1 | MODULE trcnxt |
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2 | !!====================================================================== |
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3 | !! *** MODULE trcnxt *** |
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4 | !! Ocean passive tracers: time stepping on passives tracers |
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5 | !!====================================================================== |
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6 | #if defined key_passivetrc |
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7 | !!---------------------------------------------------------------------- |
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8 | !! trc_nxt : time stepping on passive tracers |
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9 | !!---------------------------------------------------------------------- |
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10 | !! * Modules used |
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11 | USE oce_trc ! ocean dynamics and tracers variables |
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12 | USE trc ! ocean passive tracers variables |
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13 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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14 | USE trctrp_lec ! pasive tracers transport |
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15 | |
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16 | IMPLICIT NONE |
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17 | PRIVATE |
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18 | |
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19 | !! * Routine accessibility |
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20 | PUBLIC trc_nxt ! routine called by step.F90 |
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21 | !!---------------------------------------------------------------------- |
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22 | !! OPA 9.0 , LODYC-IPSL (2003) |
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23 | !!---------------------------------------------------------------------- |
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24 | |
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25 | CONTAINS |
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26 | |
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27 | SUBROUTINE trc_nxt( kt ) |
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28 | !!---------------------------------------------------------------------- |
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29 | !! *** ROUTINE trcnxt *** |
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30 | !! |
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31 | !! ** Purpose : Compute the passive tracers fields at the |
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32 | !! next time-step from their temporal trends and swap the fields. |
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33 | !! |
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34 | !! ** Method : Apply lateral boundary conditions on (ua,va) through |
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35 | !! call to lbc_lnk routine |
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36 | !! default: |
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37 | !! arrays swap |
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38 | !! (trn) = (tra) ; (tra) = (0,0) |
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39 | !! (trb) = (trn) |
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40 | !! |
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41 | !! For Arakawa or TVD Scheme : |
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42 | !! A Asselin time filter applied on now tracers (trn) to avoid |
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43 | !! the divergence of two consecutive time-steps and tr arrays |
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44 | !! to prepare the next time_step: |
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45 | !! (trb) = (trn) + atfp [ (trb) + (tra) - 2 (trn) ] |
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46 | !! (trn) = (tra) ; (tra) = (0,0) |
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47 | !! |
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48 | !! |
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49 | !! ** Action : - update trb, trn |
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50 | !! |
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51 | !! History : |
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52 | !! 7.0 ! 91-11 (G. Madec) Original code |
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53 | !! ! 93-03 (M. Guyon) symetrical conditions |
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54 | !! ! 95-02 (M. Levy) passive tracers |
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55 | !! ! 96-02 (G. Madec & M. Imbard) opa release 8.0 |
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56 | !! 8.0 ! 96-04 (A. Weaver) Euler forward step |
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57 | !! 8.2 ! 99-02 (G. Madec, N. Grima) semi-implicit pressure grad. |
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58 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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59 | !! ! 02-11 (C. Talandier, A-M Treguier) Open boundaries |
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60 | !! 9.0 ! 04-03 (C. Ethe) passive tracers |
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61 | !!---------------------------------------------------------------------- |
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62 | !! * Arguments |
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63 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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64 | !! * Local declarations |
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65 | INTEGER :: ji, jj, jk,jn ! dummy loop indices |
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66 | REAL(wp) :: zfact, ztra ! temporary scalar |
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67 | !!---------------------------------------------------------------------- |
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68 | |
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69 | IF( kt == nittrc000 ) THEN |
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70 | WRITE(numout,*) |
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71 | WRITE(numout,*) 'trc_nxt : time stepping on passive tracers' |
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72 | ENDIF |
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73 | |
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74 | |
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75 | DO jn = 1, jptra |
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76 | |
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77 | ! 0. Lateral boundary conditions on tra (T-point, unchanged sign) |
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78 | ! ---------------------------------============ |
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79 | CALL lbc_lnk( tra(:,:,:,jn), 'T', 1. ) |
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80 | |
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81 | ! ! =============== |
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82 | DO jk = 1, jpk ! Horizontal slab |
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83 | ! ! =============== |
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84 | ! 1. Leap-frog scheme (only in explicit case, otherwise the |
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85 | ! ------------------- time stepping is already done in trczdf) |
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86 | IF( l_trczdf_exp .AND. ( ln_trcadv_cen2 .OR. ln_trcadv_tvd) ) THEN |
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87 | zfact = 2. * rdttra(jk) * FLOAT(ndttrc) |
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88 | IF( neuler == 0 .AND. kt == nittrc000 ) zfact = rdttra(jk) * FLOAT(ndttrc) |
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89 | tra(:,:,jk,jn) = ( trb(:,:,jk,jn) + zfact * tra(:,:,jk,jn) ) * tmask(:,:,jk) |
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90 | ENDIF |
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91 | |
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92 | END DO |
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93 | |
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94 | #if defined key_obc |
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95 | IF(lwp) WRITE(numout,cform_err) |
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96 | IF(lwp) WRITE(numout,*) ' Passive tracers and Open Boundary condition can not be used together ' |
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97 | IF(lwp) WRITE(numout,*) ' Check in trc_nxt routine' |
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98 | nstop = nstop + 1 |
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99 | #endif |
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100 | |
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101 | DO jk = 1, jpk |
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102 | |
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103 | ! 2. Time filter and swap of arrays |
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104 | ! --------------------------------- |
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105 | IF ( ln_trcadv_cen2 .OR. ln_trcadv_tvd ) THEN |
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106 | |
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107 | IF( neuler == 0 .AND. kt == nittrc000 ) THEN |
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108 | DO jj = 1, jpj |
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109 | DO ji = 1, jpi |
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110 | trb(ji,jj,jk,jn) = trn(ji,jj,jk,jn) |
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111 | trn(ji,jj,jk,jn) = tra(ji,jj,jk,jn) |
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112 | tra(ji,jj,jk,jn) = 0. |
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113 | END DO |
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114 | END DO |
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115 | ELSE |
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116 | DO jj = 1, jpj |
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117 | DO ji = 1, jpi |
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118 | trb(ji,jj,jk,jn) = atfp * ( trb(ji,jj,jk,jn) + tra(ji,jj,jk,jn) ) + atfp1 * trn(ji,jj,jk,jn) |
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119 | trn(ji,jj,jk,jn) = tra(ji,jj,jk,jn) |
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120 | tra(ji,jj,jk,jn) = 0. |
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121 | END DO |
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122 | END DO |
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123 | ENDIF |
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124 | |
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125 | ELSE |
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126 | ! case of smolar scheme or muscl |
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127 | DO jj = 1, jpj |
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128 | DO ji = 1, jpi |
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129 | trb(ji,jj,jk,jn) = tra(ji,jj,jk,jn) |
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130 | trn(ji,jj,jk,jn) = tra(ji,jj,jk,jn) |
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131 | tra(ji,jj,jk,jn) = 0. |
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132 | END DO |
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133 | END DO |
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134 | |
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135 | ENDIF |
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136 | ! ! =============== |
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137 | END DO ! End of slab |
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138 | ! ! =============== |
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139 | IF(l_ctl) THEN ! print mean field (used for debugging) |
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140 | ztra = SUM( trn(2:nictl,2:njctl,1:jpkm1,jn)*tmask(2:nictl,2:njctl,1:jpkm1) ) |
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141 | WRITE(numout,*) ' trc/nxt - ',ctrcnm(jn),' : ', ztra |
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142 | ENDIF |
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143 | |
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144 | END DO |
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145 | |
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146 | END SUBROUTINE trc_nxt |
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147 | |
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148 | #else |
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149 | !!---------------------------------------------------------------------- |
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150 | !! Default option Empty module |
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151 | !!---------------------------------------------------------------------- |
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152 | CONTAINS |
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153 | SUBROUTINE trc_nxt( kt ) |
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154 | INTEGER, INTENT(in) :: kt |
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155 | WRITE(*,*) 'trc_nxt: You should not have seen this print! error?', kt |
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156 | END SUBROUTINE trc_nxt |
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157 | #endif |
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158 | !!====================================================================== |
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159 | END MODULE trcnxt |
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