[934] | 1 | MODULE trcopt |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE trcopt *** |
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| 4 | !! TOP : LOBSTER 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 | !!---------------------------------------------------------------------- |
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| 12 | #if defined key_lobster |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | !! 'key_lobster' LOBSTER bio-model |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | !! trc_opt : Compute the light availability in the water column |
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| 17 | !!---------------------------------------------------------------------- |
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| 18 | USE oce_trc ! |
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[1119] | 19 | USE trc |
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[1071] | 20 | USE sms_lobster |
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[934] | 21 | USE prtctl_trc ! Print control for debbuging |
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| 22 | |
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| 23 | IMPLICIT NONE |
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| 24 | PRIVATE |
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| 25 | |
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| 26 | PUBLIC trc_opt ! called in trcprg.F90 |
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| 27 | |
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| 28 | !!* Substitution |
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| 29 | # include "domzgr_substitute.h90" |
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| 30 | !!---------------------------------------------------------------------- |
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| 31 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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[1146] | 32 | !! $Id$ |
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[934] | 33 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 34 | !!---------------------------------------------------------------------- |
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| 35 | |
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| 36 | CONTAINS |
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| 37 | |
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| 38 | SUBROUTINE trc_opt( kt ) |
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| 39 | !!--------------------------------------------------------------------- |
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| 40 | !! *** ROUTINE trc_opt *** |
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| 41 | !! |
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| 42 | !! ** Purpose : computes the light propagation in the water column |
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| 43 | !! and the euphotic layer depth |
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| 44 | !! |
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| 45 | !! ** Method : local par is computed in w layers using light propagation |
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| 46 | !! mean par in t layers are computed by integration |
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| 47 | !!--------------------------------------------------------------------- |
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| 48 | INTEGER, INTENT( in ) :: kt ! index of the time stepping |
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| 49 | INTEGER :: ji, jj, jk |
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| 50 | REAL(wp) :: zpig ! total pigment |
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| 51 | REAL(wp) :: zkr ! total absorption coefficient in red |
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| 52 | REAL(wp) :: zkg ! total absorption coefficient in green |
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| 53 | REAL(wp), DIMENSION(jpi,jpj) :: zpar100 ! irradiance at euphotic layer depth |
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| 54 | REAL(wp), DIMENSION(jpi,jpj) :: zpar0m ! irradiance just below the surface |
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| 55 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zparr, zparg ! red and green compound of par |
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| 56 | |
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| 57 | CHARACTER (len=25) :: charout |
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| 58 | !!--------------------------------------------------------------------- |
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| 59 | |
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| 60 | IF( kt == nit000 ) THEN |
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| 61 | IF(lwp) WRITE(numout,*) |
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| 62 | IF(lwp) WRITE(numout,*) ' trc_opt: LOBSTER optic-model' |
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| 63 | IF(lwp) WRITE(numout,*) ' ~~~~~~~' |
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| 64 | ENDIF |
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| 65 | |
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| 66 | ! determination of surface irradiance |
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| 67 | ! ----------------------------------- |
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| 68 | zpar0m (:,:) = qsr (:,:) * 0.43 |
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| 69 | zpar100(:,:) = zpar0m(:,:) * 0.01 |
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| 70 | xpar (:,:,1) = zpar0m(:,:) |
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| 71 | zparr (:,:,1) = 0.5 * zpar0m(:,:) |
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| 72 | zparg (:,:,1) = 0.5 * zpar0m(:,:) |
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| 73 | |
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| 74 | |
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| 75 | ! determination of xpar |
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| 76 | ! --------------------- |
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| 77 | |
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| 78 | DO jk = 2, jpk ! determination of local par in w levels |
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| 79 | DO jj = 1, jpj |
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| 80 | DO ji = 1, jpi |
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| 81 | zpig = MAX( TINY(0.), trn(ji,jj,jk-1,jpphy) ) * 12 * redf / rcchl / rpig |
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| 82 | zkr = xkr0 + xkrp * EXP( xlr * LOG( zpig ) ) |
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| 83 | zkg = xkg0 + xkgp * EXP( xlg * LOG( zpig ) ) |
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| 84 | zparr(ji,jj,jk) = zparr(ji,jj,jk-1) * EXP( -zkr * fse3t(ji,jj,jk-1) ) |
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| 85 | zparg(ji,jj,jk) = zparg(ji,jj,jk-1) * EXP( -zkg * fse3t(ji,jj,jk-1) ) |
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| 86 | END DO |
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| 87 | END DO |
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| 88 | END DO |
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| 89 | |
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| 90 | DO jk = 1, jpkm1 ! mean par in t levels |
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| 91 | DO jj = 1, jpj |
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| 92 | DO ji = 1, jpi |
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| 93 | zpig = MAX( TINY(0.), trn(ji,jj,jk,jpphy) ) * 12 * redf / rcchl / rpig |
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| 94 | zkr = xkr0 + xkrp * EXP( xlr * LOG( zpig ) ) |
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| 95 | zkg = xkg0 + xkgp * EXP( xlg * LOG( zpig ) ) |
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| 96 | zparr(ji,jj,jk) = zparr(ji,jj,jk) / zkr / fse3t(ji,jj,jk) * ( 1 - EXP( -zkr*fse3t(ji,jj,jk) ) ) |
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| 97 | zparg(ji,jj,jk) = zparg(ji,jj,jk) / zkg / fse3t(ji,jj,jk) * ( 1 - EXP( -zkg*fse3t(ji,jj,jk) ) ) |
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| 98 | xpar (ji,jj,jk) = MAX( zparr(ji,jj,jk) + zparg(ji,jj,jk), 1.e-15 ) |
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| 99 | END DO |
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| 100 | END DO |
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| 101 | END DO |
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| 102 | |
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[1176] | 103 | ! 3. Determination of euphotic layer depth |
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| 104 | ! ---------------------------------------- |
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[934] | 105 | |
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[1176] | 106 | ! Euphotic layer bottom level |
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| 107 | neln(:,:) = 1 ! initialisation of EL level |
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| 108 | DO jk = 1, jpk |
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[934] | 109 | DO jj = 1, jpj |
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[1176] | 110 | DO ji = 1, jpi |
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| 111 | IF( xpar(ji,jj,jk) >= zpar100(ji,jj) ) neln(ji,jj) = jk+1 ! 1rst T-level strictly below EL bottom |
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| 112 | ! ! nb. this is to ensure compatibility with |
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| 113 | ! ! nmld_trc definition in trd_mld_trc_zint |
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| 114 | END DO |
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[934] | 115 | END DO |
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[1176] | 116 | ENDDO |
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| 117 | |
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| 118 | ! Euphotic layer depth |
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| 119 | DO jj = 1, jpj |
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| 120 | DO ji = 1, jpi |
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| 121 | xze(ji,jj) = fsdepw( ji, jj, neln(ji,jj) ) ! exact EL depth |
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[934] | 122 | END DO |
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[1176] | 123 | ENDDO |
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[934] | 124 | |
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[1176] | 125 | |
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[934] | 126 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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| 127 | WRITE(charout, FMT="('opt')") |
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| 128 | CALL prt_ctl_trc_info(charout) |
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[1119] | 129 | CALL prt_ctl_trc( tab4d=trn, mask=tmask, clinfo=ctrcnm ) |
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[934] | 130 | ENDIF |
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| 131 | |
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| 132 | END SUBROUTINE trc_opt |
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| 133 | |
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| 134 | #else |
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| 135 | !!====================================================================== |
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| 136 | !! Dummy module : No PISCES bio-model |
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| 137 | !!====================================================================== |
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| 138 | CONTAINS |
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| 139 | SUBROUTINE trc_opt( kt ) ! Empty routine |
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| 140 | INTEGER, INTENT( in ) :: kt |
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| 141 | WRITE(*,*) 'trc_opt: You should not have seen this print! error?', kt |
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| 142 | END SUBROUTINE trc_opt |
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| 143 | #endif |
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| 144 | |
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| 145 | !!====================================================================== |
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| 146 | END MODULE trcopt |
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