[5726] | 1 | MODULE trcopt_medusa |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE trcopt_medusa *** |
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| 4 | !! TOP : MEDUSA Compute the light availability in the water column |
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| 5 | !!====================================================================== |
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| 6 | !! History : - ! 1995-05 (M. Levy) Original code |
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| 7 | !! - ! 1999-09 (J.-M. Andre, M. Levy) |
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| 8 | !! - ! 1999-11 (C. Menkes, M.-A. Foujols) itabe initial |
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| 9 | !! - ! 2000-02 (M.A. Foujols) change x**y par exp(y*log(x)) |
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| 10 | !! 2.0 ! 2007-12 (C. Deltel, G. Madec) F90 |
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| 11 | !! - ! 2008-08 (K. Popova) adaptation for MEDUSA |
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| 12 | !! - ! 2008-11 (A. Yool) continuing adaptation for MEDUSA |
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| 13 | !! - ! 2010-03 (A. Yool) updated for branch inclusion |
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[7894] | 14 | !! - ! 2014-08 (A. Yool) correct 1% light level calculation |
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| 15 | !! - ! 2015-07 (A. Yool) updated for temporal averaging |
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| 16 | !! - ! 2017-03 (Jpalm) correct euphotic layer |
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[5726] | 17 | !!---------------------------------------------------------------------- |
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| 18 | #if defined key_medusa |
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| 19 | !!---------------------------------------------------------------------- |
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| 20 | !! 'key_medusa' MEDUSA bio-model |
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| 21 | !!---------------------------------------------------------------------- |
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| 22 | !! trc_opt_medusa : Compute the light availability in the water column |
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| 23 | !!---------------------------------------------------------------------- |
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| 24 | USE oce_trc ! |
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| 25 | USE trc |
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| 26 | USE prtctl_trc ! Print control for debbuging |
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| 27 | USE sms_medusa |
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| 28 | |
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| 29 | IMPLICIT NONE |
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| 30 | PRIVATE |
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| 31 | |
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| 32 | PUBLIC trc_opt_medusa ! called in trcprg.F90 |
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| 33 | |
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| 34 | !!* Substitution |
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| 35 | # include "domzgr_substitute.h90" |
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| 36 | !!---------------------------------------------------------------------- |
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| 37 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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| 38 | !! $Id$ |
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| 39 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 40 | !!---------------------------------------------------------------------- |
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| 41 | |
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| 42 | CONTAINS |
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| 43 | |
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| 44 | SUBROUTINE trc_opt_medusa( kt ) |
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| 45 | !!--------------------------------------------------------------------- |
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| 46 | !! *** ROUTINE trc_opt_medusa *** |
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| 47 | !! |
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| 48 | !! ** Purpose : computes the light propagation in the water column |
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| 49 | !! and the euphotic layer depth |
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| 50 | !! |
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| 51 | !! ** Method : local par is computed in w layers using light propagation |
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| 52 | !! mean par in t layers are computed by integration |
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| 53 | !!--------------------------------------------------------------------- |
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| 54 | INTEGER, INTENT( in ) :: kt ! index of the time stepping |
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| 55 | INTEGER :: ji, jj, jk |
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| 56 | REAL(wp) :: zpig ! total pigment |
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| 57 | REAL(wp) :: zkr ! total absorption coefficient in red |
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| 58 | REAL(wp) :: zkg ! total absorption coefficient in green |
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| 59 | REAL(wp) :: totchl ! total Chl concentreation |
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| 60 | REAL(wp), DIMENSION(jpi,jpj) :: zpar100 ! irradiance at euphotic layer depth |
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| 61 | REAL(wp), DIMENSION(jpi,jpj) :: zpar0m ! irradiance just below the surface |
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| 62 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zparr, zparg ! red and green compound of par |
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| 63 | |
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| 64 | CHARACTER (len=25) :: charout |
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| 65 | !!--------------------------------------------------------------------- |
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| 66 | |
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| 67 | !! AXY (20/11/14): alter this to report on first MEDUSA call |
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| 68 | !! IF( kt == nit000 ) THEN |
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| 69 | IF( kt == nittrc000 ) THEN |
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| 70 | IF(lwp) WRITE(numout,*) |
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| 71 | IF(lwp) WRITE(numout,*) ' trc_opt_medusa: MEDUSA optic-model' |
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| 72 | IF(lwp) WRITE(numout,*) ' ~~~~~~~' |
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| 73 | IF(lwp) WRITE(numout,*) ' kt =',kt |
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| 74 | ENDIF |
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| 75 | |
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| 76 | ! determination of surface irradiance |
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| 77 | ! ----------------------------------- |
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[5841] | 78 | ! AXY (23/07/15): the inclusion of empirical DMS calculations requires |
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| 79 | ! daily averages of a series of properties that are |
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| 80 | ! used as inputs; these include surface irradiance; |
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| 81 | ! here, this is taken advantage of to allow MEDUSA to |
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| 82 | ! base its submarine light field on daily average |
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| 83 | ! rather than "instantaneous" irradiance; largely |
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| 84 | ! because MEDUSA was originally formulated to work |
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| 85 | ! with diel average irradiance rather than a diel |
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| 86 | ! cycle; using key_avgqsr_medusa activates this |
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| 87 | ! functionality, while its absence gives default |
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| 88 | ! MEDUSA (which is whatever is supplied by NEMO) |
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| 89 | # if defined key_avgqsr_medusa |
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| 90 | ! surface irradiance input is rolling average irradiance |
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| 91 | zpar0m (:,:) = zn_dms_qsr(:,:) * 0.43 |
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| 92 | # else |
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| 93 | ! surface irradiance input is instantaneous irradiance |
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| 94 | zpar0m (:,:) = qsr(:,:) * 0.43 |
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| 95 | # endif |
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[5726] | 96 | ! AXY (22/08/14): when zpar0m = 0, zpar100 is also zero and calculating |
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| 97 | ! euphotic depth is not possible (cf. the Arctic Octopus); |
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| 98 | ! a "solution" to this is to set zpar0m to some minimal |
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| 99 | ! value such that zpar100 also has a non-zero value and |
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| 100 | ! euphotic depth can be calculated properly; note that, |
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| 101 | ! in older, non-diurnal versions of NEMO, this was much |
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| 102 | ! less of a problem; note also that, if pushed, I will |
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| 103 | ! claim that my minimal value of zpar0m refers to light |
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| 104 | ! from stars |
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| 105 | DO jj = 1, jpj |
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| 106 | DO ji = 1, jpi |
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| 107 | IF( zpar0m(ji,jj) <= 0.0 ) zpar0m(ji,jj) = 0.001 ! = 1 mW/m2 |
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| 108 | ENDDO |
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| 109 | ENDDO |
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| 110 | zpar100(:,:) = zpar0m(:,:) * 0.01 |
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| 111 | xpar (:,:,1) = zpar0m(:,:) |
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| 112 | zparr (:,:,1) = 0.5 * zpar0m(:,:) |
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| 113 | zparg (:,:,1) = 0.5 * zpar0m(:,:) |
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| 114 | |
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| 115 | ! determination of xpar |
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| 116 | ! --------------------- |
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| 117 | |
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| 118 | DO jk = 2, jpk ! determination of local par in w levels |
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| 119 | DO jj = 1, jpj |
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| 120 | DO ji = 1, jpi |
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| 121 | totchl =trn(ji,jj,jk-1,jpchn)+trn(ji,jj,jk-1,jpchd) |
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| 122 | zpig = MAX( TINY(0.), totchl/rpig) |
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| 123 | zkr = xkr0 + xkrp * EXP( xlr * LOG( zpig ) ) |
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| 124 | zkg = xkg0 + xkgp * EXP( xlg * LOG( zpig ) ) |
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| 125 | zparr(ji,jj,jk) = zparr(ji,jj,jk-1) * EXP( -zkr * fse3t(ji,jj,jk-1) ) |
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| 126 | zparg(ji,jj,jk) = zparg(ji,jj,jk-1) * EXP( -zkg * fse3t(ji,jj,jk-1) ) |
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| 127 | END DO |
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| 128 | END DO |
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| 129 | END DO |
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| 130 | |
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| 131 | DO jk = 1, jpkm1 ! mean par in t levels |
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| 132 | DO jj = 1, jpj |
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| 133 | DO ji = 1, jpi |
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| 134 | totchl =trn(ji,jj,jk ,jpchn)+trn(ji,jj,jk ,jpchd) |
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| 135 | zpig = MAX( TINY(0.), totchl/rpig) |
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| 136 | zkr = xkr0 + xkrp * EXP( xlr * LOG( zpig ) ) |
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| 137 | zkg = xkg0 + xkgp * EXP( xlg * LOG( zpig ) ) |
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| 138 | zparr(ji,jj,jk) = zparr(ji,jj,jk) / zkr / fse3t(ji,jj,jk) * ( 1 - EXP( -zkr*fse3t(ji,jj,jk) ) ) |
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| 139 | zparg(ji,jj,jk) = zparg(ji,jj,jk) / zkg / fse3t(ji,jj,jk) * ( 1 - EXP( -zkg*fse3t(ji,jj,jk) ) ) |
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| 140 | xpar (ji,jj,jk) = MAX( zparr(ji,jj,jk) + zparg(ji,jj,jk), 1.e-15 ) |
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| 141 | END DO |
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| 142 | END DO |
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| 143 | END DO |
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| 144 | |
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| 145 | ! 3. Determination of euphotic layer depth |
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| 146 | ! ---------------------------------------- |
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| 147 | |
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| 148 | ! Euphotic layer bottom level |
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| 149 | neln(:,:) = 1 ! initialisation of EL level |
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| 150 | DO jk = 1, jpkm1 |
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| 151 | DO jj = 1, jpj |
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| 152 | DO ji = 1, jpi |
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| 153 | IF( xpar(ji,jj,jk) >= zpar100(ji,jj) ) neln(ji,jj) = jk+1 ! 1rst T-level strictly below EL bottom |
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| 154 | ! ! nb. this is to ensure compatibility with |
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| 155 | ! ! nmld_trc definition in trd_mld_trc_zint |
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| 156 | END DO |
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| 157 | END DO |
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| 158 | ENDDO |
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| 159 | |
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| 160 | ! Euphotic layer depth |
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[7766] | 161 | !! Jpalm -- 06-03-2017 -- add init xze, to avoid halo problems within the |
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| 162 | !! writing process |
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| 163 | xze(:,:) = 0.0 |
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[5726] | 164 | DO jj = 1, jpj |
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| 165 | DO ji = 1, jpi |
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| 166 | xze(ji,jj) = fsdepw( ji, jj, neln(ji,jj) ) ! exact EL depth |
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| 167 | END DO |
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| 168 | ENDDO |
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| 169 | |
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| 170 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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| 171 | WRITE(charout, FMT="('opt')") |
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| 172 | CALL prt_ctl_trc_info(charout) |
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| 173 | CALL prt_ctl_trc( tab4d=trn, mask=tmask, clinfo=ctrcnm ) |
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| 174 | ENDIF |
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| 175 | |
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| 176 | END SUBROUTINE trc_opt_medusa |
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| 177 | |
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| 178 | #else |
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| 179 | !!====================================================================== |
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| 180 | !! Dummy module : No MEDUSA bio-model |
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| 181 | !!====================================================================== |
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| 182 | CONTAINS |
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| 183 | SUBROUTINE trc_opt_medusa( kt ) ! Empty routine |
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| 184 | INTEGER, INTENT( in ) :: kt |
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| 185 | WRITE(*,*) 'trc_opt_medusa: You should not have seen this print! error?', kt |
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| 186 | END SUBROUTINE trc_opt_medusa |
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| 187 | #endif |
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| 188 | |
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| 189 | !!====================================================================== |
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| 190 | END MODULE trcopt_medusa |
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