1 | MODULE zdfevd |
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2 | !!====================================================================== |
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3 | !! *** MODULE zdfevd *** |
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4 | !! Ocean physics: parameterization of convection through an enhancement |
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5 | !! of vertical eddy mixing coefficient |
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6 | !!====================================================================== |
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7 | |
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8 | !!---------------------------------------------------------------------- |
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9 | !! zdf_evd : update momentum and tracer Kz at the location of |
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10 | !! statically unstable portion of the water column |
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11 | !! (called if ln_zdfevd=T) |
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12 | !!---------------------------------------------------------------------- |
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13 | !! * Modules used |
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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 zdf_oce ! ocean vertical physics variables |
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17 | USE in_out_manager ! I/O manager |
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18 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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19 | |
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20 | IMPLICIT NONE |
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21 | PRIVATE |
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22 | |
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23 | !! * Routine accessibility |
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24 | PUBLIC zdf_evd ! called by step.F90 |
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25 | |
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26 | !!---------------------------------------------------------------------- |
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27 | !! OPA 9.0 , LODYC-IPSL (2003) |
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28 | !!---------------------------------------------------------------------- |
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29 | |
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30 | CONTAINS |
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31 | |
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32 | SUBROUTINE zdf_evd( kt ) |
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33 | !!---------------------------------------------------------------------- |
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34 | !! *** ROUTINE zdf_evd *** |
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35 | !! |
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36 | !! ** Purpose : Local increased the vertical eddy viscosity and diffu- |
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37 | !! sivity coefficients when a static instability is encountered. |
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38 | !! |
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39 | !! ** Method : avt, and the 4 neighbouring avmu, avmv coefficients |
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40 | !! are set to avevd (namelist parameter) if the water column is |
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41 | !! statically unstable (i.e. if rn2 < -1.e-12 ) |
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42 | !! |
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43 | !! ** Action : Update avt, avmu, avmv in statically instable cases |
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44 | !! |
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45 | !! References : |
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46 | !! Lazar, A., these de l'universite Paris VI, France, 1997 |
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47 | !! History : |
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48 | !! 7.0 ! 97-06 (G. Madec, A. Lazar) Original code |
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49 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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50 | !!---------------------------------------------------------------------- |
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51 | !! * Arguments |
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52 | INTEGER, INTENT( in ) :: kt ! ocean time-step indexocean time step |
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53 | |
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54 | !! * Local declarations |
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55 | INTEGER :: ji, jj, jk ! dummy loop indices |
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56 | !!---------------------------------------------------------------------- |
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57 | |
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58 | IF( kt == nit000 ) THEN |
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59 | IF(lwp) WRITE(numout,*) |
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60 | IF(lwp) WRITE(numout,*) 'zdf_evd : Enhanced Vertical Diffusion (evd)' |
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61 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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62 | IF(lwp) WRITE(numout,*) |
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63 | ENDIF |
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64 | |
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65 | SELECT CASE ( nevdm ) |
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66 | |
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67 | CASE ( 1 ) ! enhance vertical eddy viscosity and diffusivity (if rn2<-1.e-12) |
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68 | ! ! =============== |
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69 | DO jk = 1, jpkm1 ! Horizontal slab |
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70 | ! ! =============== |
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71 | # if defined key_vectopt_loop && ! defined key_autotasking |
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72 | !!! WHERE( rn2(:,:,jk) <= -1.e-12 ) avt(:,:,jk) = tmask(:,:,jk) * avevd ! agissant sur T SEUL! |
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73 | jj = 1 ! big loop forced |
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74 | DO ji = jpi+2, jpij |
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75 | IF( rn2(ji,jj,jk) <= -1.e-12 ) THEN |
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76 | avt (ji ,jj ,jk) = avevd * tmask(ji ,jj ,jk) |
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77 | avmu(ji ,jj ,jk) = avevd * umask(ji ,jj ,jk) |
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78 | avmu(ji-1,jj ,jk) = avevd * umask(ji-1,jj ,jk) |
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79 | avmv(ji ,jj ,jk) = avevd * vmask(ji ,jj ,jk) |
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80 | avmv(ji ,jj-1,jk) = avevd * vmask(ji ,jj-1,jk) |
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81 | ENDIF |
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82 | END DO |
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83 | # else |
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84 | DO jj = 2, jpj ! no vector opt. |
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85 | DO ji = 2, jpi |
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86 | IF( rn2(ji,jj,jk) <= -1.e-12 ) THEN |
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87 | avt (ji ,jj ,jk) = avevd * tmask(ji ,jj ,jk) |
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88 | avmu(ji ,jj ,jk) = avevd * umask(ji ,jj ,jk) |
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89 | avmu(ji-1,jj ,jk) = avevd * umask(ji-1,jj ,jk) |
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90 | avmv(ji ,jj ,jk) = avevd * vmask(ji ,jj ,jk) |
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91 | avmv(ji ,jj-1,jk) = avevd * vmask(ji ,jj-1,jk) |
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92 | ENDIF |
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93 | END DO |
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94 | END DO |
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95 | # endif |
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96 | ! ! =============== |
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97 | END DO ! End of slab |
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98 | ! ! =============== |
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99 | |
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100 | ! Lateral boundary conditions on ( avt, avmu, avmv ) (unchanged sign) |
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101 | ! -------------------------------=================== |
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102 | CALL lbc_lnk( avt , 'W', 1. ) |
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103 | CALL lbc_lnk( avmu, 'U', 1. ) |
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104 | CALL lbc_lnk( avmv, 'V', 1. ) |
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105 | |
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106 | CASE DEFAULT ! enhance vertical eddy diffusivity only (if rn2<-1.e-12) |
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107 | ! ! =============== |
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108 | DO jk = 1, jpkm1 ! Horizontal slab |
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109 | ! ! =============== |
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110 | !!! WHERE( rn2(:,:,jk) <= -1.e-12 ) avt(:,:,jk) = tmask(:,:,jk) * avevd ! agissant sur T SEUL! |
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111 | # if defined key_vectopt_loop && ! defined key_autotasking |
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112 | jj = 1 ! big loop forced |
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113 | DO ji = 1, jpij |
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114 | IF( rn2(ji,jj,jk) <= -1.e-12 ) avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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115 | END DO |
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116 | # else |
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117 | DO jj = 1, jpj ! loop over the whole domain (no lbc_lnk call) |
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118 | DO ji = 1, jpi |
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119 | IF( rn2(ji,jj,jk) <= -1.e-12 ) avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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120 | END DO |
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121 | END DO |
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122 | # endif |
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123 | ! ! =============== |
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124 | END DO ! End of slab |
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125 | ! ! =============== |
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126 | END SELECT |
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127 | |
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128 | END SUBROUTINE zdf_evd |
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129 | |
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130 | !!====================================================================== |
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131 | END MODULE zdfevd |
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