1 | MODULE trcsbc |
---|
2 | !!============================================================================== |
---|
3 | !! *** MODULE trcsbc *** |
---|
4 | !! Ocean passive tracers: surface boundary condition |
---|
5 | !!====================================================================== |
---|
6 | !! History : 8.2 ! 1998-10 (G. Madec, G. Roullet, M. Imbard) Original code |
---|
7 | !! 8.2 ! 2001-02 (D. Ludicone) sea ice and free surface |
---|
8 | !! 8.5 ! 2002-06 (G. Madec) F90: Free form and module |
---|
9 | !! 9.0 ! 2004-03 (C. Ethe) adapted for passive tracers |
---|
10 | !! ! 2006-08 (C. Deltel) Diagnose ML trends for passive tracers |
---|
11 | !!============================================================================== |
---|
12 | #if defined key_top |
---|
13 | !!---------------------------------------------------------------------- |
---|
14 | !! 'key_top' TOP models |
---|
15 | !!---------------------------------------------------------------------- |
---|
16 | !! trc_sbc : update the tracer trend at ocean surface |
---|
17 | !!---------------------------------------------------------------------- |
---|
18 | USE oce_trc ! ocean dynamics and active tracers variables |
---|
19 | USE trc ! ocean passive tracers variables |
---|
20 | USE prtctl_trc ! Print control for debbuging |
---|
21 | USE trdmod_oce |
---|
22 | USE trdtra |
---|
23 | |
---|
24 | IMPLICIT NONE |
---|
25 | PRIVATE |
---|
26 | |
---|
27 | PUBLIC trc_sbc ! routine called by step.F90 |
---|
28 | !AM< |
---|
29 | INTEGER, SAVE, DIMENSION(jptra) :: jn_tremp ! tracer factors for emp |
---|
30 | !>AM |
---|
31 | |
---|
32 | !! * Substitutions |
---|
33 | # include "top_substitute.h90" |
---|
34 | !!---------------------------------------------------------------------- |
---|
35 | !! NEMO/TOP 3.3 , NEMO Consortium (2010) |
---|
36 | !! $Id: trcsbc.F90 3580 2012-11-16 14:49:18Z cetlod $ |
---|
37 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
---|
38 | !!---------------------------------------------------------------------- |
---|
39 | CONTAINS |
---|
40 | |
---|
41 | SUBROUTINE trc_sbc ( kt ) |
---|
42 | !!---------------------------------------------------------------------- |
---|
43 | !! *** ROUTINE trc_sbc *** |
---|
44 | !! |
---|
45 | !! ** Purpose : Compute the tracer surface boundary condition trend of |
---|
46 | !! (concentration/dilution effect) and add it to the general |
---|
47 | !! trend of tracer equations. |
---|
48 | !! |
---|
49 | !! ** Method : |
---|
50 | !! * concentration/dilution effect: |
---|
51 | !AM: |
---|
52 | !! If jn_tremp(jn) = 1 then |
---|
53 | !! The surface freshwater flux modify the ocean volume |
---|
54 | !! and thus the concentration of a tracer as : |
---|
55 | !! tra = tra + emp * trn / e3t for k=1 |
---|
56 | !! where emp, the surface freshwater budget (evaporation minus |
---|
57 | !! precipitation ) given in kg/m2/s is divided |
---|
58 | !! by 1035 kg/m3 (density of ocean water) to obtain m/s. |
---|
59 | !! |
---|
60 | !! ** Action : - Update the 1st level of tra with the trend associated |
---|
61 | !! with the tracer surface boundary condition |
---|
62 | !! |
---|
63 | !!---------------------------------------------------------------------- |
---|
64 | ! |
---|
65 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
---|
66 | ! |
---|
67 | INTEGER :: ji, jj, jn ! dummy loop indices |
---|
68 | REAL(wp) :: zsrau, zse3t ! temporary scalars |
---|
69 | CHARACTER (len=22) :: charout |
---|
70 | REAL(wp), POINTER, DIMENSION(:,: ) :: zemps |
---|
71 | REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrtrd |
---|
72 | ! |
---|
73 | !AM< |
---|
74 | NAMELIST/namtrc_emp/ jn_tremp |
---|
75 | !>AM |
---|
76 | !!--------------------------------------------------------------------- |
---|
77 | ! |
---|
78 | IF( nn_timing == 1 ) CALL timing_start('trc_sbc') |
---|
79 | ! |
---|
80 | ! Allocate temporary workspace |
---|
81 | CALL wrk_alloc( jpi, jpj, zemps ) |
---|
82 | IF( l_trdtrc ) CALL wrk_alloc( jpi, jpj, jpk, ztrtrd ) |
---|
83 | |
---|
84 | IF( kt == nittrc000 ) THEN |
---|
85 | !AM< |
---|
86 | !! initialize jn_tremp |
---|
87 | DO jn=1,jptra |
---|
88 | jn_tremp(jn)=1 |
---|
89 | ENDDO |
---|
90 | !>AM |
---|
91 | IF(lwp) WRITE(numout,*) |
---|
92 | IF(lwp) WRITE(numout,*) 'trc_sbc : Passive tracers surface boundary condition' |
---|
93 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
---|
94 | !AM< |
---|
95 | REWIND( numnat ) ! read namelist_top |
---|
96 | READ ( numnat, namtrc_emp ) |
---|
97 | IF(lwp) WRITE(numout,*) 'jn_tremp',jn_tremp |
---|
98 | !>AM |
---|
99 | ENDIF |
---|
100 | |
---|
101 | ! Coupling online : river runoff is added to the horizontal divergence (hdivn) in the subroutine sbc_rnf_div |
---|
102 | ! one only consider the concentration/dilution effect due to evaporation minus precipitation + freezing/melting of sea-ice |
---|
103 | |
---|
104 | ! Coupling in offline, hdivn is computed from ocean horizontal velocities only ; the runoff are not included. |
---|
105 | ! emps in dynamical files contains (emps - rnf) |
---|
106 | IF( .NOT. lk_offline .AND. lk_vvl ) THEN ! online coupling + volume variable |
---|
107 | zemps(:,:) = emps(:,:) - emp(:,:) |
---|
108 | ELSE |
---|
109 | zemps(:,:) = emps(:,:) |
---|
110 | ENDIF |
---|
111 | |
---|
112 | ! 0. initialization |
---|
113 | zsrau = 1. / rau0 |
---|
114 | DO jn = 1, jptra |
---|
115 | ! |
---|
116 | IF( l_trdtrc ) ztrtrd(:,:,:) = tra(:,:,:,jn) ! save trends |
---|
117 | !AM< |
---|
118 | IF (jn_tremp(jn) >= 1) THEN |
---|
119 | ! ! if relevant, add the trend to the general tracer trend |
---|
120 | DO jj = 2, jpj |
---|
121 | DO ji = fs_2, fs_jpim1 ! vector opt. |
---|
122 | zse3t = 1. / fse3t(ji,jj,1) |
---|
123 | tra(ji,jj,1,jn) = tra(ji,jj,1,jn) + zemps(ji,jj) * zsrau * trn(ji,jj,1,jn) * zse3t |
---|
124 | END DO |
---|
125 | END DO |
---|
126 | END IF |
---|
127 | !>AM |
---|
128 | IF( l_trdtrc ) THEN |
---|
129 | ztrtrd(:,:,:) = tra(:,:,:,jn) - ztrtrd(:,:,:) |
---|
130 | CALL trd_tra( kt, 'TRC', jn, jptra_trd_nsr, ztrtrd ) |
---|
131 | END IF |
---|
132 | ! ! =========== |
---|
133 | END DO ! tracer loop |
---|
134 | ! ! =========== |
---|
135 | IF( ln_ctl ) THEN |
---|
136 | WRITE(charout, FMT="('sbc ')") ; CALL prt_ctl_trc_info(charout) |
---|
137 | CALL prt_ctl_trc( tab4d=tra, mask=tmask, clinfo=ctrcnm, clinfo2='trd' ) |
---|
138 | ENDIF |
---|
139 | CALL wrk_dealloc( jpi, jpj, zemps ) |
---|
140 | IF( l_trdtrc ) CALL wrk_dealloc( jpi, jpj, jpk, ztrtrd ) |
---|
141 | ! |
---|
142 | IF( nn_timing == 1 ) CALL timing_stop('trc_sbc') |
---|
143 | ! |
---|
144 | END SUBROUTINE trc_sbc |
---|
145 | |
---|
146 | #else |
---|
147 | !!---------------------------------------------------------------------- |
---|
148 | !! Dummy module : NO passive tracer |
---|
149 | !!---------------------------------------------------------------------- |
---|
150 | CONTAINS |
---|
151 | SUBROUTINE trc_sbc (kt) ! Empty routine |
---|
152 | INTEGER, INTENT(in) :: kt |
---|
153 | WRITE(*,*) 'trc_sbc: You should not have seen this print! error?', kt |
---|
154 | END SUBROUTINE trc_sbc |
---|
155 | #endif |
---|
156 | |
---|
157 | !!====================================================================== |
---|
158 | END MODULE trcsbc |
---|