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carbon_cycle_mod.F90 @ 2128

Last change on this file since 2128 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

Also added the files defining the CeCILL version 2 license, in French
and English, at the top of the LMDZ tree.

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

Rev	Line
[1227]	1	MODULE carbon_cycle_mod
[1454]	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	!
[1227]	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
[1250]	16	LOGICAL, PUBLIC :: carbon_cycle_tr ! 3D transport of CO2 in the atmosphere, parameter read in conf_phys
[1249]	17	!$OMP THREADPRIVATE(carbon_cycle_tr)
[1250]	18	LOGICAL, PUBLIC :: carbon_cycle_cpl ! Coupling of CO2 fluxes between LMDZ/ORCHIDEE and LMDZ/OCEAN(PISCES)
[1249]	19	!$OMP THREADPRIVATE(carbon_cycle_cpl)
[1454]	20
[1759]	21	LOGICAL :: carbon_cycle_emis_comp_omp=.FALSE.
[1227]	22	LOGICAL :: carbon_cycle_emis_comp=.FALSE. ! Calculation of emission compatible
[1454]	23	!$OMP THREADPRIVATE(carbon_cycle_emis_comp)
[1227]	24
[1759]	25	LOGICAL :: RCO2_inter_omp
[1454]	26	LOGICAL :: RCO2_inter ! RCO2 interactive : if true calculate new value RCO2 for the radiation scheme
	27	!$OMP THREADPRIVATE(RCO2_inter)
	28
[1227]	29	! Scalare values when no transport, from physiq.def
[1759]	30	REAL :: fos_fuel_s_omp
[1227]	31	REAL :: fos_fuel_s ! carbon_cycle_fos_fuel dans physiq.def
[1250]	32	!$OMP THREADPRIVATE(fos_fuel_s)
[1227]	33	REAL :: emis_land_s ! not yet implemented
[1250]	34	!$OMP THREADPRIVATE(emis_land_s)
[1227]	35
[1454]	36	REAL :: airetot ! Total area of the earth surface
	37	!$OMP THREADPRIVATE(airetot)
[1250]	38
[1454]	39	INTEGER :: ntr_co2 ! Number of tracers concerning the carbon cycle
	40	!$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
[1250]	44	!$OMP THREADPRIVATE(fco2_ocn_day)
[1454]	45
[1227]	46	REAL, DIMENSION(:), ALLOCATABLE :: fco2_land_day ! flux CO2 from land for 1 day (cumulated) [gC/m2/d]
[1250]	47	!$OMP THREADPRIVATE(fco2_land_day)
[1227]	48	REAL, DIMENSION(:), ALLOCATABLE :: fco2_lu_day ! Emission from land use change for 1 day (cumulated) [gC/m2/d]
[1250]	49	!$OMP THREADPRIVATE(fco2_lu_day)
[1227]	50
[1454]	51	REAL, DIMENSION(:,:), ALLOCATABLE :: dtr_add ! Tracer concentration to be injected
	52	!$OMP THREADPRIVATE(dtr_add)
	53
	54	! Following 2 fields will be allocated and initialized in surf_land_orchidee
[1227]	55	REAL, DIMENSION(:), ALLOCATABLE, PUBLIC :: fco2_land_inst ! flux CO2 from land at one time step
[1250]	56	!$OMP THREADPRIVATE(fco2_land_inst)
[1227]	57	REAL, DIMENSION(:), ALLOCATABLE, PUBLIC :: fco2_lu_inst ! Emission from land use change at one time step
[1250]	58	!$OMP THREADPRIVATE(fco2_lu_inst)
[1227]	59
	60	! Calculated co2 field to be send to the ocean via the coupler and to ORCHIDEE
[1454]	61	REAL, DIMENSION(:), ALLOCATABLE, PUBLIC :: co2_send ! Field allocated in phyetat0
[1250]	62	!$OMP THREADPRIVATE(co2_send)
[1227]	63
[1454]	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
[1227]	78	CONTAINS
	79
[1454]	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
[1227]	87	USE dimphy
[1454]	88	USE comgeomphy
	89	USE mod_phys_lmdz_transfert_para
[1227]	90	USE infotrac
	91	USE IOIPSL
	92	USE surface_data, ONLY : ok_veget, type_ocean
[1454]	93	USE phys_cal_mod, ONLY : mth_len
[1227]	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]
[1454]	101	REAL,INTENT(IN) :: pdtphys ! length of time step in physiq (sec)
[1227]	102
	103	! InOutput arguments
	104	LOGICAL,DIMENSION(nbtr), INTENT(INOUT) :: aerosol
	105	LOGICAL,DIMENSION(nbtr), INTENT(INOUT) :: radio
	106
	107	! Local variables
[1454]	108	INTEGER :: ierr, it, iiq, itc
	109	INTEGER :: teststop
[1227]	110
	111
	112
[1454]	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
[1759]	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
[1227]	123	WRITE(lunout,*) 'carbon_cycle_fos_fuel = ', fos_fuel_s
	124	END IF
	125
	126
[1454]	127	! Read parmeter for calculation compatible emission
	128	IF (.NOT. carbon_cycle_tr) THEN
[1759]	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	!$OMP BARRIER
	134	carbon_cycle_emis_comp=carbon_cycle_emis_comp_omp
[1454]	135	WRITE(lunout,*) 'carbon_cycle_emis_comp = ',carbon_cycle_emis_comp
	136	IF (carbon_cycle_emis_comp) THEN
	137	CALL abort_gcm('carbon_cycle_init', 'carbon_cycle_emis_comp option not yet implemented!!',1)
	138	END IF
	139	END IF
[1227]	140
[1454]	141	! Read parameter for interactive calculation of the CO2 value for the radiation scheme
[1759]	142	!$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
[1454]	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
[1227]	153
[1454]	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)
[1227]	160
[1454]	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
[1227]	173	END IF
[1454]	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
[1227]	230
[1454]	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
[1227]	244
[1454]	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
[1227]	254	ALLOCATE(fco2_land_day(klon), stat=ierr)
[1454]	255	IF (ierr /= 0) CALL abort_gcm('carbon_cycle_init', 'pb in allocation 2',1)
	256	fco2_land_day(1:klon) = 0.
	257
[1227]	258	ALLOCATE(fco2_lu_day(klon), stat=ierr)
[1454]	259	IF (ierr /= 0) CALL abort_gcm('carbon_cycle_init', 'pb in allocation 3',1)
	260	fco2_lu_day(1:klon) = 0.
[1227]	261	END IF
	262	END IF
	263
[1454]	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)
[1227]	287	END IF
[1454]	288
	289	! 5) Calculate total area of the earth surface
	290	! --------------------------------------------
	291	CALL reduce_sum(SUM(airephy),airetot)
	292	CALL bcast(airetot)
[1227]	293
	294	END SUBROUTINE carbon_cycle_init
	295
[1454]	296
	297	SUBROUTINE carbon_cycle(nstep, pdtphys, pctsrf, tr_seri, source)
	298	! Subroutine for injection of co2 in the tracers
[1227]	299	!
[1454]	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)
[1227]	304
	305	USE infotrac
	306	USE dimphy
[1454]	307	USE mod_phys_lmdz_transfert_para
[1227]	308	USE phys_cal_mod, ONLY : mth_cur, mth_len
	309	USE phys_cal_mod, ONLY : day_cur
	310	USE comgeomphy
[1785]	311	USE indice_sol_mod
[1227]	312
	313	IMPLICIT NONE
	314
	315	INCLUDE "clesphys.h"
[1454]	316	INCLUDE "iniprint.h"
	317	INCLUDE "YOMCST.h"
[1227]	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)
[1454]	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
[1227]	325
	326	! Local variables
[1454]	327	INTEGER :: it
[1227]	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
[1454]	333	REAL, DIMENSION(klon) :: fco2_tmp
[1227]	334	REAL :: sumtmp
	335	REAL :: delta_co2_ppm
	336
	337
[1454]	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
[1227]	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.
[1454]	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.
[1227]	354	END IF
[1454]	355	END DO
[1227]	356
[1454]	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))
[1227]	379
[1454]	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
[1227]	395	END IF
[1454]	396	END IF
	397	END DO
[1227]	398
[1454]	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)
[1227]	409	END IF
[1454]	410	END DO
[1227]	411	END IF
	412
	413
[1454]	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
[1227]	426
[1454]	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
[1227]	430
[1454]	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
[1227]	437
[1454]	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
[1227]	442	END IF
	443
[1454]	444	! Calculate a global mean value of delta CO2 flux
	445	fco2_tmp(1:klon) = fco2_tmp(1:klon) * airephy(1:klon)
[1227]	446	CALL reduce_sum(SUM(fco2_tmp),sumtmp)
[1454]	447	CALL bcast(sumtmp)
[1227]	448	delta_co2_ppm = sumtmp/airetot
	449
[1454]	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
[1227]	458
[1454]	459	END IF ! RCO2_inter
[1227]	460
	461
[1454]	462	! 6) Calculate CO2 flux to send to ocean and land models : PISCES and ORCHIDEE
	463	! ----------------------------------------------------------------------------
	464	IF (carbon_cycle_cpl) THEN
	465
[1227]	466	IF (carbon_cycle_tr) THEN
[1454]	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
[1227]	473	ELSE
	474	! Send a scalare value in 2D variable to ocean and land model (PISCES and ORCHIDEE)
[1454]	475	co2_send(1:klon) = co2_ppm
[1227]	476	END IF
	477
	478	END IF
	479
	480	END SUBROUTINE carbon_cycle
	481
	482	END MODULE carbon_cycle_mod

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