[5726] | 1 | MODULE trcopt_medusa |
---|
| 2 | !!====================================================================== |
---|
| 3 | !! *** MODULE trcopt_medusa *** |
---|
| 4 | !! TOP : MEDUSA Compute the light availability in the water column |
---|
| 5 | !!====================================================================== |
---|
| 6 | !! History : - ! 1995-05 (M. Levy) Original code |
---|
| 7 | !! - ! 1999-09 (J.-M. Andre, M. Levy) |
---|
| 8 | !! - ! 1999-11 (C. Menkes, M.-A. Foujols) itabe initial |
---|
| 9 | !! - ! 2000-02 (M.A. Foujols) change x**y par exp(y*log(x)) |
---|
| 10 | !! 2.0 ! 2007-12 (C. Deltel, G. Madec) F90 |
---|
| 11 | !! - ! 2008-08 (K. Popova) adaptation for MEDUSA |
---|
| 12 | !! - ! 2008-11 (A. Yool) continuing adaptation for MEDUSA |
---|
| 13 | !! - ! 2010-03 (A. Yool) updated for branch inclusion |
---|
| 14 | !!---------------------------------------------------------------------- |
---|
| 15 | #if defined key_medusa |
---|
| 16 | !!---------------------------------------------------------------------- |
---|
| 17 | !! 'key_medusa' MEDUSA bio-model |
---|
| 18 | !!---------------------------------------------------------------------- |
---|
| 19 | !! trc_opt_medusa : Compute the light availability in the water column |
---|
| 20 | !!---------------------------------------------------------------------- |
---|
| 21 | USE oce_trc ! |
---|
| 22 | USE trc |
---|
| 23 | USE prtctl_trc ! Print control for debbuging |
---|
| 24 | USE sms_medusa |
---|
| 25 | |
---|
| 26 | IMPLICIT NONE |
---|
| 27 | PRIVATE |
---|
| 28 | |
---|
| 29 | PUBLIC trc_opt_medusa ! called in trcprg.F90 |
---|
| 30 | |
---|
| 31 | !!* Substitution |
---|
| 32 | # include "domzgr_substitute.h90" |
---|
| 33 | !!---------------------------------------------------------------------- |
---|
| 34 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
---|
| 35 | !! $Id$ |
---|
| 36 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
---|
| 37 | !!---------------------------------------------------------------------- |
---|
| 38 | |
---|
| 39 | CONTAINS |
---|
| 40 | |
---|
| 41 | SUBROUTINE trc_opt_medusa( kt ) |
---|
| 42 | !!--------------------------------------------------------------------- |
---|
| 43 | !! *** ROUTINE trc_opt_medusa *** |
---|
| 44 | !! |
---|
| 45 | !! ** Purpose : computes the light propagation in the water column |
---|
| 46 | !! and the euphotic layer depth |
---|
| 47 | !! |
---|
| 48 | !! ** Method : local par is computed in w layers using light propagation |
---|
| 49 | !! mean par in t layers are computed by integration |
---|
| 50 | !!--------------------------------------------------------------------- |
---|
| 51 | INTEGER, INTENT( in ) :: kt ! index of the time stepping |
---|
| 52 | INTEGER :: ji, jj, jk |
---|
| 53 | REAL(wp) :: zpig ! total pigment |
---|
| 54 | REAL(wp) :: zkr ! total absorption coefficient in red |
---|
| 55 | REAL(wp) :: zkg ! total absorption coefficient in green |
---|
| 56 | REAL(wp) :: totchl ! total Chl concentreation |
---|
| 57 | REAL(wp), DIMENSION(jpi,jpj) :: zpar100 ! irradiance at euphotic layer depth |
---|
| 58 | REAL(wp), DIMENSION(jpi,jpj) :: zpar0m ! irradiance just below the surface |
---|
| 59 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zparr, zparg ! red and green compound of par |
---|
| 60 | |
---|
| 61 | CHARACTER (len=25) :: charout |
---|
| 62 | !!--------------------------------------------------------------------- |
---|
| 63 | |
---|
| 64 | !! AXY (20/11/14): alter this to report on first MEDUSA call |
---|
| 65 | !! IF( kt == nit000 ) THEN |
---|
| 66 | IF( kt == nittrc000 ) THEN |
---|
| 67 | IF(lwp) WRITE(numout,*) |
---|
| 68 | IF(lwp) WRITE(numout,*) ' trc_opt_medusa: MEDUSA optic-model' |
---|
| 69 | IF(lwp) WRITE(numout,*) ' ~~~~~~~' |
---|
| 70 | IF(lwp) WRITE(numout,*) ' kt =',kt |
---|
| 71 | ENDIF |
---|
| 72 | |
---|
| 73 | ! determination of surface irradiance |
---|
| 74 | ! ----------------------------------- |
---|
[6639] | 75 | ! AXY (23/07/15): the inclusion of empirical DMS calculations requires |
---|
| 76 | ! daily averages of a series of properties that are |
---|
| 77 | ! used as inputs; these include surface irradiance; |
---|
| 78 | ! here, this is taken advantage of to allow MEDUSA to |
---|
| 79 | ! base its submarine light field on daily average |
---|
| 80 | ! rather than "instantaneous" irradiance; largely |
---|
| 81 | ! because MEDUSA was originally formulated to work |
---|
| 82 | ! with diel average irradiance rather than a diel |
---|
| 83 | ! cycle; using key_avgqsr_medusa activates this |
---|
| 84 | ! functionality, while its absence gives default |
---|
| 85 | ! MEDUSA (which is whatever is supplied by NEMO) |
---|
| 86 | # if defined key_avgqsr_medusa |
---|
| 87 | ! surface irradiance input is rolling average irradiance |
---|
| 88 | zpar0m (:,:) = zn_dms_qsr(:,:) * 0.43 |
---|
| 89 | # else |
---|
| 90 | ! surface irradiance input is instantaneous irradiance |
---|
| 91 | zpar0m (:,:) = qsr(:,:) * 0.43 |
---|
| 92 | # endif |
---|
[5726] | 93 | ! AXY (22/08/14): when zpar0m = 0, zpar100 is also zero and calculating |
---|
| 94 | ! euphotic depth is not possible (cf. the Arctic Octopus); |
---|
| 95 | ! a "solution" to this is to set zpar0m to some minimal |
---|
| 96 | ! value such that zpar100 also has a non-zero value and |
---|
| 97 | ! euphotic depth can be calculated properly; note that, |
---|
| 98 | ! in older, non-diurnal versions of NEMO, this was much |
---|
| 99 | ! less of a problem; note also that, if pushed, I will |
---|
| 100 | ! claim that my minimal value of zpar0m refers to light |
---|
| 101 | ! from stars |
---|
| 102 | DO jj = 1, jpj |
---|
| 103 | DO ji = 1, jpi |
---|
| 104 | IF( zpar0m(ji,jj) <= 0.0 ) zpar0m(ji,jj) = 0.001 ! = 1 mW/m2 |
---|
| 105 | ENDDO |
---|
| 106 | ENDDO |
---|
| 107 | zpar100(:,:) = zpar0m(:,:) * 0.01 |
---|
| 108 | xpar (:,:,1) = zpar0m(:,:) |
---|
| 109 | zparr (:,:,1) = 0.5 * zpar0m(:,:) |
---|
| 110 | zparg (:,:,1) = 0.5 * zpar0m(:,:) |
---|
| 111 | |
---|
| 112 | ! determination of xpar |
---|
| 113 | ! --------------------- |
---|
| 114 | |
---|
| 115 | DO jk = 2, jpk ! determination of local par in w levels |
---|
| 116 | DO jj = 1, jpj |
---|
| 117 | DO ji = 1, jpi |
---|
| 118 | totchl =trn(ji,jj,jk-1,jpchn)+trn(ji,jj,jk-1,jpchd) |
---|
| 119 | zpig = MAX( TINY(0.), totchl/rpig) |
---|
| 120 | zkr = xkr0 + xkrp * EXP( xlr * LOG( zpig ) ) |
---|
| 121 | zkg = xkg0 + xkgp * EXP( xlg * LOG( zpig ) ) |
---|
| 122 | zparr(ji,jj,jk) = zparr(ji,jj,jk-1) * EXP( -zkr * fse3t(ji,jj,jk-1) ) |
---|
| 123 | zparg(ji,jj,jk) = zparg(ji,jj,jk-1) * EXP( -zkg * fse3t(ji,jj,jk-1) ) |
---|
| 124 | END DO |
---|
| 125 | END DO |
---|
| 126 | END DO |
---|
| 127 | |
---|
| 128 | DO jk = 1, jpkm1 ! mean par in t levels |
---|
| 129 | DO jj = 1, jpj |
---|
| 130 | DO ji = 1, jpi |
---|
| 131 | totchl =trn(ji,jj,jk ,jpchn)+trn(ji,jj,jk ,jpchd) |
---|
| 132 | zpig = MAX( TINY(0.), totchl/rpig) |
---|
| 133 | zkr = xkr0 + xkrp * EXP( xlr * LOG( zpig ) ) |
---|
| 134 | zkg = xkg0 + xkgp * EXP( xlg * LOG( zpig ) ) |
---|
| 135 | zparr(ji,jj,jk) = zparr(ji,jj,jk) / zkr / fse3t(ji,jj,jk) * ( 1 - EXP( -zkr*fse3t(ji,jj,jk) ) ) |
---|
| 136 | zparg(ji,jj,jk) = zparg(ji,jj,jk) / zkg / fse3t(ji,jj,jk) * ( 1 - EXP( -zkg*fse3t(ji,jj,jk) ) ) |
---|
| 137 | xpar (ji,jj,jk) = MAX( zparr(ji,jj,jk) + zparg(ji,jj,jk), 1.e-15 ) |
---|
| 138 | END DO |
---|
| 139 | END DO |
---|
| 140 | END DO |
---|
| 141 | |
---|
| 142 | ! 3. Determination of euphotic layer depth |
---|
| 143 | ! ---------------------------------------- |
---|
| 144 | |
---|
| 145 | ! Euphotic layer bottom level |
---|
| 146 | neln(:,:) = 1 ! initialisation of EL level |
---|
| 147 | DO jk = 1, jpkm1 |
---|
| 148 | DO jj = 1, jpj |
---|
| 149 | DO ji = 1, jpi |
---|
| 150 | IF( xpar(ji,jj,jk) >= zpar100(ji,jj) ) neln(ji,jj) = jk+1 ! 1rst T-level strictly below EL bottom |
---|
| 151 | ! ! nb. this is to ensure compatibility with |
---|
| 152 | ! ! nmld_trc definition in trd_mld_trc_zint |
---|
| 153 | END DO |
---|
| 154 | END DO |
---|
| 155 | ENDDO |
---|
| 156 | |
---|
| 157 | ! Euphotic layer depth |
---|
| 158 | DO jj = 1, jpj |
---|
| 159 | DO ji = 1, jpi |
---|
| 160 | xze(ji,jj) = fsdepw( ji, jj, neln(ji,jj) ) ! exact EL depth |
---|
| 161 | END DO |
---|
| 162 | ENDDO |
---|
| 163 | |
---|
| 164 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
---|
| 165 | WRITE(charout, FMT="('opt')") |
---|
| 166 | CALL prt_ctl_trc_info(charout) |
---|
| 167 | CALL prt_ctl_trc( tab4d=trn, mask=tmask, clinfo=ctrcnm ) |
---|
| 168 | ENDIF |
---|
| 169 | |
---|
| 170 | END SUBROUTINE trc_opt_medusa |
---|
| 171 | |
---|
| 172 | #else |
---|
| 173 | !!====================================================================== |
---|
| 174 | !! Dummy module : No MEDUSA bio-model |
---|
| 175 | !!====================================================================== |
---|
| 176 | CONTAINS |
---|
| 177 | SUBROUTINE trc_opt_medusa( kt ) ! Empty routine |
---|
| 178 | INTEGER, INTENT( in ) :: kt |
---|
| 179 | WRITE(*,*) 'trc_opt_medusa: You should not have seen this print! error?', kt |
---|
| 180 | END SUBROUTINE trc_opt_medusa |
---|
| 181 | #endif |
---|
| 182 | |
---|
| 183 | !!====================================================================== |
---|
| 184 | END MODULE trcopt_medusa |
---|