IF( ln_apr_dyn ) THEN ; ssh_m(:,:) = sshn(:,:) - 0.5 * ( ssh_ib(:,:) + ssh_ibb(:,:) ) |
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| 87 | ELSE ; ssh_m(:,:) = sshn(:,:) |
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| 88 | ENDIF |
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[888] | 89 | ! |
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[5208] | 90 | IF( lk_vvl ) fse3t_m(:,:) = zdep(:,:) |
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[4292] | 91 | ! |
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[888] | 92 | ELSE |
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[3607] | 93 | ! ! ----------------------------------------------- ! |
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[3614] | 94 | IF( kt == nit000 .AND. .NOT. l_ssm_mean ) THEN ! Initialisation: 1st time-step, no input means ! |
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[3607] | 95 | ! ! ----------------------------------------------- ! |
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[888] | 96 | IF(lwp) WRITE(numout,*) |
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[3607] | 97 | IF(lwp) WRITE(numout,*) '~~~~~~~ mean fields initialised to instantaneous values' |
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| 98 | zcoef = REAL( nn_fsbc - 1, wp ) |
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[5208] | 99 | ssu_m(:,:) = zcoef * zub(:,:) |
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| 100 | ssv_m(:,:) = zcoef * zvb(:,:) |
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| 101 | IF( ln_useCT ) THEN ; sst_m(:,:) = zcoef * eos_pt_from_ct( zts(:,:,jp_tem), zts(:,:,jp_sal) ) |
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| 102 | ELSE ; sst_m(:,:) = zcoef * zts(:,:,jp_tem) |
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| 103 | ENDIF |
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| 104 | sss_m(:,:) = zcoef * zts(:,:,jp_sal) |
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| 105 | ! ! removed inverse barometer ssh when Patm forcing is used (for sea-ice dynamics) |
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[3607] | 106 | IF( ln_apr_dyn ) THEN ; ssh_m(:,:) = zcoef * ( sshn(:,:) - 0.5 * ( ssh_ib(:,:) + ssh_ibb(:,:) ) ) |
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[5208] | 107 | ELSE ; ssh_m(:,:) = zcoef * sshn(:,:) |
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[888] | 108 | ENDIF |
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[5208] | 109 | ! |
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| 110 | IF( lk_vvl ) fse3t_m(:,:) = zcoef * zdep(:,:) |
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[888] | 111 | ! ! ---------------------------------------- ! |
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| 112 | ELSEIF( MOD( kt - 2 , nn_fsbc ) == 0 ) THEN ! Initialisation: New mean computation ! |
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| 113 | ! ! ---------------------------------------- ! |
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| 114 | ssu_m(:,:) = 0.e0 ! reset to zero ocean mean sbc fields |
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| 115 | ssv_m(:,:) = 0.e0 |
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| 116 | sst_m(:,:) = 0.e0 |
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| 117 | sss_m(:,:) = 0.e0 |
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[1244] | 118 | ssh_m(:,:) = 0.e0 |
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[4292] | 119 | IF( lk_vvl ) fse3t_m(:,:) = 0.e0 |
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[888] | 120 | ENDIF |
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| 121 | ! ! ---------------------------------------- ! |
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| 122 | ! ! Cumulate at each time step ! |
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| 123 | ! ! ---------------------------------------- ! |
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[5208] | 124 | ssu_m(:,:) = ssu_m(:,:) + zub(:,:) |
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| 125 | ssv_m(:,:) = ssv_m(:,:) + zvb(:,:) |
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| 126 | IF( ln_useCT ) THEN ; sst_m(:,:) = sst_m(:,:) + eos_pt_from_ct( zts(:,:,jp_tem), zts(:,:,jp_sal) ) |
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| 127 | ELSE ; sst_m(:,:) = sst_m(:,:) + zts(:,:,jp_tem) |
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| 128 | ENDIF |
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| 129 | sss_m(:,:) = sss_m(:,:) + zts(:,:,jp_sal) |
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[2528] | 130 | ! ! removed inverse barometer ssh when Patm forcing is used (for sea-ice dynamics) |
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[5208] | 131 | IF( ln_apr_dyn ) THEN ; ssh_m(:,:) = ssh_m(:,:) + sshn(:,:) - 0.5 * ( ssh_ib(:,:) + ssh_ibb(:,:) ) |
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[2528] | 132 | ELSE ; ssh_m(:,:) = ssh_m(:,:) + sshn(:,:) |
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| 133 | ENDIF |
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[5208] | 134 | ! |
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| 135 | IF( lk_vvl ) fse3t_m(:,:) = fse3t_m(:,:) + zdep(:,:) |
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[888] | 136 | |
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| 137 | ! ! ---------------------------------------- ! |
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| 138 | IF( MOD( kt - 1 , nn_fsbc ) == 0 ) THEN ! Mean value at each nn_fsbc time-step ! |
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| 139 | ! ! ---------------------------------------- ! |
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| 140 | zcoef = 1. / REAL( nn_fsbc, wp ) |
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| 141 | sst_m(:,:) = sst_m(:,:) * zcoef ! mean SST [Celcius] |
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| 142 | sss_m(:,:) = sss_m(:,:) * zcoef ! mean SSS [psu] |
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| 143 | ssu_m(:,:) = ssu_m(:,:) * zcoef ! mean suface current [m/s] |
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| 144 | ssv_m(:,:) = ssv_m(:,:) * zcoef ! |
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[1244] | 145 | ssh_m(:,:) = ssh_m(:,:) * zcoef ! mean SSH [m] |
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[4292] | 146 | IF( lk_vvl ) fse3t_m(:,:) = fse3t_m(:,:) * zcoef ! mean vertical scale factor [m] |
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[888] | 147 | ! |
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| 148 | ENDIF |
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| 149 | ! ! ---------------------------------------- ! |
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| 150 | IF( lrst_oce ) THEN ! Write in the ocean restart file ! |
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| 151 | ! ! ---------------------------------------- ! |
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| 152 | IF(lwp) WRITE(numout,*) |
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| 153 | IF(lwp) WRITE(numout,*) 'sbc_ssm : sea surface mean fields written in ocean restart file ', & |
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| 154 | & 'at it= ', kt,' date= ', ndastp |
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| 155 | IF(lwp) WRITE(numout,*) '~~~~~~~' |
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| 156 | zf_sbc = REAL( nn_fsbc, wp ) |
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| 157 | CALL iom_rstput( kt, nitrst, numrow, 'nn_fsbc', zf_sbc ) ! sbc frequency |
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| 158 | CALL iom_rstput( kt, nitrst, numrow, 'ssu_m' , ssu_m ) ! sea surface mean fields |
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| 159 | CALL iom_rstput( kt, nitrst, numrow, 'ssv_m' , ssv_m ) |
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| 160 | CALL iom_rstput( kt, nitrst, numrow, 'sst_m' , sst_m ) |
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| 161 | CALL iom_rstput( kt, nitrst, numrow, 'sss_m' , sss_m ) |
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[1244] | 162 | CALL iom_rstput( kt, nitrst, numrow, 'ssh_m' , ssh_m ) |
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[4292] | 163 | IF( lk_vvl ) THEN |
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| 164 | CALL iom_rstput( kt, nitrst, numrow, 'fse3t_m' , fse3t_m(:,:) ) |
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| 165 | END IF |
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[888] | 166 | ! |
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| 167 | ENDIF |
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| 168 | ! |
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| 169 | ENDIF |
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| 170 | ! |
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| 171 | END SUBROUTINE sbc_ssm |
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| 172 | |
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[3607] | 173 | SUBROUTINE sbc_ssm_init |
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| 174 | !!---------------------------------------------------------------------- |
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| 175 | !! *** ROUTINE sbc_ssm_init *** |
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| 176 | !! |
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| 177 | !! ** Purpose : Initialisation of the sbc data |
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| 178 | !! |
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| 179 | !! ** Action : - read parameters |
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| 180 | !!---------------------------------------------------------------------- |
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[3614] | 181 | REAL(wp) :: zcoef, zf_sbc ! local scalar |
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[3607] | 182 | !!---------------------------------------------------------------------- |
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| 183 | |
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| 184 | IF( nn_fsbc == 1 ) THEN |
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| 185 | ! |
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| 186 | IF(lwp) WRITE(numout,*) |
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| 187 | IF(lwp) WRITE(numout,*) 'sbc_ssm : sea surface mean fields, nn_fsbc=1 : instantaneous values' |
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| 188 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 189 | ! |
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| 190 | ELSE |
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| 191 | ! |
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| 192 | IF(lwp) WRITE(numout,*) |
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| 193 | IF(lwp) WRITE(numout,*) 'sbc_ssm : sea surface mean fields' |
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| 194 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 195 | ! |
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| 196 | IF( ln_rstart .AND. iom_varid( numror, 'nn_fsbc', ldstop = .FALSE. ) > 0 ) THEN |
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| 197 | l_ssm_mean = .TRUE. |
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| 198 | CALL iom_get( numror , 'nn_fsbc', zf_sbc ) ! sbc frequency of previous run |
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| 199 | CALL iom_get( numror, jpdom_autoglo, 'ssu_m' , ssu_m ) ! sea surface mean velocity (T-point) |
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| 200 | CALL iom_get( numror, jpdom_autoglo, 'ssv_m' , ssv_m ) ! " " velocity (V-point) |
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| 201 | CALL iom_get( numror, jpdom_autoglo, 'sst_m' , sst_m ) ! " " temperature (T-point) |
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| 202 | CALL iom_get( numror, jpdom_autoglo, 'sss_m' , sss_m ) ! " " salinity (T-point) |
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| 203 | CALL iom_get( numror, jpdom_autoglo, 'ssh_m' , ssh_m ) ! " " height (T-point) |
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[4292] | 204 | IF( lk_vvl ) CALL iom_get( numror, jpdom_autoglo, 'fse3t_m', fse3t_m(:,:) ) |
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[3607] | 205 | ! |
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| 206 | IF( zf_sbc /= REAL( nn_fsbc, wp ) ) THEN ! nn_fsbc has changed between 2 runs |
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| 207 | IF(lwp) WRITE(numout,*) '~~~~~~~ restart with a change in the frequency of mean ', & |
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| 208 | & 'from ', zf_sbc, ' to ', nn_fsbc |
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| 209 | zcoef = REAL( nn_fsbc - 1, wp ) / zf_sbc |
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| 210 | ssu_m(:,:) = zcoef * ssu_m(:,:) |
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| 211 | ssv_m(:,:) = zcoef * ssv_m(:,:) |
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| 212 | sst_m(:,:) = zcoef * sst_m(:,:) |
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| 213 | sss_m(:,:) = zcoef * sss_m(:,:) |
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| 214 | ssh_m(:,:) = zcoef * ssh_m(:,:) |
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[4292] | 215 | IF( lk_vvl ) fse3t_m(:,:) = zcoef * fse3t_m(:,:) |
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[3607] | 216 | ELSE |
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| 217 | IF(lwp) WRITE(numout,*) '~~~~~~~ mean fields read in the ocean restart file' |
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| 218 | ENDIF |
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| 219 | ENDIF |
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| 220 | ENDIF |
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| 221 | ! |
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| 222 | END SUBROUTINE sbc_ssm_init |
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| 223 | |
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[888] | 224 | !!====================================================================== |
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| 225 | END MODULE sbcssm |
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