[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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[6140] | 8 | !! 3.7 ! 2015-11 (G. Madec) non linear free surface by default: e3t_m always computed |
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[888] | 9 | !!---------------------------------------------------------------------- |
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| 10 | |
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| 11 | !!---------------------------------------------------------------------- |
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[6140] | 12 | !! sbc_ssm : calculate sea surface mean currents, temperature, |
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| 13 | !! and salinity over nn_fsbc time-step |
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[888] | 14 | !!---------------------------------------------------------------------- |
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[6140] | 15 | USE oce ! ocean dynamics and tracers |
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| 16 | USE dom_oce ! ocean space and time domain |
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| 17 | USE sbc_oce ! surface boundary condition: ocean fields |
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| 18 | USE sbcapr ! surface boundary condition: atmospheric pressure |
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| 19 | USE eosbn2 ! equation of state and related derivatives |
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[4990] | 20 | ! |
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[6140] | 21 | USE in_out_manager ! I/O manager |
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| 22 | USE prtctl ! Print control |
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| 23 | USE iom ! IOM library |
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[888] | 24 | |
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| 25 | IMPLICIT NONE |
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| 26 | PRIVATE |
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| 27 | |
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[6140] | 28 | PUBLIC sbc_ssm ! routine called by step.F90 |
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| 29 | PUBLIC sbc_ssm_init ! routine called by sbcmod.F90 |
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[4292] | 30 | |
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[6140] | 31 | LOGICAL, SAVE :: l_ssm_mean = .FALSE. ! keep track of whether means have been read from restart file |
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[4292] | 32 | |
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[888] | 33 | !!---------------------------------------------------------------------- |
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[2528] | 34 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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[1156] | 35 | !! $Id$ |
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[2715] | 36 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[888] | 37 | !!---------------------------------------------------------------------- |
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| 38 | CONTAINS |
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| 39 | |
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| 40 | SUBROUTINE sbc_ssm( kt ) |
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| 41 | !!--------------------------------------------------------------------- |
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| 42 | !! *** ROUTINE sbc_oce *** |
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| 43 | !! |
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| 44 | !! ** Purpose : provide ocean surface variable to sea-surface boundary |
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| 45 | !! condition computation |
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| 46 | !! |
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| 47 | !! ** Method : compute mean surface velocity (2 components at U and |
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[7646] | 48 | !! V-points) [m/s], temperature [Celsius] and salinity [psu] over |
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[888] | 49 | !! the periode (kt - nn_fsbc) to kt |
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[2528] | 50 | !! Note that the inverse barometer ssh (i.e. ssh associated with Patm) |
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| 51 | !! is add to ssh_m when ln_apr_dyn = T. Required for sea-ice dynamics. |
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[888] | 52 | !!--------------------------------------------------------------------- |
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[2715] | 53 | INTEGER, INTENT(in) :: kt ! ocean time step |
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[888] | 54 | ! |
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[4990] | 55 | INTEGER :: ji, jj ! loop index |
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[2715] | 56 | REAL(wp) :: zcoef, zf_sbc ! local scalar |
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[4990] | 57 | REAL(wp), DIMENSION(jpi,jpj,jpts) :: zts |
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[888] | 58 | !!--------------------------------------------------------------------- |
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[6140] | 59 | ! |
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[5120] | 60 | ! !* surface T-, U-, V- ocean level variables (T, S, depth, velocity) |
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[4990] | 61 | DO jj = 1, jpj |
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| 62 | DO ji = 1, jpi |
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| 63 | zts(ji,jj,jp_tem) = tsn(ji,jj,mikt(ji,jj),jp_tem) |
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| 64 | zts(ji,jj,jp_sal) = tsn(ji,jj,mikt(ji,jj),jp_sal) |
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| 65 | END DO |
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| 66 | END DO |
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| 67 | ! |
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[3607] | 68 | IF( nn_fsbc == 1 ) THEN ! Instantaneous surface fields ! |
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[888] | 69 | ! ! ---------------------------------------- ! |
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[7753] | 70 | ssu_m(:,:) = ub(:,:,1) |
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| 71 | ssv_m(:,:) = vb(:,:,1) |
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| 72 | IF( l_useCT ) THEN ; sst_m(:,:) = eos_pt_from_ct( zts(:,:,jp_tem), zts(:,:,jp_sal) ) |
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| 73 | ELSE ; sst_m(:,:) = zts(:,:,jp_tem) |
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[4990] | 74 | ENDIF |
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[7753] | 75 | sss_m(:,:) = zts(:,:,jp_sal) |
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[2528] | 76 | ! ! removed inverse barometer ssh when Patm forcing is used (for sea-ice dynamics) |
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[7753] | 77 | IF( ln_apr_dyn ) THEN ; ssh_m(:,:) = sshn(:,:) - 0.5 * ( ssh_ib(:,:) + ssh_ibb(:,:) ) |
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| 78 | ELSE ; ssh_m(:,:) = sshn(:,:) |
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[2528] | 79 | ENDIF |
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[888] | 80 | ! |
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[7753] | 81 | e3t_m(:,:) = e3t_n(:,:,1) |
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[4292] | 82 | ! |
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[7753] | 83 | frq_m(:,:) = fraqsr_1lev(:,:) |
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[5407] | 84 | ! |
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[888] | 85 | ELSE |
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[3607] | 86 | ! ! ----------------------------------------------- ! |
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[3614] | 87 | IF( kt == nit000 .AND. .NOT. l_ssm_mean ) THEN ! Initialisation: 1st time-step, no input means ! |
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[3607] | 88 | ! ! ----------------------------------------------- ! |
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[888] | 89 | IF(lwp) WRITE(numout,*) |
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[7646] | 90 | IF(lwp) WRITE(numout,*) 'sbc_ssm : mean fields initialised to instantaneous values' |
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| 91 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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[3607] | 92 | zcoef = REAL( nn_fsbc - 1, wp ) |
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[7753] | 93 | ssu_m(:,:) = zcoef * ub(:,:,1) |
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| 94 | ssv_m(:,:) = zcoef * vb(:,:,1) |
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| 95 | IF( l_useCT ) THEN ; sst_m(:,:) = zcoef * eos_pt_from_ct( zts(:,:,jp_tem), zts(:,:,jp_sal) ) |
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| 96 | ELSE ; sst_m(:,:) = zcoef * zts(:,:,jp_tem) |
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[4990] | 97 | ENDIF |
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[7753] | 98 | sss_m(:,:) = zcoef * zts(:,:,jp_sal) |
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[4990] | 99 | ! ! removed inverse barometer ssh when Patm forcing is used (for sea-ice dynamics) |
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[7753] | 100 | IF( ln_apr_dyn ) THEN ; ssh_m(:,:) = zcoef * ( sshn(:,:) - 0.5 * ( ssh_ib(:,:) + ssh_ibb(:,:) ) ) |
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| 101 | ELSE ; ssh_m(:,:) = zcoef * sshn(:,:) |
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[888] | 102 | ENDIF |
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[4990] | 103 | ! |
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[7753] | 104 | e3t_m(:,:) = zcoef * e3t_n(:,:,1) |
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| 105 | ! |
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| 106 | frq_m(:,:) = zcoef * fraqsr_1lev(:,:) |
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[888] | 107 | ! ! ---------------------------------------- ! |
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| 108 | ELSEIF( MOD( kt - 2 , nn_fsbc ) == 0 ) THEN ! Initialisation: New mean computation ! |
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| 109 | ! ! ---------------------------------------- ! |
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[7753] | 110 | ssu_m(:,:) = 0._wp ! reset to zero ocean mean sbc fields |
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| 111 | ssv_m(:,:) = 0._wp |
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| 112 | sst_m(:,:) = 0._wp |
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| 113 | sss_m(:,:) = 0._wp |
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| 114 | ssh_m(:,:) = 0._wp |
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| 115 | e3t_m(:,:) = 0._wp |
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| 116 | frq_m(:,:) = 0._wp |
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[888] | 117 | ENDIF |
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| 118 | ! ! ---------------------------------------- ! |
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| 119 | ! ! Cumulate at each time step ! |
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| 120 | ! ! ---------------------------------------- ! |
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[7753] | 121 | ssu_m(:,:) = ssu_m(:,:) + ub(:,:,1) |
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| 122 | ssv_m(:,:) = ssv_m(:,:) + vb(:,:,1) |
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| 123 | IF( l_useCT ) THEN ; sst_m(:,:) = sst_m(:,:) + eos_pt_from_ct( zts(:,:,jp_tem), zts(:,:,jp_sal) ) |
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| 124 | ELSE ; sst_m(:,:) = sst_m(:,:) + zts(:,:,jp_tem) |
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[4990] | 125 | ENDIF |
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[7753] | 126 | sss_m(:,:) = sss_m(:,:) + zts(:,:,jp_sal) |
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[2528] | 127 | ! ! removed inverse barometer ssh when Patm forcing is used (for sea-ice dynamics) |
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[7753] | 128 | IF( ln_apr_dyn ) THEN ; ssh_m(:,:) = ssh_m(:,:) + sshn(:,:) - 0.5 * ( ssh_ib(:,:) + ssh_ibb(:,:) ) |
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| 129 | ELSE ; ssh_m(:,:) = ssh_m(:,:) + sshn(:,:) |
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[2528] | 130 | ENDIF |
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[4990] | 131 | ! |
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[7753] | 132 | e3t_m(:,:) = e3t_m(:,:) + e3t_n(:,:,1) |
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| 133 | ! |
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| 134 | frq_m(:,:) = frq_m(:,:) + fraqsr_1lev(:,:) |
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[888] | 135 | |
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| 136 | ! ! ---------------------------------------- ! |
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| 137 | IF( MOD( kt - 1 , nn_fsbc ) == 0 ) THEN ! Mean value at each nn_fsbc time-step ! |
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| 138 | ! ! ---------------------------------------- ! |
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| 139 | zcoef = 1. / REAL( nn_fsbc, wp ) |
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[7753] | 140 | sst_m(:,:) = sst_m(:,:) * zcoef ! mean SST [Celsius] |
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| 141 | sss_m(:,:) = sss_m(:,:) * zcoef ! mean SSS [psu] |
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| 142 | ssu_m(:,:) = ssu_m(:,:) * zcoef ! mean suface current [m/s] |
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| 143 | ssv_m(:,:) = ssv_m(:,:) * zcoef ! |
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| 144 | ssh_m(:,:) = ssh_m(:,:) * zcoef ! mean SSH [m] |
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| 145 | e3t_m(:,:) = e3t_m(:,:) * zcoef ! mean vertical scale factor [m] |
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| 146 | frq_m(:,:) = frq_m(:,:) * zcoef ! mean fraction of solar net radiation absorbed in the 1st T level [-] |
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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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[6140] | 163 | CALL iom_rstput( kt, nitrst, numrow, 'e3t_m' , e3t_m ) |
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[5407] | 164 | CALL iom_rstput( kt, nitrst, numrow, 'frq_m' , frq_m ) |
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[888] | 165 | ! |
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| 166 | ENDIF |
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| 167 | ! |
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| 168 | ENDIF |
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| 169 | ! |
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[5407] | 170 | IF( MOD( kt - 1 , nn_fsbc ) == 0 ) THEN ! Mean value at each nn_fsbc time-step ! |
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| 171 | CALL iom_put( 'ssu_m', ssu_m ) |
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| 172 | CALL iom_put( 'ssv_m', ssv_m ) |
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| 173 | CALL iom_put( 'sst_m', sst_m ) |
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| 174 | CALL iom_put( 'sss_m', sss_m ) |
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| 175 | CALL iom_put( 'ssh_m', ssh_m ) |
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[6140] | 176 | CALL iom_put( 'e3t_m', e3t_m ) |
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[5407] | 177 | CALL iom_put( 'frq_m', frq_m ) |
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| 178 | ENDIF |
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| 179 | ! |
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[888] | 180 | END SUBROUTINE sbc_ssm |
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| 181 | |
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[6140] | 182 | |
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[3607] | 183 | SUBROUTINE sbc_ssm_init |
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| 184 | !!---------------------------------------------------------------------- |
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| 185 | !! *** ROUTINE sbc_ssm_init *** |
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| 186 | !! |
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| 187 | !! ** Purpose : Initialisation of the sbc data |
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| 188 | !! |
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| 189 | !! ** Action : - read parameters |
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| 190 | !!---------------------------------------------------------------------- |
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[6140] | 191 | REAL(wp) :: zcoef, zf_sbc ! local scalar |
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[3607] | 192 | !!---------------------------------------------------------------------- |
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[6140] | 193 | ! |
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[3607] | 194 | IF( nn_fsbc == 1 ) THEN |
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| 195 | ! |
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| 196 | IF(lwp) WRITE(numout,*) |
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[7646] | 197 | IF(lwp) WRITE(numout,*) 'sbc_ssm_init : sea surface mean fields, nn_fsbc=1 : instantaneous values' |
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| 198 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~ ' |
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[3607] | 199 | ! |
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| 200 | ELSE |
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| 201 | ! |
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| 202 | IF(lwp) WRITE(numout,*) |
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[7646] | 203 | IF(lwp) WRITE(numout,*) 'sbc_ssm_init : sea surface mean fields' |
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| 204 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~ ' |
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[3607] | 205 | ! |
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| 206 | IF( ln_rstart .AND. iom_varid( numror, 'nn_fsbc', ldstop = .FALSE. ) > 0 ) THEN |
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| 207 | l_ssm_mean = .TRUE. |
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[6140] | 208 | CALL iom_get( numror , 'nn_fsbc', zf_sbc ) ! sbc frequency of previous run |
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| 209 | CALL iom_get( numror, jpdom_autoglo, 'ssu_m' , ssu_m ) ! sea surface mean velocity (U-point) |
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| 210 | CALL iom_get( numror, jpdom_autoglo, 'ssv_m' , ssv_m ) ! " " velocity (V-point) |
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| 211 | CALL iom_get( numror, jpdom_autoglo, 'sst_m' , sst_m ) ! " " temperature (T-point) |
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| 212 | CALL iom_get( numror, jpdom_autoglo, 'sss_m' , sss_m ) ! " " salinity (T-point) |
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| 213 | CALL iom_get( numror, jpdom_autoglo, 'ssh_m' , ssh_m ) ! " " height (T-point) |
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| 214 | CALL iom_get( numror, jpdom_autoglo, 'e3t_m' , e3t_m ) ! 1st level thickness (T-point) |
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[5407] | 215 | ! fraction of solar net radiation absorbed in 1st T level |
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| 216 | IF( iom_varid( numror, 'frq_m', ldstop = .FALSE. ) > 0 ) THEN |
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| 217 | CALL iom_get( numror, jpdom_autoglo, 'frq_m' , frq_m ) |
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| 218 | ELSE |
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[7753] | 219 | frq_m(:,:) = 1._wp ! default definition |
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[5407] | 220 | ENDIF |
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[3607] | 221 | ! |
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| 222 | IF( zf_sbc /= REAL( nn_fsbc, wp ) ) THEN ! nn_fsbc has changed between 2 runs |
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[7646] | 223 | IF(lwp) WRITE(numout,*) ' restart with a change in the frequency of mean from ', zf_sbc, ' to ', nn_fsbc |
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[3607] | 224 | zcoef = REAL( nn_fsbc - 1, wp ) / zf_sbc |
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[7753] | 225 | ssu_m(:,:) = zcoef * ssu_m(:,:) |
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| 226 | ssv_m(:,:) = zcoef * ssv_m(:,:) |
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| 227 | sst_m(:,:) = zcoef * sst_m(:,:) |
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| 228 | sss_m(:,:) = zcoef * sss_m(:,:) |
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| 229 | ssh_m(:,:) = zcoef * ssh_m(:,:) |
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| 230 | e3t_m(:,:) = zcoef * e3t_m(:,:) |
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| 231 | frq_m(:,:) = zcoef * frq_m(:,:) |
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[3607] | 232 | ELSE |
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[7646] | 233 | IF(lwp) WRITE(numout,*) ' mean fields read in the ocean restart file' |
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[3607] | 234 | ENDIF |
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| 235 | ENDIF |
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| 236 | ENDIF |
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| 237 | ! |
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[5407] | 238 | IF( .NOT. l_ssm_mean ) THEN ! default initialisation. needed by lim_istate |
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| 239 | ! |
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[7646] | 240 | IF(lwp) WRITE(numout,*) ' default initialisation of ss._m arrays' |
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[7753] | 241 | ssu_m(:,:) = ub(:,:,1) |
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| 242 | ssv_m(:,:) = vb(:,:,1) |
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[6489] | 243 | IF( l_useCT ) THEN ; sst_m(:,:) = eos_pt_from_ct( tsn(:,:,1,jp_tem), tsn(:,:,1,jp_sal) ) |
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[7646] | 244 | ELSE ; sst_m(:,:) = tsn(:,:,1,jp_tem) |
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[5407] | 245 | ENDIF |
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[7753] | 246 | sss_m(:,:) = tsn (:,:,1,jp_sal) |
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| 247 | ssh_m(:,:) = sshn (:,:) |
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| 248 | e3t_m(:,:) = e3t_n(:,:,1) |
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| 249 | frq_m(:,:) = 1._wp |
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[5407] | 250 | ! |
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| 251 | ENDIF |
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| 252 | ! |
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[3607] | 253 | END SUBROUTINE sbc_ssm_init |
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| 254 | |
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[888] | 255 | !!====================================================================== |
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| 256 | END MODULE sbcssm |
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