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 | !! History : 7.0 ! 1991-11 (G. Madec) Original code |
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7 | !! ! 1993-03 (M. Guyon) symetrical conditions |
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8 | !! ! 1995-02 (M. Levy) passive tracers |
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9 | !! ! 1996-02 (G. Madec & M. Imbard) opa release 8.0 |
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10 | !! 8.0 ! 1996-04 (A. Weaver) Euler forward step |
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11 | !! 8.2 ! 1999-02 (G. Madec, N. Grima) semi-implicit pressure grad. |
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12 | !! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and module |
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13 | !! ! 2002-08 (G. Madec) F90: Free form and module |
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14 | !! ! 2002-11 (C. Talandier, A-M Treguier) Open boundaries |
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15 | !! ! 2004-03 (C. Ethe) passive tracers |
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16 | !! ! 2007-02 (C. Deltel) Diagnose ML trends for passive tracers |
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17 | !! 2.0 ! 2006-02 (L. Debreu, C. Mazauric) Agrif implementation |
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18 | !! 3.0 ! 2008-06 (G. Madec) time stepping always done in trazdf |
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19 | !! 3.1 ! 2009-02 (G. Madec, R. Benshila) re-introduce the vvl option |
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20 | !! 3.3 ! 2010-06 (C. Ethe, G. Madec) Merge TRA-TRC |
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21 | !!---------------------------------------------------------------------- |
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22 | #if defined key_top |
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23 | !!---------------------------------------------------------------------- |
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24 | !! 'key_top' TOP models |
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25 | !!---------------------------------------------------------------------- |
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26 | !! trc_nxt : time stepping on passive tracers |
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27 | !!---------------------------------------------------------------------- |
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28 | USE oce_trc ! ocean dynamics and tracers variables |
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29 | USE trc ! ocean passive tracers variables |
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30 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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31 | USE prtctl_trc ! Print control for debbuging |
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32 | USE trd_oce |
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33 | USE trdtra |
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34 | USE tranxt |
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35 | # if defined key_agrif |
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36 | USE agrif_top_interp |
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37 | # endif |
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38 | |
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39 | IMPLICIT NONE |
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40 | PRIVATE |
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41 | |
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42 | PUBLIC trc_nxt ! routine called by step.F90 |
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43 | PUBLIC trc_nxt_alloc ! routine called by nemogcm.F90 |
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44 | |
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45 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:) :: r2dt |
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46 | |
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47 | !!---------------------------------------------------------------------- |
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48 | !! NEMO/TOP 3.3 , NEMO Consortium (2010) |
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49 | !! $Id$ |
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50 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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51 | !!---------------------------------------------------------------------- |
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52 | CONTAINS |
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53 | |
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54 | INTEGER FUNCTION trc_nxt_alloc() |
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55 | !!---------------------------------------------------------------------- |
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56 | !! *** ROUTINE trc_nxt_alloc *** |
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57 | !!---------------------------------------------------------------------- |
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58 | ALLOCATE( r2dt(jpk), STAT=trc_nxt_alloc ) |
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59 | ! |
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60 | IF( trc_nxt_alloc /= 0 ) CALL ctl_warn('trc_nxt_alloc : failed to allocate array') |
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61 | ! |
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62 | END FUNCTION trc_nxt_alloc |
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63 | |
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64 | |
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65 | SUBROUTINE trc_nxt( kt ) |
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66 | !!---------------------------------------------------------------------- |
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67 | !! *** ROUTINE trcnxt *** |
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68 | !! |
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69 | !! ** Purpose : Compute the passive tracers fields at the |
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70 | !! next time-step from their temporal trends and swap the fields. |
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71 | !! |
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72 | !! ** Method : Apply lateral boundary conditions on (ua,va) through |
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73 | !! call to lbc_lnk routine |
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74 | !! default: |
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75 | !! arrays swap |
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76 | !! (trn) = (tra) ; (tra) = (0,0) |
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77 | !! (trb) = (trn) |
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78 | !! |
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79 | !! For Arakawa or TVD Scheme : |
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80 | !! A Asselin time filter applied on now tracers (trn) to avoid |
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81 | !! the divergence of two consecutive time-steps and tr arrays |
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82 | !! to prepare the next time_step: |
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83 | !! (trb) = (trn) + atfp [ (trb) + (tra) - 2 (trn) ] |
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84 | !! (trn) = (tra) ; (tra) = (0,0) |
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85 | !! |
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86 | !! |
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87 | !! ** Action : - update trb, trn |
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88 | !!---------------------------------------------------------------------- |
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89 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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90 | ! |
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91 | INTEGER :: jk, jn ! dummy loop indices |
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92 | REAL(wp) :: zfact ! temporary scalar |
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93 | CHARACTER (len=22) :: charout |
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94 | REAL(wp), POINTER, DIMENSION(:,:,:,:) :: ztrdt |
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95 | !!---------------------------------------------------------------------- |
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96 | ! |
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97 | IF( nn_timing == 1 ) CALL timing_start('trc_nxt') |
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98 | ! |
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99 | IF( kt == nittrc000 .AND. lwp ) THEN |
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100 | WRITE(numout,*) |
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101 | WRITE(numout,*) 'trc_nxt : time stepping on passive tracers' |
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102 | ENDIF |
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103 | |
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104 | ! Update after tracer on domain lateral boundaries |
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105 | DO jn = 1, jptra |
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106 | CALL lbc_lnk( tra(:,:,:,jn), 'T', 1. ) |
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107 | END DO |
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108 | |
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109 | |
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110 | #if defined key_bdy |
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111 | !! CALL bdy_trc( kt ) ! BDY open boundaries |
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112 | #endif |
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113 | #if defined key_agrif |
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114 | CALL Agrif_trc ! AGRIF zoom boundaries |
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115 | #endif |
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116 | |
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117 | |
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118 | ! set time step size (Euler/Leapfrog) |
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119 | IF( neuler == 0 .AND. kt == nittrc000 ) THEN ; r2dt(:) = rdttrc(:) ! at nittrc000 (Euler) |
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120 | ELSEIF( kt <= nittrc000 + nn_dttrc ) THEN ; r2dt(:) = 2.* rdttrc(:) ! at nit000 or nit000+1 (Leapfrog) |
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121 | ENDIF |
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122 | |
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123 | ! trends computation initialisation |
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124 | IF( l_trdtrc ) THEN |
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125 | CALL wrk_alloc( jpi, jpj, jpk, jptra, ztrdt ) !* store now fields before applying the Asselin filter |
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126 | ztrdt(:,:,:,:) = trn(:,:,:,:) |
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127 | ENDIF |
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128 | ! Leap-Frog + Asselin filter time stepping |
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129 | IF( neuler == 0 .AND. kt == nittrc000 ) THEN ! Euler time-stepping at first time-step |
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130 | ! ! (only swap) |
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131 | DO jn = 1, jptra |
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132 | DO jk = 1, jpkm1 |
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133 | trn(:,:,jk,jn) = tra(:,:,jk,jn) |
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134 | END DO |
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135 | END DO |
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136 | ! |
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137 | ELSE |
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138 | ! Leap-Frog + Asselin filter time stepping |
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139 | IF( lk_vvl ) THEN ; CALL tra_nxt_vvl( kt, nittrc000, rdttrc, 'TRC', trb, trn, tra, & |
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140 | & sbc_trc, sbc_trc_b, jptra ) ! variable volume level (vvl) |
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141 | ELSE ; CALL tra_nxt_fix( kt, nittrc000, 'TRC', trb, trn, tra, jptra ) ! fixed volume level |
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142 | ENDIF |
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143 | ENDIF |
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144 | |
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145 | ! trends computation |
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146 | IF( l_trdtrc ) THEN ! trends |
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147 | DO jn = 1, jptra |
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148 | DO jk = 1, jpkm1 |
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149 | zfact = 1.e0 / r2dt(jk) |
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150 | ztrdt(:,:,jk,jn) = ( trb(:,:,jk,jn) - ztrdt(:,:,jk,jn) ) * zfact |
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151 | CALL trd_tra( kt, 'TRC', jn, jptra_atf, ztrdt ) |
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152 | END DO |
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153 | END DO |
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154 | CALL wrk_dealloc( jpi, jpj, jpk, jptra, ztrdt ) |
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155 | END IF |
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156 | ! |
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157 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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158 | WRITE(charout, FMT="('nxt')") |
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159 | CALL prt_ctl_trc_info(charout) |
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160 | CALL prt_ctl_trc(tab4d=trn, mask=tmask, clinfo=ctrcnm) |
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161 | ENDIF |
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162 | ! |
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163 | IF( nn_timing == 1 ) CALL timing_stop('trc_nxt') |
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164 | ! |
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165 | END SUBROUTINE trc_nxt |
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166 | |
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167 | #else |
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168 | !!---------------------------------------------------------------------- |
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169 | !! Default option Empty module |
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170 | !!---------------------------------------------------------------------- |
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171 | CONTAINS |
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172 | SUBROUTINE trc_nxt( kt ) |
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173 | INTEGER, INTENT(in) :: kt |
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174 | WRITE(*,*) 'trc_nxt: You should not have seen this print! error?', kt |
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175 | END SUBROUTINE trc_nxt |
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176 | #endif |
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177 | !!====================================================================== |
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178 | END MODULE trcnxt |
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