1 | MODULE sbcflx |
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2 | !!====================================================================== |
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3 | !! *** MODULE sbcflx *** |
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4 | !! Ocean forcing: momentum, heat and freshwater flux formulation |
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5 | !!===================================================================== |
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6 | !! History : 1.0 ! 2006-06 (G. Madec) Original code |
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7 | !! 3.3 ! 2010-10 (S. Masson) add diurnal cycle |
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8 | !!---------------------------------------------------------------------- |
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9 | |
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10 | !!---------------------------------------------------------------------- |
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11 | !! namflx : flux formulation namlist |
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12 | !! sbc_flx : flux formulation as ocean surface boundary condition (forced mode, fluxes read in NetCDF files) |
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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 sbcdcy ! surface boundary condition: diurnal cycle on qsr |
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18 | USE phycst ! physical constants |
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19 | USE fldread ! read input fields |
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20 | USE iom ! IOM library |
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21 | USE in_out_manager ! I/O manager |
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22 | USE sbcwave ! wave physics |
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23 | USE lib_mpp ! distribued memory computing library |
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24 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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25 | USE wrk_nemo ! work arrays |
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26 | |
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27 | IMPLICIT NONE |
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28 | PRIVATE |
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29 | |
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30 | PUBLIC sbc_flx ! routine called by step.F90 |
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31 | |
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32 | INTEGER , PARAMETER :: jpfld = 6 ! maximum number of files to read |
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33 | INTEGER , PARAMETER :: jp_utau = 1 ! index of wind stress (i-component) file |
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34 | INTEGER , PARAMETER :: jp_vtau = 2 ! index of wind stress (j-component) file |
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35 | INTEGER , PARAMETER :: jp_qtot = 3 ! index of total (non solar+solar) heat file |
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36 | INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat file |
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37 | INTEGER , PARAMETER :: jp_emp = 5 ! index of evaporation-precipation file |
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38 | INTEGER , PARAMETER :: jp_press = 6 ! index of pressure for UKMO shelf fluxes |
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39 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read) |
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40 | LOGICAL , PUBLIC :: ln_shelf_flx = .FALSE. ! UKMO SHELF specific flux flag |
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41 | LOGICAL , PUBLIC :: ln_rel_wind = .FALSE. ! UKMO SHELF specific flux flag - relative winds |
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42 | REAL(wp) :: rn_wfac ! multiplication factor for ice/ocean velocity in the calculation of wind stress (clem) |
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43 | INTEGER :: jpfld_local ! maximum number of files to read (locally modified depending on ln_shelf_flx) |
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44 | |
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45 | !! * Substitutions |
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46 | # include "domzgr_substitute.h90" |
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47 | # include "vectopt_loop_substitute.h90" |
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48 | !!---------------------------------------------------------------------- |
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49 | !! NEMO/OPA 3.3 , NEMO-consortium (2010) |
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50 | !! $Id$ |
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51 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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52 | !!---------------------------------------------------------------------- |
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53 | CONTAINS |
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54 | |
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55 | SUBROUTINE sbc_flx( kt ) |
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56 | !!--------------------------------------------------------------------- |
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57 | !! *** ROUTINE sbc_flx *** |
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58 | !! |
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59 | !! ** Purpose : provide at each time step the surface ocean fluxes |
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60 | !! (momentum, heat, freshwater and runoff) |
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61 | !! |
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62 | !! ** Method : - READ each fluxes in NetCDF files: |
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63 | !! i-component of the stress utau (N/m2) |
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64 | !! j-component of the stress vtau (N/m2) |
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65 | !! net downward heat flux qtot (watt/m2) |
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66 | !! net downward radiative flux qsr (watt/m2) |
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67 | !! net upward freshwater (evapo - precip) emp (kg/m2/s) |
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68 | !! |
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69 | !! CAUTION : - never mask the surface stress fields |
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70 | !! - the stress is assumed to be in the (i,j) mesh referential |
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71 | !! |
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72 | !! ** Action : update at each time-step |
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73 | !! - utau, vtau i- and j-component of the wind stress |
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74 | !! - taum wind stress module at T-point |
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75 | !! - wndm 10m wind module at T-point |
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76 | !! - qns non solar heat flux including heat flux due to emp |
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77 | !! - qsr solar heat flux |
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78 | !! - emp upward mass flux (evap. - precip.) |
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79 | !! - sfx salt flux; set to zero at nit000 but possibly non-zero |
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80 | !! if ice is present (computed in limsbc(_2).F90) |
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81 | !!---------------------------------------------------------------------- |
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82 | INTEGER, INTENT(in) :: kt ! ocean time step |
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83 | !! |
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84 | INTEGER :: ji, jj, jf ! dummy indices |
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85 | INTEGER :: ierror ! return error code |
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86 | INTEGER :: ios ! Local integer output status for namelist read |
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87 | REAL(wp) :: zfact ! temporary scalar |
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88 | REAL(wp) :: zrhoa = 1.22 ! Air density kg/m3 |
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89 | REAL(wp) :: zcdrag = 1.5e-3 ! drag coefficient |
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90 | REAL(wp) :: totwind ! UKMO SHELF: Module of wind speed |
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91 | REAL(wp) :: ztx, zty, zmod, zcoef ! temporary variables |
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92 | REAL :: cs ! UKMO SHELF: Friction co-efficient at surface |
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93 | REAL :: totwindspd ! UKMO SHELF: Magnitude of wind speed vector |
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94 | REAL(wp), DIMENSION(:,:), POINTER :: zwnd_i, zwnd_j ! wind speed components at T-point |
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95 | |
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96 | REAL(wp) :: rhoa = 1.22 ! Air density kg/m3 |
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97 | REAL(wp) :: cdrag = 1.5e-3 ! drag coefficient |
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98 | !! |
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99 | CHARACTER(len=100) :: cn_dir ! Root directory for location of flx files |
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100 | TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist information structures |
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101 | TYPE(FLD_N) :: sn_utau, sn_vtau, sn_qtot, sn_qsr, sn_emp, sn_press ! informations about the fields to be read |
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102 | LOGICAL :: ln_foam_flx = .FALSE. ! UKMO FOAM specific flux flag |
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103 | NAMELIST/namsbc_flx/ cn_dir, sn_utau, sn_vtau, sn_qtot, sn_qsr, sn_emp, & |
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104 | & ln_foam_flx, sn_press, ln_shelf_flx, ln_rel_wind, & |
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105 | & rn_wfac |
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106 | !!--------------------------------------------------------------------- |
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107 | ! |
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108 | IF( kt == nit000 ) THEN ! First call kt=nit000 |
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109 | ! set file information |
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110 | REWIND( numnam_ref ) ! Namelist namsbc_flx in reference namelist : Files for fluxes |
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111 | READ ( numnam_ref, namsbc_flx, IOSTAT = ios, ERR = 901) |
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112 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_flx in reference namelist', lwp ) |
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113 | |
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114 | REWIND( numnam_cfg ) ! Namelist namsbc_flx in configuration namelist : Files for fluxes |
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115 | READ ( numnam_cfg, namsbc_flx, IOSTAT = ios, ERR = 902 ) |
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116 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_flx in configuration namelist', lwp ) |
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117 | IF(lwm) WRITE ( numond, namsbc_flx ) |
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118 | ! |
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119 | IF(lwp) THEN ! Namelist print |
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120 | WRITE(numout,*) |
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121 | WRITE(numout,*) 'sbc_flx : Flux forcing' |
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122 | WRITE(numout,*) '~~~~~~~~~~~' |
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123 | WRITE(numout,*) ' Namelist namsbc_flx : shelf seas configuration (force with winds instead of momentum)' |
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124 | WRITE(numout,*) ' shelf seas configuration ln_shelf_flx = ', ln_shelf_flx |
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125 | WRITE(numout,*) ' relative wind speed ln_rel_wind = ', ln_rel_wind |
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126 | WRITE(numout,*) ' wind multiplication factor rn_wfac = ', rn_wfac |
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127 | ENDIF |
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128 | ! ! check: do we plan to use ln_dm2dc with non-daily forcing? |
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129 | IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) & |
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130 | & CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' ) |
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131 | ! |
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132 | ! ! store namelist information in an array |
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133 | slf_i(jp_utau) = sn_utau ; slf_i(jp_vtau) = sn_vtau |
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134 | slf_i(jp_qtot) = sn_qtot ; slf_i(jp_qsr ) = sn_qsr |
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135 | slf_i(jp_emp ) = sn_emp |
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136 | ! |
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137 | ALLOCATE( sf(jpfld), STAT=ierror ) ! set sf structure |
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138 | IF( ln_shelf_flx ) slf_i(jp_press) = sn_press |
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139 | |
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140 | ! define local jpfld depending on shelf_flx logical |
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141 | IF( ln_shelf_flx ) THEN |
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142 | jpfld_local = jpfld |
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143 | ELSE |
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144 | jpfld_local = jpfld-1 |
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145 | ENDIF |
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146 | ! |
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147 | IF( ierror > 0 ) THEN |
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148 | CALL ctl_stop( 'sbc_flx: unable to allocate sf structure' ) ; RETURN |
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149 | ENDIF |
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150 | DO ji= 1, jpfld_local |
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151 | ALLOCATE( sf(ji)%fnow(jpi,jpj,1) ) |
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152 | IF( slf_i(ji)%ln_tint ) ALLOCATE( sf(ji)%fdta(jpi,jpj,1,2) ) |
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153 | END DO |
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154 | ! ! fill sf with slf_i and control print |
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155 | CALL fld_fill( sf, slf_i, cn_dir, 'sbc_flx', 'flux formulation for ocean surface boundary condition', 'namsbc_flx' ) |
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156 | ! |
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157 | sfx(:,:) = 0.0_wp ! salt flux due to freezing/melting (non-zero only if ice is present; set in limsbc(_2).F90) |
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158 | ! |
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159 | ENDIF |
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160 | |
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161 | CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step |
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162 | |
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163 | IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN ! update ocean fluxes at each SBC frequency |
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164 | |
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165 | !!UKMO SHELF wind speed relative to surface currents - put here to allow merging with coupling branch |
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166 | IF( ln_shelf_flx ) THEN |
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167 | CALL wrk_alloc( jpi,jpj, zwnd_i, zwnd_j ) |
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168 | |
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169 | IF( ln_rel_wind ) THEN |
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170 | DO jj = 1, jpj |
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171 | DO ji = 1, jpi |
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172 | zwnd_i(ji,jj) = sf(jp_utau)%fnow(ji,jj,1) - rn_wfac * ssu_m(ji,jj) |
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173 | zwnd_j(ji,jj) = sf(jp_vtau)%fnow(ji,jj,1) - rn_wfac * ssv_m(ji,jj) |
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174 | END DO |
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175 | END DO |
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176 | ELSE |
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177 | zwnd_i(:,:) = sf(jp_utau)%fnow(:,:,1) |
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178 | zwnd_j(:,:) = sf(jp_vtau)%fnow(:,:,1) |
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179 | ENDIF |
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180 | ENDIF |
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181 | |
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182 | IF( ln_dm2dc ) THEN ; qsr(:,:) = sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) ! modify now Qsr to include the diurnal cycle |
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183 | ELSE ; qsr(:,:) = sf(jp_qsr)%fnow(:,:,1) |
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184 | ENDIF |
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185 | !CDIR COLLAPSE |
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186 | !!UKMO SHELF effect of atmospheric pressure on SSH |
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187 | ! If using ln_apr_dyn, this is done there so don't repeat here. |
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188 | IF( ln_shelf_flx .AND. .NOT. ln_apr_dyn) THEN |
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189 | DO jj = 1, jpjm1 |
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190 | DO ji = 1, jpim1 |
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191 | apgu(ji,jj) = (-1.0/rau0)*(sf(jp_press)%fnow(ji+1,jj,1)-sf(jp_press)%fnow(ji,jj,1))/e1u(ji,jj) |
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192 | apgv(ji,jj) = (-1.0/rau0)*(sf(jp_press)%fnow(ji,jj+1,1)-sf(jp_press)%fnow(ji,jj,1))/e2v(ji,jj) |
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193 | END DO |
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194 | END DO |
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195 | ENDIF ! ln_shelf_flx |
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196 | |
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197 | DO jj = 1, jpj ! set the ocean fluxes from read fields |
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198 | DO ji = 1, jpi |
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199 | IF( ln_shelf_flx ) THEN |
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200 | !! UKMO SHELF - need atmospheric pressure to calculate Haney forcing |
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201 | pressnow(ji,jj) = sf(jp_press)%fnow(ji,jj,1) |
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202 | !! UKMO SHELF flux files contain wind speed not wind stress |
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203 | totwindspd = sqrt(zwnd_i(ji,jj)*zwnd_i(ji,jj) + zwnd_j(ji,jj)*zwnd_j(ji,jj)) |
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204 | cs = 0.63 + (0.066 * totwindspd) |
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205 | utau(ji,jj) = cs * (rhoa/rau0) * zwnd_i(ji,jj) * totwindspd |
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206 | vtau(ji,jj) = cs * (rhoa/rau0) * zwnd_j(ji,jj) * totwindspd |
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207 | ELSE |
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208 | utau(ji,jj) = sf(jp_utau)%fnow(ji,jj,1) |
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209 | vtau(ji,jj) = sf(jp_vtau)%fnow(ji,jj,1) |
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210 | ENDIF |
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211 | qsr (ji,jj) = sf(jp_qsr )%fnow(ji,jj,1) |
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212 | IF( ln_foam_flx .OR. ln_shelf_flx ) THEN |
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213 | !! UKMO FOAM flux files contain non-solar heat flux (qns) rather than total heat flux (qtot) |
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214 | qns (ji,jj) = sf(jp_qtot)%fnow(ji,jj,1) |
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215 | !! UKMO FOAM flux files contain the net DOWNWARD freshwater flux P-E rather then E-P |
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216 | emp (ji,jj) = -1. * sf(jp_emp )%fnow(ji,jj,1) |
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217 | ELSE |
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218 | qns (ji,jj) = sf(jp_qtot)%fnow(ji,jj,1) - sf(jp_qsr)%fnow(ji,jj,1) |
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219 | emp (ji,jj) = sf(jp_emp )%fnow(ji,jj,1) |
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220 | ENDIF |
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221 | END DO |
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222 | END DO |
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223 | ! ! add modification due to drag coefficient read from wave forcing |
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224 | ! ! this code is inefficient but put here to allow merging with another UKMO branch |
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225 | IF( ln_shelf_flx ) THEN |
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226 | ! calculate first the wind module, as it will be used later |
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227 | DO jj = 2, jpjm1 |
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228 | DO ji = fs_2, fs_jpim1 ! vect. opt. |
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229 | ztx = zwnd_i(ji-1,jj ) + zwnd_i(ji,jj) |
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230 | zty = zwnd_j(ji ,jj-1) + zwnd_j(ji,jj) |
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231 | wndm(ji,jj) = 0.5 * SQRT( ztx * ztx + zty * zty ) |
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232 | END DO |
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233 | END DO |
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234 | CALL lbc_lnk( wndm(:,:), 'T', 1. ) |
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235 | |
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236 | IF( ln_cdgw .AND. nn_drag == jp_std ) THEN |
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237 | IF( cpl_wdrag ) THEN |
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238 | ! reset utau and vtau to the wind components: the momentum will |
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239 | ! be calculated from the coupled value of the drag coefficient |
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240 | DO jj = 1, jpj |
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241 | DO ji = 1, jpi |
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242 | utau(ji,jj) = zwnd_i(ji,jj) |
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243 | vtau(ji,jj) = zwnd_j(ji,jj) |
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244 | END DO |
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245 | END DO |
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246 | ELSE |
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247 | DO jj = 1, jpjm1 |
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248 | DO ji = 1, jpim1 |
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249 | utau(ji,jj) = zrhoa * 0.5 * ( cdn_wave(ji,jj) + cdn_wave(ji+1,jj) ) * zwnd_i(ji,jj) * & |
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250 | 0.5 * ( wndm(ji,jj) + wndm(ji+1,jj) ) |
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251 | vtau(ji,jj) = zrhoa * 0.5 * ( cdn_wave(ji,jj) + cdn_wave(ji,jj+1) ) * zwnd_j(ji,jj) * & |
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252 | 0.5 * ( wndm(ji,jj) + wndm(ji,jj+1) ) |
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253 | END DO |
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254 | END DO |
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255 | CALL lbc_lnk_multi( utau(:,:), 'U', -1., vtau(:,:), 'V', -1. ) |
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256 | ENDIF |
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257 | ELSE IF( nn_drag == jp_const ) THEN |
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258 | DO jj = 1, jpjm1 |
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259 | DO ji = 1, jpim1 |
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260 | utau(ji,jj) = zrhoa * zcdrag * zwnd_i(ji,jj) * 0.5 * ( wndm(ji,jj) + wndm(ji+1,jj) ) |
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261 | vtau(ji,jj) = zrhoa * zcdrag * zwnd_j(ji,jj) * 0.5 * ( wndm(ji,jj) + wndm(ji,jj+1) ) |
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262 | END DO |
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263 | END DO |
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264 | CALL lbc_lnk_multi( utau(:,:), 'U', -1., vtau(:,:), 'V', -1. ) |
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265 | ENDIF |
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266 | ENDIF |
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267 | ! ! add to qns the heat due to e-p |
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268 | qns(:,:) = qns(:,:) - emp(:,:) * sst_m(:,:) * rcp ! mass flux is at SST |
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269 | ! |
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270 | |
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271 | !! UKMO FOAM wind fluxes need lbc_lnk calls owing to a bug in interp.exe |
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272 | IF( ln_foam_flx ) THEN |
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273 | CALL lbc_lnk( utau(:,:), 'U', -1. ) |
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274 | CALL lbc_lnk( vtau(:,:), 'V', -1. ) |
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275 | ENDIF |
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276 | |
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277 | ! ! module of wind stress and wind speed at T-point |
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278 | zcoef = 1. / ( zrhoa * zcdrag ) |
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279 | !CDIR NOVERRCHK |
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280 | DO jj = 2, jpjm1 |
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281 | !CDIR NOVERRCHK |
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282 | DO ji = fs_2, fs_jpim1 ! vect. opt. |
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283 | ztx = utau(ji-1,jj ) + utau(ji,jj) |
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284 | zty = vtau(ji ,jj-1) + vtau(ji,jj) |
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285 | zmod = 0.5 * SQRT( ztx * ztx + zty * zty ) |
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286 | taum(ji,jj) = zmod |
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287 | IF ( .NOT. (ln_shelf_flx .AND. ln_cpl)) THEN |
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288 | wndm(ji,jj) = SQRT( zmod * zcoef ) |
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289 | ENDIF |
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290 | END DO |
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291 | END DO |
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292 | taum(:,:) = taum(:,:) * tmask(:,:,1) ; wndm(:,:) = wndm(:,:) * tmask(:,:,1) |
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293 | CALL lbc_lnk( taum(:,:), 'T', 1. ) ; CALL lbc_lnk( wndm(:,:), 'T', 1. ) |
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294 | |
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295 | IF( nitend-nit000 <= 100 .AND. lwp ) THEN ! control print (if less than 100 time-step asked) |
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296 | WRITE(numout,*) |
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297 | WRITE(numout,*) ' read daily momentum, heat and freshwater fluxes OK' |
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298 | DO jf = 1, jpfld_local |
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299 | IF( jf == jp_utau .OR. jf == jp_vtau ) zfact = 1. |
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300 | IF( jf == jp_qtot .OR. jf == jp_qsr ) zfact = 0.1 |
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301 | IF( jf == jp_emp ) zfact = 86400. |
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302 | WRITE(numout,*) |
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303 | WRITE(numout,*) ' day: ', ndastp , TRIM(sf(jf)%clvar), ' * ', zfact |
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304 | CALL prihre( sf(jf)%fnow, jpi, jpj, 1, jpi, 20, 1, jpj, 10, zfact, numout ) |
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305 | END DO |
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306 | CALL FLUSH(numout) |
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307 | ENDIF |
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308 | ! |
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309 | IF( ln_shelf_flx ) THEN |
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310 | CALL wrk_dealloc( jpi,jpj, zwnd_i, zwnd_j ) |
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311 | ENDIF |
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312 | ! |
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313 | ENDIF |
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314 | ! |
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315 | END SUBROUTINE sbc_flx |
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316 | |
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317 | !!====================================================================== |
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318 | END MODULE sbcflx |
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