1 | MODULE limthd_sal |
---|
2 | !!====================================================================== |
---|
3 | !! *** MODULE limthd_sal *** |
---|
4 | !! LIM-3 sea-ice : computation of salinity variations in the ice |
---|
5 | !!====================================================================== |
---|
6 | !! History : - ! 2003-05 (M. Vancoppenolle) UCL-ASTR first coding for LIM3-1D |
---|
7 | !! 3.0 ! 2005-12 (M. Vancoppenolle) adapted to the 3-D version |
---|
8 | !! 4.0 ! 2011-02 (G. Madec) dynamical allocation |
---|
9 | !!--------------------------------------------------------------------- |
---|
10 | #if defined key_lim3 |
---|
11 | !!---------------------------------------------------------------------- |
---|
12 | !! 'key_lim3' LIM-3 sea-ice model |
---|
13 | !!---------------------------------------------------------------------- |
---|
14 | !! lim_thd_sal : salinity variations in the ice |
---|
15 | !!---------------------------------------------------------------------- |
---|
16 | USE par_oce ! ocean parameters |
---|
17 | USE phycst ! physical constants (ocean directory) |
---|
18 | USE sbc_oce ! Surface boundary condition: ocean fields |
---|
19 | USE ice ! LIM variables |
---|
20 | USE par_ice ! LIM parameters |
---|
21 | USE thd_ice ! LIM thermodynamics |
---|
22 | USE limvar ! LIM variables |
---|
23 | USE in_out_manager ! I/O manager |
---|
24 | USE lib_mpp ! MPP library |
---|
25 | USE wrk_nemo ! work arrays |
---|
26 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
---|
27 | |
---|
28 | IMPLICIT NONE |
---|
29 | PRIVATE |
---|
30 | |
---|
31 | PUBLIC lim_thd_sal ! called by limthd module |
---|
32 | PUBLIC lim_thd_sal_init ! called by iceini module |
---|
33 | |
---|
34 | !!---------------------------------------------------------------------- |
---|
35 | !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011) |
---|
36 | !! $Id$ |
---|
37 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
---|
38 | !!---------------------------------------------------------------------- |
---|
39 | CONTAINS |
---|
40 | |
---|
41 | SUBROUTINE lim_thd_sal( kideb, kiut ) |
---|
42 | !!------------------------------------------------------------------- |
---|
43 | !! *** ROUTINE lim_thd_sal *** |
---|
44 | !! |
---|
45 | !! ** Purpose : computes new salinities in the ice |
---|
46 | !! |
---|
47 | !! ** Method : 3 possibilities |
---|
48 | !! -> num_sal = 1 -> Sice = cst [ice salinity constant in both time & space] |
---|
49 | !! -> num_sal = 2 -> Sice = S(z,t) [Vancoppenolle et al. 2005] |
---|
50 | !! -> num_sal = 3 -> Sice = S(z) [multiyear ice] |
---|
51 | !!--------------------------------------------------------------------- |
---|
52 | INTEGER, INTENT(in) :: kideb, kiut ! thickness category index |
---|
53 | ! |
---|
54 | INTEGER :: ji, jk ! dummy loop indices |
---|
55 | REAL(wp) :: iflush, igravdr, ztmelts ! local scalars |
---|
56 | REAL(wp) :: zaaa, zbbb, zccc, zdiscrim ! local scalars |
---|
57 | !!--------------------------------------------------------------------- |
---|
58 | |
---|
59 | !------------------------------------------------------------------------------| |
---|
60 | ! 1) Constant salinity, constant in time | |
---|
61 | !------------------------------------------------------------------------------| |
---|
62 | !!gm comment: if num_sal = 1 s_i_new, s_i_b and sm_i_b can be set to bulk_sal one for all in the initialisation phase !! |
---|
63 | !!gm ===>>> simplification of almost all test on num_sal value |
---|
64 | IF( num_sal == 1 ) THEN |
---|
65 | s_i_b (kideb:kiut,1:nlay_i) = bulk_sal |
---|
66 | sm_i_b (kideb:kiut) = bulk_sal |
---|
67 | s_i_new(kideb:kiut) = bulk_sal |
---|
68 | ENDIF |
---|
69 | |
---|
70 | !------------------------------------------------------------------------------| |
---|
71 | ! Module 2 : Constant salinity varying in time | |
---|
72 | !------------------------------------------------------------------------------| |
---|
73 | |
---|
74 | IF( num_sal == 2 ) THEN |
---|
75 | |
---|
76 | DO ji = kideb, kiut |
---|
77 | ! |
---|
78 | ! Switches |
---|
79 | !---------- |
---|
80 | iflush = MAX( 0._wp , SIGN( 1._wp , t_su_b(ji) - rtt ) ) ! =1 if summer |
---|
81 | igravdr = MAX( 0._wp , SIGN( 1._wp , t_bo_b(ji) - t_su_b(ji) ) ) ! =1 if t_su < t_bo |
---|
82 | |
---|
83 | !--------------------- |
---|
84 | ! Salinity tendencies |
---|
85 | !--------------------- |
---|
86 | ! |
---|
87 | dsm_i_gd_1d(ji) = - igravdr * MAX( sm_i_b(ji) - sal_G , 0._wp ) / time_G * rdt_ice ! drainage by gravity |
---|
88 | dsm_i_fl_1d(ji) = - iflush * MAX( sm_i_b(ji) - sal_F , 0._wp ) / time_F * rdt_ice ! drainage by flushing |
---|
89 | ! |
---|
90 | !----------------- |
---|
91 | ! Update salinity |
---|
92 | !----------------- |
---|
93 | ! only drainage terms ( gravity drainage and flushing ) |
---|
94 | ! snow ice / bottom sources are added in lim_thd_ent to conserve energy |
---|
95 | sm_i_b(ji) = sm_i_b(ji) + dsm_i_fl_1d(ji) + dsm_i_gd_1d(ji) |
---|
96 | |
---|
97 | !---------------------------- |
---|
98 | ! Salt flux - brine drainage |
---|
99 | !---------------------------- |
---|
100 | sfx_bri_1d(ji) = sfx_bri_1d(ji) - rhoic * a_i_b(ji) * ht_i_b(ji) * ( dsm_i_fl_1d(ji) + dsm_i_gd_1d(ji) ) * r1_rdtice |
---|
101 | |
---|
102 | END DO |
---|
103 | |
---|
104 | ! Salinity profile |
---|
105 | CALL lim_var_salprof1d( kideb, kiut ) |
---|
106 | |
---|
107 | |
---|
108 | ! Only necessary for conservation check since salinity is modified |
---|
109 | !-------------------- |
---|
110 | ! Temperature update |
---|
111 | !-------------------- |
---|
112 | DO jk = 1, nlay_i |
---|
113 | DO ji = kideb, kiut |
---|
114 | ztmelts = -tmut*s_i_b(ji,jk) + rtt |
---|
115 | !Conversion q(S,T) -> T (second order equation) |
---|
116 | zaaa = cpic |
---|
117 | zbbb = ( rcp - cpic ) * ( ztmelts - rtt ) + q_i_b(ji,jk) / rhoic - lfus |
---|
118 | zccc = lfus * ( ztmelts - rtt ) |
---|
119 | zdiscrim = SQRT( MAX( zbbb*zbbb - 4.0*zaaa*zccc, 0._wp ) ) |
---|
120 | t_i_b(ji,jk) = rtt - ( zbbb + zdiscrim ) / ( 2.0 *zaaa ) |
---|
121 | END DO |
---|
122 | END DO |
---|
123 | ! |
---|
124 | ENDIF |
---|
125 | |
---|
126 | !------------------------------------------------------------------------------| |
---|
127 | ! Module 3 : Profile of salinity, constant in time | |
---|
128 | !------------------------------------------------------------------------------| |
---|
129 | |
---|
130 | IF( num_sal == 3 ) CALL lim_var_salprof1d( kideb, kiut ) |
---|
131 | |
---|
132 | ! |
---|
133 | END SUBROUTINE lim_thd_sal |
---|
134 | |
---|
135 | |
---|
136 | SUBROUTINE lim_thd_sal_init |
---|
137 | !!------------------------------------------------------------------- |
---|
138 | !! *** ROUTINE lim_thd_sal_init *** |
---|
139 | !! |
---|
140 | !! ** Purpose : initialization of ice salinity parameters |
---|
141 | !! |
---|
142 | !! ** Method : Read the namicesal namelist and check the parameter |
---|
143 | !! values called at the first timestep (nit000) |
---|
144 | !! |
---|
145 | !! ** input : Namelist namicesal |
---|
146 | !!------------------------------------------------------------------- |
---|
147 | NAMELIST/namicesal/ num_sal, bulk_sal, sal_G, time_G, sal_F, time_F, & |
---|
148 | & s_i_max, s_i_min, s_i_0, s_i_1 |
---|
149 | !!------------------------------------------------------------------- |
---|
150 | ! |
---|
151 | REWIND( numnam_ice ) ! Read Namelist namicesal |
---|
152 | READ ( numnam_ice , namicesal ) |
---|
153 | ! |
---|
154 | IF(lwp) THEN ! control print |
---|
155 | WRITE(numout,*) |
---|
156 | WRITE(numout,*) 'lim_thd_sal_init : Ice parameters for salinity ' |
---|
157 | WRITE(numout,*) '~~~~~~~~~~~~~~~~' |
---|
158 | WRITE(numout,*) ' switch for salinity num_sal : ', num_sal |
---|
159 | WRITE(numout,*) ' bulk salinity value if num_sal = 1 : ', bulk_sal |
---|
160 | WRITE(numout,*) ' restoring salinity for GD : ', sal_G |
---|
161 | WRITE(numout,*) ' restoring time for GD : ', time_G |
---|
162 | WRITE(numout,*) ' restoring salinity for flushing : ', sal_F |
---|
163 | WRITE(numout,*) ' restoring time for flushing : ', time_F |
---|
164 | WRITE(numout,*) ' Maximum tolerated ice salinity : ', s_i_max |
---|
165 | WRITE(numout,*) ' Minimum tolerated ice salinity : ', s_i_min |
---|
166 | WRITE(numout,*) ' 1st salinity for salinity profile : ', s_i_0 |
---|
167 | WRITE(numout,*) ' 2nd salinity for salinity profile : ', s_i_1 |
---|
168 | ENDIF |
---|
169 | ! |
---|
170 | END SUBROUTINE lim_thd_sal_init |
---|
171 | |
---|
172 | #else |
---|
173 | !!---------------------------------------------------------------------- |
---|
174 | !! Default option Dummy Module No LIM-3 sea-ice model |
---|
175 | !!---------------------------------------------------------------------- |
---|
176 | #endif |
---|
177 | !!====================================================================== |
---|
178 | END MODULE limthd_sal |
---|