1 | ! |
---|
2 | ! $Header$ |
---|
3 | ! |
---|
4 | SUBROUTINE soil(ptimestep, indice, knon, snow, ptsrf, & |
---|
5 | ptsoil, pcapcal, pfluxgrd) |
---|
6 | |
---|
7 | USE dimphy |
---|
8 | USE mod_phys_lmdz_para |
---|
9 | IMPLICIT NONE |
---|
10 | |
---|
11 | !======================================================================= |
---|
12 | ! |
---|
13 | ! Auteur: Frederic Hourdin 30/01/92 |
---|
14 | ! ------- |
---|
15 | ! |
---|
16 | ! Object: Computation of : the soil temperature evolution |
---|
17 | ! ------- the surfacic heat capacity "Capcal" |
---|
18 | ! the surface conduction flux pcapcal |
---|
19 | ! |
---|
20 | ! |
---|
21 | ! Method: Implicit time integration |
---|
22 | ! ------- |
---|
23 | ! Consecutive ground temperatures are related by: |
---|
24 | ! T(k+1) = C(k) + D(k)*T(k) (*) |
---|
25 | ! The coefficients C and D are computed at the t-dt time-step. |
---|
26 | ! Routine structure: |
---|
27 | ! 1) C and D coefficients are computed from the old temperature |
---|
28 | ! 2) new temperatures are computed using (*) |
---|
29 | ! 3) C and D coefficients are computed from the new temperature |
---|
30 | ! profile for the t+dt time-step |
---|
31 | ! 4) the coefficients A and B are computed where the diffusive |
---|
32 | ! fluxes at the t+dt time-step is given by |
---|
33 | ! Fdiff = A + B Ts(t+dt) |
---|
34 | ! or Fdiff = F0 + Capcal (Ts(t+dt)-Ts(t))/dt |
---|
35 | ! with F0 = A + B (Ts(t)) |
---|
36 | ! Capcal = B*dt |
---|
37 | ! |
---|
38 | ! Interface: |
---|
39 | ! ---------- |
---|
40 | ! |
---|
41 | ! Arguments: |
---|
42 | ! ---------- |
---|
43 | ! ptimestep physical timestep (s) |
---|
44 | ! indice sub-surface index |
---|
45 | ! snow(klon) snow |
---|
46 | ! ptsrf(klon) surface temperature at time-step t (K) |
---|
47 | ! ptsoil(klon,nsoilmx) temperature inside the ground (K) |
---|
48 | ! pcapcal(klon) surfacic specific heat (W*m-2*s*K-1) |
---|
49 | ! pfluxgrd(klon) surface diffusive flux from ground (Wm-2) |
---|
50 | ! |
---|
51 | !======================================================================= |
---|
52 | INCLUDE "YOMCST.h" |
---|
53 | INCLUDE "dimsoil.h" |
---|
54 | INCLUDE "indicesol.h" |
---|
55 | INCLUDE "comsoil.h" |
---|
56 | !----------------------------------------------------------------------- |
---|
57 | ! Arguments |
---|
58 | ! --------- |
---|
59 | REAL, INTENT(IN) :: ptimestep |
---|
60 | INTEGER, INTENT(IN) :: indice, knon |
---|
61 | REAL, DIMENSION(klon), INTENT(IN) :: snow |
---|
62 | REAL, DIMENSION(klon), INTENT(IN) :: ptsrf |
---|
63 | |
---|
64 | REAL, DIMENSION(klon,nsoilmx), INTENT(INOUT) :: ptsoil |
---|
65 | REAL, DIMENSION(klon), INTENT(OUT) :: pcapcal |
---|
66 | REAL, DIMENSION(klon), INTENT(OUT) :: pfluxgrd |
---|
67 | |
---|
68 | !----------------------------------------------------------------------- |
---|
69 | ! Local variables |
---|
70 | ! --------------- |
---|
71 | INTEGER :: ig, jk, ierr |
---|
72 | REAL :: min_period,dalph_soil |
---|
73 | REAL, DIMENSION(nsoilmx) :: zdz2 |
---|
74 | REAL :: z1s |
---|
75 | REAL, DIMENSION(klon) :: ztherm_i |
---|
76 | REAL, DIMENSION(klon,nsoilmx,nbsrf) :: C_coef, D_coef |
---|
77 | |
---|
78 | ! Local saved variables |
---|
79 | ! --------------------- |
---|
80 | REAL, SAVE :: lambda |
---|
81 | !$OMP THREADPRIVATE(lambda) |
---|
82 | REAL, DIMENSION(nsoilmx), SAVE :: dz1, dz2 |
---|
83 | !$OMP THREADPRIVATE(dz1,dz2) |
---|
84 | LOGICAL, SAVE :: firstcall=.TRUE. |
---|
85 | !$OMP THREADPRIVATE(firstcall) |
---|
86 | |
---|
87 | !----------------------------------------------------------------------- |
---|
88 | ! Depthts: |
---|
89 | ! -------- |
---|
90 | REAL fz,rk,fz1,rk1,rk2 |
---|
91 | fz(rk)=fz1*(dalph_soil**rk-1.)/(dalph_soil-1.) |
---|
92 | |
---|
93 | |
---|
94 | !----------------------------------------------------------------------- |
---|
95 | ! Calculation of some constants |
---|
96 | ! NB! These constants do not depend on the sub-surfaces |
---|
97 | !----------------------------------------------------------------------- |
---|
98 | |
---|
99 | IF (firstcall) THEN |
---|
100 | !----------------------------------------------------------------------- |
---|
101 | ! ground levels |
---|
102 | ! grnd=z/l where l is the skin depth of the diurnal cycle: |
---|
103 | !----------------------------------------------------------------------- |
---|
104 | |
---|
105 | min_period=1800. ! en secondes |
---|
106 | dalph_soil=2. ! rapport entre les epaisseurs de 2 couches succ. |
---|
107 | !$OMP MASTER |
---|
108 | IF (is_mpi_root) THEN |
---|
109 | OPEN(99,file='soil.def',status='old',form='formatted',iostat=ierr) |
---|
110 | IF (ierr == 0) THEN ! Read file only if it exists |
---|
111 | READ(99,*) min_period |
---|
112 | READ(99,*) dalph_soil |
---|
113 | PRINT*,'Discretization for the soil model' |
---|
114 | PRINT*,'First level e-folding depth',min_period, & |
---|
115 | ' dalph',dalph_soil |
---|
116 | CLOSE(99) |
---|
117 | END IF |
---|
118 | ENDIF |
---|
119 | !$OMP END MASTER |
---|
120 | CALL bcast(min_period) |
---|
121 | CALL bcast(dalph_soil) |
---|
122 | |
---|
123 | ! la premiere couche represente un dixieme de cycle diurne |
---|
124 | fz1=SQRT(min_period/3.14) |
---|
125 | |
---|
126 | DO jk=1,nsoilmx |
---|
127 | rk1=jk |
---|
128 | rk2=jk-1 |
---|
129 | dz2(jk)=fz(rk1)-fz(rk2) |
---|
130 | ENDDO |
---|
131 | DO jk=1,nsoilmx-1 |
---|
132 | rk1=jk+.5 |
---|
133 | rk2=jk-.5 |
---|
134 | dz1(jk)=1./(fz(rk1)-fz(rk2)) |
---|
135 | ENDDO |
---|
136 | lambda=fz(.5)*dz1(1) |
---|
137 | PRINT*,'full layers, intermediate layers (seconds)' |
---|
138 | DO jk=1,nsoilmx |
---|
139 | rk=jk |
---|
140 | rk1=jk+.5 |
---|
141 | rk2=jk-.5 |
---|
142 | PRINT *,'fz=', & |
---|
143 | fz(rk1)*fz(rk2)*3.14,fz(rk)*fz(rk)*3.14 |
---|
144 | ENDDO |
---|
145 | |
---|
146 | firstcall =.FALSE. |
---|
147 | END IF |
---|
148 | |
---|
149 | |
---|
150 | !----------------------------------------------------------------------- |
---|
151 | ! Calcul de l'inertie thermique a partir de la variable rnat. |
---|
152 | ! on initialise a inertie_ice meme au-dessus d'un point de mer au cas |
---|
153 | ! ou le point de mer devienne point de glace au pas suivant |
---|
154 | ! on corrige si on a un point de terre avec ou sans glace |
---|
155 | ! |
---|
156 | !----------------------------------------------------------------------- |
---|
157 | IF (indice == is_sic) THEN |
---|
158 | DO ig = 1, knon |
---|
159 | ztherm_i(ig) = inertie_ice |
---|
160 | IF (snow(ig) > 0.0) ztherm_i(ig) = inertie_sno |
---|
161 | ENDDO |
---|
162 | ELSE IF (indice == is_lic) THEN |
---|
163 | DO ig = 1, knon |
---|
164 | ztherm_i(ig) = inertie_ice |
---|
165 | IF (snow(ig) > 0.0) ztherm_i(ig) = inertie_sno |
---|
166 | ENDDO |
---|
167 | ELSE IF (indice == is_ter) THEN |
---|
168 | DO ig = 1, knon |
---|
169 | ztherm_i(ig) = inertie_sol |
---|
170 | IF (snow(ig) > 0.0) ztherm_i(ig) = inertie_sno |
---|
171 | ENDDO |
---|
172 | ELSE IF (indice == is_oce) THEN |
---|
173 | DO ig = 1, knon |
---|
174 | ztherm_i(ig) = inertie_ice |
---|
175 | ENDDO |
---|
176 | ELSE |
---|
177 | PRINT*, "valeur d indice non prevue", indice |
---|
178 | CALL abort |
---|
179 | ENDIF |
---|
180 | |
---|
181 | |
---|
182 | !----------------------------------------------------------------------- |
---|
183 | ! 1) |
---|
184 | ! Calculation of Cgrf and Dgrd coefficients using soil temperature from |
---|
185 | ! previous time step. |
---|
186 | ! |
---|
187 | ! These variables are recalculated on the local compressed grid instead |
---|
188 | ! of saved in restart file. |
---|
189 | !----------------------------------------------------------------------- |
---|
190 | DO jk=1,nsoilmx |
---|
191 | zdz2(jk)=dz2(jk)/ptimestep |
---|
192 | ENDDO |
---|
193 | |
---|
194 | DO ig=1,knon |
---|
195 | z1s = zdz2(nsoilmx)+dz1(nsoilmx-1) |
---|
196 | C_coef(ig,nsoilmx-1,indice)= & |
---|
197 | zdz2(nsoilmx)*ptsoil(ig,nsoilmx)/z1s |
---|
198 | D_coef(ig,nsoilmx-1,indice)=dz1(nsoilmx-1)/z1s |
---|
199 | ENDDO |
---|
200 | |
---|
201 | DO jk=nsoilmx-1,2,-1 |
---|
202 | DO ig=1,knon |
---|
203 | z1s = 1./(zdz2(jk)+dz1(jk-1)+dz1(jk) & |
---|
204 | *(1.-D_coef(ig,jk,indice))) |
---|
205 | C_coef(ig,jk-1,indice)= & |
---|
206 | (ptsoil(ig,jk)*zdz2(jk)+dz1(jk)*C_coef(ig,jk,indice)) * z1s |
---|
207 | D_coef(ig,jk-1,indice)=dz1(jk-1)*z1s |
---|
208 | ENDDO |
---|
209 | ENDDO |
---|
210 | |
---|
211 | !----------------------------------------------------------------------- |
---|
212 | ! 2) |
---|
213 | ! Computation of the soil temperatures using the Cgrd and Dgrd |
---|
214 | ! coefficient computed above |
---|
215 | ! |
---|
216 | !----------------------------------------------------------------------- |
---|
217 | |
---|
218 | ! Surface temperature |
---|
219 | DO ig=1,knon |
---|
220 | ptsoil(ig,1)=(lambda*C_coef(ig,1,indice)+ptsrf(ig))/ & |
---|
221 | (lambda*(1.-D_coef(ig,1,indice))+1.) |
---|
222 | ENDDO |
---|
223 | |
---|
224 | ! Other temperatures |
---|
225 | DO jk=1,nsoilmx-1 |
---|
226 | DO ig=1,knon |
---|
227 | ptsoil(ig,jk+1)=C_coef(ig,jk,indice)+D_coef(ig,jk,indice) & |
---|
228 | *ptsoil(ig,jk) |
---|
229 | ENDDO |
---|
230 | ENDDO |
---|
231 | |
---|
232 | IF (indice == is_sic) THEN |
---|
233 | DO ig = 1 , knon |
---|
234 | ptsoil(ig,nsoilmx) = RTT - 1.8 |
---|
235 | END DO |
---|
236 | ENDIF |
---|
237 | |
---|
238 | !----------------------------------------------------------------------- |
---|
239 | ! 3) |
---|
240 | ! Calculate the Cgrd and Dgrd coefficient corresponding to actual soil |
---|
241 | ! temperature |
---|
242 | !----------------------------------------------------------------------- |
---|
243 | DO ig=1,knon |
---|
244 | z1s = zdz2(nsoilmx)+dz1(nsoilmx-1) |
---|
245 | C_coef(ig,nsoilmx-1,indice) = zdz2(nsoilmx)*ptsoil(ig,nsoilmx)/z1s |
---|
246 | D_coef(ig,nsoilmx-1,indice) = dz1(nsoilmx-1)/z1s |
---|
247 | ENDDO |
---|
248 | |
---|
249 | DO jk=nsoilmx-1,2,-1 |
---|
250 | DO ig=1,knon |
---|
251 | z1s = 1./(zdz2(jk)+dz1(jk-1)+dz1(jk) & |
---|
252 | *(1.-D_coef(ig,jk,indice))) |
---|
253 | C_coef(ig,jk-1,indice) = & |
---|
254 | (ptsoil(ig,jk)*zdz2(jk)+dz1(jk)*C_coef(ig,jk,indice)) * z1s |
---|
255 | D_coef(ig,jk-1,indice) = dz1(jk-1)*z1s |
---|
256 | ENDDO |
---|
257 | ENDDO |
---|
258 | |
---|
259 | !----------------------------------------------------------------------- |
---|
260 | ! 4) |
---|
261 | ! Computation of the surface diffusive flux from ground and |
---|
262 | ! calorific capacity of the ground |
---|
263 | !----------------------------------------------------------------------- |
---|
264 | DO ig=1,knon |
---|
265 | pfluxgrd(ig) = ztherm_i(ig)*dz1(1)* & |
---|
266 | (C_coef(ig,1,indice)+(D_coef(ig,1,indice)-1.)*ptsoil(ig,1)) |
---|
267 | pcapcal(ig) = ztherm_i(ig)* & |
---|
268 | (dz2(1)+ptimestep*(1.-D_coef(ig,1,indice))*dz1(1)) |
---|
269 | z1s = lambda*(1.-D_coef(ig,1,indice))+1. |
---|
270 | pcapcal(ig) = pcapcal(ig)/z1s |
---|
271 | pfluxgrd(ig) = pfluxgrd(ig) & |
---|
272 | + pcapcal(ig) * (ptsoil(ig,1) * z1s & |
---|
273 | - lambda * C_coef(ig,1,indice) & |
---|
274 | - ptsrf(ig)) & |
---|
275 | /ptimestep |
---|
276 | ENDDO |
---|
277 | |
---|
278 | END SUBROUTINE soil |
---|