1 | MODULE usrdef_sbc |
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2 | !!====================================================================== |
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3 | !! *** MODULE usrdef_sbc *** |
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4 | !! |
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5 | !! === ICE_RHEO configuration === |
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6 | !! |
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7 | !! User defined : surface forcing of a user configuration |
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8 | !!====================================================================== |
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9 | !! History : 4.0 ! 2016-03 (S. Flavoni, G. Madec) user defined interface |
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10 | !!---------------------------------------------------------------------- |
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11 | |
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12 | !!---------------------------------------------------------------------- |
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13 | !! usr_def_sbc : user defined surface bounday conditions in ICE_RHEO case |
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14 | !!---------------------------------------------------------------------- |
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15 | USE oce ! ocean dynamics and tracers |
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16 | USE dom_oce ! ocean space and time domain |
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17 | USE sbc_oce ! Surface boundary condition: ocean fields |
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18 | USE sbc_ice ! Surface boundary condition: ice fields |
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19 | USE phycst ! physical constants |
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20 | USE ice, ONLY : at_i_b, a_i_b, at_i, u_ice, v_ice |
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21 | USE icethd_dh ! for CALL ice_thd_snwblow |
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22 | ! |
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23 | USE in_out_manager ! I/O manager |
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24 | USE lib_mpp ! distribued memory computing library |
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25 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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26 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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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 usrdef_sbc_oce ! routine called by sbcmod.F90 for sbc ocean |
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32 | PUBLIC usrdef_sbc_ice_tau ! routine called by icestp.F90 for ice dynamics |
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33 | PUBLIC usrdef_sbc_ice_flx ! routine called by icestp.F90 for ice thermo |
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34 | |
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35 | !! * Substitutions |
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36 | # include "vectopt_loop_substitute.h90" |
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37 | !!---------------------------------------------------------------------- |
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38 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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39 | !! $Id: usrdef_sbc.F90 10074 2018-08-28 16:15:49Z nicolasmartin $ |
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40 | !! Software governed by the CeCILL license (see ./LICENSE) |
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41 | !!---------------------------------------------------------------------- |
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42 | CONTAINS |
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43 | |
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44 | SUBROUTINE usrdef_sbc_oce( kt ) |
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45 | !!--------------------------------------------------------------------- |
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46 | !! *** ROUTINE usr_def_sbc *** |
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47 | !! |
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48 | !! ** Purpose : provide at each time-step the surface boundary |
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49 | !! condition, i.e. the momentum, heat and freshwater fluxes. |
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50 | !! |
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51 | !! ** Method : all 0 fields, for ICE_RHEO case |
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52 | !! CAUTION : never mask the surface stress field ! |
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53 | !! |
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54 | !! ** Action : - set to ZERO all the ocean surface boundary condition, i.e. |
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55 | !! utau, vtau, taum, wndm, qns, qsr, emp, sfx |
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56 | !! |
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57 | !!---------------------------------------------------------------------- |
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58 | INTEGER, INTENT(in) :: kt ! ocean time step |
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59 | INTEGER :: ij0, ij1, ii0, ii1, jj, ji ! loop indices |
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60 | REAL(wp) :: zrhoco ! ocean density and drag coefficient product |
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61 | !!--------------------------------------------------------------------- |
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62 | ! |
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63 | IF( kt == nit000 ) THEN |
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64 | ! |
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65 | !IF(lwp) WRITE(numout,*)' usrdef_sbc_oce : ICE_RHEO case: ocean boudary conditions' |
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66 | |
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67 | utau(:,:) = 0._wp |
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68 | utau(:,:) = 0._wp |
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69 | |
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70 | !ij0 = 1 ; ij1 = 25 ! set boundary condition |
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71 | !ii0 = 975 ; ii1 = 1000 |
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72 | !DO jj = mj0(ij0), mj1(ij1) |
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73 | ! DO ji = mi0(ii0), mi1(ii1) |
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74 | ! utau(ji,jj) = -utau_ice(ji,jj) |
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75 | ! vtau(ji,jj) = -vtau_ice(ji,jj) |
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76 | ! END DO |
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77 | !END DO |
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78 | |
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79 | taum(:,:) = 0._wp ! assume these are not used |
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80 | wndm(:,:) = 0._wp |
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81 | ! |
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82 | emp (:,:) = 0._wp |
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83 | sfx (:,:) = 0._wp |
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84 | qns (:,:) = 0._wp |
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85 | qsr (:,:) = 0._wp |
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86 | ! |
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87 | utau_b(:,:) = 0._wp |
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88 | vtau_b(:,:) = 0._wp |
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89 | emp_b (:,:) = 0._wp |
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90 | sfx_b (:,:) = 0._wp |
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91 | qns_b (:,:) = 0._wp |
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92 | ! |
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93 | ENDIF |
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94 | ! |
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95 | END SUBROUTINE usrdef_sbc_oce |
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96 | |
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97 | SUBROUTINE usrdef_sbc_ice_tau( kt ) |
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98 | !!--------------------------------------------------------------------- |
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99 | !! *** ROUTINE usrdef_sbc_ice_tau *** |
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100 | !! |
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101 | !! ** Purpose : provide the surface boundary (momentum) condition over |
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102 | !sea-ice |
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103 | !!--------------------------------------------------------------------- |
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104 | INTEGER, INTENT(in) :: kt ! ocean time step |
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105 | INTEGER :: jj, ji ! loop indices |
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106 | |
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107 | REAL(wp) :: zwndi_f , zwndj_f, zwnorm_f ! relative wind module and components at F-point |
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108 | REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point |
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109 | REAL(wp), DIMENSION(jpi,jpj) :: windu, windv ! wind components (idealised forcing) |
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110 | REAL(wp), PARAMETER :: r_vfac = 1._wp ! relative velocity (make 0 for absolute velocity) |
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111 | REAL(wp), PARAMETER :: Rwind = -0.8_wp ! ratio of wind components |
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112 | REAL(wp), PARAMETER :: Umax = 15._wp ! maximum wind speed (m/s) |
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113 | REAL(wp), PARAMETER :: d = 2000._wp ! size of the domain (km) |
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114 | REAL(wp), PARAMETER :: res = 2._wp ! gridcell size |
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115 | REAL(wp), PARAMETER :: zrhoa = 1.22 ! Air density kg/m3 |
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116 | REAL(wp), PARAMETER :: Cd_atm = 1.4e-3 ! transfer coefficient over ice |
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117 | !!--------------------------------------------------------------------- |
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118 | ! extra code for test case |
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119 | IF( kt==nit000 .AND. lwp) WRITE(numout,*)' usrdef_sbc_ice : ICE_RHEO case: analytical stress forcing' |
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120 | |
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121 | DO jj = 2, jpjm1 |
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122 | DO ji = 2, jpim1 |
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123 | ! wind spins up over 6 hours, factor 1000 to balance the units |
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124 | windu(ji,jj) = Umax/sqrt(d*1000)*(d-2*mig(ji)*res)/((d-2*mig(ji)*res)**2+(d-2*mjg(jj)*res)**2*Rwind**2)**(1/4)*min(kt*30./21600,1.) |
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125 | windv(ji,jj) = Umax/sqrt(d*1000)*(d-2*mjg(jj)*res)/((d-2*mig(ji)*res)**2+(d-2*mjg(jj)*res)**2*Rwind**2)**(1/4)*Rwind*min(kt*30./21600,1.) |
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126 | END DO |
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127 | END DO |
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128 | CALL lbc_lnk_multi( 'usrdef_sbc', windu, 'U', -1., windv, 'V', -1. ) |
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129 | |
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130 | wndm_ice(:,:) = 0._wp !!gm brutal.... |
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131 | |
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132 | ! ------------------------------------------------------------ ! |
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133 | ! Wind module relative to the moving ice ( U10m - U_ice ) ! |
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134 | ! ------------------------------------------------------------ ! |
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135 | ! C-grid ice dynamics : U & V-points (same as ocean) |
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136 | DO jj = 2, jpjm1 |
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137 | DO ji = 2, jpim1 |
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138 | zwndi_t = ( windu(ji,jj) - r_vfac * 0.5 * ( u_ice(ji-1,jj ) + u_ice(ji,jj) ) ) |
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139 | zwndj_t = ( windv(ji,jj) - r_vfac * 0.5 * ( v_ice(ji,jj-1) + v_ice(ji,jj) ) ) |
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140 | wndm_ice(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1) |
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141 | END DO |
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142 | END DO |
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143 | CALL lbc_lnk( 'usrdef_sbc', wndm_ice, 'T', 1. ) |
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144 | |
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145 | !!gm brutal.... |
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146 | utau_ice (:,:) = 0._wp |
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147 | vtau_ice (:,:) = 0._wp |
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148 | !!gm end |
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149 | |
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150 | ! ------------------------------------------------------------ ! |
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151 | ! Wind stress relative to the moving ice ( U10m - U_ice ) ! |
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152 | ! ------------------------------------------------------------ ! |
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153 | ! C-grid ice dynamics : U & V-points (same as ocean) |
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154 | DO jj = 2, jpjm1 |
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155 | DO ji = 2, jpim1 |
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156 | utau_ice(ji,jj) = 0.5 * zrhoa * Cd_atm * ( wndm_ice(ji+1,jj ) + wndm_ice(ji,jj) ) & |
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157 | & * ( 0.5 * (windu(ji+1,jj) + windu(ji,jj) ) - r_vfac * u_ice(ji,jj) ) |
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158 | vtau_ice(ji,jj) = 0.5 * zrhoa * Cd_atm * ( wndm_ice(ji,jj+1 ) + wndm_ice(ji,jj) ) & |
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159 | & * ( 0.5 * (windv(ji,jj+1) + windv(ji,jj) ) - r_vfac * v_ice(ji,jj) ) |
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160 | END DO |
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161 | END DO |
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162 | CALL lbc_lnk_multi( 'usrdef_sbc', utau_ice, 'U', -1., vtau_ice, 'V', -1. ) |
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163 | ! |
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164 | END SUBROUTINE usrdef_sbc_ice_tau |
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165 | |
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166 | SUBROUTINE usrdef_sbc_ice_flx( kt, phs, phi ) |
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167 | !!--------------------------------------------------------------------- |
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168 | !! *** ROUTINE usrdef_sbc_ice_flx *** |
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169 | !! |
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170 | !! ** Purpose : provide the surface boundary (flux) condition over sea-ice |
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171 | !!--------------------------------------------------------------------- |
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172 | INTEGER, INTENT(in) :: kt ! ocean time step |
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173 | REAL(wp), DIMENSION(:,:,:), INTENT(in) :: phs ! snow thickness |
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174 | REAL(wp), DIMENSION(:,:,:), INTENT(in) :: phi ! ice thickness |
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175 | !! |
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176 | REAL(wp) :: zfr1, zfr2 ! local variables |
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177 | REAL(wp), DIMENSION(jpi,jpj) :: zsnw ! snw distribution after wind blowing |
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178 | !!--------------------------------------------------------------------- |
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179 | ! |
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180 | IF( kt==nit000 .AND. lwp) WRITE(numout,*)' usrdef_sbc_ice : ICE_RHEO case: NO flux forcing' |
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181 | ! |
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182 | ! ocean variables (renaming) |
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183 | emp_oce (:,:) = 0._wp ! uniform value for freshwater budget (E-P) |
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184 | qsr_oce (:,:) = 0._wp ! uniform value for solar radiation |
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185 | qns_oce (:,:) = 0._wp ! uniform value for non-solar radiation |
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186 | |
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187 | ! ice variables |
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188 | alb_ice (:,:,:) = 0.7_wp ! useless |
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189 | qsr_ice (:,:,:) = 0._wp ! uniform value for solar radiation |
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190 | qns_ice (:,:,:) = 0._wp ! uniform value for non-solar radiation |
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191 | sprecip (:,:) = 0._wp ! uniform value for snow precip |
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192 | evap_ice(:,:,:) = 0._wp ! uniform value for sublimation |
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193 | |
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194 | ! ice fields deduced from above |
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195 | zsnw(:,:) = 1._wp |
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196 | !!CALL lim_thd_snwblow( at_i_b, zsnw ) ! snow distribution over ice after wind blowing |
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197 | emp_ice (:,:) = SUM( a_i_b(:,:,:) * evap_ice(:,:,:), dim=3 ) - sprecip(:,:) * zsnw(:,:) |
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198 | emp_oce (:,:) = emp_oce(:,:) - sprecip(:,:) * (1._wp - zsnw(:,:) ) |
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199 | qevap_ice(:,:,:) = 0._wp |
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200 | qprec_ice(:,:) = rhos * ( sst_m(:,:) * rcpi - rLfus ) * tmask(:,:,1) ! in J/m3 |
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201 | qemp_oce (:,:) = - emp_oce(:,:) * sst_m(:,:) * rcp |
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202 | qemp_ice (:,:) = sprecip(:,:) * zsnw * ( sst_m(:,:) * rcpi - rLfus ) * tmask(:,:,1) ! solid precip (only) |
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203 | |
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204 | ! total fluxes |
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205 | emp_tot (:,:) = emp_ice + emp_oce |
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206 | qns_tot (:,:) = at_i_b(:,:) * qns_oce(:,:) + SUM( a_i_b(:,:,:) * qns_ice(:,:,:), dim=3 ) + qemp_ice(:,:) + qemp_oce(:,:) |
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207 | qsr_tot (:,:) = at_i_b(:,:) * qsr_oce(:,:) + SUM( a_i_b(:,:,:) * qsr_ice(:,:,:), dim=3 ) |
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208 | |
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209 | ! --- shortwave radiation transmitted below the surface (W/m2, see Grenfell Maykut 77) --- ! |
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210 | zfr1 = ( 0.18 * ( 1.0 - cldf_ice ) + 0.35 * cldf_ice ) ! transmission when hi>10cm |
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211 | zfr2 = ( 0.82 * ( 1.0 - cldf_ice ) + 0.65 * cldf_ice ) ! zfr2 such that zfr1 + zfr2 to equal 1 |
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212 | ! |
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213 | WHERE ( phs(:,:,:) <= 0._wp .AND. phi(:,:,:) < 0.1_wp ) ! linear decrease from hi=0 to 10cm |
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214 | qtr_ice_top(:,:,:) = qsr_ice(:,:,:) * ( zfr1 + zfr2 * ( 1._wp - phi(:,:,:) * 10._wp ) ) |
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215 | ELSEWHERE( phs(:,:,:) <= 0._wp .AND. phi(:,:,:) >= 0.1_wp ) ! constant (zfr1) when hi>10cm |
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216 | qtr_ice_top(:,:,:) = qsr_ice(:,:,:) * zfr1 |
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217 | ELSEWHERE ! zero when hs>0 |
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218 | qtr_ice_top(:,:,:) = 0._wp |
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219 | END WHERE |
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220 | |
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221 | END SUBROUTINE usrdef_sbc_ice_flx |
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222 | |
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223 | |
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224 | !!====================================================================== |
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225 | END MODULE usrdef_sbc |
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