1 | !!---------------------------------------------------------------------- |
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2 | !! *** ocesbc_forced_noice.h90 *** |
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3 | !!---------------------------------------------------------------------- |
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4 | |
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5 | SUBROUTINE oce_sbc(kt) |
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6 | !!--------------------------------------------------------------------- |
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7 | !! *** ROUTINE oce_sbc *** |
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8 | !! |
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9 | !! ** Purpose : Ocean surface boundary conditions |
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10 | !! in forced mode using flux formulation or bulk formulation |
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11 | !! |
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12 | !! |
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13 | !! History : |
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14 | !! 1.0 ! 99-11 (M. Imbard) Original code |
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15 | !! ! 01-03 (D. Ludicone, E. Durand, G. Madec) free surf. |
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16 | !! 2.0 ! 02-09 (G. Madec, C. Ethe) F90: Free form and module |
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17 | !!---------------------------------------------------------------------- |
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18 | !! * Modules used |
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19 | USE daymod |
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20 | #if ! defined key_dtasst |
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21 | USE dtasst, ONLY : rclice |
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22 | #endif |
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23 | |
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24 | #if defined key_flx_bulk_monthly || defined key_flx_bulk_daily |
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25 | USE blk_oce |
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26 | #endif |
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27 | |
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28 | #if defined key_flx_forced_daily |
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29 | USE flx_oce |
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30 | #endif |
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31 | !! * arguments |
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32 | INTEGER, INTENT( in ) :: kt ! ocean time step |
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33 | |
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34 | !! * local declarations |
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35 | INTEGER :: ji, jj ! dummy loop arguments |
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36 | INTEGER :: i15, ifreq ! |
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37 | REAL(wp) :: zxy |
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38 | REAL(wp) :: zsice, zqri, zqrp, ztdta, zqrj |
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39 | REAL(wp) :: zq, zqi, zhemis, ztrp |
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40 | REAL(wp), DIMENSION(jpi,jpj) :: zeri, zerps, ziclim |
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41 | REAL(wp), DIMENSION(jpi,jpj) :: zqt, zqsr, zemp |
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42 | |
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43 | !!---------------------------------------------------------------------- |
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44 | !! OPA 8.5, LODYC-IPSL (2002) |
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45 | !!---------------------------------------------------------------------- |
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46 | |
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47 | ! 1. initialization to zero at kt = nit000 |
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48 | ! --------------------------------------- |
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49 | |
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50 | IF( kt == nit000 ) THEN |
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51 | qsr (:,:) = 0.e0 |
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52 | freeze (:,:) = 0.e0 |
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53 | qt (:,:) = 0.e0 |
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54 | q (:,:) = 0.e0 |
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55 | qrp (:,:) = 0.e0 |
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56 | emp (:,:) = 0.e0 |
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57 | emps (:,:) = 0.e0 |
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58 | erp (:,:) = 0.e0 |
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59 | #if defined key_dynspg_fsc |
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60 | dmp (:,:) = 0.e0 |
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61 | #endif |
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62 | ENDIF |
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63 | |
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64 | #if defined key_flx_bulk_monthly || defined key_flx_bulk_daily |
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65 | ifreq = nfbulk |
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66 | zqt (:,:) = qsr_oce(:,:) + qnsr_oce(:,:) |
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67 | zqsr(:,:) = qsr_oce(:,:) |
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68 | zemp(:,:) = evap(:,:) - tprecip(:,:) |
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69 | #endif |
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70 | |
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71 | #if defined key_flx_forced_daily |
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72 | ifreq = 1 |
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73 | zqt (:,:) = p_qt (:,:) |
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74 | zqsr(:,:) = p_qsr(:,:) |
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75 | zemp(:,:) = p_emp(:,:) |
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76 | #endif |
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77 | |
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78 | IF( MOD( kt-1, ifreq) == 0 ) THEN |
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79 | ! Computation of internal and evaporation damping terms |
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80 | CALL oce_sbc_dmp |
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81 | |
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82 | ztrp = -40. ! restoring terme for temperature (w/m2/k) |
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83 | zsice = - 0.04 / 0.8 ! ratio of isohaline compressibility over isotherme compressibility |
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84 | ! ( d rho / dt ) / ( d rho / ds ) ( s = 34, t = -1.8 ) |
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85 | ! Flux computation |
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86 | DO jj = 1, jpj |
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87 | DO ji = 1, jpi |
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88 | ! climatological ice |
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89 | #if defined key_dtasst |
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90 | ziclim(ji,jj) = FLOAT( NINT( rclice(ji,jj,1) ) ) |
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91 | #else |
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92 | ! tested only with key key_dtasst (A. Lazar 07/2001) |
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93 | ! this loop in CASE of interpolation of monthly rclice |
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94 | i15 = INT( 2.* FLOAT(nday) / (FLOAT( nobis(nmonth) ) + 0.5) ) |
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95 | zxy = FLOAT(nday) / FLOAT(nobis(nmonth)) + 0.5 - i15 |
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96 | ziclim(ji,jj) = FLOAT( NINT( (1-zxy) * rclice(ji,jj,1) + zxy * rclice(ji,jj,2) ) ) |
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97 | #endif |
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98 | |
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99 | ! avoid surfreezing point |
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100 | tn(ji,jj,1) = MAX( tn(ji,jj,1), fzptn(ji,jj) ) |
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101 | |
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102 | ! hemisphere indicator (=1 north, =-1 south) |
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103 | zhemis = FLOAT( isign(1, mjg(jj) - (jpjdta/2+1) ) ) |
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104 | |
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105 | ! restoring temperature (ztdta >= to local freezing temperature) |
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106 | #if defined key_dtasst |
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107 | ztdta = MAX( sst(ji,jj), fzptn(ji,jj) ) |
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108 | #else |
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109 | ztdta = MAX( t_dta(ji,jj,1), fzptn(ji,jj) ) |
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110 | #endif |
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111 | |
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112 | ! a) net downward radiative flux qsr() |
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113 | qsr(ji,jj) = zqsr(ji,jj) * tmask(ji,jj,1) |
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114 | |
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115 | ! b) heat flux damping term qrp() |
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116 | ! - gamma*(t-tlevitus) if no climatological ice (ziclim=0) |
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117 | ! - gamma*(t-(tgel-1.)) if climatological ice and no opa ice (ziclim=1 zicopa=0) |
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118 | ! - gamma*min(0,t-tgel) if climatological and opa ice (ziclim=1 zicopa=1) |
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119 | |
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120 | zqrp = ztrp * ( tb(ji,jj,1) - ztdta ) |
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121 | zqri = ztrp * ( tb(ji,jj,1) - ( fzptn(ji,jj) - 1.) ) |
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122 | zqrj = ztrp * MIN( 0., tb(ji,jj,1) - fzptn(ji,jj) ) |
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123 | qrp(ji,jj) = ( (1. - ziclim(ji,jj)) * zqrp & |
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124 | + ziclim(ji,jj) * ( ( 1 - freeze(ji,jj)) * zqri & |
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125 | + freeze(ji,jj) * zqrj ) ) * tmask(ji,jj,1) |
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126 | |
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127 | ! c) net downward heat flux q() = q0 + qrp() |
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128 | ! for q0 |
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129 | ! - ECMWF fluxes if no climatological ice (ziclim=0) |
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130 | ! - qrp if climatological ice and no opa ice (ziclim=1 zicopa=0) |
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131 | ! - -2 watt/m2 (arctic) or -4 watt/m2 (antarctic) if climatological and opa ice |
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132 | ! (ziclim=1 zicopa=1) |
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133 | zq = zqt(ji,jj) |
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134 | zqi = -3. + zhemis |
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135 | qt (ji,jj) = ( (1.-ziclim(ji,jj)) * zq & |
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136 | +ziclim(ji,jj) * freeze(ji,jj) * zqi ) & |
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137 | * tmask(ji,jj,1) & |
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138 | + qrp(ji,jj) |
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139 | q (ji,jj) = qt (ji,jj) |
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140 | |
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141 | END DO |
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142 | END DO |
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143 | |
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144 | #if defined key_dynspg_fsc |
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145 | ! Free-surface |
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146 | |
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147 | ! Water flux for zero buoyancy flux if no opa ice and ice clim |
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148 | zeri(:,:) = -zsice * qrp(:,:) * ro0cpr * rauw / 34.0 |
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149 | zerps(:,:) = ziclim(:,:) * ( (1-freeze(:,:)) * zeri(:,:) ) |
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150 | |
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151 | ! Contribution to sea level: |
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152 | ! net upward water flux emp() = e-p + runoff() + erp() + dmp + empold |
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153 | emp (:,:) = zemp(:,:) & ! e-p data |
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154 | + runoff(:,:) & ! runoff data |
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155 | + erp(:,:) & ! restoring term to SSS data |
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156 | + dmp(:,:) & ! freshwater flux associated with internal damping |
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157 | + empold ! domain averaged annual mean correction |
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158 | |
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159 | ! Contribution to salinity: |
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160 | ! net upward water flux emps() = e-p + runoff() + erp() + zerps + empold |
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161 | emps(:,:) = zemp(:,:) & |
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162 | + runoff(:,:) & |
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163 | + erp(:,:) & |
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164 | + zerps(:,:) & |
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165 | + empold |
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166 | #else |
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167 | ! Rigid-lid (emp=emps=E-P-R+Erp) |
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168 | ! freshwater flux |
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169 | zeri(:,:) = -zsice * qrp(:,:) * ro0cpr * rauw / 34.0 |
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170 | zerps(:,:) = ziclim(:,:) * ( (1-freeze(:,:)) * zeri(:,:) ) |
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171 | emps (:,:) = zemp(:,:) & |
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172 | + runoff(:,:) & |
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173 | + erp(:,:) & |
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174 | + zerps(:,:) |
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175 | emp (:,:) = emps(:,:) |
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176 | #endif |
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177 | |
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178 | |
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179 | ! Boundary condition on emp for free surface option |
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180 | ! ------------------------------------------------- |
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181 | CALL lbc_lnk( emp, 'T', 1. ) |
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182 | |
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183 | ENDIF |
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184 | |
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185 | END SUBROUTINE oce_sbc |
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