1 | MODULE sbcfwb |
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2 | !!====================================================================== |
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3 | !! *** MODULE sbcfwb *** |
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4 | !! Ocean fluxes : domain averaged freshwater budget |
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5 | !!====================================================================== |
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6 | !! History : OPA ! 2001-02 (E. Durand) Original code |
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7 | !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module |
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8 | !! 3.0 ! 2006-08 (G. Madec) Surface module |
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9 | !! 3.2 ! 2009-07 (C. Talandier) emp mean s spread over erp area |
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10 | !!---------------------------------------------------------------------- |
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11 | |
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12 | !!---------------------------------------------------------------------- |
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13 | !! sbc_fwb : freshwater budget for global ocean configurations |
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14 | !! in free surface and forced mode |
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15 | !!---------------------------------------------------------------------- |
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16 | USE oce ! ocean dynamics and tracers |
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17 | USE dom_oce ! ocean space and time domain |
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18 | USE sbc_oce ! surface ocean boundary condition |
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19 | USE phycst ! physical constants |
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20 | USE sbcrnf ! ocean runoffs |
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21 | USE sbcssr ! SS damping terms |
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22 | USE in_out_manager ! I/O manager |
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23 | USE lib_mpp ! distribued memory computing library |
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24 | USE wrk_nemo ! work arrays |
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25 | USE timing ! Timing |
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26 | USE lbclnk ! ocean lateral boundary conditions |
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27 | USE lib_fortran |
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28 | |
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29 | IMPLICIT NONE |
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30 | PRIVATE |
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31 | |
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32 | PUBLIC sbc_fwb ! routine called by step |
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33 | |
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34 | REAL(wp) :: a_fwb_b ! annual domain averaged freshwater budget |
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35 | REAL(wp) :: a_fwb ! for 2 year before (_b) and before year. |
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36 | REAL(wp) :: fwfold ! fwfold to be suppressed |
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37 | REAL(wp) :: area ! global mean ocean surface (interior domain) |
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38 | |
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39 | !! * Substitutions |
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40 | # include "domzgr_substitute.h90" |
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41 | # include "vectopt_loop_substitute.h90" |
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42 | !!---------------------------------------------------------------------- |
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43 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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44 | !! $Id$ |
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45 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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46 | !!---------------------------------------------------------------------- |
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47 | CONTAINS |
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48 | |
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49 | SUBROUTINE sbc_fwb( kt, kn_fwb, kn_fsbc ) |
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50 | !!--------------------------------------------------------------------- |
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51 | !! *** ROUTINE sbc_fwb *** |
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52 | !! |
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53 | !! ** Purpose : Control the mean sea surface drift |
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54 | !! |
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55 | !! ** Method : several ways depending on kn_fwb |
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56 | !! =0 no control |
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57 | !! =1 global mean of emp set to zero at each nn_fsbc time step |
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58 | !! =2 annual global mean corrected from previous year |
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59 | !! Note: if sea ice is embedded it is taken into account when computing the budget |
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60 | !!---------------------------------------------------------------------- |
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61 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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62 | INTEGER, INTENT( in ) :: kn_fsbc ! |
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63 | INTEGER, INTENT( in ) :: kn_fwb ! ocean time-step index |
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64 | ! |
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65 | INTEGER :: inum, ikty, iyear ! local integers |
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66 | REAL(wp) :: z_fwf, z_fwf_nsrf, zsum_fwf, zsum_erp ! local scalars |
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67 | REAL(wp) :: zsurf_neg, zsurf_pos, zsurf_tospread, zcoef ! - - |
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68 | REAL(wp), POINTER, DIMENSION(:,:) :: ztmsk_neg, ztmsk_pos, z_wgt ! 2D workspaces |
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69 | REAL(wp), POINTER, DIMENSION(:,:) :: ztmsk_tospread, zerp_cor ! - - |
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70 | !!---------------------------------------------------------------------- |
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71 | ! |
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72 | IF( nn_timing == 1 ) CALL timing_start('sbc_fwb') |
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73 | ! |
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74 | CALL wrk_alloc( jpi,jpj, ztmsk_neg, ztmsk_pos, ztmsk_tospread, z_wgt, zerp_cor ) |
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75 | ! |
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76 | IF( kt == nit000 ) THEN |
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77 | IF(lwp) THEN |
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78 | WRITE(numout,*) |
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79 | WRITE(numout,*) 'sbc_fwb : FreshWater Budget correction' |
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80 | WRITE(numout,*) '~~~~~~~' |
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81 | IF( kn_fwb == 1 ) WRITE(numout,*) ' instantaneously set to zero' |
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82 | IF( kn_fwb == 2 ) WRITE(numout,*) ' adjusted from previous year budget' |
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83 | ENDIF |
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84 | ! |
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85 | area = glob_sum( e1e2t(:,:) ) ! interior global domain surface |
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86 | ! |
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87 | #if ! defined key_lim2 && ! defined key_lim3 && ! defined key_cice |
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88 | snwice_mass_b(:,:) = 0.e0 ! no sea-ice model is being used : no snow+ice mass |
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89 | snwice_mass (:,:) = 0.e0 |
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90 | #endif |
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91 | ! |
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92 | ENDIF |
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93 | |
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94 | |
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95 | SELECT CASE ( kn_fwb ) |
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96 | ! |
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97 | CASE ( 1 ) !== global mean fwf set to zero ==! |
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98 | ! |
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99 | IF( MOD( kt-1, kn_fsbc ) == 0 ) THEN |
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100 | z_fwf = glob_sum( e1e2t(:,:) * ( emp(:,:) - rnf(:,:) - snwice_fmass(:,:) ) ) / area ! sum over the global domain |
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101 | zcoef = z_fwf * rcp |
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102 | emp(:,:) = emp(:,:) - z_fwf |
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103 | qns(:,:) = qns(:,:) + zcoef * sst_m(:,:) ! account for change to the heat budget due to fw correction |
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104 | ENDIF |
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105 | ! |
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106 | CASE ( 2 ) !== fwf budget adjusted from the previous year ==! |
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107 | ! |
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108 | IF( kt == nit000 ) THEN ! initialisation |
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109 | ! ! Read the corrective factor on precipitations (fwfold) |
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110 | CALL ctl_opn( inum, 'EMPave_old.dat', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, numout, .FALSE. ) |
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111 | READ ( inum, "(24X,I8,2ES24.16)" ) iyear, a_fwb_b, a_fwb |
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112 | CLOSE( inum ) |
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113 | fwfold = a_fwb ! current year freshwater budget correction |
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114 | ! ! estimate from the previous year budget |
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115 | IF(lwp)WRITE(numout,*) |
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116 | IF(lwp)WRITE(numout,*)'sbc_fwb : year = ',iyear , ' freshwater budget correction = ', fwfold |
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117 | IF(lwp)WRITE(numout,*)' year = ',iyear-1, ' freshwater budget read = ', a_fwb |
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118 | IF(lwp)WRITE(numout,*)' year = ',iyear-2, ' freshwater budget read = ', a_fwb_b |
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119 | ENDIF |
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120 | ! ! Update fwfold if new year start |
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121 | ikty = 365 * 86400 / rdttra(1) !!bug use of 365 days leap year or 360d year !!!!!!! |
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122 | IF( MOD( kt, ikty ) == 0 ) THEN |
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123 | a_fwb_b = a_fwb ! mean sea level taking into account the ice+snow |
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124 | ! sum over the global domain |
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125 | a_fwb = glob_sum( e1e2t(:,:) * ( sshn(:,:) + snwice_mass(:,:) * r1_rau0 ) ) |
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126 | a_fwb = a_fwb * 1.e+3 / ( area * rday * 365. ) ! convert in Kg/m3/s = mm/s |
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127 | !!gm ! !!bug 365d year |
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128 | fwfold = a_fwb ! current year freshwater budget correction |
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129 | ! ! estimate from the previous year budget |
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130 | ENDIF |
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131 | ! |
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132 | IF( MOD( kt-1, kn_fsbc ) == 0 ) THEN ! correct the freshwater fluxes |
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133 | zcoef = fwfold * rcp |
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134 | emp(:,:) = emp(:,:) + fwfold |
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135 | qns(:,:) = qns(:,:) - zcoef * sst_m(:,:) ! account for change to the heat budget due to fw correction |
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136 | ENDIF |
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137 | ! |
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138 | IF( kt == nitend .AND. lwp ) THEN ! save fwfold value in a file |
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139 | CALL ctl_opn( inum, 'EMPave.dat', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, numout, .FALSE., narea ) |
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140 | WRITE( inum, "(24X,I8,2ES24.16)" ) nyear, a_fwb_b, a_fwb |
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141 | CLOSE( inum ) |
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142 | ENDIF |
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143 | ! |
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144 | CASE DEFAULT !== you should never be there ==! |
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145 | CALL ctl_stop( 'sbc_fwb : wrong nn_fwb value for the FreshWater Budget correction, choose either 1 or 2' ) |
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146 | ! |
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147 | END SELECT |
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148 | ! |
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149 | CALL wrk_dealloc( jpi,jpj, ztmsk_neg, ztmsk_pos, ztmsk_tospread, z_wgt, zerp_cor ) |
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150 | ! |
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151 | IF( nn_timing == 1 ) CALL timing_stop('sbc_fwb') |
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152 | ! |
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153 | END SUBROUTINE sbc_fwb |
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154 | |
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155 | !!====================================================================== |
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156 | END MODULE sbcfwb |
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