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