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 | ! ----------------------------------- |
---|
75 | zpar0m (:,:) = qsr (:,:) * 0.43 |
---|
76 | ! AXY (22/08/14): when zpar0m = 0, zpar100 is also zero and calculating |
---|
77 | ! euphotic depth is not possible (cf. the Arctic Octopus); |
---|
78 | ! a "solution" to this is to set zpar0m to some minimal |
---|
79 | ! value such that zpar100 also has a non-zero value and |
---|
80 | ! euphotic depth can be calculated properly; note that, |
---|
81 | ! in older, non-diurnal versions of NEMO, this was much |
---|
82 | ! less of a problem; note also that, if pushed, I will |
---|
83 | ! claim that my minimal value of zpar0m refers to light |
---|
84 | ! from stars |
---|
85 | DO jj = 1, jpj |
---|
86 | DO ji = 1, jpi |
---|
87 | IF( zpar0m(ji,jj) <= 0.0 ) zpar0m(ji,jj) = 0.001 ! = 1 mW/m2 |
---|
88 | ENDDO |
---|
89 | ENDDO |
---|
90 | zpar100(:,:) = zpar0m(:,:) * 0.01 |
---|
91 | xpar (:,:,1) = zpar0m(:,:) |
---|
92 | zparr (:,:,1) = 0.5 * zpar0m(:,:) |
---|
93 | zparg (:,:,1) = 0.5 * zpar0m(:,:) |
---|
94 | |
---|
95 | |
---|
96 | ! determination of xpar |
---|
97 | ! --------------------- |
---|
98 | |
---|
99 | DO jk = 2, jpk ! determination of local par in w levels |
---|
100 | DO jj = 1, jpj |
---|
101 | DO ji = 1, jpi |
---|
102 | totchl =trn(ji,jj,jk-1,jpchn)+trn(ji,jj,jk-1,jpchd) |
---|
103 | zpig = MAX( TINY(0.), totchl/rpig) |
---|
104 | zkr = xkr0 + xkrp * EXP( xlr * LOG( zpig ) ) |
---|
105 | zkg = xkg0 + xkgp * EXP( xlg * LOG( zpig ) ) |
---|
106 | zparr(ji,jj,jk) = zparr(ji,jj,jk-1) * EXP( -zkr * fse3t(ji,jj,jk-1) ) |
---|
107 | zparg(ji,jj,jk) = zparg(ji,jj,jk-1) * EXP( -zkg * fse3t(ji,jj,jk-1) ) |
---|
108 | END DO |
---|
109 | END DO |
---|
110 | END DO |
---|
111 | |
---|
112 | DO jk = 1, jpkm1 ! mean par in t levels |
---|
113 | DO jj = 1, jpj |
---|
114 | DO ji = 1, jpi |
---|
115 | totchl =trn(ji,jj,jk ,jpchn)+trn(ji,jj,jk ,jpchd) |
---|
116 | zpig = MAX( TINY(0.), totchl/rpig) |
---|
117 | zkr = xkr0 + xkrp * EXP( xlr * LOG( zpig ) ) |
---|
118 | zkg = xkg0 + xkgp * EXP( xlg * LOG( zpig ) ) |
---|
119 | zparr(ji,jj,jk) = zparr(ji,jj,jk) / zkr / fse3t(ji,jj,jk) * ( 1 - EXP( -zkr*fse3t(ji,jj,jk) ) ) |
---|
120 | zparg(ji,jj,jk) = zparg(ji,jj,jk) / zkg / fse3t(ji,jj,jk) * ( 1 - EXP( -zkg*fse3t(ji,jj,jk) ) ) |
---|
121 | xpar (ji,jj,jk) = MAX( zparr(ji,jj,jk) + zparg(ji,jj,jk), 1.e-15 ) |
---|
122 | END DO |
---|
123 | END DO |
---|
124 | END DO |
---|
125 | |
---|
126 | ! 3. Determination of euphotic layer depth |
---|
127 | ! ---------------------------------------- |
---|
128 | |
---|
129 | ! Euphotic layer bottom level |
---|
130 | neln(:,:) = 1 ! initialisation of EL level |
---|
131 | DO jk = 1, jpkm1 |
---|
132 | DO jj = 1, jpj |
---|
133 | DO ji = 1, jpi |
---|
134 | IF( xpar(ji,jj,jk) >= zpar100(ji,jj) ) neln(ji,jj) = jk+1 ! 1rst T-level strictly below EL bottom |
---|
135 | ! ! nb. this is to ensure compatibility with |
---|
136 | ! ! nmld_trc definition in trd_mld_trc_zint |
---|
137 | END DO |
---|
138 | END DO |
---|
139 | ENDDO |
---|
140 | |
---|
141 | ! Euphotic layer depth |
---|
142 | DO jj = 1, jpj |
---|
143 | DO ji = 1, jpi |
---|
144 | xze(ji,jj) = fsdepw( ji, jj, neln(ji,jj) ) ! exact EL depth |
---|
145 | END DO |
---|
146 | ENDDO |
---|
147 | |
---|
148 | |
---|
149 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
---|
150 | WRITE(charout, FMT="('opt')") |
---|
151 | CALL prt_ctl_trc_info(charout) |
---|
152 | CALL prt_ctl_trc( tab4d=trn, mask=tmask, clinfo=ctrcnm ) |
---|
153 | ENDIF |
---|
154 | |
---|
155 | END SUBROUTINE trc_opt_medusa |
---|
156 | |
---|
157 | #else |
---|
158 | !!====================================================================== |
---|
159 | !! Dummy module : No MEDUSA bio-model |
---|
160 | !!====================================================================== |
---|
161 | CONTAINS |
---|
162 | SUBROUTINE trc_opt_medusa( kt ) ! Empty routine |
---|
163 | INTEGER, INTENT( in ) :: kt |
---|
164 | WRITE(*,*) 'trc_opt_medusa: You should not have seen this print! error?', kt |
---|
165 | END SUBROUTINE trc_opt_medusa |
---|
166 | #endif |
---|
167 | |
---|
168 | !!====================================================================== |
---|
169 | END MODULE trcopt_medusa |
---|