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 | !! History : OPA ! 1994-09 (J.-P. Boulanger) Original code |
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7 | !! ! 1996-11 (E. Guilyardi) OPA8 |
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8 | !! ! 1997-08 (G. Madec) optimization |
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9 | !! ! 1999-07 (E. Guilyardi) hd28 + heat content |
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10 | !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module |
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11 | !! 3.2 ! 2009-07 (S. Masson) hc300 bugfix + cleaning + add new diag |
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12 | !!---------------------------------------------------------------------- |
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13 | !! dia_hth : Compute varius diagnostics associated with the mixed layer |
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14 | !!---------------------------------------------------------------------- |
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15 | USE oce ! ocean dynamics and tracers |
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16 | USE dom_oce ! ocean space and time domain |
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17 | USE phycst ! physical constants |
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18 | ! |
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19 | USE in_out_manager ! I/O manager |
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20 | USE lib_mpp ! MPP library |
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21 | USE iom ! I/O library |
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22 | USE timing ! preformance summary |
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23 | |
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24 | IMPLICIT NONE |
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25 | PRIVATE |
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26 | |
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27 | PUBLIC dia_hth ! routine called by step.F90 |
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28 | PUBLIC dia_hth_alloc ! routine called by nemogcm.F90 |
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29 | |
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30 | LOGICAL, SAVE :: l_hth !: thermocline-20d depths flag |
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31 | |
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32 | ! note: following variables should move to local variables once iom_put is always used |
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33 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hth !: depth of the max vertical temperature gradient [m] |
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34 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hd20 !: depth of 20 C isotherm [m] |
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35 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hd26 !: depth of 26 C isotherm [m] |
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36 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hd28 !: depth of 28 C isotherm [m] |
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37 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: htc3 !: heat content of first 300 m [W] |
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38 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: htc7 !: heat content of first 700 m [W] |
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39 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: htc20 !: heat content of first 2000 m [W] |
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40 | |
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41 | |
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42 | !!---------------------------------------------------------------------- |
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43 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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44 | !! $Id$ |
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45 | !! Software governed by the CeCILL license (see ./LICENSE) |
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46 | !!---------------------------------------------------------------------- |
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47 | CONTAINS |
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48 | |
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49 | FUNCTION dia_hth_alloc() |
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50 | !!--------------------------------------------------------------------- |
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51 | INTEGER :: dia_hth_alloc |
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52 | !!--------------------------------------------------------------------- |
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53 | ! |
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54 | ALLOCATE( hth(jpi,jpj), hd20(jpi,jpj), hd26(jpi,jpj), hd28(jpi,jpj), & |
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55 | & htc3(jpi,jpj), htc7(jpi,jpj), htc20(jpi,jpj), STAT=dia_hth_alloc ) |
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56 | ! |
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57 | CALL mpp_sum ( 'diahth', dia_hth_alloc ) |
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58 | IF(dia_hth_alloc /= 0) CALL ctl_stop( 'STOP', 'dia_hth_alloc: failed to allocate arrays.' ) |
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59 | ! |
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60 | END FUNCTION dia_hth_alloc |
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61 | |
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62 | |
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63 | SUBROUTINE dia_hth( kt ) |
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64 | !!--------------------------------------------------------------------- |
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65 | !! *** ROUTINE dia_hth *** |
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66 | !! |
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67 | !! ** Purpose : Computes |
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68 | !! the mixing layer depth (turbocline): avt = 5.e-4 |
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69 | !! the depth of strongest vertical temperature gradient |
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70 | !! the mixed layer depth with density criteria: rho = rho(10m or surf) + 0.03(or 0.01) |
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71 | !! the mixed layer depth with temperature criteria: abs( tn - tn(10m) ) = 0.2 |
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72 | !! the top of the thermochine: tn = tn(10m) - ztem2 |
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73 | !! the pycnocline depth with density criteria equivalent to a temperature variation |
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74 | !! rho = rho10m + (dr/dT)(T,S,10m)*(-0.2 degC) |
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75 | !! the barrier layer thickness |
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76 | !! the maximal verical inversion of temperature and its depth max( 0, max of tn - tn(10m) ) |
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77 | !! the depth of the 20 degree isotherm (linear interpolation) |
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78 | !! the depth of the 28 degree isotherm (linear interpolation) |
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79 | !! the heat content of first 300 m |
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80 | !! |
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81 | !! ** Method : |
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82 | !!------------------------------------------------------------------- |
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83 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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84 | !! |
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85 | INTEGER :: ji, jj, jk ! dummy loop arguments |
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86 | REAL(wp) :: zrho3 = 0.03_wp ! density criterion for mixed layer depth |
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87 | REAL(wp) :: zrho1 = 0.01_wp ! density criterion for mixed layer depth |
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88 | REAL(wp) :: ztem2 = 0.2_wp ! temperature criterion for mixed layer depth |
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89 | REAL(wp) :: zztmp, zzdep ! temporary scalars inside do loop |
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90 | REAL(wp) :: zu, zv, zw, zut, zvt ! temporary workspace |
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91 | REAL(wp), DIMENSION(jpi,jpj) :: zabs2 ! MLD: abs( tn - tn(10m) ) = ztem2 |
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92 | REAL(wp), DIMENSION(jpi,jpj) :: ztm2 ! Top of thermocline: tn = tn(10m) - ztem2 |
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93 | REAL(wp), DIMENSION(jpi,jpj) :: zrho10_3 ! MLD: rho = rho10m + zrho3 |
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94 | REAL(wp), DIMENSION(jpi,jpj) :: zpycn ! pycnocline: rho = rho10m + (dr/dT)(T,S,10m)*(-0.2 degC) |
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95 | REAL(wp), DIMENSION(jpi,jpj) :: ztinv ! max of temperature inversion |
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96 | REAL(wp), DIMENSION(jpi,jpj) :: zdepinv ! depth of temperature inversion |
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97 | REAL(wp), DIMENSION(jpi,jpj) :: zrho0_3 ! MLD rho = rho(surf) = 0.03 |
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98 | REAL(wp), DIMENSION(jpi,jpj) :: zrho0_1 ! MLD rho = rho(surf) = 0.01 |
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99 | REAL(wp), DIMENSION(jpi,jpj) :: zmaxdzT ! max of dT/dz |
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100 | REAL(wp), DIMENSION(jpi,jpj) :: zdelr ! delta rho equivalent to deltaT = 0.2 |
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101 | !!---------------------------------------------------------------------- |
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102 | IF( ln_timing ) CALL timing_start('dia_hth') |
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103 | |
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104 | IF( kt == nit000 ) THEN |
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105 | l_hth = .FALSE. |
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106 | IF( iom_use( 'mlddzt' ) .OR. iom_use( 'mldr0_3' ) .OR. iom_use( 'mldr0_1' ) .OR. & |
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107 | & iom_use( 'mld_dt02' ) .OR. iom_use( 'topthdep' ) .OR. iom_use( 'mldr10_3' ) .OR. & |
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108 | & iom_use( '20d' ) .OR. iom_use( '26d' ) .OR. iom_use( '28d' ) .OR. & |
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109 | & iom_use( 'hc300' ) .OR. iom_use( 'hc700' ) .OR. iom_use( 'hc2000' ) .OR. & |
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110 | & iom_use( 'pycndep' ) .OR. iom_use( 'tinv' ) .OR. iom_use( 'depti' ) ) l_hth = .TRUE. |
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111 | ! ! allocate dia_hth array |
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112 | IF( l_hth ) THEN |
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113 | IF( dia_hth_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'dia_hth : unable to allocate standard arrays' ) |
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114 | IF(lwp) WRITE(numout,*) |
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115 | IF(lwp) WRITE(numout,*) 'dia_hth : diagnostics of the thermocline depth' |
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116 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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117 | IF(lwp) WRITE(numout,*) |
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118 | ENDIF |
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119 | ENDIF |
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120 | |
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121 | IF( l_hth ) THEN |
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122 | ! |
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123 | IF( iom_use( 'mlddzt' ) .OR. iom_use( 'mldr0_3' ) .OR. iom_use( 'mldr0_1' ) ) THEN |
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124 | ! initialization |
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125 | ztinv (:,:) = 0._wp |
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126 | zdepinv(:,:) = 0._wp |
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127 | zmaxdzT(:,:) = 0._wp |
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128 | DO jj = 1, jpj |
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129 | DO ji = 1, jpi |
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130 | zztmp = gdepw_n(ji,jj,mbkt(ji,jj)+1) |
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131 | hth (ji,jj) = zztmp |
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132 | zabs2 (ji,jj) = zztmp |
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133 | ztm2 (ji,jj) = zztmp |
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134 | zrho10_3(ji,jj) = zztmp |
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135 | zpycn (ji,jj) = zztmp |
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136 | END DO |
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137 | END DO |
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138 | IF( nla10 > 1 ) THEN |
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139 | DO jj = 1, jpj |
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140 | DO ji = 1, jpi |
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141 | zztmp = gdepw_n(ji,jj,mbkt(ji,jj)+1) |
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142 | zrho0_3(ji,jj) = zztmp |
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143 | zrho0_1(ji,jj) = zztmp |
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144 | END DO |
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145 | END DO |
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146 | ENDIF |
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147 | |
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148 | ! Preliminary computation |
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149 | ! computation of zdelr = (dr/dT)(T,S,10m)*(-0.2 degC) |
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150 | DO jj = 1, jpj |
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151 | DO ji = 1, jpi |
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152 | IF( tmask(ji,jj,nla10) == 1. ) THEN |
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153 | zu = 1779.50 + 11.250 * tsn(ji,jj,nla10,jp_tem) - 3.80 * tsn(ji,jj,nla10,jp_sal) & |
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154 | & - 0.0745 * tsn(ji,jj,nla10,jp_tem) * tsn(ji,jj,nla10,jp_tem) & |
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155 | & - 0.0100 * tsn(ji,jj,nla10,jp_tem) * tsn(ji,jj,nla10,jp_sal) |
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156 | zv = 5891.00 + 38.000 * tsn(ji,jj,nla10,jp_tem) + 3.00 * tsn(ji,jj,nla10,jp_sal) & |
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157 | & - 0.3750 * tsn(ji,jj,nla10,jp_tem) * tsn(ji,jj,nla10,jp_tem) |
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158 | zut = 11.25 - 0.149 * tsn(ji,jj,nla10,jp_tem) - 0.01 * tsn(ji,jj,nla10,jp_sal) |
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159 | zvt = 38.00 - 0.750 * tsn(ji,jj,nla10,jp_tem) |
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160 | zw = (zu + 0.698*zv) * (zu + 0.698*zv) |
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161 | zdelr(ji,jj) = ztem2 * (1000.*(zut*zv - zvt*zu)/zw) |
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162 | ELSE |
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163 | zdelr(ji,jj) = 0._wp |
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164 | ENDIF |
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165 | END DO |
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166 | END DO |
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167 | |
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168 | ! ------------------------------------------------------------- ! |
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169 | ! thermocline depth: strongest vertical gradient of temperature ! |
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170 | ! turbocline depth (mixing layer depth): avt = zavt5 ! |
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171 | ! MLD: rho = rho(1) + zrho3 ! |
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172 | ! MLD: rho = rho(1) + zrho1 ! |
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173 | ! ------------------------------------------------------------- ! |
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174 | DO jk = jpkm1, 2, -1 ! loop from bottom to 2 |
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175 | DO jj = 1, jpj |
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176 | DO ji = 1, jpi |
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177 | ! |
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178 | zzdep = gdepw_n(ji,jj,jk) |
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179 | zztmp = ( tsn(ji,jj,jk-1,jp_tem) - tsn(ji,jj,jk,jp_tem) ) & |
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180 | & / zzdep * tmask(ji,jj,jk) ! vertical gradient of temperature (dT/dz) |
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181 | zzdep = zzdep * tmask(ji,jj,1) |
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182 | |
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183 | IF( zztmp > zmaxdzT(ji,jj) ) THEN |
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184 | zmaxdzT(ji,jj) = zztmp |
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185 | hth (ji,jj) = zzdep ! max and depth of dT/dz |
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186 | ENDIF |
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187 | |
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188 | IF( nla10 > 1 ) THEN |
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189 | zztmp = rhop(ji,jj,jk) - rhop(ji,jj,1) ! delta rho(1) |
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190 | IF( zztmp > zrho3 ) zrho0_3(ji,jj) = zzdep ! > 0.03 |
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191 | IF( zztmp > zrho1 ) zrho0_1(ji,jj) = zzdep ! > 0.01 |
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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 | END DO |
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196 | |
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197 | CALL iom_put( 'mlddzt', hth ) ! depth of the thermocline |
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198 | IF( nla10 > 1 ) THEN |
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199 | CALL iom_put( 'mldr0_3', zrho0_3 ) ! MLD delta rho(surf) = 0.03 |
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200 | CALL iom_put( 'mldr0_1', zrho0_1 ) ! MLD delta rho(surf) = 0.01 |
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201 | ENDIF |
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202 | ! |
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203 | ENDIF |
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204 | ! |
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205 | IF( iom_use( 'mld_dt02' ) .OR. iom_use( 'topthdep' ) .OR. iom_use( 'mldr10_3' ) .OR. & |
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206 | & iom_use( 'pycndep' ) .OR. iom_use( 'tinv' ) .OR. iom_use( 'depti' ) ) THEN |
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207 | ! ------------------------------------------------------------- ! |
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208 | ! MLD: abs( tn - tn(10m) ) = ztem2 ! |
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209 | ! Top of thermocline: tn = tn(10m) - ztem2 ! |
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210 | ! MLD: rho = rho10m + zrho3 ! |
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211 | ! pycnocline: rho = rho10m + (dr/dT)(T,S,10m)*(-0.2 degC) ! |
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212 | ! temperature inversion: max( 0, max of tn - tn(10m) ) ! |
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213 | ! depth of temperature inversion ! |
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214 | ! ------------------------------------------------------------- ! |
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215 | DO jk = jpkm1, nlb10, -1 ! loop from bottom to nlb10 |
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216 | DO jj = 1, jpj |
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217 | DO ji = 1, jpi |
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218 | ! |
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219 | zzdep = gdepw_n(ji,jj,jk) * tmask(ji,jj,1) |
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220 | ! |
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221 | zztmp = tsn(ji,jj,nla10,jp_tem) - tsn(ji,jj,jk,jp_tem) ! - delta T(10m) |
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222 | IF( ABS(zztmp) > ztem2 ) zabs2 (ji,jj) = zzdep ! abs > 0.2 |
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223 | IF( zztmp > ztem2 ) ztm2 (ji,jj) = zzdep ! > 0.2 |
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224 | zztmp = -zztmp ! delta T(10m) |
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225 | IF( zztmp > ztinv(ji,jj) ) THEN ! temperature inversion |
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226 | ztinv(ji,jj) = zztmp |
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227 | zdepinv (ji,jj) = zzdep ! max value and depth |
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228 | ENDIF |
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229 | |
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230 | zztmp = rhop(ji,jj,jk) - rhop(ji,jj,nla10) ! delta rho(10m) |
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231 | IF( zztmp > zrho3 ) zrho10_3(ji,jj) = zzdep ! > 0.03 |
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232 | IF( zztmp > zdelr(ji,jj) ) zpycn (ji,jj) = zzdep ! > equi. delta T(10m) - 0.2 |
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233 | ! |
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234 | END DO |
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235 | END DO |
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236 | END DO |
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237 | |
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238 | CALL iom_put( 'mld_dt02', zabs2 ) ! MLD abs(delta t) - 0.2 |
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239 | CALL iom_put( 'topthdep', ztm2 ) ! T(10) - 0.2 |
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240 | CALL iom_put( 'mldr10_3', zrho10_3 ) ! MLD delta rho(10m) = 0.03 |
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241 | CALL iom_put( 'pycndep' , zpycn ) ! MLD delta rho equi. delta T(10m) = 0.2 |
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242 | CALL iom_put( 'tinv' , ztinv ) ! max. temp. inv. (t10 ref) |
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243 | CALL iom_put( 'depti' , zdepinv ) ! depth of max. temp. inv. (t10 ref) |
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244 | ! |
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245 | ENDIF |
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246 | |
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247 | ! ------------------------------- ! |
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248 | ! Depth of 20C/26C/28C isotherm ! |
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249 | ! ------------------------------- ! |
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250 | IF( iom_use ('20d') ) THEN ! depth of the 20 isotherm |
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251 | ztem2 = 20. |
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252 | CALL dia_hth_dep( ztem2, hd20 ) |
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253 | CALL iom_put( '20d', hd20 ) |
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254 | ENDIF |
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255 | ! |
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256 | IF( iom_use ('26d') ) THEN ! depth of the 26 isotherm |
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257 | ztem2 = 26. |
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258 | CALL dia_hth_dep( ztem2, hd26 ) |
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259 | CALL iom_put( '26d', hd26 ) |
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260 | ENDIF |
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261 | ! |
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262 | IF( iom_use ('28d') ) THEN ! depth of the 28 isotherm |
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263 | ztem2 = 28. |
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264 | CALL dia_hth_dep( ztem2, hd28 ) |
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265 | CALL iom_put( '28d', hd28 ) |
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266 | ENDIF |
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267 | |
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268 | ! ----------------------------- ! |
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269 | ! Heat content of first 300 m ! |
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270 | ! ----------------------------- ! |
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271 | IF( iom_use ('hc300') ) THEN |
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272 | zzdep = 300. |
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273 | CALL dia_hth_htc( zzdep, tsn(:,:,:,jp_tem), htc3 ) |
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274 | CALL iom_put( 'hc300', rau0_rcp * htc3 ) ! vertically integrated heat content (J/m2) |
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275 | ENDIF |
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276 | ! |
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277 | ! ----------------------------- ! |
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278 | ! Heat content of first 700 m ! |
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279 | ! ----------------------------- ! |
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280 | IF( iom_use ('hc700') ) THEN |
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281 | zzdep = 700. |
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282 | CALL dia_hth_htc( zzdep, tsn(:,:,:,jp_tem), htc7 ) |
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283 | CALL iom_put( 'hc700', rau0_rcp * htc7 ) ! vertically integrated heat content (J/m2) |
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284 | |
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285 | ENDIF |
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286 | ! |
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287 | ! ----------------------------- ! |
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288 | ! Heat content of first 2000 m ! |
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289 | ! ----------------------------- ! |
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290 | IF( iom_use ('hc2000') ) THEN |
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291 | zzdep = 2000. |
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292 | CALL dia_hth_htc( zzdep, tsn(:,:,:,jp_tem), htc20 ) |
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293 | CALL iom_put( 'hc2000', rau0_rcp * htc20 ) ! vertically integrated heat content (J/m2) |
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294 | ENDIF |
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295 | ! |
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296 | ENDIF |
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297 | |
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298 | ! |
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299 | IF( ln_timing ) CALL timing_stop('dia_hth') |
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300 | ! |
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301 | END SUBROUTINE dia_hth |
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302 | |
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303 | SUBROUTINE dia_hth_dep( ptem, pdept ) |
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304 | ! |
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305 | REAL(wp), INTENT(in) :: ptem |
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306 | REAL(wp), DIMENSION(jpi,jpj), INTENT(out) :: pdept |
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307 | ! |
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308 | INTEGER :: ji, jj, jk, iid |
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309 | REAL(wp) :: zztmp, zzdep |
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310 | INTEGER, DIMENSION(jpi,jpj) :: iktem |
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311 | |
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312 | ! --------------------------------------- ! |
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313 | ! search deepest level above ptem ! |
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314 | ! --------------------------------------- ! |
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315 | iktem(:,:) = 1 |
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316 | DO jk = 1, jpkm1 ! beware temperature is not always decreasing with depth => loop from top to bottom |
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317 | DO jj = 1, jpj |
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318 | DO ji = 1, jpi |
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319 | zztmp = tsn(ji,jj,jk,jp_tem) |
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320 | IF( zztmp >= ptem ) iktem(ji,jj) = jk |
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321 | END DO |
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322 | END DO |
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323 | END DO |
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324 | |
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325 | ! ------------------------------- ! |
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326 | ! Depth of ptem isotherm ! |
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327 | ! ------------------------------- ! |
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328 | DO jj = 1, jpj |
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329 | DO ji = 1, jpi |
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330 | ! |
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331 | zzdep = gdepw_n(ji,jj,mbkt(ji,jj)+1) ! depth of the ocean bottom |
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332 | ! |
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333 | iid = iktem(ji,jj) |
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334 | IF( iid /= 1 ) THEN |
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335 | zztmp = gdept_n(ji,jj,iid ) & ! linear interpolation |
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336 | & + ( gdept_n(ji,jj,iid+1) - gdept_n(ji,jj,iid) ) & |
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337 | & * ( 20.*tmask(ji,jj,iid+1) - tsn(ji,jj,iid,jp_tem) ) & |
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338 | & / ( tsn(ji,jj,iid+1,jp_tem) - tsn(ji,jj,iid,jp_tem) + (1.-tmask(ji,jj,1)) ) |
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339 | pdept(ji,jj) = MIN( zztmp , zzdep) * tmask(ji,jj,1) ! bound by the ocean depth |
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340 | ELSE |
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341 | pdept(ji,jj) = 0._wp |
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342 | ENDIF |
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343 | END DO |
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344 | END DO |
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345 | ! |
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346 | END SUBROUTINE dia_hth_dep |
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347 | |
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348 | |
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349 | SUBROUTINE dia_hth_htc( pdep, ptn, phtc ) |
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350 | ! |
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351 | REAL(wp), INTENT(in) :: pdep ! depth over the heat content |
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352 | REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(in) :: ptn |
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353 | REAL(wp), DIMENSION(jpi,jpj), INTENT(inout) :: phtc |
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354 | ! |
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355 | INTEGER :: ji, jj, jk, ik |
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356 | REAL(wp), DIMENSION(jpi,jpj) :: zthick |
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357 | INTEGER , DIMENSION(jpi,jpj) :: ilevel |
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358 | |
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359 | |
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360 | ! surface boundary condition |
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361 | |
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362 | IF( .NOT. ln_linssh ) THEN ; zthick(:,:) = 0._wp ; phtc(:,:) = 0._wp |
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363 | ELSE ; zthick(:,:) = sshn(:,:) ; phtc(:,:) = ptn(:,:,1) * sshn(:,:) * tmask(:,:,1) |
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364 | ENDIF |
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365 | ! |
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366 | ilevel(:,:) = 1 |
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367 | DO jk = 2, jpkm1 |
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368 | DO jj = 1, jpj |
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369 | DO ji = 1, jpi |
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370 | IF( ( gdept_n(ji,jj,jk) < pdep ) .AND. ( tmask(ji,jj,jk) == 1 ) ) THEN |
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371 | ilevel(ji,jj) = jk |
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372 | zthick(ji,jj) = zthick(ji,jj) + e3t_n(ji,jj,jk) |
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373 | phtc (ji,jj) = phtc (ji,jj) + e3t_n(ji,jj,jk) * ptn(ji,jj,jk) |
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374 | ENDIF |
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375 | ENDDO |
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376 | ENDDO |
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377 | ENDDO |
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378 | ! |
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379 | DO jj = 1, jpj |
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380 | DO ji = 1, jpi |
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381 | ik = ilevel(ji,jj) |
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382 | zthick(ji,jj) = pdep - zthick(ji,jj) ! remaining thickness to reach depht pdep |
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383 | phtc(ji,jj) = phtc(ji,jj) + ptn(ji,jj,ik+1) * MIN( e3t_n(ji,jj,ik+1), zthick(ji,jj) ) & |
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384 | * tmask(ji,jj,ik+1) |
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385 | END DO |
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386 | ENDDO |
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387 | ! |
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388 | ! |
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389 | END SUBROUTINE dia_hth_htc |
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390 | |
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391 | !!====================================================================== |
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392 | END MODULE diahth |
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