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 domvvl ! variable volume |
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30 | USE trc ! ocean passive tracers variables |
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31 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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32 | USE prtctl_trc ! Print control for debbuging |
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33 | USE trcnam_trp ! passive tracers transport namelist variables |
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34 | USE trd_oce |
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35 | USE trdtra |
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36 | USE tranxt |
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37 | # if defined key_agrif |
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38 | USE agrif_top_interp |
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39 | # endif |
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40 | |
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41 | IMPLICIT NONE |
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42 | PRIVATE |
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43 | |
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44 | PUBLIC trc_nxt ! routine called by step.F90 |
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45 | PUBLIC trc_nxt_alloc ! routine called by nemogcm.F90 |
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46 | |
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47 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:) :: r2dt |
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48 | REAL(wp) :: rfact1, rfact2 |
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49 | |
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50 | !! * Substitutions |
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51 | # include "domzgr_substitute.h90" |
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52 | # include "vectopt_loop_substitute.h90" |
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53 | !!---------------------------------------------------------------------- |
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54 | !! NEMO/TOP 3.3 , NEMO Consortium (2010) |
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55 | !! $Id$ |
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56 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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57 | !!---------------------------------------------------------------------- |
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58 | |
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59 | CONTAINS |
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60 | |
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61 | INTEGER FUNCTION trc_nxt_alloc() |
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62 | !!---------------------------------------------------------------------- |
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63 | !! *** ROUTINE trc_nxt_alloc *** |
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64 | !!---------------------------------------------------------------------- |
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65 | ALLOCATE( r2dt(jpk), STAT=trc_nxt_alloc ) |
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66 | ! |
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67 | IF( trc_nxt_alloc /= 0 ) CALL ctl_warn('trc_nxt_alloc : failed to allocate array') |
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68 | ! |
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69 | END FUNCTION trc_nxt_alloc |
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70 | |
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71 | |
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72 | SUBROUTINE trc_nxt( kt ) |
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73 | !!---------------------------------------------------------------------- |
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74 | !! *** ROUTINE trcnxt *** |
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75 | !! |
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76 | !! ** Purpose : Compute the passive tracers fields at the |
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77 | !! next time-step from their temporal trends and swap the fields. |
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78 | !! |
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79 | !! ** Method : Apply lateral boundary conditions on (ua,va) through |
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80 | !! call to lbc_lnk routine |
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81 | !! default: |
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82 | !! arrays swap |
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83 | !! (trn) = (tra) ; (tra) = (0,0) |
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84 | !! (trb) = (trn) |
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85 | !! |
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86 | !! For Arakawa or TVD Scheme : |
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87 | !! A Asselin time filter applied on now tracers (trn) to avoid |
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88 | !! the divergence of two consecutive time-steps and tr arrays |
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89 | !! to prepare the next time_step: |
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90 | !! (trb) = (trn) + atfp [ (trb) + (tra) - 2 (trn) ] |
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91 | !! (trn) = (tra) ; (tra) = (0,0) |
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92 | !! |
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93 | !! |
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94 | !! ** Action : - update trb, trn |
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95 | !!---------------------------------------------------------------------- |
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96 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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97 | ! |
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98 | INTEGER :: jk, jn ! dummy loop indices |
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99 | REAL(wp) :: zfact ! temporary scalar |
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100 | CHARACTER (len=22) :: charout |
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101 | REAL(wp), POINTER, DIMENSION(:,:,:,:) :: ztrdt |
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102 | !!---------------------------------------------------------------------- |
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103 | ! |
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104 | IF( nn_timing == 1 ) CALL timing_start('trc_nxt') |
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105 | ! |
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106 | IF( kt == nittrc000 .AND. lwp ) THEN |
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107 | WRITE(numout,*) |
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108 | WRITE(numout,*) 'trc_nxt : time stepping on passive tracers' |
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109 | ENDIF |
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110 | |
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111 | #if defined key_agrif |
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112 | CALL Agrif_trc ! AGRIF zoom boundaries |
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113 | #endif |
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114 | ! Update after tracer on domain lateral boundaries |
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115 | DO jn = 1, jptra |
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116 | CALL lbc_lnk( tra(:,:,:,jn), 'T', 1. ) |
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117 | END DO |
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118 | |
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119 | |
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120 | #if defined key_bdy |
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121 | !! CALL bdy_trc( kt ) ! BDY open boundaries |
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122 | #endif |
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123 | |
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124 | |
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125 | ! set time step size (Euler/Leapfrog) |
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126 | IF( (neuler == 0 .AND. kt == nittrc000) .OR. ln_top_euler ) THEN ; r2dt(:) = rdttrc(:) ! (Euler) |
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127 | ELSEIF( kt <= nittrc000 + nn_dttrc ) THEN ; r2dt(:) = 2.* rdttrc(:) ! at nit000 or nit000+1 (Leapfrog) |
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128 | ENDIF |
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129 | |
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130 | ! trends computation initialisation |
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131 | IF( l_trdtrc ) THEN |
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132 | CALL wrk_alloc( jpi, jpj, jpk, jptra, ztrdt ) !* store now fields before applying the Asselin filter |
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133 | ztrdt(:,:,jpk,:) = 0._wp |
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134 | IF( ln_trcldf_iso ) THEN ! diagnose the "pure" Kz diffusive trend |
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135 | DO jn = 1, jptra |
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136 | CALL trd_tra( kt, 'TRC', jn, jptra_zdfp, ztrdt(:,:,:,jn) ) |
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137 | ENDDO |
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138 | ENDIF |
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139 | ! total trend for the non-time-filtered variables. |
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140 | ! G Nurser 23 Mar 2017. Recalculate trend as Delta(e3t*T)/e3tn; e3tn |
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141 | ! cancel from tsn terms |
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142 | IF( lk_vvl ) THEN |
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143 | DO jn = 1, jptra |
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144 | DO jk = 1, jpkm1 |
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145 | zfact = 1.0 / rdttrc(jk) |
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146 | ztrdt(:,:,jk,jn) = ( tra(:,:,jk,jn)*fse3t_a(:,:,jk) / fse3t_n(:,:,jk) - & |
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147 | trn(:,:,jk,jn) ) * zfact |
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148 | END DO |
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149 | END DO |
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150 | ELSE |
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151 | DO jn = 1, jptra |
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152 | DO jk = 1, jpkm1 |
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153 | zfact = 1.0 / rdttrc(jk) |
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154 | ztrdt(:,:,jk,jn) = ( tra(:,:,jk,jn) - trn(:,:,jk,jn) ) * zfact |
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155 | END DO |
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156 | END DO |
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157 | END IF |
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158 | DO jn = 1, jptra |
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159 | CALL trd_tra( kt, 'TRC', jn, jptra_tot, ztrdt(:,:,:,jn) ) |
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160 | ENDDO |
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161 | IF( .NOT.lk_vvl ) THEN |
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162 | ! Store now fields before applying the Asselin filter |
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163 | ! in order to calculate Asselin filter trend later. |
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164 | ztrdt(:,:,:,:) = trn(:,:,:,:) |
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165 | ENDIF |
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166 | ENDIF |
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167 | ! Leap-Frog + Asselin filter time stepping |
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168 | IF( (neuler == 0 .AND. kt == nittrc000) .OR. ln_top_euler ) THEN ! Euler time-stepping (only swap) |
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169 | ! ! (only swap) |
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170 | DO jn = 1, jptra |
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171 | DO jk = 1, jpkm1 |
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172 | trn(:,:,jk,jn) = tra(:,:,jk,jn) |
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173 | END DO |
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174 | END DO |
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175 | IF (l_trdtrc.AND.lk_vvl) THEN ! Zero Asselin filter contribution |
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176 | ! must be explicitly written out since for vvl |
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177 | ! Asselin filter is output by |
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178 | ! tra_nxt_vvl that is not called on |
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179 | ! this time step |
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180 | ztrdt(:,:,:,:) = 0._wp |
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181 | DO jn = 1, jptra |
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182 | CALL trd_tra( kt, 'TRC', jn, jptra_atf, ztrdt(:,:,:,jn) ) |
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183 | ENDDO |
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184 | END IF |
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185 | |
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186 | ! |
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187 | ELSE |
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188 | IF( .NOT. lk_offline ) THEN ! Leap-Frog + Asselin filter time stepping |
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189 | IF( lk_vvl ) THEN ; CALL tra_nxt_vvl( kt, nittrc000, rdttrc, 'TRC', trb, trn, tra, & |
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190 | & sbc_trc, sbc_trc_b, jptra ) ! variable volume level (vvl) |
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191 | ELSE ; CALL tra_nxt_fix( kt, nittrc000, 'TRC', trb, trn, tra, jptra ) ! fixed volume level |
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192 | ENDIF |
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193 | ELSE |
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194 | CALL trc_nxt_off( kt ) ! offline |
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195 | ENDIF |
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196 | ENDIF |
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197 | |
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198 | ! trends computation |
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199 | IF( l_trdtrc.AND..NOT.lk_vvl) THEN ! trends |
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200 | DO jn = 1, jptra |
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201 | DO jk = 1, jpkm1 |
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202 | zfact = 1.e0 / r2dt(jk) |
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203 | ztrdt(:,:,jk,jn) = ( trb(:,:,jk,jn) - ztrdt(:,:,jk,jn) ) * zfact |
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204 | END DO |
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205 | CALL trd_tra( kt, 'TRC', jn, jptra_atf, ztrdt(:,:,:,jn) ) |
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206 | END DO |
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207 | END IF |
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208 | ! |
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209 | IF( l_trdtrc) CALL wrk_dealloc( jpi, jpj, jpk, jptra, ztrdt ) |
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210 | ! |
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211 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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212 | WRITE(charout, FMT="('nxt')") |
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213 | CALL prt_ctl_trc_info(charout) |
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214 | CALL prt_ctl_trc(tab4d=trn, mask=tmask, clinfo=ctrcnm) |
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215 | ENDIF |
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216 | ! |
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217 | IF( nn_timing == 1 ) CALL timing_stop('trc_nxt') |
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218 | ! |
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219 | END SUBROUTINE trc_nxt |
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220 | |
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221 | SUBROUTINE trc_nxt_off( kt ) |
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222 | !!---------------------------------------------------------------------- |
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223 | !! *** ROUTINE tra_nxt_vvl *** |
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224 | !! |
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225 | !! ** Purpose : Time varying volume: apply the Asselin time filter |
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226 | !! and swap the tracer fields. |
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227 | !! |
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228 | !! ** Method : - Apply a thickness weighted Asselin time filter on now fields. |
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229 | !! - save in (ta,sa) a thickness weighted average over the three |
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230 | !! time levels which will be used to compute rdn and thus the semi- |
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231 | !! implicit hydrostatic pressure gradient (ln_dynhpg_imp = T) |
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232 | !! - swap tracer fields to prepare the next time_step. |
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233 | !! This can be summurized for tempearture as: |
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234 | !! ztm = ( e3t_n*tn + rbcp*[ e3t_b*tb - 2 e3t_n*tn + e3t_a*ta ] ) ln_dynhpg_imp = T |
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235 | !! /( e3t_n + rbcp*[ e3t_b - 2 e3t_n + e3t_a ] ) |
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236 | !! ztm = 0 otherwise |
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237 | !! tb = ( e3t_n*tn + atfp*[ e3t_b*tb - 2 e3t_n*tn + e3t_a*ta ] ) |
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238 | !! /( e3t_n + atfp*[ e3t_b - 2 e3t_n + e3t_a ] ) |
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239 | !! tn = ta |
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240 | !! ta = zt (NB: reset to 0 after eos_bn2 call) |
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241 | !! |
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242 | !! ** Action : - (tb,sb) and (tn,sn) ready for the next time step |
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243 | !! - (ta,sa) time averaged (t,s) (ln_dynhpg_imp = T) |
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244 | !!---------------------------------------------------------------------- |
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245 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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246 | !! |
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247 | INTEGER :: ji, jj, jk, jn ! dummy loop indices |
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248 | REAL(wp) :: ztc_a , ztc_n , ztc_b , ztc_f , ztc_d ! local scalar |
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249 | REAL(wp) :: ze3t_b, ze3t_n, ze3t_a, ze3t_f, ze3t_d ! - - |
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250 | !!---------------------------------------------------------------------- |
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251 | ! |
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252 | IF( kt == nittrc000 ) THEN |
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253 | IF(lwp) WRITE(numout,*) |
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254 | IF(lwp) WRITE(numout,*) 'trc_nxt_off : time stepping' |
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255 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' |
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256 | IF( lk_vvl ) THEN |
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257 | rfact1 = atfp * rdttrc(1) |
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258 | rfact2 = rfact1 / rau0 |
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259 | ENDIF |
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260 | ENDIF |
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261 | ! |
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262 | DO jn = 1, jptra |
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263 | DO jk = 1, jpkm1 |
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264 | DO jj = 1, jpj |
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265 | DO ji = 1, jpi |
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266 | ze3t_b = fse3t_b(ji,jj,jk) |
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267 | ze3t_n = fse3t_n(ji,jj,jk) |
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268 | ze3t_a = fse3t_a(ji,jj,jk) |
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269 | ! ! tracer content at Before, now and after |
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270 | ztc_b = trb(ji,jj,jk,jn) * ze3t_b |
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271 | ztc_n = trn(ji,jj,jk,jn) * ze3t_n |
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272 | ztc_a = tra(ji,jj,jk,jn) * ze3t_a |
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273 | ! |
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274 | ze3t_d = ze3t_a - 2. * ze3t_n + ze3t_b |
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275 | ztc_d = ztc_a - 2. * ztc_n + ztc_b |
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276 | ! |
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277 | ze3t_f = ze3t_n + atfp * ze3t_d |
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278 | ztc_f = ztc_n + atfp * ztc_d |
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279 | ! |
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280 | IF( lk_vvl .AND. jk == mikt(ji,jj) ) THEN ! first level |
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281 | ze3t_f = ze3t_f - rfact2 * ( emp_b(ji,jj) - emp(ji,jj) ) |
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282 | ztc_f = ztc_f - rfact1 * ( sbc_trc(ji,jj,jn) - sbc_trc_b(ji,jj,jn) ) |
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283 | ENDIF |
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284 | |
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285 | ze3t_f = 1.e0 / ze3t_f |
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286 | trb(ji,jj,jk,jn) = ztc_f * ze3t_f ! ptb <-- ptn filtered |
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287 | trn(ji,jj,jk,jn) = tra(ji,jj,jk,jn) ! ptn <-- pta |
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288 | ! |
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289 | END DO |
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290 | END DO |
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291 | END DO |
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292 | ! |
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293 | END DO |
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294 | ! |
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295 | END SUBROUTINE trc_nxt_off |
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296 | #else |
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297 | !!---------------------------------------------------------------------- |
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298 | !! Default option Empty module |
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299 | !!---------------------------------------------------------------------- |
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300 | CONTAINS |
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301 | SUBROUTINE trc_nxt( kt ) |
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302 | INTEGER, INTENT(in) :: kt |
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303 | WRITE(*,*) 'trc_nxt: You should not have seen this print! error?', kt |
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304 | END SUBROUTINE trc_nxt |
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305 | #endif |
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306 | !!====================================================================== |
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307 | END MODULE trcnxt |
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