1 | MODULE trcsbc |
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2 | !!============================================================================== |
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3 | !! *** MODULE trcsbc *** |
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4 | !! Ocean passive tracers: surface boundary condition |
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5 | !!====================================================================== |
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6 | !! History : 8.2 ! 1998-10 (G. Madec, G. Roullet, M. Imbard) Original code |
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7 | !! 8.2 ! 2001-02 (D. Ludicone) sea ice and free surface |
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8 | !! 8.5 ! 2002-06 (G. Madec) F90: Free form and module |
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9 | !! 9.0 ! 2004-03 (C. Ethe) adapted for passive tracers |
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10 | !! ! 2006-08 (C. Deltel) Diagnose ML trends for passive tracers |
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11 | !!============================================================================== |
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12 | #if defined key_top |
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13 | !!---------------------------------------------------------------------- |
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14 | !! 'key_top' TOP models |
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15 | !!---------------------------------------------------------------------- |
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16 | !! trc_sbc : update the tracer trend at ocean surface |
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17 | !!---------------------------------------------------------------------- |
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18 | USE oce_trc ! ocean dynamics and active tracers variables |
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19 | USE trc ! ocean passive tracers variables |
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20 | USE prtctl_trc ! Print control for debbuging |
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21 | USE trdmod_oce |
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22 | USE trdtra |
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23 | ! MV 2013 |
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24 | USE sbc_oce ! Required to get access to fmmflx |
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25 | USE dom_oce ! Required to get access to r2dtra |
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26 | ! END MV 2013 |
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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 trc_sbc ! routine called by step.F90 |
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32 | |
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33 | !! * Substitutions |
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34 | # include "top_substitute.h90" |
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35 | !!---------------------------------------------------------------------- |
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36 | !! NEMO/TOP 3.3 , NEMO Consortium (2010) |
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37 | !! $Id$ |
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38 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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39 | !!---------------------------------------------------------------------- |
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40 | CONTAINS |
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41 | |
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42 | SUBROUTINE trc_sbc ( kt ) |
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43 | !!---------------------------------------------------------------------- |
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44 | !! *** ROUTINE trc_sbc *** |
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45 | !! |
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46 | !! ** Purpose : Compute the tracer surface boundary condition trend of |
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47 | !! (concentration/dilution effect) and add it to the general |
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48 | !! trend of tracer equations. |
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49 | !! |
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50 | !! ** Method : |
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51 | !! * concentration/dilution effect: |
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52 | !! The surface freshwater flux modify the ocean volume |
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53 | !! and thus the concentration of a tracer as : |
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54 | !! tra = tra + emp * trn / e3t for k=1 |
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55 | !! where emp, the surface freshwater budget (evaporation minus |
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56 | !! precipitation ) given in kg/m2/s is divided |
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57 | !! by 1035 kg/m3 (density of ocean water) to obtain m/s. |
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58 | !! |
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59 | !! ** Action : - Update the 1st level of tra with the trend associated |
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60 | !! with the tracer surface boundary condition |
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61 | !! |
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62 | !!---------------------------------------------------------------------- |
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63 | ! |
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64 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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65 | ! |
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66 | INTEGER :: ji, jj, jn ! dummy loop indices |
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67 | REAL(wp) :: zsrau, zse3t ! temporary scalars |
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68 | CHARACTER (len=22) :: charout |
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69 | REAL(wp), POINTER, DIMENSION(:,: ) :: zsfx |
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70 | REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrtrd |
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71 | |
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72 | ! MV 2013 |
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73 | REAL(wp) :: zswitch , & ! virtual salt flux or vvl |
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74 | zftra , & |
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75 | zcd , & |
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76 | zdtra , & |
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77 | ztfx , & |
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78 | ztra , & |
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79 | zeuler ! euler or leapfrog |
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80 | ! END MV 2013 |
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81 | !!--------------------------------------------------------------------- |
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82 | ! |
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83 | IF( nn_timing == 1 ) CALL timing_start('trc_sbc') |
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84 | ! |
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85 | ! Allocate temporary workspace |
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86 | CALL wrk_alloc( jpi, jpj, zsfx ) |
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87 | IF( l_trdtrc ) CALL wrk_alloc( jpi, jpj, jpk, ztrtrd ) |
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88 | |
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89 | ! MV 2013 |
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90 | SELECT CASE( nn_ice_embd ) ! levitating or embedded sea-ice option |
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91 | CASE( 0 ) ; zswitch = 1 ! (0) standard levitating sea-ice : salt exchange only |
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92 | CASE( 1, 2 ) ; zswitch = 0 ! (1) levitating sea-ice: salt and volume exchange but no pressure effect |
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93 | ! (2) embedded sea-ice : salt and volume fluxes and pressure |
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94 | END SELECT |
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95 | ! END MV 2013 |
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96 | |
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97 | IF( kt == nittrc000 ) THEN |
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98 | IF(lwp) WRITE(numout,*) |
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99 | IF(lwp) WRITE(numout,*) 'trc_sbc : Passive tracers surface boundary condition' |
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100 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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101 | ENDIF |
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102 | |
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103 | ! Coupling online : river runoff is added to the horizontal divergence (hdivn) in the subroutine sbc_rnf_div |
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104 | ! one only consider the concentration/dilution effect due to evaporation minus precipitation + freezing/melting of sea-ice |
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105 | ! Coupling offline : runoff are in emp which contains E-P-R |
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106 | ! |
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107 | IF( .NOT. lk_offline .AND. lk_vvl ) THEN ! online coupling with vvl |
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108 | zsfx(:,:) = 0._wp |
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109 | ELSE ! online coupling free surface or offline with free surface |
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110 | zsfx(:,:) = emp(:,:) |
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111 | ENDIF |
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112 | |
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113 | ! 0. initialization |
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114 | zsrau = 1. / rau0 |
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115 | IF ( neuler .EQ. 0 ) THEN |
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116 | zeuler = 0.0 |
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117 | ELSE |
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118 | zeuler = 1.0 |
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119 | ENDIF |
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120 | |
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121 | i_code = 1 |
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122 | |
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123 | DO jn = 1, jptra |
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124 | ! |
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125 | IF( l_trdtrc ) ztrtrd(:,:,:) = tra(:,:,:,jn) ! save trends |
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126 | ! ! add the trend to the general tracer trend |
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127 | ! MV 2013 sea ice tracers |
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128 | ! OLD LOOP |
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129 | IF ( i_code == 0 ) THEN |
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130 | |
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131 | DO jj = 2, jpj |
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132 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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133 | zse3t = 1. / fse3t(ji,jj,1) |
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134 | tra(ji,jj,1,jn) = tra(ji,jj,1,jn) + zsfx(ji,jj) * zsrau * trn(ji,jj,1,jn) * zse3t |
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135 | END DO |
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136 | END DO |
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137 | ! NEW LOOP |
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138 | |
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139 | ELSE ! i_code |
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140 | |
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141 | DO jj = 2, jpj |
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142 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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143 | |
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144 | zse3t = 1. / fse3t(ji,jj,1) |
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145 | |
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146 | ! tracer flux at the ice/ocean interface (tracer/m2/s) |
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147 | zftra = - trc_i(ji,jj,jn) * fmmflx(ji,jj) ! uptake of tracer in the sea ice |
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148 | zcd = trc_o(ji,jj,jn) * fmmflx(ji,jj) ! concentration dilution due to freezing-melting, |
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149 | ! only used in the levitating sea ice case |
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150 | ! tracer flux only : add concentration dilution term in net tracer flux, no F-M in volume flux |
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151 | ! tracer and mass fluxes : no concentration dilution term in net tracer flux, F-M term in volume flux |
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152 | ztfx = zftra + zswitch * zcd ! net tracer flux (+C/D if no ice/ocean mass exchange) |
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153 | |
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154 | ! tracer change (left member: euler; right member:leapfrog) |
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155 | ztra = ( 1. - zeuler ) * trn(ji,jj,1,jn) + zeuler * trb(ji,jj,1,jn) |
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156 | |
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157 | ! MAX is there to avoid integral ocean uptake in the case of freezing (for iron) |
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158 | zdtra = MAX ( - ztra / r2dtra(1) , zsrau * ( ztfx + zsfx(ji,jj) * trn(ji,jj,1,jn) ) * zse3t ) ! tracer tendency |
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159 | ! r2dtra is time step |
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160 | tra(ji,jj,1,jn) = tra(ji,jj,1,jn) + zdtra ! new line |
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161 | |
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162 | ! IF ( ztfx .NE. 0.0 ) THEN |
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163 | ! WRITE(numout,*) ji, jj, jn |
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164 | ! WRITE(numout,*) ' trc_o : ', trc_o(ji,jj,jn) |
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165 | ! WRITE(numout,*) ' trc_i : ', trc_i(ji,jj,jn) |
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166 | ! WRITE(numout,*) ' fmmflx : ', fmmflx(ji,jj) |
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167 | ! WRITE(numout,*) ' zswitch: ', zswitch |
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168 | ! WRITE(numout,*) ' zcd : ', zcd |
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169 | ! WRITE(numout,*) ' zftra : ', zftra |
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170 | ! WRITE(numout,*) ' ztfx : ', ztfx |
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171 | ! WRITE(numout,*) ' zsrau : ', zsrau |
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172 | ! WRITE(numout,*) ' zsfx : ', zsfx(ji,jj) |
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173 | ! WRITE(numout,*) ' zse3t : ', zse3t |
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174 | ! WRITE(numout,*) ' ztra : ', ztra |
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175 | ! WRITE(numout,*) ' zdtra : ', zdtra |
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176 | ! WRITE(numout,*) ' Old tendency : ', zsfx(ji,jj) * zsrau * trn(ji,jj,1,jn) * zse3t |
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177 | ! ENDIF |
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178 | |
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179 | END DO |
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180 | END DO |
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181 | |
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182 | ENDIF ! i_code |
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183 | ! END MV 2013 |
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184 | |
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185 | IF( l_trdtrc ) THEN |
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186 | ztrtrd(:,:,:) = tra(:,:,:,jn) - ztrtrd(:,:,:) |
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187 | CALL trd_tra( kt, 'TRC', jn, jptra_trd_nsr, ztrtrd ) |
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188 | END IF |
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189 | ! ! =========== |
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190 | END DO ! tracer loop |
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191 | ! ! =========== |
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192 | IF( ln_ctl ) THEN |
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193 | WRITE(charout, FMT="('sbc ')") ; CALL prt_ctl_trc_info(charout) |
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194 | CALL prt_ctl_trc( tab4d=tra, mask=tmask, clinfo=ctrcnm, clinfo2='trd' ) |
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195 | ENDIF |
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196 | CALL wrk_dealloc( jpi, jpj, zsfx ) |
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197 | IF( l_trdtrc ) CALL wrk_dealloc( jpi, jpj, jpk, ztrtrd ) |
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198 | ! |
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199 | IF( nn_timing == 1 ) CALL timing_stop('trc_sbc') |
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200 | ! |
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201 | END SUBROUTINE trc_sbc |
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202 | |
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203 | #else |
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204 | !!---------------------------------------------------------------------- |
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205 | !! Dummy module : NO passive tracer |
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206 | !!---------------------------------------------------------------------- |
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207 | CONTAINS |
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208 | SUBROUTINE trc_sbc (kt) ! Empty routine |
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209 | INTEGER, INTENT(in) :: kt |
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210 | WRITE(*,*) 'trc_sbc: You should not have seen this print! error?', kt |
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211 | END SUBROUTINE trc_sbc |
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212 | #endif |
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213 | |
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214 | !!====================================================================== |
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215 | END MODULE trcsbc |
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