[3] | 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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[1485] | 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 | !! 8.5 ! 2002-06 (G. Madec) F90: Free form and module |
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| 11 | !! NEMO 3.2 ! 2009-07 (S. Masson) hc300 bugfix + cleaning |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | |
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[3] | 14 | #if defined key_diahth || defined key_esopa |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | !! 'key_diahth' : thermocline depth diag. |
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| 17 | !!---------------------------------------------------------------------- |
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| 18 | !! dia_hth : Compute diagnostics associated with the thermocline |
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| 19 | !!---------------------------------------------------------------------- |
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| 20 | !! * Modules used |
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| 21 | USE oce ! ocean dynamics and tracers |
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| 22 | USE dom_oce ! ocean space and time domain |
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| 23 | USE phycst ! physical constants |
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| 24 | USE in_out_manager ! I/O manager |
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[1482] | 25 | USE iom |
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[3] | 26 | |
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| 27 | IMPLICIT NONE |
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| 28 | PRIVATE |
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| 29 | |
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| 30 | !! * Routine accessibility |
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| 31 | PUBLIC dia_hth ! routine called by step.F90 |
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| 32 | |
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| 33 | !! * Shared module variables |
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[32] | 34 | LOGICAL , PUBLIC, PARAMETER :: lk_diahth = .TRUE. !: thermocline-20d depths flag |
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| 35 | REAL(wp), PUBLIC, DIMENSION(jpi,jpj) :: & !: |
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| 36 | hth , & !: depth of the max vertical temperature gradient (m) |
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| 37 | hd20 , & !: depth of 20 C isotherm (m) |
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| 38 | hd28 , & !: depth of 28 C isotherm (m) |
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| 39 | htc3 !: heat content of first 300 m |
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[3] | 40 | |
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| 41 | !! * Substitutions |
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| 42 | # include "domzgr_substitute.h90" |
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| 43 | !!---------------------------------------------------------------------- |
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[1485] | 44 | !! NEMO/OPA 3.2 , LOCEAN-IPSL (2009) |
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[1152] | 45 | !! $Id$ |
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[1485] | 46 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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[3] | 47 | !!---------------------------------------------------------------------- |
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| 48 | |
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| 49 | CONTAINS |
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| 50 | |
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| 51 | SUBROUTINE dia_hth( kt ) |
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| 52 | !!--------------------------------------------------------------------- |
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| 53 | !! *** ROUTINE dia_hth *** |
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| 54 | !! |
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| 55 | !! ** Purpose : |
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| 56 | !! Computes the depth of strongest vertical temperature gradient |
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| 57 | !! Computes the depth of the 20 degree isotherm |
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| 58 | !! Computes the depth of the 28 degree isotherm |
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| 59 | !! Computes the heat content of first 300 m |
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| 60 | !! |
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| 61 | !! ** Method : |
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| 62 | !! |
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| 63 | !!------------------------------------------------------------------- |
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| 64 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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[1485] | 65 | !! |
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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,jpj) :: ikc ! levels |
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| 69 | REAL(wp) :: zd, zthick_0, zcoef ! temporary scalars |
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| 70 | REAL(wp), DIMENSION(jpi,jpj) :: zthick |
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| 71 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zdzt |
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[3] | 72 | !!---------------------------------------------------------------------- |
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| 73 | |
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| 74 | IF( kt == nit000 ) THEN |
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| 75 | IF(lwp) WRITE(numout,*) |
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| 76 | IF(lwp) WRITE(numout,*) 'dia_hth : diagnostics of the thermocline depth' |
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| 77 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 78 | IF(lwp) WRITE(numout,*) |
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| 79 | ENDIF |
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| 80 | |
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| 81 | ! -------------------------- ! |
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| 82 | ! Depth of the thermocline ! |
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| 83 | ! -------------------------- ! |
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| 84 | ! The depth of the thermocline is defined as the depth of the |
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| 85 | ! strongest vertical temperature gradient |
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[1485] | 86 | zdzt(:,:,1) = 0.e0 |
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| 87 | DO jk = 2, jpk ! vertical gradient of temperature |
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| 88 | zdzt(:,:,jk) = ( tn(:,:,jk-1) - tn(:,:,jk) ) / fse3w(:,:,jk) * tmask(:,:,jk) |
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| 89 | END DO |
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[3] | 90 | DO jj = 1, jpj |
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| 91 | DO ji = 1, jpi |
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[1485] | 92 | ilevel = MAXLOC( zdzt(ji,jj,:), dim= 1 ) ! level of maximum vertical temperature gradient |
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| 93 | hth(ji,jj) = fsdepw(ji,jj,ilevel) ! depth of the thermocline |
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| 94 | END DO |
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[3] | 95 | END DO |
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| 96 | |
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[1485] | 97 | CALL iom_put( "thermod", hth ) ! depth of the thermocline |
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[3] | 98 | |
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| 99 | ! ----------------------- ! |
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| 100 | ! Depth of 20C isotherm ! |
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| 101 | ! ----------------------- ! |
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| 102 | |
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[1485] | 103 | ! search last level above 20C |
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| 104 | ikc(:,:) = COUNT( tn >= 20., dim = 3 ) |
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| 105 | ! Depth of 20C isotherm, linear interpolation |
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[3] | 106 | DO jj = 1, jpj |
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| 107 | DO ji = 1, jpi |
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[1485] | 108 | iid = MAX(1, ikc(ji,jj)) |
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| 109 | zd = fsdept(ji,jj,iid) + ( fsdept(ji,jj,iid+1) - fsdept(ji,jj,iid) ) & |
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| 110 | & * ( 20.*tmask(ji,jj,iid+1) - tn(ji,jj,iid) ) & |
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| 111 | & / ( tn(ji,jj,iid+1) - tn(ji,jj,iid) + ( 1. - tmask(ji,jj,1) ) ) |
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| 112 | ! bound by the ocean depth, minimum value, first T-point depth |
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[3] | 113 | iif = mbathy(ji,jj) |
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[1485] | 114 | hd20(ji,jj) = MIN( zd*tmask(ji,jj,1), fsdepw(ji,jj,iif) ) |
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[3] | 115 | END DO |
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| 116 | END DO |
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[1485] | 117 | WHERE(ikc == 0 ) hd20 = 0.e0 |
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| 118 | CALL iom_put( "20d", hd20 ) ! depth of the 20 isotherm |
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[3] | 119 | |
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| 120 | ! ----------------------- ! |
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| 121 | ! Depth of 28C isotherm ! |
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| 122 | ! ----------------------- ! |
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| 123 | |
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[1485] | 124 | ! search last level above 28C |
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| 125 | ikc(:,:) = COUNT( tn >= 28., dim = 3 ) |
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| 126 | ! Depth of 28C isotherm, linear interpolation |
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[3] | 127 | DO jj = 1, jpj |
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| 128 | DO ji = 1, jpi |
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[1485] | 129 | iid = MAX(1, ikc(ji,jj)) |
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| 130 | zd = fsdept(ji,jj,iid) + ( fsdept(ji,jj,iid+1) - fsdept(ji,jj,iid) ) & |
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| 131 | & * ( 28.*tmask(ji,jj,iid+1) - tn(ji,jj,iid) ) & |
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| 132 | & / ( tn(ji,jj,iid+1) - tn(ji,jj,iid) + ( 1. - tmask(ji,jj,1) ) ) |
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| 133 | ! bound by the ocean depth, minimum value, first T-point depth |
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[3] | 134 | iif = mbathy(ji,jj) |
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[1485] | 135 | hd28(ji,jj) = MIN( zd*tmask(ji,jj,1), fsdepw(ji,jj,iif) ) |
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[3] | 136 | END DO |
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| 137 | END DO |
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[1485] | 138 | WHERE(ikc == 0 ) hd28 = 0.e0 |
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| 139 | CALL iom_put( "28d", hd28 ) ! depth of the 28 isotherm |
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[3] | 140 | |
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[1485] | 141 | ! ----------------------------- ! |
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| 142 | ! Heat content of first 300 m ! |
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| 143 | ! ----------------------------- ! |
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[3] | 144 | |
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[1484] | 145 | ! 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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| 146 | ilevel = 0 |
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| 147 | zthick_0 = 0.e0 |
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| 148 | DO jk = 1, jpk-1 |
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| 149 | zthick_0 = zthick_0 + e3t_0(jk) |
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| 150 | IF( zthick_0 < 300. ) ilevel = jk |
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| 151 | END DO |
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| 152 | ! surface boundary condition |
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| 153 | IF( lk_vvl ) THEN ; zthick(:,:) = 0.e0 ; htc3(:,:) = 0.e0 |
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| 154 | ELSE ; zthick(:,:) = sshn(:,:) ; htc3(:,:) = tn(:,:,jk) * sshn(:,:) * tmask(:,:,jk) |
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| 155 | ENDIF |
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| 156 | ! integration down to ilevel |
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[3] | 157 | DO jk = 1, ilevel |
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[1484] | 158 | zthick(:,:) = zthick(:,:) + fse3t(:,:,jk) |
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| 159 | htc3 (:,:) = htc3 (:,:) + fse3t(:,:,jk) * tn(:,:,jk) * tmask(:,:,jk) |
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[3] | 160 | END DO |
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[1484] | 161 | ! deepest layer |
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| 162 | zthick(:,:) = 300. - zthick(:,:) ! remaining thickness to reach 300m |
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| 163 | htc3(:,:) = htc3(:,:) + tn(:,:,ilevel+1) * MIN( fse3t(:,:,ilevel+1), zthick(:,:) ) * tmask(:,:,ilevel+1) |
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| 164 | ! from temperature to heat contain |
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| 165 | zcoef = rau0 * rcp |
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| 166 | htc3(:,:) = zcoef * htc3(:,:) |
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[1485] | 167 | CALL iom_put( "hc300", htc3 ) ! first 300m heaat content |
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[3] | 168 | |
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[1485] | 169 | |
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[3] | 170 | END SUBROUTINE dia_hth |
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| 171 | |
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| 172 | #else |
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| 173 | !!---------------------------------------------------------------------- |
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| 174 | !! Default option : Empty module |
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| 175 | !!---------------------------------------------------------------------- |
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[32] | 176 | LOGICAL , PUBLIC, PARAMETER :: lk_diahth = .FALSE. !: thermocline-20d depths flag |
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[3] | 177 | CONTAINS |
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| 178 | SUBROUTINE dia_hth( kt ) ! Empty routine |
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[32] | 179 | WRITE(*,*) 'dia_hth: You should not have seen this print! error?', kt |
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[3] | 180 | END SUBROUTINE dia_hth |
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| 181 | #endif |
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| 182 | |
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| 183 | !!====================================================================== |
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| 184 | END MODULE diahth |
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