1 | MODULE zdfmxl |
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2 | !!====================================================================== |
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3 | !! *** MODULE zdfmxl *** |
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4 | !! Ocean physics: mixed layer depth |
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5 | !!====================================================================== |
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6 | !! History : 1.0 ! 2003-08 (G. Madec) original code |
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7 | !! 3.2 ! 2009-07 (S. Masson, G. Madec) IOM + merge of DO-loop |
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8 | !!---------------------------------------------------------------------- |
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9 | !! zdf_mxl : Compute the turbocline and mixed layer depths. |
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10 | !!---------------------------------------------------------------------- |
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11 | USE oce ! ocean dynamics and tracers variables |
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12 | USE dom_oce ! ocean space and time domain variables |
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13 | USE zdf_oce ! ocean vertical physics |
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14 | USE in_out_manager ! I/O manager |
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15 | USE prtctl ! Print control |
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16 | USE iom ! I/O library |
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17 | USE eosbn2 ! Equation of state |
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18 | USE phycst, ONLY : rau0 ! reference density |
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19 | USE lbclnk |
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20 | USE lib_mpp ! MPP library |
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21 | USE wrk_nemo ! work arrays |
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22 | USE timing ! Timing |
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23 | USE trc_oce, ONLY : lk_offline ! offline flag |
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24 | |
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25 | IMPLICIT NONE |
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26 | PRIVATE |
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27 | |
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28 | PUBLIC zdf_mxl ! called by step.F90 |
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29 | |
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30 | ! Namelist variables for namzdf_karaml |
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31 | |
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32 | LOGICAL :: ln_kara ! Logical switch for calculating kara mixed |
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33 | ! layer |
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34 | LOGICAL :: ln_kara_write25h ! Logical switch for 25 hour outputs |
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35 | INTEGER :: jpmld_type ! mixed layer type |
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36 | REAL(wp) :: ppz_ref ! depth of initial T_ref |
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37 | REAL(wp) :: ppdT_crit ! Critical temp diff |
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38 | REAL(wp) :: ppiso_frac ! Fraction of ppdT_crit used |
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39 | |
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40 | !Used for 25h mean |
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41 | LOGICAL, PRIVATE :: kara_25h_init = .TRUE. !Logical used to initalise 25h |
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42 | !outputs. Necissary, because we need to |
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43 | !initalise the kara_25h on the zeroth |
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44 | !timestep (i.e in the nemogcm_init call) |
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45 | REAL, PRIVATE, ALLOCATABLE, DIMENSION(:,:) :: hmld_kara_25h |
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46 | |
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47 | INTEGER , PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: nmln !: number of level in the mixed layer (used by TOP) |
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48 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmld_kara !: mixed layer depth of Kara et al [m] |
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49 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmld !: mixing layer depth (turbocline) [m] |
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50 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlp !: mixed layer depth (rho=rho0+zdcrit) [m] |
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51 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlpt !: mixed layer depth at t-points [m] |
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52 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmld_tref !: mixed layer depth at t-points - temperature criterion [m] |
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53 | |
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54 | !! * Substitutions |
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55 | # include "domzgr_substitute.h90" |
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56 | !!---------------------------------------------------------------------- |
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57 | !! NEMO/OPA 4.0 , NEMO Consortium (2011) |
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58 | !! $Id$ |
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59 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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60 | !!---------------------------------------------------------------------- |
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61 | CONTAINS |
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62 | |
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63 | INTEGER FUNCTION zdf_mxl_alloc() |
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64 | !!---------------------------------------------------------------------- |
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65 | !! *** FUNCTION zdf_mxl_alloc *** |
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66 | !!---------------------------------------------------------------------- |
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67 | zdf_mxl_alloc = 0 ! set to zero if no array to be allocated |
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68 | IF( .NOT. ALLOCATED( nmln ) ) THEN |
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69 | ALLOCATE( nmln(jpi,jpj), hmld(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), & |
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70 | hmld_tref(jpi,jpj), STAT= zdf_mxl_alloc ) |
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71 | ! |
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72 | IF( lk_mpp ) CALL mpp_sum ( zdf_mxl_alloc ) |
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73 | IF( zdf_mxl_alloc /= 0 ) CALL ctl_warn('zdf_mxl_alloc: failed to allocate arrays.') |
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74 | ! |
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75 | ENDIF |
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76 | END FUNCTION zdf_mxl_alloc |
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77 | |
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78 | |
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79 | SUBROUTINE zdf_mxl( kt ) |
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80 | !!---------------------------------------------------------------------- |
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81 | !! *** ROUTINE zdfmxl *** |
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82 | !! |
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83 | !! ** Purpose : Compute the turbocline depth and the mixed layer depth |
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84 | !! with a simple density criteria. Also calculates the mixed layer |
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85 | !! depth of Kara et al by calling zdf_mxl_kara. |
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86 | !! |
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87 | !! ** Method : The mixed layer depth is the shallowest W depth with |
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88 | !! the density of the corresponding T point (just bellow) bellow a |
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89 | !! given value defined locally as rho(10m) + zrho_c |
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90 | !! The turbocline depth is the depth at which the vertical |
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91 | !! eddy diffusivity coefficient (resulting from the vertical physics |
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92 | !! alone, not the isopycnal part, see trazdf.F) fall below a given |
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93 | !! value defined locally (avt_c here taken equal to 5 cm/s2) |
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94 | !! |
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95 | !! ** Action : nmln, hmld, hmlp, hmlpt |
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96 | !!---------------------------------------------------------------------- |
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97 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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98 | !! |
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99 | INTEGER :: ji, jj, jk ! dummy loop indices |
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100 | INTEGER :: iikn, iiki ! temporary integer within a do loop |
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101 | INTEGER, POINTER, DIMENSION(:,:) :: imld ! temporary workspace |
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102 | REAL(wp) :: zrho_c = 0.01_wp ! density criterion for mixed layer depth |
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103 | REAL(wp) :: zavt_c = 5.e-4_wp ! Kz criterion for the turbocline depth |
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104 | REAL(wp) :: t_ref ! Reference temperature |
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105 | REAL(wp) :: temp_c = 0.2 ! temperature criterion for mixed layer depth |
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106 | !!---------------------------------------------------------------------- |
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107 | ! |
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108 | IF( nn_timing == 1 ) CALL timing_start('zdf_mxl') |
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109 | ! |
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110 | CALL wrk_alloc( jpi,jpj, imld ) |
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111 | |
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112 | IF( kt == nit000 ) THEN |
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113 | IF(lwp) WRITE(numout,*) |
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114 | IF(lwp) WRITE(numout,*) 'zdf_mxl : mixed layer depth' |
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115 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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116 | ! ! allocate zdfmxl arrays |
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117 | IF( zdf_mxl_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'zdf_mxl : unable to allocate arrays' ) |
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118 | ENDIF |
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119 | |
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120 | ! w-level of the mixing and mixed layers |
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121 | nmln(:,:) = mbkt(:,:) + 1 ! Initialization to the number of w ocean point |
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122 | imld(:,:) = mbkt(:,:) + 1 |
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123 | DO jk = jpkm1, nlb10, -1 ! from the bottom to nlb10 |
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124 | DO jj = 1, jpj |
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125 | DO ji = 1, jpi |
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126 | IF( rhop(ji,jj,jk) > rhop(ji,jj,nla10) + zrho_c ) nmln(ji,jj) = jk ! Mixed layer |
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127 | IF( avt (ji,jj,jk) < zavt_c ) imld(ji,jj) = jk ! Turbocline |
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128 | END DO |
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129 | END DO |
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130 | END DO |
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131 | ! depth of the mixing and mixed layers |
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132 | |
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133 | CALL zdf_mxl_kara( kt ) |
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134 | |
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135 | DO jj = 1, jpj |
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136 | DO ji = 1, jpi |
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137 | iiki = imld(ji,jj) |
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138 | iikn = nmln(ji,jj) |
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139 | hmld (ji,jj) = fsdepw(ji,jj,iiki ) * tmask(ji,jj,1) ! Turbocline depth |
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140 | hmlp (ji,jj) = fsdepw(ji,jj,iikn ) * tmask(ji,jj,1) ! Mixed layer depth |
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141 | hmlpt(ji,jj) = fsdept(ji,jj,iikn-1) ! depth of the last T-point inside the mixed layer |
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142 | END DO |
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143 | END DO |
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144 | #if defined key_iomput |
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145 | IF( .NOT.lk_offline ) THEN ! no need to output in offline mode |
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146 | CALL iom_put( "mldr10_1", hmlp ) ! mixed layer depth |
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147 | CALL iom_put( "mldkz5" , hmld ) ! turbocline depth |
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148 | ENDIF |
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149 | #endif |
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150 | |
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151 | !For the AMM model assimiation uses a temperature based mixed layer depth |
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152 | !This is defined here |
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153 | DO jj = 1, jpj |
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154 | DO ji = 1, jpi |
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155 | hmld_tref(ji,jj)=fsdept(ji,jj,1 ) |
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156 | IF(tmask(ji,jj,1) > 0.)THEN |
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157 | t_ref=tsn(ji,jj,1,jp_tem) |
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158 | DO jk=2,jpk |
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159 | IF(tmask(ji,jj,jk)==0.)THEN |
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160 | hmld_tref(ji,jj)=fsdept(ji,jj,jk ) |
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161 | EXIT |
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162 | ELSEIF( ABS(tsn(ji,jj,jk,jp_tem)-t_ref) < temp_c)THEN |
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163 | hmld_tref(ji,jj)=fsdept(ji,jj,jk ) |
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164 | ELSE |
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165 | EXIT |
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166 | ENDIF |
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167 | ENDDO |
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168 | ENDIF |
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169 | ENDDO |
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170 | ENDDO |
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171 | |
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172 | IF(ln_ctl) CALL prt_ctl( tab2d_1=REAL(nmln,wp), clinfo1=' nmln : ', tab2d_2=hmlp, clinfo2=' hmlp : ', ovlap=1 ) |
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173 | ! |
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174 | CALL wrk_dealloc( jpi,jpj, imld ) |
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175 | ! |
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176 | IF( nn_timing == 1 ) CALL timing_stop('zdf_mxl') |
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177 | ! |
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178 | END SUBROUTINE zdf_mxl |
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179 | |
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180 | |
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181 | SUBROUTINE zdf_mxl_kara( kt ) |
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182 | !!---------------------------------------------------------------------------------- |
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183 | !! *** ROUTINE zdf_mxl_kara *** |
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184 | ! |
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185 | ! Calculate mixed layer depth according to the definition of |
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186 | ! Kara et al, 2000, JGR, 105, 16803. |
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187 | ! |
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188 | ! If mld_type=1 the mixed layer depth is calculated as the depth at which the |
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189 | ! density has increased by an amount equivalent to a temperature difference of |
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190 | ! 0.8C at the surface. |
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191 | ! |
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192 | ! For other values of mld_type the mixed layer is calculated as the depth at |
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193 | ! which the temperature differs by 0.8C from the surface temperature. |
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194 | ! |
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195 | ! Original version: David Acreman |
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196 | ! |
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197 | !!----------------------------------------------------------------------------------- |
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198 | |
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199 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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200 | |
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201 | NAMELIST/namzdf_karaml/ ln_kara,jpmld_type, ppz_ref, ppdT_crit, & |
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202 | & ppiso_frac, ln_kara_write25h |
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203 | |
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204 | ! Local variables |
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205 | REAL, DIMENSION(jpi,jpk) :: ppzdep ! depth for use in calculating d(rho) |
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206 | REAL(wp), DIMENSION(jpi,jpj,jpts) :: ztsn_2d !Local version of tsn |
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207 | LOGICAL :: ll_found(jpi,jpj) ! Is T_b to be found by interpolation ? |
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208 | LOGICAL :: ll_belowml(jpi,jpj,jpk) ! Flag points below mixed layer when ll_found=F |
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209 | INTEGER :: ji, jj, jk ! loop counter |
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210 | INTEGER :: ik_ref(jpi,jpj) ! index of reference level |
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211 | INTEGER :: ik_iso(jpi,jpj) ! index of last uniform temp level |
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212 | REAL :: zT(jpi,jpj,jpk) ! Temperature or denisty |
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213 | REAL :: zT_ref(jpi,jpj) ! reference temperature |
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214 | REAL :: zT_b ! base temperature |
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215 | REAL :: zdTdz(jpi,jpj,jpk-2) ! gradient of zT |
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216 | REAL :: zmoddT(jpi,jpj,jpk-2) ! Absolute temperature difference |
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217 | REAL :: zdz ! depth difference |
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218 | REAL :: zdT ! temperature difference |
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219 | REAL :: zdelta_T(jpi,jpj) ! difference critereon |
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220 | REAL :: zRHO1(jpi,jpj), zRHO2(jpi,jpj) ! Densities |
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221 | INTEGER, SAVE :: idt, i_steps |
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222 | INTEGER, SAVE :: i_cnt_25h ! Counter for 25 hour means |
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223 | |
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224 | |
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225 | !!------------------------------------------------------------------------------------- |
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226 | |
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227 | IF( kt == nit000 ) THEN |
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228 | ! Default values |
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229 | ln_kara = .FALSE. |
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230 | ln_kara_write25h = .FALSE. |
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231 | jpmld_type = 1 |
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232 | ppz_ref = 10.0 |
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233 | ppdT_crit = 0.2 |
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234 | ppiso_frac = 0.1 |
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235 | ! Read namelist |
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236 | REWIND ( numnam ) |
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237 | READ ( numnam, namzdf_karaml ) |
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238 | WRITE(numout,*) '===== Kara mixed layer =====' |
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239 | WRITE(numout,*) 'ln_kara = ', ln_kara |
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240 | WRITE(numout,*) 'jpmld_type = ', jpmld_type |
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241 | WRITE(numout,*) 'ppz_ref = ', ppz_ref |
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242 | WRITE(numout,*) 'ppdT_crit = ', ppdT_crit |
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243 | WRITE(numout,*) 'ppiso_frac = ', ppiso_frac |
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244 | WRITE(numout,*) 'ln_kara_write25h = ', ln_kara_write25h |
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245 | WRITE(numout,*) '============================' |
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246 | |
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247 | IF ( .NOT.ln_kara ) THEN |
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248 | WRITE(numout,*) "ln_kara not set; Kara mixed layer not calculated" |
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249 | ELSE |
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250 | IF (.NOT. ALLOCATED(hmld_kara) ) ALLOCATE( hmld_kara(jpi,jpj) ) |
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251 | IF ( ln_kara_write25h .AND. kara_25h_init ) THEN |
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252 | i_cnt_25h = 0 |
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253 | IF (.NOT. ALLOCATED(hmld_kara_25h) ) & |
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254 | & ALLOCATE( hmld_kara_25h(jpi,jpj) ) |
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255 | hmld_kara_25h = 0._wp |
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256 | IF( nacc == 1 ) THEN |
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257 | idt = INT(rdtmin) |
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258 | ELSE |
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259 | idt = INT(rdt) |
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260 | ENDIF |
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261 | IF( MOD( 3600,idt) == 0 ) THEN |
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262 | i_steps = 3600 / idt |
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263 | ELSE |
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264 | CALL ctl_stop('STOP', & |
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265 | & 'zdf_mxl_kara: timestep must give MOD(3600,rdt)'// & |
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266 | & ' = 0 otherwise no hourly values are possible') |
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267 | ENDIF |
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268 | ENDIF |
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269 | ENDIF |
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270 | ENDIF |
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271 | |
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272 | IF ( ln_kara ) THEN |
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273 | |
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274 | !set critical ln_kara |
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275 | ztsn_2d = tsn(:,:,1,:) |
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276 | ztsn_2d(:,:,jp_tem) = ztsn_2d(:,:,jp_tem) + ppdT_crit |
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277 | |
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278 | ! Set the mixed layer depth criterion at each grid point |
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279 | ppzdep = 0._wp |
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280 | IF( jpmld_type == 1 ) THEN |
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281 | CALL eos ( tsn(:,:,1,:), & |
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282 | & ppzdep(:,:), zRHO1(:,:) ) |
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283 | CALL eos ( ztsn_2d(:,:,:), & |
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284 | & ppzdep(:,:), zRHO2(:,:) ) |
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285 | zdelta_T(:,:) = abs( zRHO1(:,:) - zRHO2(:,:) ) * rau0 |
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286 | ! RHO from eos (2d version) doesn't calculate north or east halo: |
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287 | CALL lbc_lnk( zdelta_T, 'T', 1. ) |
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288 | zT(:,:,:) = rhop(:,:,:) |
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289 | ELSE |
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290 | zdelta_T(:,:) = ppdT_crit |
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291 | zT(:,:,:) = tsn(:,:,:,jp_tem) |
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292 | ENDIF |
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293 | |
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294 | ! Calculate the gradient of zT and absolute difference for use later |
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295 | DO jk = 1 ,jpk-2 |
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296 | zdTdz(:,:,jk) = ( zT(:,:,jk+1) - zT(:,:,jk) ) / fse3w(:,:,jk+1) |
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297 | zmoddT(:,:,jk) = abs( zT(:,:,jk+1) - zT(:,:,jk) ) |
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298 | END DO |
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299 | |
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300 | ! Find density/temperature at the reference level (Kara et al use 10m). |
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301 | ! ik_ref is the index of the box centre immediately above or at the reference level |
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302 | ! Find ppz_ref in the array of model level depths and find the ref |
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303 | ! density/temperature by linear interpolation. |
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304 | ik_ref = -1 |
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305 | DO jk = jpkm1, 2, -1 |
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306 | WHERE( fsdept(:,:,jk) > ppz_ref ) |
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307 | ik_ref(:,:) = jk - 1 |
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308 | zT_ref(:,:) = zT(:,:,jk-1) + & |
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309 | & zdTdz(:,:,jk-1) * ( ppz_ref - fsdept(:,:,jk-1) ) |
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310 | ENDWHERE |
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311 | END DO |
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312 | IF ( ANY( ik_ref < 0 ) .OR. ANY( ik_ref > jpkm1 ) ) THEN |
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313 | CALL ctl_stop( "STOP", & |
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314 | & "zdf_mxl_kara: unable to find reference level for kara ML" ) |
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315 | ELSE |
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316 | ! If the first grid box centre is below the reference level then use the |
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317 | ! top model level to get zT_ref |
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318 | WHERE( fsdept(:,:,1) > ppz_ref ) |
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319 | zT_ref = zT(:,:,1) |
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320 | ik_ref = 1 |
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321 | ENDWHERE |
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322 | |
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323 | ! Search for a uniform density/temperature region where adjacent levels |
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324 | ! differ by less than ppiso_frac * deltaT. |
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325 | ! ik_iso is the index of the last level in the uniform layer |
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326 | ! ll_found indicates whether the mixed layer depth can be found by interpolation |
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327 | ik_iso(:,:) = ik_ref(:,:) |
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328 | ll_found(:,:) = .false. |
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329 | DO jj = 1, nlcj |
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330 | DO ji = 1, nlci |
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331 | !CDIR NOVECTOR |
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332 | DO jk = ik_ref(ji,jj), mbathy(ji,jj)-1 |
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333 | IF( zmoddT(ji,jj,jk) > ( ppiso_frac * zdelta_T(ji,jj) ) ) THEN |
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334 | ik_iso(ji,jj) = jk |
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335 | ll_found(ji,jj) = ( zmoddT(ji,jj,jk) > zdelta_T(ji,jj) ) |
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336 | EXIT |
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337 | ENDIF |
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338 | END DO |
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339 | END DO |
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340 | END DO |
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341 | |
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342 | ! Use linear interpolation to find depth of mixed layer base where possible |
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343 | hmld_kara(:,:) = ppz_ref |
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344 | DO jj = 1, jpj |
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345 | DO ji = 1, jpi |
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346 | IF( ll_found(ji,jj) .and. tmask(ji,jj,1) == 1.0 ) THEN |
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347 | zdz = abs( zdelta_T(ji,jj) / zdTdz(ji,jj,ik_iso(ji,jj)) ) |
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348 | hmld_kara(ji,jj) = fsdept(ji,jj,ik_iso(ji,jj)) + zdz |
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349 | ENDIF |
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350 | END DO |
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351 | END DO |
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352 | |
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353 | ! If ll_found = .false. then calculate MLD using difference of zdelta_T |
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354 | ! from the reference density/temperature |
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355 | |
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356 | ! Prevent this section from working on land points |
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357 | WHERE( tmask(:,:,1) /= 1.0 ) |
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358 | ll_found = .true. |
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359 | ENDWHERE |
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360 | |
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361 | DO jk = 1, jpk |
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362 | ll_belowml(:,:,jk) = abs( zT(:,:,jk) - zT_ref(:,:) ) >= & |
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363 | & zdelta_T(:,:) |
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364 | END DO |
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365 | |
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366 | ! Set default value where interpolation cannot be used (ll_found=false) |
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367 | DO jj = 1, jpj |
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368 | DO ji = 1, jpi |
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369 | IF( .NOT. ll_found(ji,jj) ) & |
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370 | & hmld_kara(ji,jj) = fsdept(ji,jj,mbathy(ji,jj)) |
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371 | END DO |
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372 | END DO |
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373 | |
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374 | DO jj = 1, jpj |
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375 | DO ji = 1, jpi |
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376 | !CDIR NOVECTOR |
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377 | DO jk = ik_ref(ji,jj)+1, mbathy(ji,jj) |
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378 | IF( ll_found(ji,jj) ) EXIT |
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379 | IF( ll_belowml(ji,jj,jk) ) THEN |
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380 | zT_b = zT_ref(ji,jj) + zdelta_T(ji,jj) * & |
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381 | & SIGN(1.0, zdTdz(ji,jj,jk-1) ) |
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382 | zdT = zT_b - zT(ji,jj,jk-1) |
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383 | zdz = zdT / zdTdz(ji,jj,jk-1) |
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384 | hmld_kara(ji,jj) = fsdept(ji,jj,jk-1) + zdz |
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385 | EXIT |
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386 | ENDIF |
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387 | END DO |
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388 | END DO |
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389 | END DO |
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390 | |
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391 | hmld_kara(:,:) = hmld_kara(:,:) * tmask(:,:,1) |
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392 | |
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393 | IF( ln_kara_write25h ) THEN |
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394 | !Double IF required as i_steps not defined if ln_kara_write25h = |
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395 | ! FALSE |
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396 | IF ( ( MOD( kt, i_steps ) == 0 ) .OR. kara_25h_init ) THEN |
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397 | hmld_kara_25h = hmld_kara_25h + hmld_kara |
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398 | i_cnt_25h = i_cnt_25h + 1 |
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399 | IF ( kara_25h_init ) kara_25h_init = .FALSE. |
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400 | ENDIF |
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401 | ENDIF |
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402 | |
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403 | #if defined key_iomput |
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404 | IF( kt /= nit000 ) THEN |
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405 | CALL iom_put( "mldkara" , hmld_kara ) |
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406 | IF( ( MOD( i_cnt_25h, 25) == 0 ) .AND. ln_kara_write25h ) & |
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407 | CALL iom_put( "kara25h" , ( hmld_kara_25h / 25._wp ) ) |
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408 | ENDIF |
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409 | #endif |
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410 | |
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411 | ENDIF |
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412 | ENDIF |
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413 | |
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414 | END SUBROUTINE zdf_mxl_kara |
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415 | |
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416 | !!====================================================================== |
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417 | END MODULE zdfmxl |
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