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carbon_cycle_mod.F90 @ 5425

Last change on this file since 5425 was 1907, checked in by lguez, 11 years ago

Added a copyright property to every file of the distribution, except
for the fcm files (which have their own copyright). Use svn propget on
a file to see the copyright. For instance:

$ svn propget copyright libf/phylmd/physiq.F90
Name of program: LMDZ
Creation date: 1984
Version: LMDZ5
License: CeCILL version 2
Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539
See the license file in the root directory

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Property copyright set to
Name of program: LMDZ
Creation date: 1984
Version: LMDZ5
License: CeCILL version 2
Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539
See the license file in the root directory

File size: 18.6 KB

Line
1	MODULE carbon_cycle_mod
2	! Controle module for the carbon CO2 tracers :
3	! - Identification
4	! - Get concentrations comming from coupled model or read from file to tracers
5	! - Calculate new RCO2 for radiation scheme
6	! - Calculate new carbon flux for sending to coupled models (PISCES and ORCHIDEE)
7	!
8	! Author : Josefine GHATTAS, Patricia CADULE
9
10	IMPLICIT NONE
11	SAVE
12	PRIVATE
13	PUBLIC :: carbon_cycle_init, carbon_cycle
14
15	! Variables read from parmeter file physiq.def
16	LOGICAL, PUBLIC :: carbon_cycle_tr ! 3D transport of CO2 in the atmosphere, parameter read in conf_phys
17	!$OMP THREADPRIVATE(carbon_cycle_tr)
18	LOGICAL, PUBLIC :: carbon_cycle_cpl ! Coupling of CO2 fluxes between LMDZ/ORCHIDEE and LMDZ/OCEAN(PISCES)
19	!$OMP THREADPRIVATE(carbon_cycle_cpl)
20
21	LOGICAL :: carbon_cycle_emis_comp_omp=.FALSE.
22	LOGICAL :: carbon_cycle_emis_comp=.FALSE. ! Calculation of emission compatible
23	!$OMP THREADPRIVATE(carbon_cycle_emis_comp)
24
25	LOGICAL :: RCO2_inter_omp
26	LOGICAL :: RCO2_inter ! RCO2 interactive : if true calculate new value RCO2 for the radiation scheme
27	!$OMP THREADPRIVATE(RCO2_inter)
28
29	! Scalare values when no transport, from physiq.def
30	REAL :: fos_fuel_s_omp
31	REAL :: fos_fuel_s ! carbon_cycle_fos_fuel dans physiq.def
32	!$OMP THREADPRIVATE(fos_fuel_s)
33	REAL :: emis_land_s ! not yet implemented
34	!$OMP THREADPRIVATE(emis_land_s)
35
36	REAL :: airetot ! Total area of the earth surface
37	!$OMP THREADPRIVATE(airetot)
38
39	INTEGER :: ntr_co2 ! Number of tracers concerning the carbon cycle
40	!$OMP THREADPRIVATE(ntr_co2)
41
42	! fco2_ocn_day : flux CO2 from ocean for 1 day (cumulated) [gC/m2/d]. Allocation and initalization done in cpl_mod
43	REAL, DIMENSION(:), ALLOCATABLE, PUBLIC :: fco2_ocn_day
44	!$OMP THREADPRIVATE(fco2_ocn_day)
45
46	REAL, DIMENSION(:), ALLOCATABLE :: fco2_land_day ! flux CO2 from land for 1 day (cumulated) [gC/m2/d]
47	!$OMP THREADPRIVATE(fco2_land_day)
48	REAL, DIMENSION(:), ALLOCATABLE :: fco2_lu_day ! Emission from land use change for 1 day (cumulated) [gC/m2/d]
49	!$OMP THREADPRIVATE(fco2_lu_day)
50
51	REAL, DIMENSION(:,:), ALLOCATABLE :: dtr_add ! Tracer concentration to be injected
52	!$OMP THREADPRIVATE(dtr_add)
53
54	! Following 2 fields will be allocated and initialized in surf_land_orchidee
55	REAL, DIMENSION(:), ALLOCATABLE, PUBLIC :: fco2_land_inst ! flux CO2 from land at one time step
56	!$OMP THREADPRIVATE(fco2_land_inst)
57	REAL, DIMENSION(:), ALLOCATABLE, PUBLIC :: fco2_lu_inst ! Emission from land use change at one time step
58	!$OMP THREADPRIVATE(fco2_lu_inst)
59
60	! Calculated co2 field to be send to the ocean via the coupler and to ORCHIDEE
61	REAL, DIMENSION(:), ALLOCATABLE, PUBLIC :: co2_send ! Field allocated in phyetat0
62	!$OMP THREADPRIVATE(co2_send)
63
64
65	TYPE, PUBLIC :: co2_trac_type
66	CHARACTER(len = 8) :: name ! Tracer name in tracer.def
67	INTEGER :: id ! Index in total tracer list, tr_seri
68	CHARACTER(len=30) :: file ! File name
69	LOGICAL :: cpl ! True if this tracers is coupled from ORCHIDEE or PISCES.
70	! False if read from file.
71	INTEGER :: updatefreq ! Frequence to inject in second
72	INTEGER :: readstep ! Actual time step to read in file
73	LOGICAL :: updatenow ! True if this tracer should be updated this time step
74	END TYPE co2_trac_type
75	INTEGER,PARAMETER :: maxco2trac=5 ! Maximum number of different CO2 fluxes
76	TYPE(co2_trac_type), DIMENSION(maxco2trac) :: co2trac
77
78	CONTAINS
79
80	SUBROUTINE carbon_cycle_init(tr_seri, pdtphys, aerosol, radio)
81	! This subroutine is called from traclmdz_init, only at first timestep.
82	! - Read controle parameters from .def input file
83	! - Search for carbon tracers and set default values
84	! - Allocate variables
85	! - Test for compatibility
86
87	USE dimphy
88	USE comgeomphy
89	USE mod_phys_lmdz_transfert_para
90	USE infotrac
91	USE IOIPSL
92	USE surface_data, ONLY : ok_veget, type_ocean
93	USE phys_cal_mod, ONLY : mth_len
94
95	IMPLICIT NONE
96	INCLUDE "clesphys.h"
97	INCLUDE "iniprint.h"
98
99	! Input argument
100	REAL,DIMENSION(klon,klev,nbtr),INTENT(IN) :: tr_seri ! Concentration Traceur [U/KgA]
101	REAL,INTENT(IN) :: pdtphys ! length of time step in physiq (sec)
102
103	! InOutput arguments
104	LOGICAL,DIMENSION(nbtr), INTENT(INOUT) :: aerosol
105	LOGICAL,DIMENSION(nbtr), INTENT(INOUT) :: radio
106
107	! Local variables
108	INTEGER :: ierr, it, iiq, itc
109	INTEGER :: teststop
110
111
112
113	! 1) Read controle parameters from .def input file
114	! ------------------------------------------------
115	! Read fosil fuel value if no transport
116	IF (.NOT. carbon_cycle_tr) THEN
117	!$OMP MASTER
118	fos_fuel_s_omp = 0.
119	CALL getin ('carbon_cycle_fos_fuel',fos_fuel_s_omp)
120	!$OMP END MASTER
121	!$OMP BARRIER
122	fos_fuel_s=fos_fuel_s_omp
123	WRITE(lunout,*) 'carbon_cycle_fos_fuel = ', fos_fuel_s
124	END IF
125
126
127	! Read parmeter for calculation compatible emission
128	IF (.NOT. carbon_cycle_tr) THEN
129	!$OMP MASTER
130	carbon_cycle_emis_comp_omp=.FALSE.
131	CALL getin('carbon_cycle_emis_comp',carbon_cycle_emis_comp_omp)
132	!$OMP END MASTER
133	!$OMP BARRIER
134	carbon_cycle_emis_comp=carbon_cycle_emis_comp_omp
135	WRITE(lunout,*) 'carbon_cycle_emis_comp = ',carbon_cycle_emis_comp
136	IF (carbon_cycle_emis_comp) THEN
137	CALL abort_gcm('carbon_cycle_init', 'carbon_cycle_emis_comp option not yet implemented!!',1)
138	END IF
139	END IF
140
141	! Read parameter for interactive calculation of the CO2 value for the radiation scheme
142	!$OMP MASTER
143	RCO2_inter_omp=.FALSE.
144	CALL getin('RCO2_inter',RCO2_inter_omp)
145	!$OMP END MASTER
146	!$OMP BARRIER
147	RCO2_inter=RCO2_inter_omp
148	WRITE(lunout,*) 'RCO2_inter = ', RCO2_inter
149	IF (RCO2_inter) THEN
150	WRITE(lunout,*) 'RCO2 will be recalculated once a day'
151	WRITE(lunout,*) 'RCO2 initial = ', RCO2
152	END IF
153
154
155	! 2) Search for carbon tracers and set default values
156	! ---------------------------------------------------
157	itc=0
158	DO it=1,nbtr
159	iiq=niadv(it+2)
160
161	SELECT CASE(tname(iiq))
162	CASE("fCO2_ocn")
163	itc = itc + 1
164	co2trac(itc)%name='fCO2_ocn'
165	co2trac(itc)%id=it
166	co2trac(itc)%file='fl_co2_ocean.nc'
167	IF (carbon_cycle_cpl .AND. type_ocean=='couple') THEN
168	co2trac(itc)%cpl=.TRUE.
169	co2trac(itc)%updatefreq = 86400 ! Once a day as the coupling with OASIS/PISCES
170	ELSE
171	co2trac(itc)%cpl=.FALSE.
172	co2trac(itc)%updatefreq = 86400*mth_len ! Once a month
173	END IF
174	CASE("fCO2_land")
175	itc = itc + 1
176	co2trac(itc)%name='fCO2_land'
177	co2trac(itc)%id=it
178	co2trac(itc)%file='fl_co2_land.nc'
179	IF (carbon_cycle_cpl .AND. ok_veget) THEN
180	co2trac(itc)%cpl=.TRUE.
181	co2trac(itc)%updatefreq = INT(pdtphys) ! Each timestep as the coupling with ORCHIDEE
182	ELSE
183	co2trac(itc)%cpl=.FALSE.
184	! co2trac(itc)%updatefreq = 10800 ! 10800sec = 3H
185	co2trac(itc)%updatefreq = 86400*mth_len ! Once a month
186	END IF
187	CASE("fCO2_land_use")
188	itc = itc + 1
189	co2trac(itc)%name='fCO2_land_use'
190	co2trac(itc)%id=it
191	co2trac(itc)%file='fl_co2_land_use.nc'
192	IF (carbon_cycle_cpl .AND. ok_veget) THEN
193	co2trac(it)%cpl=.TRUE.
194	co2trac(itc)%updatefreq = INT(pdtphys) ! Each timestep as the coupling with ORCHIDEE
195	ELSE
196	co2trac(itc)%cpl=.FALSE.
197	co2trac(itc)%updatefreq = 10800 ! 10800sec = 3H
198	END IF
199	CASE("fCO2_fos_fuel")
200	itc = itc + 1
201	co2trac(itc)%name='fCO2_fos_fuel'
202	co2trac(itc)%id=it
203	co2trac(itc)%file='fossil_fuel.nc'
204	co2trac(itc)%cpl=.FALSE. ! This tracer always read from file
205	! co2trac(itc)%updatefreq = 86400 ! 86400sec = 24H Cadule case
206	co2trac(itc)%updatefreq = 86400*mth_len ! Once a month
207	CASE("fCO2_bbg")
208	itc = itc + 1
209	co2trac(itc)%name='fCO2_bbg'
210	co2trac(itc)%id=it
211	co2trac(itc)%file='fl_co2_bbg.nc'
212	co2trac(itc)%cpl=.FALSE. ! This tracer always read from file
213	co2trac(itc)%updatefreq = 86400*mth_len ! Once a month
214	CASE("fCO2")
215	! fCO2 : One tracer transporting the total CO2 flux
216	itc = itc + 1
217	co2trac(itc)%name='fCO2'
218	co2trac(itc)%id=it
219	co2trac(itc)%file='fl_co2.nc'
220	IF (carbon_cycle_cpl) THEN
221	co2trac(itc)%cpl=.TRUE.
222	ELSE
223	co2trac(itc)%cpl=.FALSE.
224	END IF
225	co2trac(itc)%updatefreq = 86400
226	! DOES THIS WORK ???? Problematic due to implementation of the coupled fluxes...
227	CALL abort_gcm('carbon_cycle_init','transport of total CO2 has to be implemented and tested',1)
228	END SELECT
229	END DO
230
231	! Total number of carbon CO2 tracers
232	ntr_co2 = itc
233
234	! Definition of control varaiables for the tracers
235	DO it=1,ntr_co2
236	aerosol(co2trac(it)%id) = .FALSE.
237	radio(co2trac(it)%id) = .FALSE.
238	END DO
239
240	! Vector indicating which timestep to read for each tracer
241	! Always start read in the beginning of the file
242	co2trac(:)%readstep = 0
243
244
245	! 3) Allocate variables
246	! ---------------------
247	! Allocate vector for storing fluxes to inject
248	ALLOCATE(dtr_add(klon,maxco2trac), stat=ierr)
249	IF (ierr /= 0) CALL abort_gcm('carbon_cycle_init', 'pb in allocation 11',1)
250
251	! Allocate variables for cumulating fluxes from ORCHIDEE
252	IF (RCO2_inter) THEN
253	IF (.NOT. carbon_cycle_tr .AND. carbon_cycle_cpl) THEN
254	ALLOCATE(fco2_land_day(klon), stat=ierr)
255	IF (ierr /= 0) CALL abort_gcm('carbon_cycle_init', 'pb in allocation 2',1)
256	fco2_land_day(1:klon) = 0.
257
258	ALLOCATE(fco2_lu_day(klon), stat=ierr)
259	IF (ierr /= 0) CALL abort_gcm('carbon_cycle_init', 'pb in allocation 3',1)
260	fco2_lu_day(1:klon) = 0.
261	END IF
262	END IF
263
264
265	! 4) Test for compatibility
266	! -------------------------
267	! IF (carbon_cycle_cpl .AND. type_ocean/='couple') THEN
268	! WRITE(lunout,*) 'Coupling with ocean model is needed for carbon_cycle_cpl'
269	! CALL abort_gcm('carbon_cycle_init', 'coupled ocean is needed for carbon_cycle_cpl',1)
270	! END IF
271	!
272	! IF (carbon_cycle_cpl .AND..NOT. ok_veget) THEN
273	! WRITE(lunout,*) 'Coupling with surface land model ORCHDIEE is needed for carbon_cycle_cpl'
274	! CALL abort_gcm('carbon_cycle_init', 'ok_veget is needed for carbon_cycle_cpl',1)
275	! END IF
276
277	! Compiler test : following should never happen
278	teststop=0
279	DO it=1,teststop
280	CALL abort_gcm('carbon_cycle_init', 'Entering loop from 1 to 0',1)
281	END DO
282
283	IF (ntr_co2==0) THEN
284	! No carbon tracers found in tracer.def. It is not possible to do carbon cycle
285	WRITE(lunout,*) 'No carbon tracers found in tracer.def. Not ok with carbon_cycle_tr and/or carbon_cycle_cp'
286	CALL abort_gcm('carbon_cycle_init', 'No carbon tracers found in tracer.def',1)
287	END IF
288
289	! 5) Calculate total area of the earth surface
290	! --------------------------------------------
291	CALL reduce_sum(SUM(airephy),airetot)
292	CALL bcast(airetot)
293
294	END SUBROUTINE carbon_cycle_init
295
296
297	SUBROUTINE carbon_cycle(nstep, pdtphys, pctsrf, tr_seri, source)
298	! Subroutine for injection of co2 in the tracers
299	!
300	! - Find out if it is time to update
301	! - Get tracer from coupled model or from file
302	! - Calculate new RCO2 value for the radiation scheme
303	! - Calculate CO2 flux to send to ocean and land models (PISCES and ORCHIDEE)
304
305	USE infotrac
306	USE dimphy
307	USE mod_phys_lmdz_transfert_para
308	USE phys_cal_mod, ONLY : mth_cur, mth_len
309	USE phys_cal_mod, ONLY : day_cur
310	USE comgeomphy
311	USE indice_sol_mod
312
313	IMPLICIT NONE
314
315	INCLUDE "clesphys.h"
316	INCLUDE "iniprint.h"
317	INCLUDE "YOMCST.h"
318
319	! In/Output arguments
320	INTEGER,INTENT(IN) :: nstep ! time step in physiq
321	REAL,INTENT(IN) :: pdtphys ! length of time step in physiq (sec)
322	REAL,DIMENSION(klon,nbsrf),INTENT(IN) :: pctsrf ! Surface fraction
323	REAL, DIMENSION(klon,klev,nbtr), INTENT(INOUT) :: tr_seri ! All tracers
324	REAL, DIMENSION(klon,nbtr), INTENT(INOUT) :: source ! Source for all tracers
325
326	! Local variables
327	INTEGER :: it
328	LOGICAL :: newmonth ! indicates if a new month just started
329	LOGICAL :: newday ! indicates if a new day just started
330	LOGICAL :: endday ! indicated if last time step in a day
331
332	REAL, PARAMETER :: fact=1.E-15/2.12 ! transformation factor from gC/m2/day => ppm/m2/day
333	REAL, DIMENSION(klon) :: fco2_tmp
334	REAL :: sumtmp
335	REAL :: delta_co2_ppm
336
337
338	! 1) Calculate logicals indicating if it is a new month, new day or the last time step in a day (end day)
339	! -------------------------------------------------------------------------------------------------------
340
341	newday = .FALSE.; endday = .FALSE.; newmonth = .FALSE.
342
343	IF (MOD(nstep,INT(86400./pdtphys))==1) newday=.TRUE.
344	IF (MOD(nstep,INT(86400./pdtphys))==0) endday=.TRUE.
345	IF (newday .AND. day_cur==1) newmonth=.TRUE.
346
347	! 2) For each carbon tracer find out if it is time to inject (update)
348	! --------------------------------------------------------------------
349	DO it = 1, ntr_co2
350	IF ( MOD(nstep,INT(co2trac(it)%updatefreq/pdtphys)) == 1 ) THEN
351	co2trac(it)%updatenow = .TRUE.
352	ELSE
353	co2trac(it)%updatenow = .FALSE.
354	END IF
355	END DO
356
357	! 3) Get tracer update
358	! --------------------------------------
359	DO it = 1, ntr_co2
360	IF ( co2trac(it)%updatenow ) THEN
361	IF ( co2trac(it)%cpl ) THEN
362	! Get tracer from coupled model
363	SELECT CASE(co2trac(it)%name)
364	CASE('fCO2_land') ! from ORCHIDEE
365	dtr_add(:,it) = fco2_land_inst(:)pctsrf(:,is_ter)fact ! [ppm/m2/day]
366	CASE('fCO2_land_use') ! from ORCHIDEE
367	dtr_add(:,it) = fco2_lu_inst(:) pctsrf(:,is_ter)fact ! [ppm/m2/day]
368	CASE('fCO2_ocn') ! from PISCES
369	dtr_add(:,it) = fco2_ocn_day(:) pctsrf(:,is_oce)fact ! [ppm/m2/day]
370	CASE DEFAULT
371	WRITE(lunout,*) 'Error with tracer ',co2trac(it)%name
372	CALL abort_gcm('carbon_cycle', 'No coupling implemented for this tracer',1)
373	END SELECT
374	ELSE
375	! Read tracer from file
376	co2trac(it)%readstep = co2trac(it)%readstep + 1 ! increment time step in file
377	! Patricia CALL read_map2D(co2trac(it)%file,'fco2',co2trac(it)%readstep,.FALSE.,dtr_add(:,it))
378	CALL read_map2D(co2trac(it)%file,'fco2',co2trac(it)%readstep,.TRUE.,dtr_add(:,it))
379
380	! Converte from kgC/m2/h to kgC/m2/s
381	dtr_add(:,it) = dtr_add(:,it)/3600
382	! Add individual treatment of values read from file
383	SELECT CASE(co2trac(it)%name)
384	CASE('fCO2_land')
385	dtr_add(:,it) = dtr_add(:,it) *pctsrf(:,is_ter)
386	CASE('fCO2_land_use')
387	dtr_add(:,it) = dtr_add(:,it) *pctsrf(:,is_ter)
388	CASE('fCO2_ocn')
389	dtr_add(:,it) = dtr_add(:,it) *pctsrf(:,is_oce)
390	! Patricia :
391	! CASE('fCO2_fos_fuel')
392	! dtr_add(:,it) = dtr_add(:,it)/mth_len
393	! co2trac(it)%readstep = 0 ! Always read same value for fossil fuel(Cadule case)
394	END SELECT
395	END IF
396	END IF
397	END DO
398
399	! 4) Update co2 tracers :
400	! Loop over all carbon tracers and add source
401	! ------------------------------------------------------------------
402	IF (carbon_cycle_tr) THEN
403	DO it = 1, ntr_co2
404	IF (.FALSE.) THEN
405	tr_seri(1:klon,1,co2trac(it)%id) = tr_seri(1:klon,1,co2trac(it)%id) + dtr_add(1:klon,it)
406	source(1:klon,co2trac(it)%id) = 0.
407	ELSE
408	source(1:klon,co2trac(it)%id) = dtr_add(1:klon,it)
409	END IF
410	END DO
411	END IF
412
413
414	! 5) Calculations for new CO2 value for the radiation scheme(instead of reading value from .def)
415	! ----------------------------------------------------------------------------------------------
416	IF (RCO2_inter) THEN
417	! Cumulate fluxes from ORCHIDEE at each timestep
418	IF (.NOT. carbon_cycle_tr .AND. carbon_cycle_cpl) THEN
419	IF (newday) THEN ! Reset cumulative variables once a day
420	fco2_land_day(1:klon) = 0.
421	fco2_lu_day(1:klon) = 0.
422	END IF
423	fco2_land_day(1:klon) = fco2_land_day(1:klon) + fco2_land_inst(1:klon) ![gC/m2/day]
424	fco2_lu_day(1:klon) = fco2_lu_day(1:klon) + fco2_lu_inst(1:klon) ![gC/m2/day]
425	END IF
426
427	! At the end of a new day, calculate a mean scalare value of CO2
428	! JG : Ici on utilise uniquement le traceur du premier couche du modele. Est-ce que c'est correcte ?
429	IF (endday) THEN
430
431	IF (carbon_cycle_tr) THEN
432	! Sum all co2 tracers to get the total delta CO2 flux
433	fco2_tmp(:) = 0.
434	DO it = 1, ntr_co2
435	fco2_tmp(1:klon) = fco2_tmp(1:klon) + tr_seri(1:klon,1,co2trac(it)%id)
436	END DO
437
438	ELSE IF (carbon_cycle_cpl) THEN ! no carbon_cycle_tr
439	! Sum co2 fluxes comming from coupled models and parameter for fossil fuel
440	fco2_tmp(1:klon) = fos_fuel_s + ((fco2_lu_day(1:klon) + fco2_land_day(1:klon))*pctsrf(1:klon,is_ter) &
441	+ fco2_ocn_day(:)pctsrf(:,is_oce)) fact
442	END IF
443
444	! Calculate a global mean value of delta CO2 flux
445	fco2_tmp(1:klon) = fco2_tmp(1:klon) * airephy(1:klon)
446	CALL reduce_sum(SUM(fco2_tmp),sumtmp)
447	CALL bcast(sumtmp)
448	delta_co2_ppm = sumtmp/airetot
449
450	! Add initial value for co2_ppm and delta value
451	co2_ppm = co2_ppm0 + delta_co2_ppm
452
453	! Transformation of atmospheric CO2 concentration for the radiation code
454	RCO2 = co2_ppm * 1.0e-06 * 44.011/28.97
455
456	WRITE(lunout,*) 'RCO2 is now updated! RCO2 = ', RCO2
457	END IF ! endday
458
459	END IF ! RCO2_inter
460
461
462	! 6) Calculate CO2 flux to send to ocean and land models : PISCES and ORCHIDEE
463	! ----------------------------------------------------------------------------
464	IF (carbon_cycle_cpl) THEN
465
466	IF (carbon_cycle_tr) THEN
467	! Sum all co2 tracers to get the total delta CO2 flux at first model layer
468	fco2_tmp(:) = 0.
469	DO it = 1, ntr_co2
470	fco2_tmp(1:klon) = fco2_tmp(1:klon) + tr_seri(1:klon,1,co2trac(it)%id)
471	END DO
472	co2_send(1:klon) = fco2_tmp(1:klon) + co2_ppm0
473	ELSE
474	! Send a scalare value in 2D variable to ocean and land model (PISCES and ORCHIDEE)
475	co2_send(1:klon) = co2_ppm
476	END IF
477
478	END IF
479
480	END SUBROUTINE carbon_cycle
481
482	END MODULE carbon_cycle_mod

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