1 |
C $Header: /u/gcmpack/MITgcm/pkg/exf/exf_wind.F,v 1.10 2010/04/12 09:00:34 mlosch Exp $ |
2 |
C $Name: $ |
3 |
|
4 |
#include "EXF_OPTIONS.h" |
5 |
|
6 |
SUBROUTINE EXF_WIND( myTime, myIter, myThid ) |
7 |
|
8 |
C ================================================================== |
9 |
C SUBROUTINE exf_wind |
10 |
C ================================================================== |
11 |
C |
12 |
C o Prepare wind speed and stress fields |
13 |
C |
14 |
C ================================================================== |
15 |
C SUBROUTINE exf_wind |
16 |
C ================================================================== |
17 |
|
18 |
IMPLICIT NONE |
19 |
|
20 |
C == global variables == |
21 |
|
22 |
#include "SIZE.h" |
23 |
#include "EEPARAMS.h" |
24 |
#include "PARAMS.h" |
25 |
|
26 |
#include "EXF_PARAM.h" |
27 |
#include "EXF_FIELDS.h" |
28 |
#include "EXF_CONSTANTS.h" |
29 |
|
30 |
#ifdef ALLOW_AUTODIFF_TAMC |
31 |
#include "tamc.h" |
32 |
#include "tamc_keys.h" |
33 |
#endif |
34 |
|
35 |
C == routine arguments == |
36 |
|
37 |
_RL myTime |
38 |
INTEGER myIter |
39 |
INTEGER myThid |
40 |
|
41 |
C == external functions == |
42 |
|
43 |
C == local variables == |
44 |
|
45 |
INTEGER bi,bj |
46 |
INTEGER i,j |
47 |
_RL wsLoc(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
48 |
#ifdef ALLOW_ATM_WIND |
49 |
_RL wsSq |
50 |
#else |
51 |
_RL usSq, recip_sqrtRhoA, ustar |
52 |
_RL tmp1, tmp2, tmp3, tmp4 |
53 |
_RL oneThirdRL |
54 |
PARAMETER ( oneThirdRL = 1.d0 / 3.d0 ) |
55 |
#endif |
56 |
|
57 |
C == end of interface == |
58 |
|
59 |
C-- Use atmospheric state to compute surface fluxes. |
60 |
|
61 |
C Loop over tiles. |
62 |
DO bj = myByLo(myThid),myByHi(myThid) |
63 |
DO bi = myBxLo(myThid),myBxHi(myThid) |
64 |
|
65 |
#ifdef ALLOW_AUTODIFF_TAMC |
66 |
act1 = bi - myBxLo(myThid) |
67 |
max1 = myBxHi(myThid) - myBxLo(myThid) + 1 |
68 |
act2 = bj - myByLo(myThid) |
69 |
max2 = myByHi(myThid) - myByLo(myThid) + 1 |
70 |
act3 = myThid - 1 |
71 |
max3 = nTx*nTy |
72 |
act4 = ikey_dynamics - 1 |
73 |
ikey = (act1 + 1) + act2*max1 |
74 |
& + act3*max1*max2 |
75 |
& + act4*max1*max2*max3 |
76 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
77 |
|
78 |
C-- Initialise |
79 |
DO j = 1,sNy |
80 |
DO i = 1,sNx |
81 |
wsLoc(i,j) = 0. _d 0 |
82 |
cw(i,j,bi,bj) = 0. _d 0 |
83 |
sw(i,j,bi,bj) = 0. _d 0 |
84 |
sh(i,j,bi,bj) = 0. _d 0 |
85 |
wStress(i,j,bi,bj) = 0. _d 0 |
86 |
ENDDO |
87 |
ENDDO |
88 |
|
89 |
#ifdef ALLOW_ATM_WIND |
90 |
|
91 |
C-- Wind speed and direction. |
92 |
DO j = 1,sNy |
93 |
DO i = 1,sNx |
94 |
wsSq = uwind(i,j,bi,bj)*uwind(i,j,bi,bj) |
95 |
& + vwind(i,j,bi,bj)*vwind(i,j,bi,bj) |
96 |
IF ( wsSq .NE. 0. _d 0 ) THEN |
97 |
wsLoc(i,j) = SQRT(wsSq) |
98 |
cw(i,j,bi,bj) = uwind(i,j,bi,bj)/wsLoc(i,j) |
99 |
sw(i,j,bi,bj) = vwind(i,j,bi,bj)/wsLoc(i,j) |
100 |
ELSE |
101 |
wsLoc(i,j) = 0. _d 0 |
102 |
cw(i,j,bi,bj) = 0. _d 0 |
103 |
sw(i,j,bi,bj) = 0. _d 0 |
104 |
ENDIF |
105 |
ENDDO |
106 |
ENDDO |
107 |
IF ( wspeedfile .EQ. ' ' ) THEN |
108 |
C- wind-speed is not loaded from file: save local array into common block |
109 |
DO j = 1,sNy |
110 |
DO i = 1,sNx |
111 |
wspeed(i,j,bi,bj) = wsLoc(i,j) |
112 |
ENDDO |
113 |
ENDDO |
114 |
ENDIF |
115 |
|
116 |
#else /* ifndef ALLOW_ATM_WIND */ |
117 |
|
118 |
C-- Wind stress and direction. |
119 |
DO j = 1,sNy |
120 |
DO i = 1,sNx |
121 |
IF ( stressIsOnCgrid ) THEN |
122 |
usSq = ( ustress(i, j,bi,bj)*ustress(i ,j,bi,bj) |
123 |
& +ustress(i+1,j,bi,bj)*ustress(i+1,j,bi,bj) |
124 |
& +vstress(i,j, bi,bj)*vstress(i,j ,bi,bj) |
125 |
& +vstress(i,j+1,bi,bj)*vstress(i,j+1,bi,bj) |
126 |
& )*0.5 _d 0 |
127 |
ELSE |
128 |
usSq = ustress(i,j,bi,bj)*ustress(i,j,bi,bj) |
129 |
& +vstress(i,j,bi,bj)*vstress(i,j,bi,bj) |
130 |
ENDIF |
131 |
IF ( usSq .NE. 0. _d 0 ) THEN |
132 |
wStress(i,j,bi,bj) = SQRT(usSq) |
133 |
c ustar = SQRT(usSq/atmrho) |
134 |
cw(i,j,bi,bj) = ustress(i,j,bi,bj)/wStress(i,j,bi,bj) |
135 |
sw(i,j,bi,bj) = vstress(i,j,bi,bj)/wStress(i,j,bi,bj) |
136 |
ELSE |
137 |
wStress(i,j,bi,bj) = 0. _d 0 |
138 |
cw(i,j,bi,bj) = 0. _d 0 |
139 |
sw(i,j,bi,bj) = 0. _d 0 |
140 |
ENDIF |
141 |
ENDDO |
142 |
ENDDO |
143 |
|
144 |
IF ( wspeedfile .EQ. ' ' ) THEN |
145 |
C-- wspeed is not loaded ; derive wind-speed by inversion of |
146 |
C wind-stress=fct(wind-speed) relation: |
147 |
C The variables us, sh and rdn have to be computed from |
148 |
C given wind stresses inverting relationship for neutral |
149 |
C drag coeff. cdn. |
150 |
C The inversion is based on linear and quadratic form of |
151 |
C cdn(umps); ustar can be directly computed from stress; |
152 |
recip_sqrtRhoA = 1. _d 0 / SQRT(atmrho) |
153 |
DO j = 1,sNy |
154 |
DO i = 1,sNx |
155 |
ustar = wStress(i,j,bi,bj)*recip_sqrtRhoA |
156 |
IF ( ustar .EQ. 0. _d 0 ) THEN |
157 |
wsLoc(i,j) = 0. _d 0 |
158 |
ELSE IF ( ustar .LT. ustofu11 ) THEN |
159 |
tmp1 = -cquadrag_2/cquadrag_1*exf_half |
160 |
tmp2 = SQRT(tmp1*tmp1 + ustar*ustar/cquadrag_1) |
161 |
wsLoc(i,j) = SQRT(tmp1 + tmp2) |
162 |
ELSE |
163 |
tmp1 = clindrag_2/clindrag_1*oneThirdRL |
164 |
tmp2 = ustar*ustar/clindrag_1*exf_half |
165 |
& - tmp1*tmp1*tmp1 |
166 |
tmp3 = SQRT( ustar*ustar/clindrag_1* |
167 |
& (ustar*ustar/clindrag_1*0.25 _d 0 - tmp1*tmp1*tmp1 ) |
168 |
& ) |
169 |
tmp4 = (tmp2 + tmp3)**oneThirdRL |
170 |
wsLoc(i,j) = tmp4 + tmp1*tmp1 / tmp4 - tmp1 |
171 |
c wsLoc(i,j) = (tmp2 + tmp3)**oneThirdRL + |
172 |
c & tmp1*tmp1 * (tmp2 + tmp3)**(-oneThirdRL) - tmp1 |
173 |
ENDIF |
174 |
ENDDO |
175 |
ENDDO |
176 |
C- save local array wind-speed to common block |
177 |
DO j = 1,sNy |
178 |
DO i = 1,sNx |
179 |
wspeed(i,j,bi,bj) = wsLoc(i,j) |
180 |
ENDDO |
181 |
ENDDO |
182 |
ENDIF |
183 |
|
184 |
C-- infer wind field from wind-speed & wind-stress direction |
185 |
DO j = 1,sNy |
186 |
DO i = 1,sNx |
187 |
uwind(i,j,bi,bj) = wspeed(i,j,bi,bj)*cw(i,j,bi,bj) |
188 |
vwind(i,j,bi,bj) = wspeed(i,j,bi,bj)*sw(i,j,bi,bj) |
189 |
ENDDO |
190 |
ENDDO |
191 |
#endif /* ifndef ALLOW_ATM_WIND */ |
192 |
|
193 |
#ifdef ALLOW_AUTODIFF_TAMC |
194 |
CADJ STORE wspeed(:,:,bi,bj) = comlev1_bibj, key=ikey, byte=isbyte |
195 |
#endif |
196 |
|
197 |
C-- set wind-speed lower limit |
198 |
DO j = 1,sNy |
199 |
DO i = 1,sNx |
200 |
sh(i,j,bi,bj) = MAX(wspeed(i,j,bi,bj),uMin) |
201 |
ENDDO |
202 |
ENDDO |
203 |
|
204 |
C-- end bi,bj loops |
205 |
ENDDO |
206 |
ENDDO |
207 |
|
208 |
RETURN |
209 |
END |