/[MITgcm]/MITgcm/pkg/dic/dic_atmos.F
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Revision 1.1 - (hide annotations) (download)
Mon Nov 5 21:01:37 2007 UTC (16 years, 6 months ago) by stephd
Branch: MAIN
o adding flexibility for determining atmospheric pCO2
  (now defaults to 278d-6, can be read in from data.gchem, can be
   read in from file for time-varing values, and can be linked
   to interactive well mixed atmospheric box)

1 stephd 1.1 #include "DIC_OPTIONS.h"
2     #include "PTRACERS_OPTIONS.h"
3     #include "GCHEM_OPTIONS.h"
4    
5     CBOP
6     C !ROUTINE: DIC_ATMOS
7    
8     C !INTERFACE: ==========================================================
9     SUBROUTINE DIC_ATMOS(myIter,myTime,myThid,istate)
10    
11     C !DESCRIPTION:
12     C Calculate the atmospheric pCO2
13     C gchem_int1:
14     C 0=use default 278.d-6
15     C 1=use constant value - gchem_rl1, read in from data.gchem
16     C 2=read in from file
17     C 3=interact with atmospheric box
18     C !USES: ===============================================================
19     IMPLICIT NONE
20     #include "SIZE.h"
21     #include "DYNVARS.h"
22     #include "EEPARAMS.h"
23     #include "PARAMS.h"
24     #include "GRID.h"
25     #include "FFIELDS.h"
26     #include "DIC_ABIOTIC.h"
27     #ifdef DIC_BIOTIC
28     #include "PTRACERS_SIZE.h"
29     #include "PTRACERS_FIELDS.h"
30     #include "DIC_BIOTIC.h"
31     #endif
32     #include "GCHEM.h"
33     #include "DIC_ATMOS.h"
34    
35     C !INPUT PARAMETERS: ===================================================
36     C myThid :: thread number
37     C myIter :: current timestep
38     C myTime :: current time
39     C istate :: 0=initial call, 1=subsequent calls
40     INTEGER myIter, myThid, istate
41     _RL myTime
42    
43     #ifdef ALLOW_PTRACERS
44     LOGICAL DIFFERENT_MULTIPLE
45     EXTERNAL DIFFERENT_MULTIPLE
46    
47     C !LOCAL VARIABLES: ====================================================
48     INTEGER bi, bj, I,J,k
49     INTEGER it, ntim
50     c
51     _RL total_flux
52     _RL total_ocean_carbon_old
53     _RL total_atmos_carbon_old
54     _RL total_atmos_moles
55     _RL atpco2
56     _RL total_carbon_old, total_carbon, carbon_diff
57     _RL tmp
58     _RL year_diff_ocean, year_diff_atmos, year_total
59     _RL start_diff_ocean, start_diff_atmos, start_total
60     C variables for reading CO2 input files
61     _RL aWght, bWght
62     c
63     CHARACTER*(MAX_LEN_FNAM) fn
64     LOGICAL permCheckPoint
65     CEOP
66    
67     cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
68    
69     c if coupled to atmsopheric model, use the
70     c Co2 value passed from the coupler
71     #ifndef USE_ATMOSCO2
72    
73     c default - set only once
74     if (gchem_int1.eq.0.and.istate.eq.0) then
75     DO bj=myByLo(myThid),myByHi(myThid)
76     DO bi=myBxLo(myThid),myBxHi(myThid)
77    
78     DO j=1-OLy,sNy+OLy
79     DO i=1-OLx,sNx+OLx
80     AtmospCO2(i,j,bi,bj)=278.0 _d -6
81     ENDDO
82     ENDDO
83    
84     ENDDO
85     ENDDO
86     endif
87    
88     c user specified value - set only once
89     if (gchem_int1.eq.1.and.istate.eq.0) then
90     DO bj=myByLo(myThid),myByHi(myThid)
91     DO bi=myBxLo(myThid),myBxHi(myThid)
92    
93     DO j=1-OLy,sNy+OLy
94     DO i=1-OLx,sNx+OLx
95     AtmospCO2(i,j,bi,bj)=gchem_rl1
96     ENDDO
97     ENDDO
98    
99     ENDDO
100     ENDDO
101     endif
102    
103     c read from a file (note:
104     c gchem_int2=number entries to read
105     c gchem_int3=start timestep,
106     c gchem_int4=timestep between file entries)
107     if (gchem_int1.eq.2) then
108     if (istate.eq.0) then
109     OPEN(28,FILE='co2atmos.dat',STATUS='old')
110     do it=1,gchem_int2
111     READ(28,*) co2atmos(it)
112     print*,'co2atmos',co2atmos(it)
113     enddo
114     endif
115     c linearly interpolate between file entries
116     ntim=int((myIter-gchem_int3)/gchem_int4)+1
117     aWght=0.5+float(myIter-gchem_int3)/float(gchem_int4)-
118     & float(ntim-1)
119     if (aWght.gt.1.d0) then
120     ntim=ntim+1
121     aWght=aWght-1.d0
122     endif
123     bWght=1.d0-aWght
124     tmp=co2atmos(ntim)*bWght+co2atmos(ntim+1)*aWght
125     c print*,'weights',ntim, aWght, bWght, tmp
126    
127     DO bj=myByLo(myThid),myByHi(myThid)
128     DO bi=myBxLo(myThid),myBxHi(myThid)
129    
130     DO j=1-OLy,sNy+OLy
131     DO i=1-OLx,sNx+OLx
132    
133     AtmospCO2(i,j,bi,bj)=tmp
134     ENDDO
135     ENDDO
136    
137     print*,'AtmospCO2(20,20)',AtmospCO2(20,20,bi,bj)
138    
139     ENDDO
140     ENDDO
141    
142    
143     endif
144    
145    
146     c interactive atmosphere
147     if (gchem_int1.eq.3) then
148    
149     _BEGIN_MASTER(myThid)
150    
151     total_atmos_moles= 1.5 _d 20
152    
153     if (istate.gt.0) then
154     total_ocean_carbon_old=total_ocean_carbon
155     total_atmos_carbon_old=total_atmos_carbon
156     else
157     total_ocean_carbon_old=0. _d 0
158     total_atmos_carbon_old=0. _d 0
159     endif
160    
161     total_flux= 0. _d 0
162     total_ocean_carbon= 0. _d 0
163    
164     DO bj=myByLo(myThid),myByHi(myThid)
165     DO bi=myBxLo(myThid),myBxHi(myThid)
166     DO i=1,sNx
167     DO j=1,sNy
168     if (istate.gt.0) then
169     total_flux=total_flux+FluxCO2(i,j,bi,bj)*rA(i,j,bi,bj)*
170     & hFacC(i,j,1,bi,bj)*dTtracerLev(1)
171     endif
172     DO k=1,nR
173     total_ocean_carbon= total_ocean_carbon+
174     & ( Ptracer(i,j,k,bi,bj,1)+
175     & R_cp*Ptracer(i,j,k,bi,bj,4) )*rA(i,j,bi,bj)*
176     & drF(k)*hFacC(i,j,k,bi,bj)
177     ENDDO
178     ENDDO
179     ENDDO
180     ENDDO
181     ENDDO
182     _GLOBAL_SUM_R8(total_flux,myThid)
183     _GLOBAL_SUM_R8(total_ocean_carbon,myThid)
184    
185    
186     if (istate.eq.0) then
187     c read state from output file
188     DO i = 1,MAX_LEN_FNAM
189     fn(i:i) = ' '
190     ENDDO
191     WRITE(fn,'(A,I10.10)') 'dic_atmos.',myIter
192     C Going to really do some IO. Make everyone except master thread wait.
193     _BARRIER
194     c read in values from last pickup
195     open(26,file=fn,status='old')
196     read(26,*) total_atmos_carbon, atpco2
197     close(26)
198    
199     else
200     c calculate new atmos pCO2
201     total_atmos_carbon=total_atmos_carbon - total_flux
202     atpco2=total_atmos_carbon/total_atmos_moles
203     c write out if time for a new pickup
204     permCheckPoint = .FALSE.
205     permCheckPoint =
206     & DIFFERENT_MULTIPLE(pChkptFreq,myTime,deltaTClock)
207     if (permCheckPoint) then
208     DO i = 1,MAX_LEN_FNAM
209     fn(i:i) = ' '
210     ENDDO
211     WRITE(fn,'(A,I10.10)') 'dic_atmos.',myIter
212     C Going to really do some IO. Make everyone except master thread wait.
213     _BARRIER
214    
215     open(26,file=fn,status='new')
216     write(26,*) total_atmos_carbon, atpco2
217     close(26)
218    
219     endif
220     endif
221    
222    
223     C-- Everyone else must wait
224     _BARRIER
225    
226     atpco2=total_atmos_carbon/total_atmos_moles
227    
228     c print*,'QQpCO2', total_atmos_carbon, atpco2, total_ocean_carbon,
229     c & total_flux
230    
231     DO bj=myByLo(myThid),myByHi(myThid)
232     DO bi=myBxLo(myThid),myBxHi(myThid)
233    
234     DO j=1-OLy,sNy+OLy
235     DO i=1-OLx,sNx+OLx
236     AtmospCO2(i,j,bi,bj)=atpco2
237     ENDDO
238     ENDDO
239    
240     ENDDO
241     ENDDO
242    
243     print*,'QQ atmos C, total, pCo2', total_atmos_carbon, atpco2
244     total_carbon=total_atmos_carbon + total_ocean_carbon
245     total_carbon_old=total_atmos_carbon_old + total_ocean_carbon_old
246     carbon_diff=total_carbon-total_carbon_old
247     print*,'QQ total C, current, old, diff', total_carbon,
248     & total_carbon_old, carbon_diff
249     carbon_diff=total_ocean_carbon-total_ocean_carbon_old
250     tmp=carbon_diff-total_flux
251     print*,'QQ ocean C, current, old, diff',total_ocean_carbon,
252     & total_ocean_carbon_old, carbon_diff
253     print*,'QQ air-sea flux, addition diff', total_flux, tmp
254    
255     c if end of forcing cycle, find total change in ocean carbon
256     if (istate.eq.0) then
257     total_ocean_carbon_start=total_ocean_carbon
258     total_ocean_carbon_year=total_ocean_carbon
259     total_atmos_carbon_start=total_atmos_carbon
260     total_atmos_carbon_year=total_atmos_carbon
261     else
262     permCheckPoint = .FALSE.
263     permCheckPoint =
264     & DIFFERENT_MULTIPLE(externForcingCycle,myTime,deltaTClock)
265     if (permCheckPoint) then
266     year_diff_ocean=total_ocean_carbon-total_ocean_carbon_year
267     year_diff_atmos=total_atmos_carbon-total_atmos_carbon_year
268     year_total=(total_ocean_carbon+total_atmos_carbon) -
269     & (total_ocean_carbon_year+total_atmos_carbon_year)
270     start_diff_ocean=total_ocean_carbon-total_ocean_carbon_start
271     start_diff_atmos=total_atmos_carbon-total_atmos_carbon_start
272     start_total=(total_ocean_carbon+total_atmos_carbon) -
273     & (total_ocean_carbon_start+total_atmos_carbon_start)
274     print*,'QQ YEAR END'
275     print*,'year diff: ocean, atmos, total', year_diff_ocean,
276     & year_diff_atmos, year_total
277     print*,'start diff: ocean, atmos, total ', start_diff_ocean,
278     & start_diff_atmos, start_total
279     c
280     total_ocean_carbon_year=total_ocean_carbon
281     total_atmos_carbon_year=total_atmos_carbon
282     endif
283     endif
284    
285     _END_MASTER(myThid)
286    
287     C-- Everyone else must wait
288     _BARRIER
289    
290    
291     endif
292    
293     #endif
294     #endif
295    
296     RETURN
297     END

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