1 | MODULE trazdf |
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2 | !!============================================================================== |
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3 | !! *** MODULE trazdf *** |
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4 | !! Ocean active tracers: vertical component of the tracer mixing trend |
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5 | !!============================================================================== |
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6 | !! History : 1.0 ! 2005-11 (G. Madec) Original code |
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7 | !! 3.0 ! 2008-01 (C. Ethe, G. Madec) merge TRC-TRA |
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8 | !!---------------------------------------------------------------------- |
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9 | |
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10 | !!---------------------------------------------------------------------- |
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11 | !! tra_zdf : Update the tracer trend with the vertical diffusion |
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12 | !! tra_zdf_init : initialisation of the computation |
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13 | !!---------------------------------------------------------------------- |
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14 | USE oce ! ocean dynamics and tracers variables |
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15 | USE dom_oce ! ocean space and time domain variables |
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16 | USE domvvl ! variable volume |
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17 | USE phycst ! physical constant |
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18 | USE zdf_oce ! ocean vertical physics variables |
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19 | USE sbc_oce ! surface boundary condition: ocean |
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20 | USE ldftra ! lateral diffusion: eddy diffusivity |
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21 | USE ldfslp ! lateral diffusion: iso-neutral slope |
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22 | USE trazdf_exp ! vertical diffusion: explicit (tra_zdf_exp routine) |
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23 | USE trazdf_imp ! vertical diffusion: implicit (tra_zdf_imp routine) |
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24 | USE trd_oce ! trends: ocean variables |
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25 | USE trdtra ! trends: tracer trend manager |
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26 | ! |
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27 | USE in_out_manager ! I/O manager |
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28 | USE prtctl ! Print control |
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29 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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30 | USE lib_mpp ! MPP library |
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31 | USE wrk_nemo ! Memory allocation |
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32 | USE timing ! Timing |
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33 | |
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34 | IMPLICIT NONE |
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35 | PRIVATE |
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36 | |
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37 | PUBLIC tra_zdf ! routine called by step.F90 |
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38 | PUBLIC tra_zdf_init ! routine called by nemogcm.F90 |
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39 | |
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40 | INTEGER :: nzdf = 0 ! type vertical diffusion algorithm used (defined from ln_zdf... namlist logicals) |
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41 | |
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42 | !! * Substitutions |
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43 | # include "zdfddm_substitute.h90" |
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44 | # include "vectopt_loop_substitute.h90" |
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45 | !!---------------------------------------------------------------------- |
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46 | !! NEMO/OPA 3.7 , NEMO Consortium (2015) |
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47 | !! $Id$ |
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48 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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49 | !!---------------------------------------------------------------------- |
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50 | CONTAINS |
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51 | |
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52 | SUBROUTINE tra_zdf( kt ) |
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53 | !!---------------------------------------------------------------------- |
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54 | !! *** ROUTINE tra_zdf *** |
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55 | !! |
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56 | !! ** Purpose : compute the vertical ocean tracer physics. |
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57 | !!--------------------------------------------------------------------- |
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58 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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59 | ! |
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60 | INTEGER :: jk ! Dummy loop indices |
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61 | REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdt, ztrds ! 3D workspace |
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62 | !!--------------------------------------------------------------------- |
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63 | ! |
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64 | IF( nn_timing == 1 ) CALL timing_start('tra_zdf') |
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65 | ! |
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66 | IF( neuler == 0 .AND. kt == nit000 ) THEN ! at nit000 |
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67 | r2dt = rdt ! = rdt (restarting with Euler time stepping) |
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68 | ELSEIF( kt <= nit000 + 1) THEN ! at nit000 or nit000+1 |
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69 | r2dt = 2. * rdt ! = 2 rdt (leapfrog) |
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70 | ENDIF |
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71 | ! |
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72 | IF( l_trdtra ) THEN !* Save ta and sa trends |
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73 | CALL wrk_alloc( jpi, jpj, jpk, ztrdt, ztrds ) |
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74 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) |
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75 | ztrds(:,:,:) = tsa(:,:,:,jp_sal) |
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76 | ENDIF |
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77 | ! |
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78 | SELECT CASE ( nzdf ) ! compute lateral mixing trend and add it to the general trend |
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79 | CASE ( 0 ) ; CALL tra_zdf_exp( kt, nit000, 'TRA', r2dt, nn_zdfexp, tsb, tsa, jpts ) ! explicit scheme |
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80 | CASE ( 1 ) ; CALL tra_zdf_imp( kt, nit000, 'TRA', r2dt, tsb, tsa, jpts ) ! implicit scheme |
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81 | END SELECT |
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82 | !!gm WHY here ! and I don't like that ! |
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83 | ! DRAKKAR SSS control { |
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84 | ! JMM avoid negative salinities near river outlet ! Ugly fix |
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85 | ! JMM : restore negative salinities to small salinities: |
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86 | WHERE( tsa(:,:,:,jp_sal) < 0._wp ) tsa(:,:,:,jp_sal) = 0.1_wp |
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87 | !!gm |
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88 | |
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89 | IF( l_trdtra ) THEN ! save the vertical diffusive trends for further diagnostics |
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90 | DO jk = 1, jpkm1 |
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91 | ztrdt(:,:,jk) = ( ( tsa(:,:,jk,jp_tem)*e3t_a(:,:,jk) - tsb(:,:,jk,jp_tem)*e3t_b(:,:,jk) ) & |
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92 | & / (e3t_n(:,:,jk)*r2dt) ) - ztrdt(:,:,jk) |
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93 | ztrds(:,:,jk) = ( ( tsa(:,:,jk,jp_sal)*e3t_a(:,:,jk) - tsb(:,:,jk,jp_sal)*e3t_b(:,:,jk) ) & |
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94 | & / (e3t_n(:,:,jk)*r2dt) ) - ztrds(:,:,jk) |
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95 | END DO |
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96 | !!gm this should be moved in trdtra.F90 and done on all trends |
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97 | CALL lbc_lnk( ztrdt, 'T', 1. ) |
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98 | CALL lbc_lnk( ztrds, 'T', 1. ) |
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99 | !!gm |
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100 | CALL trd_tra( kt, 'TRA', jp_tem, jptra_zdf, ztrdt ) |
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101 | CALL trd_tra( kt, 'TRA', jp_sal, jptra_zdf, ztrds ) |
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102 | CALL wrk_dealloc( jpi, jpj, jpk, ztrdt, ztrds ) |
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103 | ENDIF |
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104 | ! ! print mean trends (used for debugging) |
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105 | IF(ln_ctl) CALL prt_ctl( tab3d_1=tsa(:,:,:,jp_tem), clinfo1=' zdf - Ta: ', mask1=tmask, & |
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106 | & tab3d_2=tsa(:,:,:,jp_sal), clinfo2= ' Sa: ', mask2=tmask, clinfo3='tra' ) |
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107 | ! |
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108 | IF( nn_timing == 1 ) CALL timing_stop('tra_zdf') |
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109 | ! |
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110 | END SUBROUTINE tra_zdf |
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111 | |
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112 | |
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113 | SUBROUTINE tra_zdf_init |
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114 | !!---------------------------------------------------------------------- |
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115 | !! *** ROUTINE tra_zdf_init *** |
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116 | !! |
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117 | !! ** Purpose : Choose the vertical mixing scheme |
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118 | !! |
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119 | !! ** Method : Set nzdf from ln_zdfexp |
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120 | !! nzdf = 0 explicit (time-splitting) scheme (ln_zdfexp=T) |
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121 | !! = 1 implicit (euler backward) scheme (ln_zdfexp=F) |
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122 | !! NB: rotation of lateral mixing operator or TKE & GLS schemes, |
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123 | !! an implicit scheme is required. |
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124 | !!---------------------------------------------------------------------- |
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125 | USE zdftke |
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126 | USE zdfgls |
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127 | !!---------------------------------------------------------------------- |
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128 | ! |
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129 | ! Choice from ln_zdfexp already read in namelist in zdfini module |
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130 | IF( ln_zdfexp ) THEN ; nzdf = 0 ! use explicit scheme |
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131 | ELSE ; nzdf = 1 ! use implicit scheme |
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132 | ENDIF |
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133 | ! |
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134 | ! Force implicit schemes |
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135 | IF( lk_zdftke .OR. lk_zdfgls ) nzdf = 1 ! TKE, or GLS physics |
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136 | IF( ln_traldf_iso ) nzdf = 1 ! iso-neutral lateral physics |
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137 | IF( ln_traldf_hor .AND. ln_sco ) nzdf = 1 ! horizontal lateral physics in s-coordinate |
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138 | IF( ln_zdfexp .AND. nzdf == 1 ) CALL ctl_stop( 'tra_zdf : If using the rotation of lateral mixing operator', & |
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139 | & ' GLS or TKE scheme, the implicit scheme is required, set ln_zdfexp = .false.' ) |
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140 | ! |
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141 | IF(lwp) THEN |
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142 | WRITE(numout,*) |
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143 | WRITE(numout,*) 'tra_zdf_init : vertical tracer physics scheme' |
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144 | WRITE(numout,*) '~~~~~~~~~~~' |
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145 | IF( nzdf == 0 ) WRITE(numout,*) ' ===>> Explicit time-splitting scheme' |
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146 | IF( nzdf == 1 ) WRITE(numout,*) ' ===>> Implicit (euler backward) scheme' |
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147 | ENDIF |
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148 | ! |
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149 | END SUBROUTINE tra_zdf_init |
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150 | |
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151 | !!============================================================================== |
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152 | END MODULE trazdf |
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