[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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[12329] | 7 | !! ! 1996-11 (E. Guilyardi) OPA8 |
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[1485] | 8 | !! ! 1997-08 (G. Madec) optimization |
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[12329] | 9 | !! ! 1999-07 (E. Guilyardi) hd28 + heat content |
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[5836] | 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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[12329] | 12 | !! 4.0.1! 2020-01 (G. Nurser) remove need for key lk_diahth |
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[1485] | 13 | !!---------------------------------------------------------------------- |
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[1577] | 14 | !! dia_hth : Compute varius diagnostics associated with the mixed layer |
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[3] | 15 | !!---------------------------------------------------------------------- |
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| 16 | USE oce ! ocean dynamics and tracers |
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| 17 | USE dom_oce ! ocean space and time domain |
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| 18 | USE phycst ! physical constants |
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[6140] | 19 | ! |
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[3] | 20 | USE in_out_manager ! I/O manager |
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[2715] | 21 | USE lib_mpp ! MPP library |
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[2528] | 22 | USE iom ! I/O library |
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[3] | 23 | |
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| 24 | IMPLICIT NONE |
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| 25 | PRIVATE |
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| 26 | |
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[2715] | 27 | PUBLIC dia_hth ! routine called by step.F90 |
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[12329] | 28 | PUBLIC dia_hth_init ! routine called by nemogcm.F90 |
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[3] | 29 | |
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[12329] | 30 | LOGICAL, PUBLIC :: ll_diahth !: Compute further diagnostics of ML and thermocline depth |
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[3] | 31 | |
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| 32 | !!---------------------------------------------------------------------- |
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[9598] | 33 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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[1152] | 34 | !! $Id$ |
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[10068] | 35 | !! Software governed by the CeCILL license (see ./LICENSE) |
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[3] | 36 | !!---------------------------------------------------------------------- |
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| 37 | CONTAINS |
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| 38 | |
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[2715] | 39 | |
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[3] | 40 | SUBROUTINE dia_hth( kt ) |
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[12329] | 41 | !!--------------------------------------------------------------------- |
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| 42 | !! *** ROUTINE dia_hth *** |
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| 43 | !! |
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| 44 | !! ** Purpose : Computes |
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| 45 | !! the mixing layer depth (turbocline): avt = 5.e-4 |
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| 46 | !! the depth of strongest vertical temperature gradient |
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| 47 | !! the mixed layer depth with density criteria: rho = rho(10m or surf) + 0.03(or 0.01) |
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| 48 | !! the mixed layer depth with temperature criteria: abs( tn - tn(10m) ) = 0.2 |
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| 49 | !! the top of the thermochine: tn = tn(10m) - ztem2 |
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| 50 | !! the pycnocline depth with density criteria equivalent to a temperature variation |
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| 51 | !! rho = rho10m + (dr/dT)(T,S,10m)*(-0.2 degC) |
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| 52 | !! the barrier layer thickness |
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| 53 | !! the maximal verical inversion of temperature and its depth max( 0, max of tn - tn(10m) ) |
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| 54 | !! the depth of the 20 degree isotherm (linear interpolation) |
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| 55 | !! the depth of the 28 degree isotherm (linear interpolation) |
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| 56 | !! the heat content of first 300 m |
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| 57 | !! |
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| 58 | !! ** Method : |
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| 59 | !!------------------------------------------------------------------- |
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| 60 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 61 | !! |
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| 62 | INTEGER :: ji, jj, jk ! dummy loop arguments |
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| 63 | INTEGER :: iid, ilevel ! temporary integers |
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| 64 | INTEGER, DIMENSION(jpi,jpj) :: ik20, ik28 ! levels |
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| 65 | REAL(wp) :: zavt5 = 5.e-4_wp ! Kz criterion for the turbocline depth |
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| 66 | REAL(wp) :: zrho3 = 0.03_wp ! density criterion for mixed layer depth |
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| 67 | REAL(wp) :: zrho1 = 0.01_wp ! density criterion for mixed layer depth |
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| 68 | REAL(wp) :: ztem2 = 0.2_wp ! temperature criterion for mixed layer depth |
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| 69 | REAL(wp) :: zthick_0, zcoef ! temporary scalars |
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| 70 | REAL(wp) :: zztmp, zzdep ! temporary scalars inside do loop |
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| 71 | REAL(wp) :: zu, zv, zw, zut, zvt ! temporary workspace |
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| 72 | REAL(wp), DIMENSION(jpi,jpj) :: zabs2 ! MLD: abs( tn - tn(10m) ) = ztem2 |
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| 73 | REAL(wp), DIMENSION(jpi,jpj) :: ztm2 ! Top of thermocline: tn = tn(10m) - ztem2 |
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| 74 | REAL(wp), DIMENSION(jpi,jpj) :: zrho10_3 ! MLD: rho = rho10m + zrho3 |
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| 75 | REAL(wp), DIMENSION(jpi,jpj) :: zpycn ! pycnocline: rho = rho10m + (dr/dT)(T,S,10m)*(-0.2 degC) |
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| 76 | REAL(wp), DIMENSION(jpi,jpj) :: ztinv ! max of temperature inversion |
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| 77 | REAL(wp), DIMENSION(jpi,jpj) :: zdepinv ! depth of temperature inversion |
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| 78 | REAL(wp), DIMENSION(jpi,jpj) :: zrho0_3 ! MLD rho = rho(surf) = 0.03 |
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| 79 | REAL(wp), DIMENSION(jpi,jpj) :: zrho0_1 ! MLD rho = rho(surf) = 0.01 |
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| 80 | REAL(wp), DIMENSION(jpi,jpj) :: zmaxdzT ! max of dT/dz |
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| 81 | REAL(wp), DIMENSION(jpi,jpj) :: zthick ! vertical integration thickness |
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| 82 | REAL(wp), DIMENSION(jpi,jpj) :: zdelr ! delta rho equivalent to deltaT = 0.2 |
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| 83 | ! note: following variables should move to local variables once iom_put is always used |
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| 84 | REAL(wp), DIMENSION(jpi,jpj) :: zhth !: depth of the max vertical temperature gradient [m] |
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| 85 | REAL(wp), DIMENSION(jpi,jpj) :: zhd20 !: depth of 20 C isotherm [m] |
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| 86 | REAL(wp), DIMENSION(jpi,jpj) :: zhd28 !: depth of 28 C isotherm [m] |
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| 87 | REAL(wp), DIMENSION(jpi,jpj) :: zhtc3 !: heat content of first 300 m [W] |
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[3] | 88 | |
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[12329] | 89 | IF (iom_use("mlddzt") .OR. iom_use("mldr0_3") .OR. iom_use("mldr0_1")) THEN |
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| 90 | ! ------------------------------------------------------------- ! |
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| 91 | ! thermocline depth: strongest vertical gradient of temperature ! |
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| 92 | ! turbocline depth (mixing layer depth): avt = zavt5 ! |
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| 93 | ! MLD: rho = rho(1) + zrho3 ! |
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| 94 | ! MLD: rho = rho(1) + zrho1 ! |
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| 95 | ! ------------------------------------------------------------- ! |
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| 96 | zmaxdzT(:,:) = 0._wp |
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| 97 | IF( nla10 > 1 ) THEN |
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| 98 | DO jj = 1, jpj |
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| 99 | DO ji = 1, jpi |
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| 100 | zztmp = gdepw_n(ji,jj,mbkt(ji,jj)+1) |
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| 101 | zrho0_3(ji,jj) = zztmp |
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| 102 | zrho0_1(ji,jj) = zztmp |
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| 103 | zhth(ji,jj) = zztmp |
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| 104 | END DO |
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| 105 | END DO |
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| 106 | ELSE IF (iom_use("mlddzt")) THEN |
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| 107 | DO jj = 1, jpj |
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| 108 | DO ji = 1, jpi |
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| 109 | zztmp = gdepw_n(ji,jj,mbkt(ji,jj)+1) |
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| 110 | zhth(ji,jj) = zztmp |
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| 111 | END DO |
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| 112 | END DO |
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| 113 | ELSE |
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| 114 | zhth(:,:) = 0._wp |
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[2715] | 115 | |
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[12329] | 116 | ENDIF |
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[2715] | 117 | |
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[12329] | 118 | DO jk = jpkm1, 2, -1 ! loop from bottom to 2 |
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| 119 | DO jj = 1, jpj |
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| 120 | DO ji = 1, jpi |
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| 121 | ! |
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| 122 | zzdep = gdepw_n(ji,jj,jk) |
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| 123 | zztmp = ( tsn(ji,jj,jk-1,jp_tem) - tsn(ji,jj,jk,jp_tem) ) / zzdep * tmask(ji,jj,jk) ! vertical gradient of temperature (dT/dz) |
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| 124 | zzdep = zzdep * tmask(ji,jj,1) |
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[3] | 125 | |
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[12329] | 126 | IF( zztmp > zmaxdzT(ji,jj) ) THEN |
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| 127 | zmaxdzT(ji,jj) = zztmp ; zhth (ji,jj) = zzdep ! max and depth of dT/dz |
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| 128 | ENDIF |
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| 129 | |
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| 130 | IF( nla10 > 1 ) THEN |
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| 131 | zztmp = rhop(ji,jj,jk) - rhop(ji,jj,1) ! delta rho(1) |
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| 132 | IF( zztmp > zrho3 ) zrho0_3(ji,jj) = zzdep ! > 0.03 |
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| 133 | IF( zztmp > zrho1 ) zrho0_1(ji,jj) = zzdep ! > 0.01 |
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| 134 | ENDIF |
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| 135 | |
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| 136 | END DO |
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| 137 | END DO |
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[12178] | 138 | END DO |
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[11141] | 139 | |
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[12329] | 140 | IF (iom_use("mlddzt")) CALL iom_put( "mlddzt", zhth*tmask(:,:,1) ) ! depth of the thermocline |
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| 141 | IF( nla10 > 1 ) THEN |
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| 142 | IF (iom_use("mldr0_3")) CALL iom_put( "mldr0_3", zrho0_3*tmask(:,:,1) ) ! MLD delta rho(surf) = 0.03 |
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| 143 | IF (iom_use("mldr0_1")) CALL iom_put( "mldr0_1", zrho0_1*tmask(:,:,1) ) ! MLD delta rho(surf) = 0.01 |
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| 144 | ENDIF |
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| 145 | ENDIF |
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[11141] | 146 | |
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[12329] | 147 | IF (iom_use("mld_dt02") .OR. iom_use("topthdep") .OR. iom_use("mldr10_3") .OR. & |
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| 148 | & iom_use("pycndep") .OR. iom_use("tinv") .OR. iom_use("depti")) THEN |
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| 149 | DO jj = 1, jpj |
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| 150 | DO ji = 1, jpi |
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| 151 | zztmp = gdepw_n(ji,jj,mbkt(ji,jj)+1) |
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| 152 | zabs2 (ji,jj) = zztmp |
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| 153 | ztm2 (ji,jj) = zztmp |
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| 154 | zrho10_3(ji,jj) = zztmp |
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| 155 | zpycn (ji,jj) = zztmp |
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| 156 | END DO |
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| 157 | END DO |
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| 158 | ztinv (:,:) = 0._wp |
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| 159 | zdepinv(:,:) = 0._wp |
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[3] | 160 | |
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[12329] | 161 | IF (iom_use("pycndep")) THEN |
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| 162 | ! Preliminary computation |
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| 163 | ! computation of zdelr = (dr/dT)(T,S,10m)*(-0.2 degC) |
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| 164 | DO jj = 1, jpj |
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| 165 | DO ji = 1, jpi |
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| 166 | IF( tmask(ji,jj,nla10) == 1. ) THEN |
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| 167 | zu = 1779.50 + 11.250 * tsn(ji,jj,nla10,jp_tem) - 3.80 * tsn(ji,jj,nla10,jp_sal) & |
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| 168 | & - 0.0745 * tsn(ji,jj,nla10,jp_tem) * tsn(ji,jj,nla10,jp_tem) & |
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| 169 | & - 0.0100 * tsn(ji,jj,nla10,jp_tem) * tsn(ji,jj,nla10,jp_sal) |
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| 170 | zv = 5891.00 + 38.000 * tsn(ji,jj,nla10,jp_tem) + 3.00 * tsn(ji,jj,nla10,jp_sal) & |
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| 171 | & - 0.3750 * tsn(ji,jj,nla10,jp_tem) * tsn(ji,jj,nla10,jp_tem) |
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| 172 | zut = 11.25 - 0.149 * tsn(ji,jj,nla10,jp_tem) - 0.01 * tsn(ji,jj,nla10,jp_sal) |
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| 173 | zvt = 38.00 - 0.750 * tsn(ji,jj,nla10,jp_tem) |
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| 174 | zw = (zu + 0.698*zv) * (zu + 0.698*zv) |
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| 175 | zdelr(ji,jj) = ztem2 * (1000.*(zut*zv - zvt*zu)/zw) |
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| 176 | ELSE |
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| 177 | zdelr(ji,jj) = 0._wp |
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| 178 | ENDIF |
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| 179 | END DO |
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| 180 | END DO |
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| 181 | ELSE |
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| 182 | zdelr(:,:) = 0._wp |
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| 183 | ENDIF |
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[1577] | 184 | |
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[12329] | 185 | ! ------------------------------------------------------------- ! |
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| 186 | ! MLD: abs( tn - tn(10m) ) = ztem2 ! |
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| 187 | ! Top of thermocline: tn = tn(10m) - ztem2 ! |
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| 188 | ! MLD: rho = rho10m + zrho3 ! |
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| 189 | ! pycnocline: rho = rho10m + (dr/dT)(T,S,10m)*(-0.2 degC) ! |
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| 190 | ! temperature inversion: max( 0, max of tn - tn(10m) ) ! |
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| 191 | ! depth of temperature inversion ! |
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| 192 | ! ------------------------------------------------------------- ! |
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| 193 | DO jk = jpkm1, nlb10, -1 ! loop from bottom to nlb10 |
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| 194 | DO jj = 1, jpj |
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| 195 | DO ji = 1, jpi |
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| 196 | ! |
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| 197 | zzdep = gdepw_n(ji,jj,jk) * tmask(ji,jj,1) |
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| 198 | ! |
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| 199 | zztmp = tsn(ji,jj,nla10,jp_tem) - tsn(ji,jj,jk,jp_tem) ! - delta T(10m) |
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| 200 | IF( ABS(zztmp) > ztem2 ) zabs2 (ji,jj) = zzdep ! abs > 0.2 |
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| 201 | IF( zztmp > ztem2 ) ztm2 (ji,jj) = zzdep ! > 0.2 |
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| 202 | zztmp = -zztmp ! delta T(10m) |
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| 203 | IF( zztmp > ztinv(ji,jj) ) THEN ! temperature inversion |
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| 204 | ztinv(ji,jj) = zztmp ; zdepinv (ji,jj) = zzdep ! max value and depth |
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| 205 | ENDIF |
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[1577] | 206 | |
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[12329] | 207 | zztmp = rhop(ji,jj,jk) - rhop(ji,jj,nla10) ! delta rho(10m) |
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| 208 | IF( zztmp > zrho3 ) zrho10_3(ji,jj) = zzdep ! > 0.03 |
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| 209 | IF( zztmp > zdelr(ji,jj) ) zpycn (ji,jj) = zzdep ! > equi. delta T(10m) - 0.2 |
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| 210 | ! |
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| 211 | END DO |
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| 212 | END DO |
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| 213 | END DO |
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[1577] | 214 | |
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[12329] | 215 | IF (iom_use("mld_dt02")) CALL iom_put( "mld_dt02", zabs2*tmask(:,:,1) ) ! MLD abs(delta t) - 0.2 |
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| 216 | IF (iom_use("topthdep")) CALL iom_put( "topthdep", ztm2*tmask(:,:,1) ) ! T(10) - 0.2 |
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| 217 | IF (iom_use("mldr10_3")) CALL iom_put( "mldr10_3", zrho10_3*tmask(:,:,1) ) ! MLD delta rho(10m) = 0.03 |
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| 218 | IF (iom_use("pycndep")) CALL iom_put( "pycndep" , zpycn*tmask(:,:,1) ) ! MLD delta rho equi. delta T(10m) = 0.2 |
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| 219 | IF (iom_use("tinv")) CALL iom_put( "tinv" , ztinv*tmask(:,:,1) ) ! max. temp. inv. (t10 ref) |
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| 220 | IF (iom_use("depti")) CALL iom_put( "depti" , zdepinv*tmask(:,:,1) ) ! depth of max. temp. inv. (t10 ref) |
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| 221 | ENDIF |
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[1577] | 222 | |
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[12329] | 223 | IF(iom_use("20d") .OR. iom_use("28d")) THEN |
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| 224 | ! ----------------------------------- ! |
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| 225 | ! search deepest level above 20C/28C ! |
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| 226 | ! ----------------------------------- ! |
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| 227 | ik20(:,:) = 1 |
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| 228 | ik28(:,:) = 1 |
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| 229 | DO jk = 1, jpkm1 ! beware temperature is not always decreasing with depth => loop from top to bottom |
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| 230 | DO jj = 1, jpj |
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| 231 | DO ji = 1, jpi |
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| 232 | zztmp = tsn(ji,jj,jk,jp_tem) |
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| 233 | IF( zztmp >= 20. ) ik20(ji,jj) = jk |
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| 234 | IF( zztmp >= 28. ) ik28(ji,jj) = jk |
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| 235 | END DO |
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| 236 | END DO |
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| 237 | END DO |
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[3] | 238 | |
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[12329] | 239 | ! --------------------------- ! |
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| 240 | ! Depth of 20C/28C isotherm ! |
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| 241 | ! --------------------------- ! |
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| 242 | DO jj = 1, jpj |
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| 243 | DO ji = 1, jpi |
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| 244 | ! |
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| 245 | zzdep = gdepw_n(ji,jj,mbkt(ji,jj)+1) ! depth of the oean bottom |
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| 246 | ! |
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| 247 | iid = ik20(ji,jj) |
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| 248 | IF( iid /= 1 ) THEN |
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| 249 | zztmp = gdept_n(ji,jj,iid ) & ! linear interpolation |
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| 250 | & + ( gdept_n(ji,jj,iid+1) - gdept_n(ji,jj,iid) ) & |
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| 251 | & * ( 20.*tmask(ji,jj,iid+1) - tsn(ji,jj,iid,jp_tem) ) & |
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| 252 | & / ( tsn(ji,jj,iid+1,jp_tem) - tsn(ji,jj,iid,jp_tem) + (1.-tmask(ji,jj,1)) ) |
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| 253 | zhd20(ji,jj) = MIN( zztmp , zzdep) * tmask(ji,jj,1) ! bound by the ocean depth |
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| 254 | ELSE |
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| 255 | zhd20(ji,jj) = 0._wp |
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| 256 | ENDIF |
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| 257 | ! |
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| 258 | iid = ik28(ji,jj) |
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| 259 | IF( iid /= 1 ) THEN |
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| 260 | zztmp = gdept_n(ji,jj,iid ) & ! linear interpolation |
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| 261 | & + ( gdept_n(ji,jj,iid+1) - gdept_n(ji,jj,iid) ) & |
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| 262 | & * ( 28.*tmask(ji,jj,iid+1) - tsn(ji,jj,iid,jp_tem) ) & |
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| 263 | & / ( tsn(ji,jj,iid+1,jp_tem) - tsn(ji,jj,iid,jp_tem) + (1.-tmask(ji,jj,1)) ) |
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| 264 | zhd28(ji,jj) = MIN( zztmp , zzdep ) * tmask(ji,jj,1) ! bound by the ocean depth |
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| 265 | ELSE |
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| 266 | zhd28(ji,jj) = 0._wp |
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| 267 | ENDIF |
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[1577] | 268 | |
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[12329] | 269 | END DO |
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| 270 | END DO |
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| 271 | CALL iom_put( "20d", zhd20 ) ! depth of the 20 isotherm |
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| 272 | CALL iom_put( "28d", zhd28 ) ! depth of the 28 isotherm |
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| 273 | ENDIF |
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[1577] | 274 | |
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[12329] | 275 | ! ----------------------------- ! |
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| 276 | ! Heat content of first 300 m ! |
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| 277 | ! ----------------------------- ! |
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| 278 | IF (iom_use("hc300")) THEN |
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| 279 | ! find ilevel with (ilevel+1) the deepest W-level above 300m (we assume we can use e3t_1d to do this search...) |
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| 280 | ilevel = 0 |
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| 281 | zthick_0 = 0._wp |
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| 282 | DO jk = 1, jpkm1 |
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| 283 | zthick_0 = zthick_0 + e3t_1d(jk) |
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| 284 | IF( zthick_0 < 300. ) ilevel = jk |
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| 285 | END DO |
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| 286 | ! surface boundary condition |
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| 287 | IF( ln_linssh ) THEN ; zthick(:,:) = sshn(:,:) ; zhtc3(:,:) = tsn(:,:,1,jp_tem) * sshn(:,:) * tmask(:,:,1) |
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| 288 | ELSE ; zthick(:,:) = 0._wp ; zhtc3(:,:) = 0._wp |
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| 289 | ENDIF |
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| 290 | ! integration down to ilevel |
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| 291 | DO jk = 1, ilevel |
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| 292 | zthick(:,:) = zthick(:,:) + e3t_n(:,:,jk) |
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| 293 | zhtc3 (:,:) = zhtc3 (:,:) + e3t_n(:,:,jk) * tsn(:,:,jk,jp_tem) * tmask(:,:,jk) |
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| 294 | END DO |
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| 295 | ! deepest layer |
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| 296 | zthick(:,:) = 300. - zthick(:,:) ! remaining thickness to reach 300m |
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| 297 | DO jj = 1, jpj |
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| 298 | DO ji = 1, jpi |
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| 299 | zhtc3(ji,jj) = zhtc3(ji,jj) + tsn(ji,jj,ilevel+1,jp_tem) & |
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| 300 | & * MIN( e3t_n(ji,jj,ilevel+1), zthick(ji,jj) ) * tmask(ji,jj,ilevel+1) |
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| 301 | END DO |
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| 302 | END DO |
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| 303 | ! from temperature to heat contain |
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| 304 | zcoef = rau0 * rcp |
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| 305 | zhtc3(:,:) = zcoef * zhtc3(:,:) |
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| 306 | CALL iom_put( "hc300", zhtc3*tmask(:,:,1) ) ! first 300m heat content |
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| 307 | ENDIF |
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| 308 | ! |
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| 309 | END SUBROUTINE dia_hth |
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[1577] | 310 | |
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| 311 | |
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[12329] | 312 | SUBROUTINE dia_hth_init |
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| 313 | !!--------------------------------------------------------------------------- |
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| 314 | !! *** ROUTINE dia_hth_init *** |
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| 315 | !! |
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| 316 | !! ** Purpose: Initialization for ML and thermocline depths |
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| 317 | !! |
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| 318 | !! ** Action : If any upper ocean diagnostic required by xml file, set in dia_hth |
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| 319 | !!--------------------------------------------------------------------------- |
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| 320 | ! |
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| 321 | IF(lwp) THEN |
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| 322 | WRITE(numout,*) |
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| 323 | WRITE(numout,*) 'dia_hth_init : heat and salt budgets diagnostics' |
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| 324 | WRITE(numout,*) '~~~~~~~~~~~~ ' |
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[12178] | 325 | ENDIF |
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[12329] | 326 | ll_diahth = iom_use("mlddzt") .OR. iom_use("mldr0_3") .OR. iom_use("mldr0_1") .OR. & |
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| 327 | & iom_use("mld_dt02") .OR. iom_use("topthdep") .OR. iom_use("mldr10_3") .OR. & |
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| 328 | & iom_use("pycndep") .OR. iom_use("tinv") .OR. iom_use("depti").OR. & |
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| 329 | & iom_use("20d") .OR. iom_use("28d") .OR. iom_use("hc300") |
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| 330 | IF(lwp) THEN |
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| 331 | WRITE(numout,*) ' output upper ocean diagnostics (T) or not (F) ll_diahth = ', ll_diahth |
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| 332 | ENDIF |
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[12178] | 333 | ! |
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[12329] | 334 | END SUBROUTINE dia_hth_init |
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[3] | 335 | END MODULE diahth |
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