1 | MODULE sbcfwb |
---|
2 | !!====================================================================== |
---|
3 | !! *** MODULE sbcfwb *** |
---|
4 | !! Ocean fluxes : domain averaged freshwater budget |
---|
5 | !!====================================================================== |
---|
6 | !! History : 8.2 ! 01-02 (E. Durand) Original code |
---|
7 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
---|
8 | !! 9.0 ! 06-08 (G. Madec) Surface module |
---|
9 | !! 9.2 ! 09-07 (C. Talandier) emp mean s spread over erp area |
---|
10 | !!---------------------------------------------------------------------- |
---|
11 | |
---|
12 | !!---------------------------------------------------------------------- |
---|
13 | !! sbc_fwb : freshwater budget for global ocean configurations |
---|
14 | !! in free surface and forced mode |
---|
15 | !!---------------------------------------------------------------------- |
---|
16 | USE oce ! ocean dynamics and tracers |
---|
17 | USE dom_oce ! ocean space and time domain |
---|
18 | USE sbc_oce ! surface ocean boundary condition |
---|
19 | USE phycst ! physical constants |
---|
20 | USE sbcrnf ! ocean runoffs |
---|
21 | USE sbcssr ! SS damping terms |
---|
22 | USE in_out_manager ! I/O manager |
---|
23 | USE lib_mpp ! distribued memory computing library |
---|
24 | USE lbclnk ! ocean lateral boundary conditions |
---|
25 | USE lib_fortran |
---|
26 | |
---|
27 | IMPLICIT NONE |
---|
28 | PRIVATE |
---|
29 | |
---|
30 | PUBLIC sbc_fwb ! routine called by step |
---|
31 | |
---|
32 | REAL(wp) :: a_fwb_b ! annual domain averaged freshwater budget |
---|
33 | REAL(wp) :: a_fwb ! for 2 year before (_b) and before year. |
---|
34 | REAL(wp) :: fwfold ! fwfold to be suppressed |
---|
35 | REAL(wp) :: area ! global mean ocean surface (interior domain) |
---|
36 | |
---|
37 | REAL(wp), DIMENSION(jpi,jpj) :: e1e2 ! area of the interior domain (e1t*e2t) |
---|
38 | |
---|
39 | !! * Substitutions |
---|
40 | # include "domzgr_substitute.h90" |
---|
41 | # include "vectopt_loop_substitute.h90" |
---|
42 | !!---------------------------------------------------------------------- |
---|
43 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
---|
44 | !! $Id$ |
---|
45 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
---|
46 | !!---------------------------------------------------------------------- |
---|
47 | CONTAINS |
---|
48 | |
---|
49 | SUBROUTINE sbc_fwb( kt, kn_fwb, kn_fsbc ) |
---|
50 | !!--------------------------------------------------------------------- |
---|
51 | !! *** ROUTINE sbc_fwb *** |
---|
52 | !! |
---|
53 | !! ** Purpose : Control the mean sea surface drift |
---|
54 | !! |
---|
55 | !! ** Method : several ways depending on kn_fwb |
---|
56 | !! =0 no control |
---|
57 | !! =1 global mean of emp set to zero at each nn_fsbc time step |
---|
58 | !! =2 annual global mean corrected from previous year |
---|
59 | !! =3 global mean of emp set to zero at each nn_fsbc time step |
---|
60 | !! & spread out over erp area depending its sign |
---|
61 | !!---------------------------------------------------------------------- |
---|
62 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
---|
63 | INTEGER, INTENT( in ) :: kn_fsbc ! |
---|
64 | INTEGER, INTENT( in ) :: kn_fwb ! ocean time-step index |
---|
65 | !! |
---|
66 | INTEGER :: inum ! temporary logical unit |
---|
67 | INTEGER :: ikty, iyear ! |
---|
68 | REAL(wp) :: z_fwf, z_fwf_nsrf, zsum_fwf, zsum_erp ! temporary scalars |
---|
69 | REAL(wp) :: zsurf_neg, zsurf_pos, zsurf_tospread |
---|
70 | REAL(wp), DIMENSION(jpi,jpj) :: ztmsk_neg, ztmsk_pos, ztmsk_tospread |
---|
71 | REAL(wp), DIMENSION(jpi,jpj) :: z_wgt, zerp_cor |
---|
72 | !!---------------------------------------------------------------------- |
---|
73 | ! |
---|
74 | IF( kt == nit000 ) THEN |
---|
75 | ! |
---|
76 | IF(lwp) THEN |
---|
77 | WRITE(numout,*) |
---|
78 | WRITE(numout,*) 'sbc_fwb : FreshWater Budget correction' |
---|
79 | WRITE(numout,*) '~~~~~~~' |
---|
80 | IF( kn_fwb == 1 ) WRITE(numout,*) ' instantaneously set to zero' |
---|
81 | IF( kn_fwb == 2 ) WRITE(numout,*) ' adjusted from previous year budget' |
---|
82 | IF( kn_fwb == 3 ) WRITE(numout,*) ' fwf set to zero and spread out over erp area' |
---|
83 | ! |
---|
84 | IF( kn_fwb == 3 .AND. nn_sssr /= 2 ) & |
---|
85 | & CALL ctl_stop( 'The option nn_fwb = 3 must be associated to nn_sssr = 2 ' ) |
---|
86 | |
---|
87 | ENDIF |
---|
88 | ! |
---|
89 | e1e2(:,:) = e1t(:,:) * e2t(:,:) |
---|
90 | area = glob_sum( e1e2(:,:) ) ! sum over the global domain |
---|
91 | ! |
---|
92 | ENDIF |
---|
93 | |
---|
94 | |
---|
95 | SELECT CASE ( kn_fwb ) |
---|
96 | ! |
---|
97 | CASE ( 0 ) |
---|
98 | WRITE(ctmp1,*)'sbc_fwb : nn_fwb = ', kn_fwb, ' is not yet associated to an option, choose either 1/2' |
---|
99 | CALL ctl_stop( ctmp1 ) |
---|
100 | ! |
---|
101 | |
---|
102 | ! |
---|
103 | CASE ( 1 ) ! global mean fwf set to zero |
---|
104 | IF( MOD( kt-1, kn_fsbc ) == 0 ) THEN |
---|
105 | z_fwf = glob_sum( e1e2(:,:) * ( emp(:,:) - rnf(:,:) ) ) / area ! sum over the global domain |
---|
106 | emp (:,:) = emp (:,:) - z_fwf |
---|
107 | emps(:,:) = emps(:,:) - z_fwf |
---|
108 | ENDIF |
---|
109 | ! |
---|
110 | CASE ( 2 ) ! fwf budget adjusted from the previous year |
---|
111 | ! initialisation |
---|
112 | IF( kt == nit000 ) THEN |
---|
113 | ! Read the corrective factor on precipitations (fwfold) |
---|
114 | CALL ctl_opn( inum, 'EMPave_old.dat', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, numout, .FALSE. ) |
---|
115 | READ ( inum, "(24X,I8,2ES24.16)" ) iyear, a_fwb_b, a_fwb |
---|
116 | CLOSE( inum ) |
---|
117 | fwfold = a_fwb ! current year freshwater budget correction |
---|
118 | ! ! estimate from the previous year budget |
---|
119 | IF(lwp)WRITE(numout,*) |
---|
120 | IF(lwp)WRITE(numout,*)'sbc_fwb : year = ',iyear , ' freshwater budget correction = ', fwfold |
---|
121 | IF(lwp)WRITE(numout,*)' year = ',iyear-1, ' freshwater budget read = ', a_fwb |
---|
122 | IF(lwp)WRITE(numout,*)' year = ',iyear-2, ' freshwater budget read = ', a_fwb_b |
---|
123 | ENDIF |
---|
124 | ! |
---|
125 | ! Update fwfold if new year start |
---|
126 | ikty = 365 * 86400 / rdttra(1) !!bug use of 365 days leap year or 360d year !!!!!!! |
---|
127 | IF( MOD( kt, ikty ) == 0 ) THEN |
---|
128 | a_fwb_b = a_fwb |
---|
129 | a_fwb = glob_sum( e1e2(:,:) * sshn(:,:) ) ! sum over the global domain |
---|
130 | a_fwb = a_fwb * 1.e+3 / ( area * 86400. * 365. ) ! convert in Kg/m3/s = mm/s |
---|
131 | !!gm ! !!bug 365d year |
---|
132 | fwfold = a_fwb ! current year freshwater budget correction |
---|
133 | ! ! estimate from the previous year budget |
---|
134 | ENDIF |
---|
135 | ! |
---|
136 | ! correct the freshwater fluxes |
---|
137 | IF( MOD( kt-1, kn_fsbc ) == 0 ) THEN |
---|
138 | emp (:,:) = emp (:,:) + fwfold |
---|
139 | emps(:,:) = emps(:,:) + fwfold |
---|
140 | ENDIF |
---|
141 | ! |
---|
142 | ! save fwfold value in a file |
---|
143 | IF( kt == nitend .AND. lwp ) THEN |
---|
144 | CALL ctl_opn( inum, 'EMPave.dat', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, numout, .FALSE., narea ) |
---|
145 | WRITE( inum, "(24X,I8,2ES24.16)" ) nyear, a_fwb_b, a_fwb |
---|
146 | CLOSE( inum ) |
---|
147 | ENDIF |
---|
148 | ! |
---|
149 | CASE ( 3 ) ! global fwf set to zero and spread out over erp area |
---|
150 | ! |
---|
151 | IF( MOD( kt-1, kn_fsbc ) == 0 ) THEN |
---|
152 | ! Select <0 and >0 area of erp |
---|
153 | ztmsk_pos(:,:) = tmask_i(:,:) |
---|
154 | WHERE( erp < 0.e0 ) ztmsk_pos = 0.e0 |
---|
155 | ztmsk_neg(:,:) = tmask_i(:,:) - ztmsk_pos(:,:) |
---|
156 | |
---|
157 | ! Area filled by <0 and >0 erp |
---|
158 | zsurf_neg = glob_sum( e1e2(:,:)*ztmsk_neg(:,:) ) |
---|
159 | zsurf_pos = glob_sum( e1e2(:,:)*ztmsk_pos(:,:) ) |
---|
160 | |
---|
161 | ! fwf global mean |
---|
162 | z_fwf = glob_sum( e1e2(:,:) * ( emp(:,:) - rnf(:,:) ) ) / area |
---|
163 | |
---|
164 | IF( z_fwf < 0.e0 ) THEN |
---|
165 | ! to spread out over >0 erp area to increase evaporation damping process |
---|
166 | zsurf_tospread = zsurf_pos |
---|
167 | ztmsk_tospread(:,:) = ztmsk_pos(:,:) |
---|
168 | ELSE |
---|
169 | ! to spread out over <0 erp area to increase precipitation damping process |
---|
170 | zsurf_tospread = zsurf_neg |
---|
171 | ztmsk_tospread(:,:) = ztmsk_neg(:,:) |
---|
172 | ENDIF |
---|
173 | |
---|
174 | ! fwf global mean over <0 or >0 erp area |
---|
175 | zsum_fwf = glob_sum( e1e2(:,:) * z_fwf ) |
---|
176 | z_fwf_nsrf = zsum_fwf / ( zsurf_tospread + rsmall ) |
---|
177 | ! weight to respect erp field 2D structure |
---|
178 | zsum_erp = glob_sum( ztmsk_tospread(:,:) * erp(:,:) * e1e2(:,:) ) |
---|
179 | z_wgt(:,:) = ztmsk_tospread(:,:) * erp(:,:) / ( zsum_erp + rsmall ) |
---|
180 | |
---|
181 | ! final correction term to apply |
---|
182 | zerp_cor(:,:) = -1. * z_fwf_nsrf * zsurf_tospread * z_wgt(:,:) |
---|
183 | |
---|
184 | CALL lbc_lnk( zerp_cor, 'T', 1. ) |
---|
185 | |
---|
186 | emp (:,:) = emp (:,:) + zerp_cor(:,:) |
---|
187 | emps(:,:) = emps(:,:) + zerp_cor(:,:) |
---|
188 | erp (:,:) = erp (:,:) + zerp_cor(:,:) |
---|
189 | |
---|
190 | IF( nprint == 1 .AND. lwp ) THEN |
---|
191 | IF( z_fwf < 0.e0 ) THEN |
---|
192 | WRITE(numout,*)' z_fwf < 0' |
---|
193 | WRITE(numout,*)' SUM(erp+) = ', SUM( ztmsk_tospread(:,:)*erp(:,:)*e1e2(:,:) )*1.e-3,' m3.s-1' |
---|
194 | ELSE |
---|
195 | WRITE(numout,*)' z_fwf >= 0' |
---|
196 | WRITE(numout,*)' SUM(erp-) = ', SUM( ztmsk_tospread(:,:)*erp(:,:)*e1e2(:,:) )*1.e-3,' m3.s-1' |
---|
197 | ENDIF |
---|
198 | WRITE(numout,*)' SUM(empG) = ', SUM( z_fwf*e1e2(:,:) )*1.e-3,' m3.s-1' |
---|
199 | WRITE(numout,*)' z_fwf = ', z_fwf ,' mm.s-1' |
---|
200 | WRITE(numout,*)' z_fwf_nsrf = ', z_fwf_nsrf ,' mm.s-1' |
---|
201 | WRITE(numout,*)' MIN(zerp_cor) = ', MINVAL(zerp_cor) |
---|
202 | WRITE(numout,*)' MAX(zerp_cor) = ', MAXVAL(zerp_cor) |
---|
203 | ENDIF |
---|
204 | ! |
---|
205 | ENDIF |
---|
206 | ! |
---|
207 | CASE DEFAULT ! you should never be there |
---|
208 | WRITE(ctmp1,*)'sbc_fwb : nn_fwb = ', kn_fwb, ' is not permitted for the FreshWater Budget correction, choose either 1/2' |
---|
209 | CALL ctl_stop( ctmp1 ) |
---|
210 | ! |
---|
211 | END SELECT |
---|
212 | ! |
---|
213 | END SUBROUTINE sbc_fwb |
---|
214 | |
---|
215 | !!====================================================================== |
---|
216 | END MODULE sbcfwb |
---|