1 | MODULE traadv_cen2 |
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2 | !!============================================================================== |
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3 | !! *** MODULE traadv_cen2 *** |
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4 | !! Ocean active tracers: horizontal & vertical advective trend |
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5 | !!============================================================================== |
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6 | !! History : 8.2 ! 01-08 (G. Madec, E. Durand) trahad+trazad = traadv |
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7 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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8 | !! NEMO 1.0 ! 05-11 (V. Garnier) Surface pressure gradient organization |
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9 | !! - ! 05-11 (V. Garnier) Surface pressure gradient organization |
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10 | !! - ! 06-04 (R. Benshila, G. Madec) Step reorganization |
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11 | !! 2.4 ! 08-01 (G. Madec) Merge TRA-TRC |
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12 | !!---------------------------------------------------------------------- |
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13 | |
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14 | !!---------------------------------------------------------------------- |
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15 | !! tra_adv_cen2 : update the tracer trend with the horizontal and vertical |
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16 | !! advection trends using a 2nd order centered scheme |
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17 | !!---------------------------------------------------------------------- |
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18 | USE oce, ONLY: tn ! now ocean temperature |
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19 | USE dom_oce ! ocean space and time domain |
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20 | USE trdmod ! ocean active tracers trends |
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21 | USE trdmod_oce ! ocean variables trends |
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22 | USE flxrnf ! |
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23 | USE ocfzpt ! |
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24 | USE lib_mpp |
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25 | USE lbclnk ! ocean lateral boundary condition (or mpp link) |
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26 | USE in_out_manager ! I/O manager |
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27 | USE diaptr ! poleward transport diagnostics |
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28 | USE dynspg_oce ! choice/control of key cpp for surface pressure gradient |
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29 | USE prtctl ! Print control |
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30 | |
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31 | IMPLICIT NONE |
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32 | PRIVATE |
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33 | |
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34 | PUBLIC tra_adv_cen2 ! routine called by step.F90 |
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35 | |
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36 | REAL(wp), DIMENSION(jpi,jpj) :: btr2 ! inverse of T-point surface [1/(e1t*e2t)] |
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37 | |
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38 | !! * Substitutions |
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39 | # include "domzgr_substitute.h90" |
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40 | # include "vectopt_loop_substitute.h90" |
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41 | !!---------------------------------------------------------------------- |
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42 | !! NEMO/OPA 2.4 , LOCEAN-IPSL (2008) |
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43 | !! $Id:$ |
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44 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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45 | !!---------------------------------------------------------------------- |
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46 | |
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47 | CONTAINS |
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48 | |
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49 | SUBROUTINE tra_adv_cen2( kt, cdtype, ktra, pun, pvn, pwn, & |
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50 | & ptb, ptn, pta ) |
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51 | !!---------------------------------------------------------------------- |
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52 | !! *** ROUTINE tra_adv_cen2 *** |
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53 | !! |
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54 | !! ** Purpose : Compute the now trend due to the advection of a tracer |
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55 | !! and add it to the corresponding general trend of tracer equations. |
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56 | !! |
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57 | !! ** Method : The advection is evaluated by a second order centered |
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58 | !! scheme using now fields (leap-frog scheme). In specific areas |
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59 | !! (vicinity of major river mouths, some straits, or where tn is |
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60 | !! approaching the freezing point) it is mixed with an upstream |
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61 | !! scheme for stability reasons. |
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62 | !! Part 0 : compute the upstream / centered flag |
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63 | !! (3D array, zind, defined at T-point (0<zind<1)) |
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64 | !! Part I : horizontal advection |
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65 | !! * centered flux: |
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66 | !! zcenu = e2u*e3u un mi(ptn) |
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67 | !! zcenv = e1v*e3v vn mj(ptn) |
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68 | !! * upstream flux: |
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69 | !! zupsu = e2u*e3u un (ptb(i) or ptb(i-1) ) [un>0 or <0] |
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70 | !! zupsv = e1v*e3v vn (tb(j) or tb(j-1) ) [vn>0 or <0] |
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71 | !! * mixed upstream / centered horizontal advection scheme |
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72 | !! zcofi = max(zind(i+1), zind(i)) |
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73 | !! zcofj = max(zind(j+1), zind(j)) |
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74 | !! zwx = zcofi * zupsu + (1-zcofi) * zcenu |
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75 | !! zwy = zcofj * zupsv + (1-zcofj) * zcenv |
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76 | !! * horizontal advective trend (divergence of the fluxes) |
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77 | !! zta = 1/(e1t*e2t*e3t) { di-1[zwx] + dj-1[zwy] } |
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78 | !! * Add this trend now to the general trend of tracer (pta): |
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79 | !! pta = pta + zta |
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80 | !! * trend diagnostic (lk_trdtra=T): the trend is |
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81 | !! saved for diagnostics. The trends saved is expressed as |
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82 | !! Uh.gradh(T), i.e. |
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83 | !! save trend = zta + ptn divn |
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84 | !! In addition, the advective trend in the two horizontal direc- |
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85 | !! tion is also re-computed as Uh gradh(T). Indeed hadt+ptn divn is |
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86 | !! equal to (in s-coordinates, and similarly in z-coord.): |
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87 | !! zta+ptn*divn=1/(e1t*e2t*e3t) { mi-1( e2u*e3u un di[ptn] ) |
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88 | !! +mj-1( e1v*e3v vn mj[ptn] ) } |
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89 | !! NB:in z-coordinate - full step (ln_zco=T) e3u=e3v=e3t, so |
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90 | !! they vanish from the expression of the flux and divergence. |
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91 | !! |
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92 | !! Part II : vertical advection |
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93 | !! the advective trend is computed as follows : |
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94 | !! zta = 1/e3t dk+1[ zwx ] |
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95 | !! where the vertical advective flux, zwx, is given by : |
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96 | !! zwx = zcofk * zupst + (1-zcofk) * zcent |
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97 | !! with |
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98 | !! zupsv = upstream flux = wn * (tb(k) or tb(k-1) ) [wn>0 or <0] |
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99 | !! zcenu = centered flux = wn * mk(ptn) |
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100 | !! The surface boundary condition is : |
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101 | !! rigid-lid (lk_dynspg_frd = T) : zero advective flux |
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102 | !! free-surf (lk_dynspg_fsc = T) : wn(:,:,1) * ptn(:,:,1) |
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103 | !! Add this trend now to the general trend of tracer (ta,sa): |
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104 | !! (ta,sa) = (ta,sa) + ( zta , zsa ) |
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105 | !! Trend diagnostic ('key_trdtra' defined): the trend is |
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106 | !! saved for diagnostics. The trends saved is expressed as : |
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107 | !! save trend = w.gradz(T) = zta - ptn divn. |
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108 | !! |
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109 | !! ** Action : - update (ta,sa) with the now advective tracer trends |
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110 | !! - trend diagnostics (lk_trdtra=T) |
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111 | !!---------------------------------------------------------------------- |
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112 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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113 | CHARACTER(len=3), INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator) |
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114 | INTEGER , INTENT(in ) :: ktra ! tracer index |
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115 | REAL(wp) , INTENT(in ), DIMENSION(jpi,jpj,jpk) :: pun, pvn, pwn ! 3 ocean velocity components |
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116 | REAL(wp) , INTENT(in ), DIMENSION(jpi,jpj,jpk) :: ptb, ptn ! before and now tracer fields |
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117 | REAL(wp) , INTENT(inout), DIMENSION(jpi,jpj,jpk) :: pta ! tracer trend |
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118 | !! |
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119 | INTEGER :: ji, jj, jk ! dummy loop indices |
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120 | REAL(wp) :: zbtr, zta, zhw, ze3tr ! temporary scalars |
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121 | REAL(wp) :: zcofi, zfui, zcenut, zupsut, zfp_ui, zfm_ui ! " " |
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122 | REAL(wp) :: zcofj, zfvj, zcenvt, zupsvt, zfp_vj, zfm_vj ! " " |
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123 | REAL(wp) :: zcofk, zcent , zupst , zfp_w , zfm_w ! " " |
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124 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zwx, zwy, zind ! 3D workspace |
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125 | !!---------------------------------------------------------------------- |
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126 | |
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127 | IF( kt == nit000 ) THEN |
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128 | IF(lwp) WRITE(numout,*) |
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129 | IF(lwp) WRITE(numout,*) 'tra_adv_cen2 : 2nd order centered advection scheme' |
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130 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~' |
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131 | ! |
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132 | btr2(:,:) = 1. / ( e1t(:,:) * e2t(:,:) ) |
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133 | ENDIF |
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134 | |
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135 | ! Upstream / centered scheme indicator |
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136 | ! ------------------------------------ |
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137 | DO jk = 1, jpk |
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138 | DO jj = 1, jpj |
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139 | DO ji = 1, jpi |
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140 | zind(ji,jj,jk) = MAX ( upsrnfh(ji,jj) * upsrnfz(jk), & ! changing advection scheme near runoff |
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141 | & upsadv(ji,jj) & ! in the vicinity of some straits |
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142 | #if defined key_ice_lim |
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143 | & , tmask(ji,jj,jk) & ! half upstream tracer fluxes |
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144 | & * MAX( 0., SIGN( 1., fzptn(ji,jj) & ! if tn < ("freezing"+0.1 ) |
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145 | & +0.1-tn(ji,jj,jk) ) ) & |
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146 | #endif |
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147 | & ) |
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148 | END DO |
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149 | END DO |
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150 | END DO |
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151 | |
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152 | ! I. Horizontal advection |
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153 | ! ----------------------- |
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154 | |
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155 | ! ! =============== |
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156 | DO jk = 1, jpkm1 ! Horizontal slab |
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157 | ! ! =============== |
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158 | ! |
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159 | DO jj = 1, jpjm1 ! Horizontal advective fluxes |
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160 | DO ji = 1, fs_jpim1 ! vector opt. |
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161 | ! upstream indicator |
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162 | zcofi = MAX( zind(ji+1,jj,jk), zind(ji,jj,jk) ) |
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163 | zcofj = MAX( zind(ji,jj+1,jk), zind(ji,jj,jk) ) |
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164 | ! volume fluxes * 1/2 |
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165 | #if defined key_zco |
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166 | zfui = 0.5 * e2u(ji,jj) * pun(ji,jj,jk) |
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167 | zfvj = 0.5 * e1v(ji,jj) * pvn(ji,jj,jk) |
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168 | #else |
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169 | zfui = 0.5 * e2u(ji,jj) * fse3u(ji,jj,jk) * pun(ji,jj,jk) |
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170 | zfvj = 0.5 * e1v(ji,jj) * fse3v(ji,jj,jk) * pvn(ji,jj,jk) |
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171 | #endif |
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172 | ! upstream scheme |
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173 | zfp_ui = zfui + ABS( zfui ) |
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174 | zfp_vj = zfvj + ABS( zfvj ) |
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175 | zfm_ui = zfui - ABS( zfui ) |
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176 | zfm_vj = zfvj - ABS( zfvj ) |
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177 | zupsut = zfp_ui * ptb(ji,jj,jk) + zfm_ui * ptb(ji+1,jj ,jk) |
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178 | zupsvt = zfp_vj * ptb(ji,jj,jk) + zfm_vj * ptb(ji ,jj+1,jk) |
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179 | ! centered scheme |
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180 | zcenut = zfui * ( ptn(ji,jj,jk) + ptn(ji+1,jj ,jk) ) |
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181 | zcenvt = zfvj * ( ptn(ji,jj,jk) + ptn(ji ,jj+1,jk) ) |
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182 | ! mixed centered / upstream scheme |
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183 | zwx(ji,jj,jk) = zcofi * zupsut + (1.-zcofi) * zcenut |
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184 | zwy(ji,jj,jk) = zcofj * zupsvt + (1.-zcofj) * zcenvt |
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185 | END DO |
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186 | END DO |
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187 | |
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188 | DO jj = 2, jpjm1 ! horizontal tracer flux divergence added to the general trend |
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189 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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190 | #if defined key_zco |
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191 | zbtr = btr2(ji,jj) |
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192 | #else |
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193 | zbtr = btr2(ji,jj) / fse3t(ji,jj,jk) |
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194 | #endif |
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195 | ! horizontal advective trends |
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196 | zta = - zbtr * ( zwx(ji,jj,jk) - zwx(ji-1,jj ,jk) & |
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197 | & + zwy(ji,jj,jk) - zwy(ji ,jj-1,jk) ) |
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198 | ! add it to the general tracer trends |
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199 | pta(ji,jj,jk) = pta(ji,jj,jk) + zta |
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200 | END DO |
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201 | END DO |
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202 | ! ! =============== |
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203 | END DO ! End of slab |
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204 | ! ! =============== |
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205 | |
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206 | ! Save the horizontal advective trends for diagnostic |
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207 | ! ----------------------------------------------------- |
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208 | IF( l_trdtra ) THEN |
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209 | CALL trd_tra_adv( kt, ktra, jpt_trd_xad, cdtype, zwx, pun, ptn ) |
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210 | CALL trd_tra_adv( kt, ktra, jpt_trd_yad, cdtype, zwy, pvn, ptn ) |
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211 | ENDIF |
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212 | |
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213 | IF(ln_ctl) CALL prt_ctl( tab3d_1=pta, clinfo1=' cen2 - had: ', mask1=tmask, clinfo3=cdtype ) |
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214 | |
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215 | |
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216 | ! "Poleward" heat and salt transport |
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217 | ! ---------------------------------- |
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218 | IF( cdtype == 'TRA' .AND. ln_diaptr .AND. ( MOD( kt, nf_ptr ) == 0 ) ) THEN |
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219 | IF( lk_zco ) THEN |
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220 | DO jk = 1, jpkm1 |
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221 | DO jj = 2, jpjm1 |
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222 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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223 | zwy(ji,jj,jk) = zwy(ji,jj,jk) * fse3v(ji,jj,jk) |
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224 | END DO |
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225 | END DO |
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226 | END DO |
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227 | ENDIF |
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228 | IF( ktra == jp_tem) pht_adv(:) = ptr_vj( zwy(:,:,:) ) |
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229 | IF( ktra == jp_sal) pst_adv(:) = ptr_vj( zwy(:,:,:) ) |
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230 | ENDIF |
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231 | |
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232 | |
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233 | ! II. Vertical advection |
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234 | ! ---------------------- |
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235 | |
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236 | IF( lk_dynspg_rl .OR. lk_vvl ) THEN ! rigid lid or non-linear free surface |
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237 | zwx(:,:, 1 ) = 0.e0 ! Surface value : zero flux |
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238 | zwx(:,:,jpk) = 0.e0 ! Bottom value : flux set to zero |
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239 | ELSE ! linear free surface |
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240 | zwx(:,:, 1 ) = pwn(:,:,1) * ptn(:,:,1) ! Surface : : advection through z=0 |
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241 | zwx(:,:,jpk) = 0.e0 ! Bottom : flux set to zero |
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242 | ENDIF |
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243 | |
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244 | DO jk = 2, jpk ! Vertical advective fluxes (at w-point) |
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245 | DO jj = 2, jpjm1 |
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246 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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247 | ! upstream indicator |
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248 | zcofk = MAX( zind(ji,jj,jk-1), zind(ji,jj,jk) ) |
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249 | ! velocity * 1/2 |
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250 | zhw = 0.5 * pwn(ji,jj,jk) |
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251 | ! upstream scheme |
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252 | zfp_w = zhw + ABS( zhw ) |
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253 | zfm_w = zhw - ABS( zhw ) |
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254 | zupst = zfp_w * ptb(ji,jj,jk) + zfm_w * ptb(ji,jj,jk-1) |
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255 | ! centered scheme |
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256 | zcent = zhw * ( ptn(ji,jj,jk) + ptn(ji,jj,jk-1) ) |
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257 | ! mixed centered / upstream scheme |
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258 | zwx(ji,jj,jk) = zcofk * zupst + (1.-zcofk) * zcent |
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259 | END DO |
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260 | END DO |
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261 | END DO |
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262 | |
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263 | DO jk = 1, jpkm1 ! Tracer flux divergence at t-point added to the general trend |
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264 | DO jj = 2, jpjm1 |
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265 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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266 | ze3tr = 1. / fse3t(ji,jj,jk) |
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267 | ! vertical advective trends |
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268 | zta = - ze3tr * ( zwx(ji,jj,jk) - zwx(ji,jj,jk+1) ) |
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269 | ! add it to the general tracer trends |
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270 | pta(ji,jj,jk) = pta(ji,jj,jk) + zta |
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271 | END DO |
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272 | END DO |
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273 | END DO |
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274 | |
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275 | ! 3. Save the vertical advective trends for diagnostic |
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276 | ! ---------------------------------------------------- |
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277 | IF( l_trdtra ) CALL trd_tra_adv( kt, ktra, jpt_trd_zad, cdtype, zwx, pwn, ptn ) |
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278 | |
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279 | IF(ln_ctl) CALL prt_ctl( tab3d_1=pta, clinfo1=' cen2 - zad : ', mask1=tmask, clinfo3=cdtype ) |
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280 | ! |
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281 | END SUBROUTINE tra_adv_cen2 |
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282 | |
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283 | !!====================================================================== |
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284 | END MODULE traadv_cen2 |
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