1 | MODULE diahth |
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2 | !!====================================================================== |
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3 | !! *** MODULE diahth *** |
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4 | !! Ocean diagnostics: thermocline and 20 degree depth |
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5 | !!====================================================================== |
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6 | #if defined key_diahth || defined key_esopa |
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7 | !!---------------------------------------------------------------------- |
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8 | !! 'key_diahth' : thermocline depth diag. |
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9 | !!---------------------------------------------------------------------- |
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10 | !! dia_hth : Compute diagnostics associated with the thermocline |
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11 | !!---------------------------------------------------------------------- |
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12 | !! * Modules used |
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13 | USE oce ! ocean dynamics and tracers |
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14 | USE dom_oce ! ocean space and time domain |
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15 | USE phycst ! physical constants |
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16 | USE in_out_manager ! I/O manager |
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17 | USE iom |
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18 | |
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19 | IMPLICIT NONE |
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20 | PRIVATE |
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21 | |
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22 | !! * Routine accessibility |
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23 | PUBLIC dia_hth ! routine called by step.F90 |
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24 | |
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25 | !! * Shared module variables |
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26 | LOGICAL , PUBLIC, PARAMETER :: lk_diahth = .TRUE. !: thermocline-20d depths flag |
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27 | REAL(wp), PUBLIC, DIMENSION(jpi,jpj) :: & !: |
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28 | hth , & !: depth of the max vertical temperature gradient (m) |
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29 | hd20 , & !: depth of 20 C isotherm (m) |
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30 | hd28 , & !: depth of 28 C isotherm (m) |
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31 | htc3 !: heat content of first 300 m |
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32 | |
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33 | !! * Substitutions |
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34 | # include "domzgr_substitute.h90" |
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35 | !!---------------------------------------------------------------------- |
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36 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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37 | !! $Id$ |
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38 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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39 | !!---------------------------------------------------------------------- |
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40 | |
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41 | CONTAINS |
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42 | |
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43 | SUBROUTINE dia_hth( kt ) |
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44 | !!--------------------------------------------------------------------- |
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45 | !! *** ROUTINE dia_hth *** |
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46 | !! |
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47 | !! ** Purpose : |
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48 | !! Computes the depth of strongest vertical temperature gradient |
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49 | !! Computes the depth of the 20 degree isotherm |
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50 | !! Computes the depth of the 28 degree isotherm |
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51 | !! Computes the heat content of first 300 m |
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52 | !! |
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53 | !! ** Method : |
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54 | !! |
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55 | !! History : |
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56 | !! ! 94-09 (J.-P. Boulanger) Original code |
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57 | !! ! 96-11 (E. Guilyardi) OPA8 |
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58 | !! ! 97-08 (G. Madec) optimization |
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59 | !! ! 99-07 (E. Guilyardi) hd28 + heat content |
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60 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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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 | |
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65 | !! * Local declarations |
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66 | INTEGER :: ji, jj, jk ! dummy loop arguments |
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67 | INTEGER :: iid, iif, ilevel ! temporary integers |
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68 | INTEGER, DIMENSION(jpi) :: idepth |
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69 | INTEGER, DIMENSION(jpi,jpj) :: ikc |
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70 | |
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71 | REAL(wp) :: zd, zmoy, zthick_0, zcoef ! temporary scalars |
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72 | REAL(wp), DIMENSION(jpi) :: zmax |
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73 | REAL(wp), DIMENSION(jpi,jpj) :: zthick |
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74 | REAL(wp), DIMENSION(jpi,jpk) :: zdzt |
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75 | !!---------------------------------------------------------------------- |
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76 | |
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77 | IF( kt == nit000 ) THEN |
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78 | IF(lwp) WRITE(numout,*) |
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79 | IF(lwp) WRITE(numout,*) 'dia_hth : diagnostics of the thermocline depth' |
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80 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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81 | IF(lwp) WRITE(numout,*) |
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82 | ENDIF |
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83 | |
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84 | |
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85 | ! -------------------------- ! |
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86 | ! Depth of the thermocline ! |
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87 | ! -------------------------- ! |
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88 | ! The depth of the thermocline is defined as the depth of the |
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89 | ! strongest vertical temperature gradient |
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90 | |
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91 | DO jj = 1, jpj |
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92 | |
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93 | ! vertical gradient of temperature |
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94 | DO jk = 2, jpkm1 |
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95 | zdzt(:,jk) = ( tn(:,jj,jk-1) - tn(:,jj,jk) ) / fse3w(:,jj,jk) * tmask(:,jj,jk) |
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96 | END DO |
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97 | |
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98 | ! search the level of maximum vertical temperature gradient |
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99 | zmax (:) = 0.e0 |
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100 | idepth(:) = 1 |
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101 | DO jk = jpkm1, 2, -1 |
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102 | DO ji = 1, jpi |
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103 | IF( zdzt(ji,jk) > zmax(ji) ) THEN |
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104 | zmax (ji) = zdzt(ji,jk) |
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105 | idepth(ji) = jk |
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106 | ENDIF |
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107 | END DO |
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108 | END DO |
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109 | |
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110 | ! depth of the thermocline |
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111 | DO ji = 1, jpi |
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112 | hth(ji,jj) = fsdepw(ji,jj,idepth(ji)) |
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113 | END DO |
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114 | |
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115 | END DO |
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116 | CALL iom_put( "thermod", hth ) ! depth of the thermocline |
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117 | |
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118 | |
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119 | ! ----------------------- ! |
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120 | ! Depth of 20C isotherm ! |
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121 | ! ----------------------- ! |
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122 | |
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123 | ! initialization to the number of ocean w-point mbathy |
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124 | ! (cf dommsk, minimum value: 1) |
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125 | ikc(:,:) = 1 |
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126 | |
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127 | ! search the depth of 20 degrees isotherm |
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128 | ! ( starting from the top, last level above 20C, if not exist, = 1) |
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129 | DO jk = 1, jpkm1 |
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130 | DO jj = 1, jpj |
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131 | DO ji = 1, jpi |
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132 | IF( tn(ji,jj,jk) >= 20. ) ikc(ji,jj) = jk |
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133 | END DO |
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134 | END DO |
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135 | END DO |
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136 | |
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137 | ! Depth of 20C isotherm |
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138 | DO jj = 1, jpj |
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139 | DO ji = 1, jpi |
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140 | iid = ikc(ji,jj) |
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141 | iif = mbathy(ji,jj) |
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142 | IF( iid /= 1 ) THEN |
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143 | ! linear interpolation |
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144 | zd = fsdept(ji,jj,iid) & |
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145 | + ( fsdept(ji,jj,iid+1) - fsdept(ji,jj,iid) ) & |
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146 | * ( 20.*tmask(ji,jj,iid+1) - tn(ji,jj,iid) ) & |
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147 | / ( tn(ji,jj,iid+1) - tn(ji,jj,iid) & |
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148 | + (1.-tmask(ji,jj,1)) ) |
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149 | ! bound by the ocean depth, minimum value, first T-point depth |
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150 | hd20(ji,jj) = MIN( zd*tmask(ji,jj,1), fsdepw(ji,jj,iif)) |
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151 | ELSE |
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152 | hd20(ji,jj)=0. |
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153 | ENDIF |
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154 | END DO |
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155 | END DO |
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156 | CALL iom_put( "20d", hd20 ) ! depth of the 20 isotherm |
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157 | |
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158 | ! ----------------------- ! |
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159 | ! Depth of 28C isotherm ! |
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160 | ! ----------------------- ! |
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161 | |
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162 | ! initialization to the number of ocean w-point mbathy |
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163 | ! (cf dommsk, minimum value: 1) |
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164 | ikc(:,:) = 1 |
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165 | |
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166 | ! search the depth of 28 degrees isotherm |
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167 | ! ( starting from the top, last level above 28C, if not exist, = 1) |
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168 | DO jk = 1, jpkm1 |
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169 | DO jj = 1, jpj |
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170 | DO ji = 1, jpi |
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171 | IF( tn(ji,jj,jk) >= 28. ) ikc(ji,jj) = jk |
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172 | END DO |
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173 | END DO |
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174 | END DO |
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175 | |
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176 | ! Depth of 28C isotherm |
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177 | DO jj = 1, jpj |
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178 | DO ji = 1, jpi |
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179 | iid = ikc(ji,jj) |
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180 | iif = mbathy(ji,jj) |
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181 | IF( iid /= 1 ) THEN |
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182 | ! linear interpolation |
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183 | zd = fsdept(ji,jj,iid) & |
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184 | + ( fsdept(ji,jj,iid+1) - fsdept(ji,jj,iid) ) & |
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185 | * ( 28.*tmask(ji,jj,iid+1) - tn(ji,jj,iid) ) & |
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186 | / ( tn(ji,jj,iid+1) - tn(ji,jj,iid) & |
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187 | + ( 1. - tmask(ji,jj,1) ) ) |
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188 | ! bound by the ocean depth, minimum value, first T-point depth |
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189 | hd28(ji,jj) = MIN( zd*tmask(ji,jj,1), fsdepw(ji,jj,iif) ) |
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190 | ELSE |
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191 | hd28(ji,jj) = 0. |
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192 | ENDIF |
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193 | END DO |
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194 | END DO |
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195 | CALL iom_put( "28d", hd28 ) ! depth of the 28 isotherm |
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196 | |
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197 | ! ----------------------------------------- ! |
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198 | ! Heat content of first 300 m (18 levels) ! |
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199 | ! ----------------------------------------- ! |
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200 | |
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201 | ! find ilevel with (ilevel+1) the deepest W-level above 300m (we assume we can use e3t_0 to do this search...) |
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202 | ilevel = 0 |
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203 | zthick_0 = 0.e0 |
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204 | DO jk = 1, jpk-1 |
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205 | zthick_0 = zthick_0 + e3t_0(jk) |
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206 | IF( zthick_0 < 300. ) ilevel = jk |
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207 | END DO |
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208 | ! surface boundary condition |
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209 | IF( lk_vvl ) THEN ; zthick(:,:) = 0.e0 ; htc3(:,:) = 0.e0 |
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210 | ELSE ; zthick(:,:) = sshn(:,:) ; htc3(:,:) = tn(:,:,jk) * sshn(:,:) * tmask(:,:,jk) |
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211 | ENDIF |
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212 | ! integration down to ilevel |
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213 | DO jk = 1, ilevel |
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214 | zthick(:,:) = zthick(:,:) + fse3t(:,:,jk) |
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215 | htc3 (:,:) = htc3 (:,:) + fse3t(:,:,jk) * tn(:,:,jk) * tmask(:,:,jk) |
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216 | END DO |
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217 | ! deepest layer |
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218 | zthick(:,:) = 300. - zthick(:,:) ! remaining thickness to reach 300m |
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219 | htc3(:,:) = htc3(:,:) + tn(:,:,ilevel+1) * MIN( fse3t(:,:,ilevel+1), zthick(:,:) ) * tmask(:,:,ilevel+1) |
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220 | ! from temperature to heat contain |
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221 | zcoef = rau0 * rcp |
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222 | htc3(:,:) = zcoef * htc3(:,:) |
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223 | CALL iom_put( "hc300", htc3 ) ! first 300m heaat content |
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224 | |
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225 | END SUBROUTINE dia_hth |
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226 | |
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227 | #else |
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228 | !!---------------------------------------------------------------------- |
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229 | !! Default option : Empty module |
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230 | !!---------------------------------------------------------------------- |
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231 | LOGICAL , PUBLIC, PARAMETER :: lk_diahth = .FALSE. !: thermocline-20d depths flag |
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232 | CONTAINS |
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233 | SUBROUTINE dia_hth( kt ) ! Empty routine |
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234 | WRITE(*,*) 'dia_hth: You should not have seen this print! error?', kt |
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235 | END SUBROUTINE dia_hth |
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236 | #endif |
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237 | |
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238 | !!====================================================================== |
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239 | END MODULE diahth |
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