1 | MODULE wzvmod |
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2 | !! MODULE sshwzv |
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3 | !!============================================================================== |
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4 | !! *** MODULE sshwzv *** |
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5 | !! Ocean dynamics : sea surface height and vertical velocity |
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6 | !!============================================================================== |
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7 | !! History : 3.1 ! 2009-02 (G. Madec, M. Leclair) Original code |
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8 | !!---------------------------------------------------------------------- |
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9 | |
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10 | !!---------------------------------------------------------------------- |
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11 | !! ssh_wzv : after ssh & now vertical velocity |
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12 | !! ssh_nxt : filter ans swap the ssh arrays |
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13 | !! ssh_rst : read/write ssh restart fields in the ocean restart file |
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14 | !!---------------------------------------------------------------------- |
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15 | USE oce ! ocean dynamics and tracers variables |
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16 | USE dom_oce ! ocean space and time domain variables |
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17 | USE sbc_oce ! surface boundary condition: ocean |
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18 | USE domvvl ! Variable volume |
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19 | USE iom ! I/O library |
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20 | USE restart ! only for lrst_oce |
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21 | USE in_out_manager ! I/O manager |
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22 | USE prtctl ! Print control |
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23 | USE phycst |
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24 | USE lbclnk ! ocean lateral boundary condition (or mpp link) |
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25 | USE obc_par ! open boundary cond. parameter |
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26 | USE obc_oce |
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27 | |
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28 | IMPLICIT NONE |
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29 | PRIVATE |
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30 | |
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31 | PUBLIC ssh_wzv ! called by step.F90 |
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32 | PUBLIC ssh_nxt ! called by step.F90 |
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33 | |
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34 | !! * Substitutions |
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35 | # include "domzgr_substitute.h90" |
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36 | # include "vectopt_loop_substitute.h90" |
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37 | |
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38 | !!---------------------------------------------------------------------- |
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39 | !! NEMO/OPA 3.2 , LOCEAN-IPSL (2009) |
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40 | !! $Id$ |
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41 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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42 | !!---------------------------------------------------------------------- |
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43 | |
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44 | CONTAINS |
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45 | |
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46 | SUBROUTINE ssh_wzv( kt ) |
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47 | !!---------------------------------------------------------------------- |
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48 | !! *** ROUTINE ssh_wzv *** |
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49 | !! |
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50 | !! ** Purpose : compute the after ssh (ssha), the now vertical velocity |
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51 | !! and update the now vertical coordinate (lk_vvl=T). |
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52 | !! |
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53 | !! ** Method : - |
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54 | !! |
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55 | !! - Using the incompressibility hypothesis, the vertical |
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56 | !! velocity is computed by integrating the horizontal divergence |
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57 | !! from the bottom to the surface minus the scale factor evolution. |
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58 | !! The boundary conditions are w=0 at the bottom (no flux) and. |
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59 | !! |
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60 | !! ** action : ssha : after sea surface height |
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61 | !! wn : now vertical velocity |
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62 | !! if lk_vvl=T: sshu_a, sshv_a, sshf_a : after sea surface height |
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63 | !! at u-, v-, f-point s |
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64 | !! hu, hv, hur, hvr : ocean depth and its inverse at u-,v-points |
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65 | !!---------------------------------------------------------------------- |
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66 | INTEGER, INTENT(in) :: kt ! time step |
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67 | !! |
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68 | INTEGER :: ji, jj, jk ! dummy loop indices |
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69 | REAL(wp) :: zcoefu, zcoefv, zcoeff ! temporary scalars |
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70 | REAL(wp) :: z2dt, zraur ! temporary scalars |
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71 | REAL(wp), DIMENSION(jpi,jpj) :: zhdiv ! 2D workspace |
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72 | !!---------------------------------------------------------------------- |
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73 | |
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74 | IF( kt == nit000 ) THEN |
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75 | IF(lwp) WRITE(numout,*) |
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76 | IF(lwp) WRITE(numout,*) 'ssh_wzv : after sea surface height and now vertical velocity ' |
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77 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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78 | ! |
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79 | CALL ssh_rst( nit000, 'READ' ) ! read or initialize sshb and sshn |
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80 | ! |
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81 | wn(:,:,jpk) = 0.e0 ! bottom boundary condition: w=0 (set once for all) |
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82 | ! |
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83 | IF( lk_vvl ) THEN ! before and now Sea SSH at u-, v-, f-points (vvl case only) |
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84 | DO jj = 1, jpjm1 |
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85 | DO ji = 1, jpim1 ! caution: use of Vector Opt. not possible |
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86 | zcoefu = 0.5 * umask(ji,jj,1) / ( e1u(ji,jj) * e2u(ji,jj) ) |
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87 | zcoefv = 0.5 * vmask(ji,jj,1) / ( e1v(ji,jj) * e2v(ji,jj) ) |
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88 | zcoeff = 0.25 * umask(ji,jj,1) * umask(ji,jj+1,1) |
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89 | sshu_b(ji,jj) = zcoefu * ( e1t(ji ,jj) * e2t(ji ,jj) * sshb(ji ,jj) & |
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90 | & + e1t(ji+1,jj) * e2t(ji+1,jj) * sshb(ji+1,jj) ) |
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91 | sshv_b(ji,jj) = zcoefv * ( e1t(ji,jj ) * e2t(ji,jj ) * sshb(ji,jj ) & |
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92 | & + e1t(ji,jj+1) * e2t(ji,jj+1) * sshb(ji,jj+1) ) |
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93 | sshf_b(ji,jj) = zcoeff * ( sshb(ji ,jj) + sshb(ji ,jj+1) & |
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94 | & + sshb(ji+1,jj) + sshb(ji+1,jj+1) ) |
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95 | sshu_n(ji,jj) = zcoefu * ( e1t(ji ,jj) * e2t(ji ,jj) * sshn(ji ,jj) & |
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96 | & + e1t(ji+1,jj) * e2t(ji+1,jj) * sshn(ji+1,jj) ) |
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97 | sshv_n(ji,jj) = zcoefv * ( e1t(ji,jj ) * e2t(ji,jj ) * sshn(ji,jj ) & |
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98 | & + e1t(ji,jj+1) * e2t(ji,jj+1) * sshn(ji,jj+1) ) |
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99 | sshf_n(ji,jj) = zcoeff * ( sshn(ji ,jj) + sshn(ji ,jj+1) & |
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100 | & + sshn(ji+1,jj) + sshn(ji+1,jj+1) ) |
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101 | END DO |
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102 | END DO |
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103 | CALL lbc_lnk( sshu_b, 'U', 1. ) ; CALL lbc_lnk( sshu_n, 'U', 1. ) |
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104 | CALL lbc_lnk( sshv_b, 'V', 1. ) ; CALL lbc_lnk( sshv_n, 'V', 1. ) |
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105 | CALL lbc_lnk( sshf_b, 'F', 1. ) ; CALL lbc_lnk( sshf_n, 'F', 1. ) |
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106 | ENDIF |
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107 | ! |
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108 | ENDIF |
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109 | |
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110 | ! set time step size (Euler/Leapfrog) |
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111 | z2dt = 2. * rdt |
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112 | IF( neuler == 0 .AND. kt == nit000 ) z2dt =rdt |
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113 | |
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114 | zraur = 1. / rauw |
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115 | |
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116 | ! !------------------------------! |
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117 | ! ! After Sea Surface Height ! |
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118 | ! !------------------------------! |
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119 | zhdiv(:,:) = 0.e0 |
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120 | DO jk = 1, jpkm1 ! Horizontal divergence of barotropic transports |
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121 | zhdiv(:,:) = zhdiv(:,:) + fse3t(:,:,jk) * hdivn(:,:,jk) |
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122 | END DO |
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123 | |
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124 | ! ! Sea surface elevation time stepping |
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125 | ssha(:,:) = ( sshb(:,:) - z2dt * ( zraur * emp(:,:) + zhdiv(:,:) ) ) * tmask(:,:,1) |
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126 | |
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127 | #if defined key_obc |
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128 | # if defined key_agrif |
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129 | IF ( Agrif_Root() ) THEN |
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130 | # endif |
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131 | ssha(:,:) = ssha(:,:) * obctmsk(:,:) |
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132 | CALL lbc_lnk( ssha, 'T', 1. ) ! absolutly compulsory !! (jmm) |
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133 | # if defined key_agrif |
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134 | ENDIF |
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135 | # endif |
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136 | #endif |
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137 | |
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138 | ! ! Sea Surface Height at u-,v- and f-points (vvl case only) |
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139 | IF( lk_vvl ) THEN ! (required only in key_vvl case) |
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140 | DO jj = 1, jpjm1 |
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141 | DO ji = 1, fs_jpim1 ! Vector Opt. |
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142 | sshu_a(ji,jj) = 0.5 * umask(ji,jj,1) / ( e1u(ji ,jj) * e2u(ji ,jj) ) & |
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143 | & * ( e1t(ji ,jj) * e2t(ji ,jj) * ssha(ji ,jj) & |
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144 | & + e1t(ji+1,jj) * e2t(ji+1,jj) * ssha(ji+1,jj) ) |
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145 | sshv_a(ji,jj) = 0.5 * vmask(ji,jj,1) / ( e1v(ji,jj ) * e2v(ji,jj ) ) & |
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146 | & * ( e1t(ji,jj ) * e2t(ji,jj ) * ssha(ji,jj ) & |
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147 | & + e1t(ji,jj+1) * e2t(ji,jj+1) * ssha(ji,jj+1) ) |
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148 | sshf_a(ji,jj) = 0.25 * umask(ji,jj,1) * umask (ji,jj+1,1) & ! Caution : fmask not used |
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149 | & * ( ssha(ji ,jj) + ssha(ji ,jj+1) & |
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150 | & + ssha(ji+1,jj) + ssha(ji+1,jj+1) ) |
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151 | END DO |
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152 | END DO |
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153 | CALL lbc_lnk( sshu_a, 'U', 1. ) ! Boundaries conditions |
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154 | CALL lbc_lnk( sshv_a, 'V', 1. ) |
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155 | CALL lbc_lnk( sshf_a, 'F', 1. ) |
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156 | ENDIF |
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157 | |
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158 | ! !------------------------------! |
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159 | ! ! Now Vertical Velocity ! |
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160 | ! !------------------------------! |
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161 | ! ! integrate from the bottom the hor. divergence |
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162 | DO jk = jpkm1, 1, -1 |
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163 | wn(:,:,jk) = wn(:,:,jk+1) - fse3t_n(:,:,jk) * hdivn(:,:,jk) & |
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164 | & - ( fse3t_a(:,:,jk) & |
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165 | & - fse3t_b(:,:,jk) ) * tmask(:,:,jk) / z2dt |
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166 | END DO |
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167 | |
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168 | ! !------------------------------! |
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169 | ! ! Update Now Vertical coord. ! |
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170 | ! !------------------------------! |
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171 | IF( lk_vvl ) THEN ! only in vvl case) |
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172 | ! ! now local depth and scale factors (stored in fse3. arrays) |
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173 | DO jk = 1, jpkm1 |
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174 | fsdept(:,:,jk) = fsdept_n(:,:,jk) ! depths |
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175 | fsdepw(:,:,jk) = fsdepw_n(:,:,jk) |
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176 | fsde3w(:,:,jk) = fsde3w_n(:,:,jk) |
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177 | ! |
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178 | fse3t (:,:,jk) = fse3t_n (:,:,jk) ! vertical scale factors |
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179 | fse3u (:,:,jk) = fse3u_n (:,:,jk) |
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180 | fse3v (:,:,jk) = fse3v_n (:,:,jk) |
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181 | fse3f (:,:,jk) = fse3f_n (:,:,jk) |
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182 | fse3w (:,:,jk) = fse3w_n (:,:,jk) |
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183 | fse3uw(:,:,jk) = fse3uw_n(:,:,jk) |
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184 | fse3vw(:,:,jk) = fse3vw_n(:,:,jk) |
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185 | END DO |
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186 | ! ! ocean depth (at u- and v-points) |
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187 | hu(:,:) = hu_0(:,:) + sshu_n(:,:) |
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188 | hv(:,:) = hv_0(:,:) + sshv_n(:,:) |
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189 | ! ! masked inverse of the ocean depth (at u- and v-points) |
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190 | hur(:,:) = umask(:,:,1) / ( hu(:,:) + 1.e0 - umask(:,:,1) ) |
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191 | hvr(:,:) = vmask(:,:,1) / ( hv(:,:) + 1.e0 - vmask(:,:,1) ) |
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192 | |
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193 | ENDIF |
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194 | ! |
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195 | END SUBROUTINE ssh_wzv |
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196 | |
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197 | |
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198 | SUBROUTINE ssh_nxt( kt ) |
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199 | !!---------------------------------------------------------------------- |
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200 | !! *** ROUTINE ssh_nxt *** |
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201 | !! |
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202 | !! ** Purpose : achieve the sea surface height time stepping by |
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203 | !! applying Asselin time filter and swapping the arrays |
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204 | !! ssha already computed in ssh_wzv |
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205 | !! |
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206 | !! ** Method : - apply Asselin time fiter to now ssh and swap : |
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207 | !! sshn = ssha + atfp * ( sshb -2 sshn + ssha ) |
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208 | !! sshn = ssha |
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209 | !! |
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210 | !! ** action : - sshb, sshn : before & now sea surface height |
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211 | !! ready for the next time step |
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212 | !!---------------------------------------------------------------------- |
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213 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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214 | !! |
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215 | INTEGER :: ji, jj ! dummy loop indices |
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216 | !!---------------------------------------------------------------------- |
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217 | |
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218 | IF( kt == nit000 ) THEN |
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219 | IF(lwp) WRITE(numout,*) |
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220 | IF(lwp) WRITE(numout,*) 'ssh_nxt : next sea surface height (Asselin time filter + swap)' |
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221 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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222 | ENDIF |
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223 | |
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224 | ! Time filter and swap of the ssh |
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225 | ! ------------------------------- |
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226 | |
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227 | IF( lk_vvl ) THEN ! Variable volume levels : ssh at t-, u-, v, f-points |
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228 | ! ! ---------------------- ! |
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229 | IF( neuler == 0 .AND. kt == nit000 ) THEN ! Euler time-stepping at first time-step : no filter |
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230 | sshn (:,:) = ssha (:,:) ! now <-- after (before already = now) |
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231 | sshu_n(:,:) = sshu_a(:,:) |
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232 | sshv_n(:,:) = sshv_a(:,:) |
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233 | sshf_n(:,:) = sshf_a(:,:) |
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234 | ELSE ! Leap-Frog time-stepping: Asselin filter + swap |
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235 | DO jj = 1, jpj |
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236 | DO ji = 1, jpi ! before <-- now filtered |
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237 | sshb (ji,jj) = sshn(ji,jj) + atfp * ( sshb (ji,jj) - 2 * sshn (ji,jj) + ssha (ji,jj) ) |
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238 | sshu_b(ji,jj) = sshu_n(ji,jj) + atfp * ( sshu_b(ji,jj) - 2 * sshu_n(ji,jj) + sshu_a(ji,jj) ) |
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239 | sshv_b(ji,jj) = sshv_n(ji,jj) + atfp * ( sshv_b(ji,jj) - 2 * sshv_n(ji,jj) + sshv_a(ji,jj) ) |
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240 | sshf_b(ji,jj) = sshf_n(ji,jj) + atfp * ( sshf_b(ji,jj) - 2 * sshf_n(ji,jj) + sshf_a(ji,jj) ) |
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241 | sshn (ji,jj) = ssha (ji,jj) ! now <-- after |
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242 | sshu_n(ji,jj) = sshu_a(ji,jj) |
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243 | sshv_n(ji,jj) = sshv_a(ji,jj) |
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244 | sshf_n(ji,jj) = sshf_a(ji,jj) |
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245 | END DO |
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246 | END DO |
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247 | ENDIF |
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248 | ! |
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249 | ELSE ! fixed levels : ssh at t-point only |
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250 | ! ! ------------ ! |
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251 | IF( neuler == 0 .AND. kt == nit000 ) THEN ! Euler time-stepping at first time-step : no filter |
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252 | sshn(:,:) = ssha(:,:) ! now <-- after (before already = now) |
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253 | ! |
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254 | ELSE ! Leap-Frog time-stepping: Asselin filter + swap |
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255 | DO jj = 1, jpj |
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256 | DO ji = 1, jpi ! before <-- now filtered |
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257 | sshb(ji,jj) = sshn(ji,jj) + atfp * ( sshb(ji,jj) - 2 * sshn(ji,jj) + ssha(ji,jj) ) |
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258 | sshn(ji,jj) = ssha(ji,jj) ! now <-- after |
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259 | END DO |
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260 | END DO |
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261 | ENDIF |
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262 | ! |
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263 | ENDIF |
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264 | |
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265 | ! ! write filtered free surface arrays in restart file |
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266 | IF( lrst_oce ) CALL ssh_rst( kt, 'WRITE' ) |
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267 | ! |
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268 | IF(ln_ctl) CALL prt_ctl(tab2d_1=sshb , clinfo1=' sshb - : ', mask1=tmask, ovlap=1 ) |
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269 | ! |
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270 | END SUBROUTINE ssh_nxt |
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271 | |
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272 | |
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273 | SUBROUTINE ssh_rst( kt, cdrw ) |
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274 | !!--------------------------------------------------------------------- |
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275 | !! *** ROUTINE ssh_rst *** |
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276 | !! |
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277 | !! ** Purpose : Read or write Sea Surface Height arrays in restart file |
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278 | !! |
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279 | !! ** action : - cdrw = READ : sshb, sshn read in ocean restart file |
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280 | !! - cdrw = WRITE : sshb, sshn written in ocean restart file |
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281 | !!---------------------------------------------------------------------- |
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282 | INTEGER , INTENT(in) :: kt ! ocean time-step |
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283 | CHARACTER(len=*), INTENT(in) :: cdrw ! "READ"/"WRITE" flag |
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284 | !!---------------------------------------------------------------------- |
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285 | ! |
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286 | IF( TRIM(cdrw) == 'READ' ) THEN |
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287 | IF( iom_varid( numror, 'sshn', ldstop = .FALSE. ) > 0 ) THEN |
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288 | CALL iom_get( numror, jpdom_autoglo, 'sshb' , sshb(:,:) ) |
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289 | CALL iom_get( numror, jpdom_autoglo, 'sshn' , sshn(:,:) ) |
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290 | IF( neuler == 0 ) sshb(:,:) = sshn(:,:) |
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291 | ELSE |
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292 | IF( nn_rstssh == 1 ) THEN |
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293 | sshb(:,:) = 0.e0 |
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294 | sshn(:,:) = 0.e0 |
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295 | ENDIF |
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296 | ENDIF |
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297 | ELSEIF( TRIM(cdrw) == 'WRITE' ) THEN |
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298 | CALL iom_rstput( kt, nitrst, numrow, 'sshb' , sshb(:,:) ) |
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299 | CALL iom_rstput( kt, nitrst, numrow, 'sshn' , sshn(:,:) ) |
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300 | ENDIF |
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301 | ! |
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302 | END SUBROUTINE ssh_rst |
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303 | |
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304 | !!====================================================================== |
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305 | END MODULE wzvmod |
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