1 | MODULE usrdef_sbc |
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2 | !!====================================================================== |
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3 | !! *** MODULE usrdef_sbc *** |
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4 | !! Ocean forcing: user defined momentum, heat and freshwater forcings |
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5 | !! |
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6 | !! === Here GYRE configuration === |
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7 | !! |
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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 GYRE 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 phycst ! physical constants |
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19 | ! |
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20 | USE in_out_manager ! I/O manager |
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21 | USE lib_mpp ! distribued memory computing library |
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22 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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23 | USE lib_fortran ! |
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24 | |
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25 | IMPLICIT NONE |
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26 | PRIVATE |
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27 | |
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28 | PUBLIC usr_def_sbc ! routine called in sbcmod module |
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29 | |
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30 | !! * Substitutions |
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31 | # include "vectopt_loop_substitute.h90" |
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32 | !!---------------------------------------------------------------------- |
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33 | !! NEMO/OPA 4.0 , NEMO Consortium (2016) |
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34 | !! $Id: $ |
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35 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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36 | !!---------------------------------------------------------------------- |
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37 | CONTAINS |
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38 | |
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39 | SUBROUTINE usr_def_sbc( kt ) |
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40 | !!--------------------------------------------------------------------- |
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41 | !! *** ROUTINE usr_def_sbc *** |
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42 | !! |
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43 | !! ** Purpose : provide at each time-step the surface boundary |
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44 | !! condition, i.e. the momentum, heat and freshwater fluxes. |
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45 | !! |
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46 | !! ** Method : analytical seasonal cycle (all 0 fields, for overflow |
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47 | !! case). |
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48 | !! CAUTION : never mask the surface stress field ! |
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49 | !! |
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50 | !! ** Action : - set the ocean surface boundary condition, i.e. |
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51 | !! utau, vtau, taum, wndm, qns, qsr, emp, sfx |
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52 | !! |
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53 | !!---------------------------------------------------------------------- |
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54 | INTEGER, INTENT(in) :: kt ! ocean time step |
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55 | !! |
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56 | !SF INTEGER :: ji, jj ! dummy loop indices |
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57 | !SF INTEGER :: zyear0 ! initial year |
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58 | !SF INTEGER :: zmonth0 ! initial month |
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59 | !SF INTEGER :: zday0 ! initial day |
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60 | !SF INTEGER :: zday_year0 ! initial day since january 1st |
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61 | !SF REAL(wp) :: ztau , ztau_sais ! wind intensity and of the seasonal cycle |
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62 | !SF REAL(wp) :: ztime ! time in hour |
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63 | !SF REAL(wp) :: ztimemax , ztimemin ! 21th June, and 21th decem. if date0 = 1st january |
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64 | !SF REAL(wp) :: ztimemax1, ztimemin1 ! 21th June, and 21th decem. if date0 = 1st january |
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65 | !SF REAL(wp) :: ztimemax2, ztimemin2 ! 21th June, and 21th decem. if date0 = 1st january |
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66 | !SF REAL(wp) :: ztaun ! intensity |
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67 | !SF REAL(wp) :: zemp_s, zemp_n, zemp_sais, ztstar |
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68 | !SF REAL(wp) :: zcos_sais1, zcos_sais2, ztrp, zconv, t_star |
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69 | !SF REAL(wp) :: zsumemp, zsurf |
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70 | !SF REAL(wp) :: zrhoa = 1.22 ! Air density kg/m3 |
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71 | !SF REAL(wp) :: zcdrag = 1.5e-3 ! drag coefficient |
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72 | !SF REAL(wp) :: ztx, zty, zmod, zcoef ! temporary variables |
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73 | !SF REAL(wp) :: zyydd ! number of days in one year |
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74 | !SF ------- |
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75 | !SF sbc ana: |
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76 | REAL(wp) :: zrhoa = 1.22_wp ! air density kg/m3 |
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77 | REAL(wp) :: zcdrag = 1.5e-3_wp ! drag coefficient |
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78 | REAL(wp) :: zfact, ztx ! local scalars |
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79 | REAL(wp) :: zcoef, zty, zmod ! - - |
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80 | INTEGER :: nn_tau000 = 0 ! gently increase the stress over the first ntau_rst time-steps |
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81 | REAL(wp) :: rn_utau0 = 0.e0 ! uniform value for the i-stress |
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82 | REAL(wp) :: rn_vtau0 = 0.e0 ! uniform value for the j-stress |
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83 | REAL(wp) :: rn_qns0 = 0.e0 ! uniform value for the total heat flux |
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84 | REAL(wp) :: rn_qsr0 = 0.e0 ! uniform value for the solar radiation |
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85 | REAL(wp) :: rn_emp0 = 0.e0 ! uniform value for the freswater budget (E-P) |
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86 | ! |
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87 | !!--------------------------------------------------------------------- |
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88 | ! |
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89 | IF( kt == nit000 ) THEN |
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90 | ! |
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91 | IF(lwp) WRITE(numout,*)' sbc_ana : Constant surface fluxes read in namsbc_ana namelist' |
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92 | IF(lwp) WRITE(numout,*)' ~~~~~~~ ' |
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93 | IF(lwp) WRITE(numout,*)' spin up of the stress nn_tau000 = ', nn_tau000, ' time-steps' |
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94 | IF(lwp) WRITE(numout,*)' constant j-stress rn_vtau0 = ', rn_vtau0 , ' N/m2' |
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95 | IF(lwp) WRITE(numout,*)' non solar heat flux rn_qns0 = ', rn_qns0 , ' W/m2' |
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96 | IF(lwp) WRITE(numout,*)' solar heat flux rn_qsr0 = ', rn_qsr0 , ' W/m2' |
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97 | IF(lwp) WRITE(numout,*)' net heat flux rn_emp0 = ', rn_emp0 , ' Kg/m2/s' |
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98 | ! |
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99 | nn_tau000 = MAX( nn_tau000, 1 ) ! must be >= 1 |
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100 | ! |
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101 | utau(:,:) = rn_utau0 |
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102 | vtau(:,:) = rn_vtau0 |
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103 | taum(:,:) = SQRT ( rn_utau0 * rn_utau0 + rn_vtau0 * rn_vtau0 ) |
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104 | wndm(:,:) = SQRT ( taum(1,1) / ( zrhoa * zcdrag ) ) |
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105 | ! |
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106 | emp (:,:) = rn_emp0 |
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107 | sfx (:,:) = 0.0_wp |
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108 | qns (:,:) = rn_qns0 - emp(:,:) * sst_m(:,:) * rcp ! including heat content associated with mass flux at SST |
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109 | qsr (:,:) = rn_qsr0 |
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110 | ! |
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111 | ENDIF |
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112 | |
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113 | IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN |
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114 | ! |
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115 | IF( kt <= nn_tau000 ) THEN ! Increase the stress to its nominal value |
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116 | ! ! during the first nn_tau000 |
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117 | ! time-steps |
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118 | zfact = 0.5 * ( 1. - COS( rpi * REAL( kt, wp ) / REAL( nn_tau000, wp ) ) ) |
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119 | zcoef = 1. / ( zrhoa * zcdrag ) |
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120 | ztx = zfact * rn_utau0 |
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121 | zty = zfact * rn_vtau0 |
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122 | zmod = SQRT( ztx * ztx + zty * zty ) |
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123 | utau(:,:) = ztx |
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124 | vtau(:,:) = zty |
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125 | taum(:,:) = zmod |
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126 | zmod = SQRT( zmod * zcoef ) |
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127 | wndm(:,:) = zmod |
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128 | ENDIF |
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129 | ! ! update heat and fresh water fluxes |
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130 | ! ! as they may have been changed by |
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131 | ! sbcssr module |
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132 | emp (:,:) = rn_emp0 ! NB: qns changes with SST if emp /= 0 |
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133 | sfx (:,:) = 0._wp |
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134 | qns (:,:) = rn_qns0 - emp(:,:) * sst_m(:,:) * rcp |
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135 | qsr (:,:) = rn_qsr0 |
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136 | ! |
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137 | ENDIF |
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138 | ! |
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139 | !SF END sbc ana |
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140 | !SF ----------- |
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141 | |
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142 | END SUBROUTINE usr_def_sbc |
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143 | |
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144 | !!====================================================================== |
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145 | END MODULE usrdef_sbc |
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