1 | MODULE istate |
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2 | !!====================================================================== |
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3 | !! *** MODULE istate *** |
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4 | !! Ocean state : initial state setting |
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5 | !!===================================================================== |
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6 | !! History : 4.0 ! 89-12 (P. Andrich) Original code |
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7 | !! 5.0 ! 91-11 (G. Madec) rewritting |
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8 | !! 6.0 ! 96-01 (G. Madec) terrain following coordinates |
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9 | !! 8.0 ! 01-09 (M. Levy, M. Ben Jelloul) istate_eel |
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10 | !! 8.0 ! 01-09 (M. Levy, M. Ben Jelloul) istate_uvg |
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11 | !! 9.0 ! 03-08 (G. Madec) F90: Free form, modules |
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12 | !! 9.0 ! 03-09 (G. Madec, C. Talandier) add EEL R5 |
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13 | !! 9.0 ! 04-05 (A. Koch-Larrouy) istate_gyre |
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14 | !! 9.0 ! 06-07 (S. Masson) distributed restart using iom |
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15 | !!---------------------------------------------------------------------- |
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16 | |
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17 | !!---------------------------------------------------------------------- |
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18 | !! istate_init : initial state setting |
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19 | !! istate_tem : analytical profile for initial Temperature |
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20 | !! istate_sal : analytical profile for initial Salinity |
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21 | !! istate_eel : initial state setting of EEL R5 configuration |
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22 | !! istate_gyre : initial state setting of GYRE configuration |
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23 | !! istate_uvg : initial velocity in geostropic balance |
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24 | !!---------------------------------------------------------------------- |
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25 | USE oce ! ocean dynamics and active tracers |
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26 | USE dom_oce ! ocean space and time domain |
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27 | USE daymod ! |
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28 | USE ldftra_oce ! ocean active tracers: lateral physics |
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29 | USE zdf_oce ! ocean vertical physics |
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30 | USE phycst ! physical constants |
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31 | USE wzvmod ! verctical velocity (wzv routine) |
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32 | USE dtatem ! temperature data (dta_tem routine) |
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33 | USE dtasal ! salinity data (dta_sal routine) |
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34 | USE restart ! ocean restart (rst_read routine) |
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35 | USE solisl ! ??? |
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36 | USE in_out_manager ! I/O manager |
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37 | USE iom |
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38 | USE c1d ! re-initialization of u-v mask for the 1D configuration |
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39 | USE zpshde ! partial step: hor. derivative (zps_hde routine) |
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40 | USE eosbn2 ! equation of state (eos bn2 routine) |
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41 | USE domvvl ! varying vertical mesh |
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42 | USE dynspg_oce ! pressure gradient schemes |
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43 | USE dynspg_flt ! pressure gradient schemes |
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44 | USE dynspg_exp ! pressure gradient schemes |
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45 | USE dynspg_ts ! pressure gradient schemes |
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46 | |
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47 | IMPLICIT NONE |
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48 | PRIVATE |
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49 | |
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50 | PUBLIC istate_init ! routine called by step.F90 |
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51 | |
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52 | !! * Substitutions |
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53 | # include "domzgr_substitute.h90" |
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54 | # include "vectopt_loop_substitute.h90" |
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55 | !!---------------------------------------------------------------------- |
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56 | !! OPA 9.0 , LOCEAN-IPSL (2006) |
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57 | !! $Id$ |
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58 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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59 | !!---------------------------------------------------------------------- |
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60 | |
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61 | CONTAINS |
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62 | |
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63 | SUBROUTINE istate_init |
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64 | !!---------------------------------------------------------------------- |
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65 | !! *** ROUTINE istate_init *** |
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66 | !! |
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67 | !! ** Purpose : Initialization of the dynamics and tracer fields. |
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68 | !!---------------------------------------------------------------------- |
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69 | USE eosbn2 ! eq. of state, Brunt Vaisala frequency (eos routine) |
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70 | |
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71 | IF(lwp) WRITE(numout,*) |
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72 | IF(lwp) WRITE(numout,*) 'istate_ini : Initialization of the dynamics and tracers' |
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73 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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74 | |
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75 | rhd (:,:,:) = 0.e0 |
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76 | rhop (:,:,:) = 0.e0 |
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77 | rn2 (:,:,:) = 0.e0 |
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78 | |
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79 | IF( ln_rstart ) THEN ! Restart from a file |
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80 | ! ! ------------------- |
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81 | neuler = 1 ! Set time-step indicator at nit000 (leap-frog) |
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82 | CALL rst_read ! Read the restart file |
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83 | CALL day( -1 ) ! model calendar (using both namelist and restart infos) |
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84 | ELSE |
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85 | ! ! Start from rest |
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86 | ! ! --------------- |
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87 | neuler = 0 ! Set time-step indicator at nit000 (euler forward) |
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88 | adatrj = 0._wp |
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89 | CALL day( -1 ) ! model calendar (using namelist infos) |
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90 | numror = 0 ! define numror = 0 -> no restart file to read |
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91 | ! ! Initialization of ocean to zero |
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92 | ! before fields ! now fields |
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93 | ub (:,:,:) = 0.e0 ; un (:,:,:) = 0.e0 ; sshb(:,:) = 0.e0 |
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94 | vb (:,:,:) = 0.e0 ; vn (:,:,:) = 0.e0 ; sshn(:,:) = 0.e0 |
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95 | rotb (:,:,:) = 0.e0 ; rotn (:,:,:) = 0.e0 |
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96 | hdivb(:,:,:) = 0.e0 ; hdivn(:,:,:) = 0.e0 |
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97 | ! |
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98 | IF( cp_cfg == 'eel' ) THEN |
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99 | CALL istate_eel ! EEL configuration : start from pre-defined |
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100 | ! ! velocity and thermohaline fields |
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101 | ELSEIF( cp_cfg == 'gyre' ) THEN |
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102 | CALL istate_gyre ! GYRE configuration : start from pre-defined temperature |
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103 | ! ! and salinity fields |
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104 | ELSE |
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105 | ! ! Other configurations: Initial temperature and salinity fields |
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106 | #if defined key_dtatem |
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107 | CALL dta_tem( nit000 ) ! read 3D temperature data |
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108 | tb(:,:,:) = t_dta(:,:,:) ! use temperature data read |
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109 | tn(:,:,:) = t_dta(:,:,:) |
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110 | #else |
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111 | IF(lwp) WRITE(numout,*) ! analytical temperature profile |
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112 | IF(lwp) WRITE(numout,*)' Temperature initialization using an analytic profile' |
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113 | CALL istate_tem |
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114 | #endif |
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115 | #if defined key_dtasal |
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116 | CALL dta_sal( nit000 ) ! read 3D salinity data |
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117 | sb(:,:,:) = s_dta(:,:,:) ! use salinity data read |
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118 | sn(:,:,:) = s_dta(:,:,:) |
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119 | #else |
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120 | ! No salinity data |
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121 | IF(lwp)WRITE(numout,*) ! analytical salinity profile |
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122 | IF(lwp)WRITE(numout,*)' Salinity initialisation using a constant value' |
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123 | CALL istate_sal |
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124 | #endif |
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125 | ENDIF |
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126 | |
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127 | CALL eos( tb, sb, rhd, rhop ) ! before potential and in situ densities |
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128 | |
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129 | IF( ln_zps .AND. .NOT. lk_c1d ) & |
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130 | & CALL zps_hde( nit000, tb, sb, rhd, & ! Partial steps: before Horizontal DErivative |
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131 | & gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level |
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132 | & gtv, gsv, grv ) |
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133 | |
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134 | ENDIF |
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135 | |
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136 | IF( lk_vvl ) THEN |
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137 | ! read free surface arrays in restart file |
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138 | IF( ln_rstart ) THEN |
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139 | IF( lk_dynspg_flt ) CALL flt_rst( nit000, 'READ' ) ! read or initialize the following fields |
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140 | ! ! gcx, gcxb, sshb, sshn |
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141 | IF( lk_dynspg_ts ) CALL ts_rst ( nit000, 'READ' ) ! read or initialize the following fields |
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142 | ! ! sshb, sshn, sshb_b, sshn_b, un_b, vn_b |
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143 | IF( lk_dynspg_exp ) CALL exp_rst( nit000, 'READ' ) ! read or initialize the following fields |
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144 | ! ! sshb, sshn |
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145 | ENDIF |
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146 | ! |
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147 | IF( .NOT. lk_dynspg_flt ) sshbb(:,:) = sshb(:,:) |
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148 | ! |
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149 | CALL dom_vvl ! ssh init and vertical grid update |
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150 | |
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151 | CALL eos_init ! usefull to get the equation state type neos parameter |
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152 | |
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153 | CALL bn2( tb, sb, rn2 ) ! before Brunt Vaissala frequency |
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154 | |
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155 | IF( .NOT. ln_rstart ) CALL wzv( nit000 ) |
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156 | |
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157 | ENDIF |
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158 | |
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159 | ! ! Vertical velocity |
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160 | ! ! ----------------- |
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161 | |
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162 | IF( .NOT. lk_vvl ) CALL wzv( nit000 ) ! from horizontal divergence |
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163 | ! |
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164 | END SUBROUTINE istate_init |
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165 | |
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166 | |
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167 | SUBROUTINE istate_tem |
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168 | !!--------------------------------------------------------------------- |
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169 | !! *** ROUTINE istate_tem *** |
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170 | !! |
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171 | !! ** Purpose : Intialization of the temperature field with an |
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172 | !! analytical profile or a file (i.e. in EEL configuration) |
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173 | !! |
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174 | !! ** Method : Use Philander analytic profile of temperature |
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175 | !! |
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176 | !! References : Philander ??? |
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177 | !!---------------------------------------------------------------------- |
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178 | INTEGER :: ji, jj, jk |
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179 | !!---------------------------------------------------------------------- |
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180 | ! |
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181 | IF(lwp) WRITE(numout,*) |
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182 | IF(lwp) WRITE(numout,*) 'istate_tem : initial temperature profile' |
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183 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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184 | |
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185 | DO jk = 1, jpk |
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186 | DO jj = 1, jpj |
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187 | DO ji = 1, jpi |
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188 | tn(ji,jj,jk) = ( ( ( 7.5 - 0.*ABS(gphit(ji,jj))/30. ) & |
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189 | & *( 1.-TANH((fsdept(ji,jj,jk)-80.)/30.) ) & |
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190 | & + 10.*(5000.-fsdept(ji,jj,jk))/5000.) ) * tmask(ji,jj,jk) |
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191 | tb(ji,jj,jk) = tn(ji,jj,jk) |
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192 | END DO |
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193 | END DO |
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194 | END DO |
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195 | |
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196 | IF(lwp) CALL prizre( tn , jpi , jpj , jpk , jpj/2 , & |
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197 | & 1 , jpi , 5 , 1 , jpk , & |
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198 | & 1 , 1. , numout ) |
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199 | ! |
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200 | END SUBROUTINE istate_tem |
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201 | |
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202 | |
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203 | SUBROUTINE istate_sal |
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204 | !!--------------------------------------------------------------------- |
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205 | !! *** ROUTINE istate_sal *** |
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206 | !! |
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207 | !! ** Purpose : Intialize the salinity field with an analytic profile |
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208 | !! |
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209 | !! ** Method : Use to a constant value 35.5 |
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210 | !! |
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211 | !! ** Action : Initialize sn and sb |
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212 | !!---------------------------------------------------------------------- |
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213 | REAL(wp) :: zsal = 35.50_wp |
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214 | !!---------------------------------------------------------------------- |
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215 | |
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216 | IF(lwp) WRITE(numout,*) |
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217 | IF(lwp) WRITE(numout,*) 'istate_sal : initial salinity : ', zsal |
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218 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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219 | |
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220 | sn(:,:,:) = zsal * tmask(:,:,:) |
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221 | sb(:,:,:) = sn(:,:,:) |
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222 | |
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223 | END SUBROUTINE istate_sal |
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224 | |
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225 | |
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226 | SUBROUTINE istate_eel |
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227 | !!---------------------------------------------------------------------- |
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228 | !! *** ROUTINE istate_eel *** |
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229 | !! |
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230 | !! ** Purpose : Initialization of the dynamics and tracers for EEL R5 |
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231 | !! configuration (channel with or without a topographic bump) |
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232 | !! |
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233 | !! ** Method : - set temprature field |
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234 | !! - set salinity field |
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235 | !! - set velocity field including horizontal divergence |
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236 | !! and relative vorticity fields |
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237 | !!---------------------------------------------------------------------- |
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238 | USE eosbn2 ! eq. of state, Brunt Vaisala frequency (eos routine) |
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239 | USE divcur ! hor. divergence & rel. vorticity (div_cur routine) |
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240 | USE iom |
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241 | |
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242 | INTEGER :: inum ! temporary logical unit |
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243 | INTEGER :: ji, jj, jk ! dummy loop indices |
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244 | INTEGER :: ijloc |
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245 | REAL(wp) :: zh1, zh2, zslope, zcst, zfcor ! temporary scalars |
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246 | REAL(wp) :: zt1 = 15._wp, & ! surface temperature value (EEL R5) |
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247 | & zt2 = 5._wp, & ! bottom temperature value (EEL R5) |
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248 | & zsal = 35.0_wp, & ! constant salinity (EEL R2, R5 and R6) |
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249 | & zueel = 0.1_wp ! constant uniform zonal velocity (EEL R5) |
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250 | # if ! defined key_dynspg_rl |
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251 | REAL(wp), DIMENSION(jpiglo,jpjglo) :: zssh ! initial ssh over the global domain |
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252 | # endif |
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253 | !!---------------------------------------------------------------------- |
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254 | |
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255 | SELECT CASE ( jp_cfg ) |
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256 | ! ! ==================== |
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257 | CASE ( 5 ) ! EEL R5 configuration |
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258 | ! ! ==================== |
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259 | |
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260 | ! set temperature field with a linear profile |
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261 | ! ------------------------------------------- |
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262 | IF(lwp) WRITE(numout,*) |
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263 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: linear temperature profile' |
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264 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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265 | |
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266 | zh1 = gdept_0( 1 ) |
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267 | zh2 = gdept_0(jpkm1) |
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268 | |
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269 | zslope = ( zt1 - zt2 ) / ( zh1 - zh2 ) |
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270 | zcst = ( zt1 * ( zh1 - zh2) - ( zt1 - zt2 ) * zh1 ) / ( zh1 - zh2 ) |
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271 | |
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272 | DO jk = 1, jpk |
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273 | tn(:,:,jk) = ( zt2 + zt1 * exp( - fsdept(:,:,jk) / 1000 ) ) * tmask(:,:,jk) |
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274 | tb(:,:,jk) = tn(:,:,jk) |
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275 | END DO |
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276 | |
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277 | IF(lwp) CALL prizre( tn , jpi , jpj , jpk , jpj/2 , & |
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278 | & 1 , jpi , 5 , 1 , jpk , & |
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279 | & 1 , 1. , numout ) |
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280 | |
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281 | ! set salinity field to a constant value |
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282 | ! -------------------------------------- |
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283 | IF(lwp) WRITE(numout,*) |
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284 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal |
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285 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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286 | |
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287 | sn(:,:,:) = zsal * tmask(:,:,:) |
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288 | sb(:,:,:) = sn(:,:,:) |
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289 | |
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290 | |
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291 | # if ! defined key_dynspg_rl |
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292 | ! set the dynamics: U,V, hdiv, rot (and ssh if necessary) |
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293 | ! ---------------- |
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294 | ! Start EEL5 configuration with barotropic geostrophic velocities |
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295 | ! according the sshb and sshn SSH imposed. |
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296 | ! we assume a uniform grid (hence the use of e1t(1,1) for delta_y) |
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297 | ! we use the Coriolis frequency at mid-channel. |
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298 | |
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299 | ub(:,:,:) = zueel * umask(:,:,:) |
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300 | un(:,:,:) = ub(:,:,:) |
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301 | ijloc = mj0(INT(jpjglo-1)/2) |
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302 | zfcor = ff(1,ijloc) |
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303 | |
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304 | DO jj = 1, jpjglo |
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305 | zssh(:,jj) = - (FLOAT(jj)- FLOAT(jpjglo-1)/2.)*zueel*e1t(1,1)*zfcor/grav |
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306 | END DO |
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307 | |
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308 | IF(lwp) THEN |
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309 | WRITE(numout,*) ' Uniform zonal velocity for EEL R5:',zueel |
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310 | WRITE(numout,*) ' Geostrophic SSH profile as a function of y:' |
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311 | WRITE(numout,'(12(1x,f6.2))') zssh(1,:) |
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312 | ENDIF |
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313 | |
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314 | DO jj = 1, nlcj |
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315 | DO ji = 1, nlci |
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316 | sshb(ji,jj) = zssh( mig(ji) , mjg(jj) ) * tmask(ji,jj,1) |
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317 | END DO |
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318 | END DO |
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319 | sshb(nlci+1:jpi, : ) = 0.e0 ! set to zero extra mpp columns |
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320 | sshb( : ,nlcj+1:jpj) = 0.e0 ! set to zero extra mpp rows |
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321 | |
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322 | sshn(:,:) = sshb(:,:) ! set now ssh to the before value |
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323 | |
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324 | IF( nn_rstssh /= 0 ) THEN |
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325 | nn_rstssh = 0 ! hand-made initilization of ssh |
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326 | CALL ctl_warn( 'istate_eel: force nn_rstssh = 0' ) |
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327 | ENDIF |
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328 | |
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329 | ! horizontal divergence and relative vorticity (curl) |
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330 | CALL div_cur( nit000 ) |
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331 | |
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332 | ! N.B. the vertical velocity will be computed from the horizontal divergence field |
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333 | ! in istate by a call to wzv routine |
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334 | # endif |
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335 | |
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336 | |
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337 | ! ! ========================== |
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338 | CASE ( 2 , 6 ) ! EEL R2 or R6 configuration |
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339 | ! ! ========================== |
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340 | |
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341 | ! set temperature field with a NetCDF file |
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342 | ! ---------------------------------------- |
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343 | IF(lwp) WRITE(numout,*) |
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344 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R2 or R6: read initial temperature in a NetCDF file' |
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345 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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346 | |
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347 | CALL iom_open ( 'eel.initemp', inum ) |
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348 | CALL iom_get ( inum, jpdom_data, 'initemp', tb ) ! read before temprature (tb) |
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349 | CALL iom_close( inum ) |
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350 | |
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351 | tn(:,:,:) = tb(:,:,:) ! set nox temperature to tb |
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352 | |
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353 | IF(lwp) CALL prizre( tn , jpi , jpj , jpk , jpj/2 , & |
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354 | & 1 , jpi , 5 , 1 , jpk , & |
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355 | & 1 , 1. , numout ) |
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356 | |
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357 | |
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358 | ! set salinity field to a constant value |
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359 | ! -------------------------------------- |
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360 | IF(lwp) WRITE(numout,*) |
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361 | IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal |
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362 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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363 | |
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364 | sn(:,:,:) = zsal * tmask(:,:,:) |
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365 | sb(:,:,:) = sn(:,:,:) |
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366 | |
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367 | |
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368 | IF( lk_isl ) THEN |
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369 | ! Horizontal velocity : start from geostrophy (EEL config) |
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370 | CALL eos( tn, sn, rhd ) ! now in situ density |
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371 | CALL istate_uvg ! compute geostrophic velocity |
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372 | |
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373 | ! N.B. the vertical velocity will be computed from the horizontal divergence field |
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374 | ! in istate by a call to wzv routine |
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375 | ENDIF |
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376 | ! ! =========================== |
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377 | CASE DEFAULT ! NONE existing configuration |
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378 | ! ! =========================== |
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379 | WRITE(ctmp1,*) 'EEL with a ', jp_cfg,' km resolution is not coded' |
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380 | CALL ctl_stop( ctmp1 ) |
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381 | |
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382 | END SELECT |
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383 | |
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384 | END SUBROUTINE istate_eel |
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385 | |
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386 | |
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387 | SUBROUTINE istate_gyre |
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388 | !!---------------------------------------------------------------------- |
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389 | !! *** ROUTINE istate_gyre *** |
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390 | !! |
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391 | !! ** Purpose : Initialization of the dynamics and tracers for GYRE |
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392 | !! configuration (double gyre with rotated domain) |
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393 | !! |
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394 | !! ** Method : - set temprature field |
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395 | !! - set salinity field |
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396 | !!---------------------------------------------------------------------- |
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397 | INTEGER :: ji, jj, jk ! dummy loop indices |
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398 | INTEGER :: inum ! temporary logical unit |
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399 | INTEGER, PARAMETER :: ntsinit = 0 ! (0/1) (analytical/input data files) T&S initialization |
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400 | !!---------------------------------------------------------------------- |
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401 | |
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402 | SELECT CASE ( ntsinit) |
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403 | |
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404 | CASE ( 0 ) ! analytical T/S profil deduced from LEVITUS |
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405 | IF(lwp) WRITE(numout,*) |
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406 | IF(lwp) WRITE(numout,*) 'istate_gyre : initial analytical T and S profil deduced from LEVITUS ' |
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407 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' |
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408 | |
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409 | DO jk = 1, jpk |
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410 | DO jj = 1, jpj |
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411 | DO ji = 1, jpi |
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412 | tn(ji,jj,jk) = ( 16. - 12. * TANH( (fsdept(ji,jj,jk) - 400) / 700 ) ) & |
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413 | & * (-TANH( (500-fsdept(ji,jj,jk)) / 150 ) + 1) / 2 & |
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414 | & + ( 15. * ( 1. - TANH( (fsdept(ji,jj,jk)-50.) / 1500.) ) & |
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415 | & - 1.4 * TANH((fsdept(ji,jj,jk)-100.) / 100.) & |
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416 | & + 7. * (1500. - fsdept(ji,jj,jk)) / 1500. ) & |
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417 | & * (-TANH( (fsdept(ji,jj,jk) - 500) / 150) + 1) / 2 |
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418 | tn(ji,jj,jk) = tn(ji,jj,jk) * tmask(ji,jj,jk) |
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419 | tb(ji,jj,jk) = tn(ji,jj,jk) |
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420 | |
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421 | sn(ji,jj,jk) = ( 36.25 - 1.13 * TANH( (fsdept(ji,jj,jk) - 305) / 460 ) ) & |
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422 | & * (-TANH((500 - fsdept(ji,jj,jk)) / 150) + 1) / 2 & |
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423 | & + ( 35.55 + 1.25 * (5000. - fsdept(ji,jj,jk)) / 5000. & |
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424 | & - 1.62 * TANH( (fsdept(ji,jj,jk) - 60. ) / 650. ) & |
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425 | & + 0.2 * TANH( (fsdept(ji,jj,jk) - 35. ) / 100. ) & |
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426 | & + 0.2 * TANH( (fsdept(ji,jj,jk) - 1000.) / 5000.) ) & |
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427 | & * (-TANH((fsdept(ji,jj,jk) - 500) / 150) + 1) / 2 |
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428 | sn(ji,jj,jk) = sn(ji,jj,jk) * tmask(ji,jj,jk) |
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429 | sb(ji,jj,jk) = sn(ji,jj,jk) |
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430 | END DO |
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431 | END DO |
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432 | END DO |
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433 | |
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434 | CASE ( 1 ) ! T/S data fields read in dta_tem.nc/data_sal.nc files |
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435 | IF(lwp) WRITE(numout,*) |
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436 | IF(lwp) WRITE(numout,*) 'istate_gyre : initial T and S read from dta_tem.nc/data_sal.nc files' |
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437 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' |
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438 | IF(lwp) WRITE(numout,*) ' NetCDF FORMAT' |
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439 | |
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440 | ! Read temperature field |
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441 | ! ---------------------- |
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442 | CALL iom_open ( 'data_tem', inum ) |
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443 | CALL iom_get ( inum, jpdom_data, 'votemper', tn ) |
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444 | CALL iom_close( inum ) |
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445 | |
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446 | tn(:,:,:) = tn(:,:,:) * tmask(:,:,:) |
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447 | tb(:,:,:) = tn(:,:,:) |
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448 | |
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449 | ! Read salinity field |
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450 | ! ------------------- |
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451 | CALL iom_open ( 'data_sal', inum ) |
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452 | CALL iom_get ( inum, jpdom_data, 'vosaline', sn ) |
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453 | CALL iom_close( inum ) |
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454 | |
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455 | sn(:,:,:) = sn(:,:,:) * tmask(:,:,:) |
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456 | sb(:,:,:) = sn(:,:,:) |
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457 | |
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458 | END SELECT |
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459 | |
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460 | IF(lwp) THEN |
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461 | WRITE(numout,*) |
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462 | WRITE(numout,*) ' Initial temperature and salinity profiles:' |
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463 | WRITE(numout, "(9x,' level gdept_0 temperature salinity ')" ) |
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464 | WRITE(numout, "(10x, i4, 3f10.2)" ) ( jk, gdept_0(jk), tn(2,2,jk), sn(2,2,jk), jk = 1, jpk ) |
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465 | ENDIF |
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466 | |
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467 | END SUBROUTINE istate_gyre |
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468 | |
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469 | |
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470 | SUBROUTINE istate_uvg |
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471 | !!---------------------------------------------------------------------- |
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472 | !! *** ROUTINE istate_uvg *** |
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473 | !! |
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474 | !! ** Purpose : Compute the geostrophic velocities from (tn,sn) fields |
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475 | !! |
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476 | !! ** Method : Using the hydrostatic hypothesis the now hydrostatic |
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477 | !! pressure is computed by integrating the in-situ density from the |
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478 | !! surface to the bottom. |
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479 | !! p=integral [ rau*g dz ] |
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480 | !!---------------------------------------------------------------------- |
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481 | USE dynspg ! surface pressure gradient (dyn_spg routine) |
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482 | USE divcur ! hor. divergence & rel. vorticity (div_cur routine) |
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483 | USE lbclnk ! ocean lateral boundary condition (or mpp link) |
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484 | |
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485 | INTEGER :: ji, jj, jk ! dummy loop indices |
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486 | INTEGER :: indic ! ??? |
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487 | REAL(wp) :: zmsv, zphv, zmsu, zphu, zalfg ! temporary scalars |
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488 | REAL(wp), DIMENSION (jpi,jpj,jpk) :: zprn ! workspace |
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489 | !!---------------------------------------------------------------------- |
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490 | |
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491 | IF(lwp) WRITE(numout,*) |
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492 | IF(lwp) WRITE(numout,*) 'istate_uvg : Start from Geostrophy' |
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493 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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494 | |
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495 | ! Compute the now hydrostatic pressure |
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496 | ! ------------------------------------ |
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497 | |
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498 | zalfg = 0.5 * grav * rau0 |
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499 | |
---|
500 | zprn(:,:,1) = zalfg * fse3w(:,:,1) * ( 1 + rhd(:,:,1) ) ! Surface value |
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501 | |
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502 | DO jk = 2, jpkm1 ! Vertical integration from the surface |
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503 | zprn(:,:,jk) = zprn(:,:,jk-1) & |
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504 | & + zalfg * fse3w(:,:,jk) * ( 2. + rhd(:,:,jk) + rhd(:,:,jk-1) ) |
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505 | END DO |
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506 | |
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507 | ! Compute geostrophic balance |
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508 | ! --------------------------- |
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509 | DO jk = 1, jpkm1 |
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510 | DO jj = 2, jpjm1 |
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511 | DO ji = fs_2, fs_jpim1 ! vertor opt. |
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512 | zmsv = 1. / MAX( umask(ji-1,jj+1,jk) + umask(ji ,jj+1,jk) & |
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513 | + umask(ji-1,jj ,jk) + umask(ji ,jj ,jk) , 1. ) |
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514 | zphv = ( zprn(ji ,jj+1,jk) - zprn(ji-1,jj+1,jk) ) * umask(ji-1,jj+1,jk) / e1u(ji-1,jj+1) & |
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515 | + ( zprn(ji+1,jj+1,jk) - zprn(ji ,jj+1,jk) ) * umask(ji ,jj+1,jk) / e1u(ji ,jj+1) & |
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516 | + ( zprn(ji ,jj ,jk) - zprn(ji-1,jj ,jk) ) * umask(ji-1,jj ,jk) / e1u(ji-1,jj ) & |
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517 | + ( zprn(ji+1,jj ,jk) - zprn(ji ,jj ,jk) ) * umask(ji ,jj ,jk) / e1u(ji ,jj ) |
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518 | zphv = 1. / rau0 * zphv * zmsv * vmask(ji,jj,jk) |
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519 | |
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520 | zmsu = 1. / MAX( vmask(ji+1,jj ,jk) + vmask(ji ,jj ,jk) & |
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521 | + vmask(ji+1,jj-1,jk) + vmask(ji ,jj-1,jk) , 1. ) |
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522 | zphu = ( zprn(ji+1,jj+1,jk) - zprn(ji+1,jj ,jk) ) * vmask(ji+1,jj ,jk) / e2v(ji+1,jj ) & |
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523 | + ( zprn(ji ,jj+1,jk) - zprn(ji ,jj ,jk) ) * vmask(ji ,jj ,jk) / e2v(ji ,jj ) & |
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524 | + ( zprn(ji+1,jj ,jk) - zprn(ji+1,jj-1,jk) ) * vmask(ji+1,jj-1,jk) / e2v(ji+1,jj-1) & |
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525 | + ( zprn(ji ,jj ,jk) - zprn(ji ,jj-1,jk) ) * vmask(ji ,jj-1,jk) / e2v(ji ,jj-1) |
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526 | zphu = 1. / rau0 * zphu * zmsu * umask(ji,jj,jk) |
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527 | |
---|
528 | ! Compute the geostrophic velocities |
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529 | un(ji,jj,jk) = -2. * zphu / ( ff(ji,jj) + ff(ji ,jj-1) ) |
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530 | vn(ji,jj,jk) = 2. * zphv / ( ff(ji,jj) + ff(ji-1,jj ) ) |
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531 | END DO |
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532 | END DO |
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533 | END DO |
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534 | |
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535 | IF(lwp) WRITE(numout,*) ' we force to zero bottom velocity' |
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536 | |
---|
537 | ! Susbtract the bottom velocity (level jpk-1 for flat bottom case) |
---|
538 | ! to have a zero bottom velocity |
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539 | |
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540 | DO jk = 1, jpkm1 |
---|
541 | un(:,:,jk) = ( un(:,:,jk) - un(:,:,jpkm1) ) * umask(:,:,jk) |
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542 | vn(:,:,jk) = ( vn(:,:,jk) - vn(:,:,jpkm1) ) * vmask(:,:,jk) |
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543 | END DO |
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544 | |
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545 | CALL lbc_lnk( un, 'U', -1. ) |
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546 | CALL lbc_lnk( vn, 'V', -1. ) |
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547 | |
---|
548 | ub(:,:,:) = un(:,:,:) |
---|
549 | vb(:,:,:) = vn(:,:,:) |
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550 | |
---|
551 | ! WARNING !!!!! |
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552 | ! after initializing u and v, we need to calculate the initial streamfunction bsf. |
---|
553 | ! Otherwise, only the trend will be computed and the model will blow up (inconsistency). |
---|
554 | ! to do that, we call dyn_spg with a special trick: |
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555 | ! we fill ua and va with the velocities divided by dt, and the streamfunction will be brought to the |
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556 | ! right value assuming the velocities have been set up in one time step. |
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557 | ! we then set bsfd to zero (first guess for next step is d(psi)/dt = 0.) |
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558 | ! sets up s false trend to calculate the barotropic streamfunction. |
---|
559 | |
---|
560 | ua(:,:,:) = ub(:,:,:) / rdt |
---|
561 | va(:,:,:) = vb(:,:,:) / rdt |
---|
562 | |
---|
563 | ! calls dyn_spg. we assume euler time step, starting from rest. |
---|
564 | indic = 0 |
---|
565 | CALL dyn_spg( nit000, indic ) ! surface pressure gradient |
---|
566 | |
---|
567 | ! the new velocity is ua*rdt |
---|
568 | |
---|
569 | CALL lbc_lnk( ua, 'U', -1. ) |
---|
570 | CALL lbc_lnk( va, 'V', -1. ) |
---|
571 | |
---|
572 | ub(:,:,:) = ua(:,:,:) * rdt |
---|
573 | vb(:,:,:) = va(:,:,:) * rdt |
---|
574 | ua(:,:,:) = 0.e0 |
---|
575 | va(:,:,:) = 0.e0 |
---|
576 | un(:,:,:) = ub(:,:,:) |
---|
577 | vn(:,:,:) = vb(:,:,:) |
---|
578 | |
---|
579 | #if defined key_dynspg_rl |
---|
580 | IF( lk_isl ) bsfb(:,:) = bsfn(:,:) ! Put bsfb to zero |
---|
581 | #endif |
---|
582 | |
---|
583 | ! Compute the divergence and curl |
---|
584 | |
---|
585 | CALL div_cur( nit000 ) ! now horizontal divergence and curl |
---|
586 | |
---|
587 | hdivb(:,:,:) = hdivn(:,:,:) ! set the before to the now value |
---|
588 | rotb (:,:,:) = rotn (:,:,:) ! set the before to the now value |
---|
589 | ! |
---|
590 | END SUBROUTINE istate_uvg |
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591 | |
---|
592 | !!===================================================================== |
---|
593 | END MODULE istate |
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