source: LMDZ6/branches/Amaury_dev/libf/phylmd/tracco2i_mod.F90 @ 5220

MODULE tracco2i_mod

  ! This module does the work for the interactive CO2 tracers
  ! Authors: Patricia Cadule and Olivier Boucher

  ! Purpose and description:
  !  -----------------------
  ! Main routine for the interactive carbon cycle
  ! Gather all carbon fluxes and emissions from ORCHIDEE, PISCES and fossil fuel
  ! Compute the net flux in source field which is used in phytrac
  ! Compute global CO2 mixing ratio for radiation scheme if option is activated
  ! Redistribute CO2 evenly over the atmosphere if transport is desactivated

CONTAINS

  SUBROUTINE tracco2i_init()
    ! This SUBROUTINE calls carbon_cycle_init needed to be done before first CALL to phys_output_write in physiq.
    USE carbon_cycle_mod, ONLY: carbon_cycle_init, carbon_cycle_cpl

    ! Initialize carbon_cycle_mod
    IF (carbon_cycle_cpl) THEN
      CALL carbon_cycle_init()
    ENDIF

  END SUBROUTINE tracco2i_init

  SUBROUTINE tracco2i(pdtphys, debutphy, &
          xlat, xlon, pphis, pphi, &
          t_seri, pplay, paprs, tr_seri, source)

    USE dimphy
    USE infotrac_phy, ONLY: nbtr
    USE lmdz_geometry, ONLY: cell_area
    USE carbon_cycle_mod, ONLY: id_CO2, nbcf_in, fields_in, cfname_in
    USE carbon_cycle_mod, ONLY: fco2_ocn_day, fco2_ff, fco2_bb, fco2_land, fco2_ocean
    USE carbon_cycle_mod, ONLY: read_fco2_ocean_cor, var_fco2_ocean_cor, fco2_ocean_cor
    USE carbon_cycle_mod, ONLY: read_fco2_land_cor, var_fco2_land_cor, fco2_land_cor
    USE carbon_cycle_mod, ONLY: co2_send
    USE carbon_cycle_mod, ONLY: fco2_land_nbp, fco2_land_nep, fco2_land_fLuc
    USE carbon_cycle_mod, ONLY: fco2_land_fwoodharvest, fco2_land_fHarvest
    USE carbon_cycle_mod, ONLY: carbon_cycle_cpl, carbon_cycle_tr, carbon_cycle_rad, RCO2_glo, RCO2_tot
    USE carbon_cycle_mod, ONLY: ocean_area_tot
    USE carbon_cycle_mod, ONLY: land_area_tot
    USE lmdz_grid_phy
    USE lmdz_phys_mpi_data, ONLY: is_mpi_root
    USE lmdz_phys_para, ONLY: gather, bcast, scatter
    USE lmdz_phys_omp_data, ONLY: is_omp_root
    USE phys_cal_mod
    USE phys_state_var_mod, ONLY: pctsrf
    USE indice_sol_mod, ONLY: nbsrf, is_ter, is_lic, is_oce, is_sic
    USE lmdz_clesphys
    USE lmdz_yomcst

    IMPLICIT NONE

    ! Input argument
    !---------------
    REAL, INTENT(IN) :: pdtphys    ! Pas d'integration pour la physique (seconde)
    LOGICAL, INTENT(IN) :: debutphy   ! le flag de l'initialisation de la physique

    REAL, DIMENSION(klon), INTENT(IN) :: xlat    ! latitudes pour chaque point
    REAL, DIMENSION(klon), INTENT(IN) :: xlon    ! longitudes pour chaque point
    REAL, DIMENSION(klon), INTENT(IN) :: pphis   ! geopotentiel du sol
    REAL, DIMENSION(klon, klev), INTENT(IN) :: pphi    ! geopotentiel de chaque couche

    REAL, DIMENSION(klon, klev), INTENT(IN) :: t_seri  ! Temperature
    REAL, DIMENSION(klon, klev), INTENT(IN) :: pplay   ! pression pour le mileu de chaque couche (en Pa)
    REAL, DIMENSION(klon, klev + 1), INTENT(IN) :: paprs   ! pression pour chaque inter-couche (en Pa)
    REAL, DIMENSION(klon, nbtr), INTENT(INOUT) :: source  ! flux de traceur [U/m2/s]

    ! Output argument
    !----------------
    REAL, DIMENSION(klon, klev, nbtr), INTENT(INOUT) :: tr_seri ! Concentration Traceur [U/kgA]

    ! Local variables
    !----------------

    INTEGER :: it, k, i, nb
    REAL, DIMENSION(klon, klev) :: m_air     ! mass of air in every grid box [kg]
    REAL, DIMENSION(klon_glo, klev) :: co2_glo   ! variable temporaire sur la grille global
    REAL, DIMENSION(klon_glo, klev) :: m_air_glo ! variable temporaire sur la grille global
    REAL, DIMENSION(klon_glo, nbsrf) :: pctsrf_glo      !--fractions de maille sur la grille globale
    REAL, DIMENSION(klon_glo) :: pctsrf_ter_glo
    REAL, DIMENSION(klon_glo) :: pctsrf_oce_glo
    REAL, DIMENSION(klon_glo) :: pctsrf_sic_glo
    REAL, DIMENSION(klon_glo) :: cell_area_glo   !--aire des mailles sur la grille globale

    LOGICAL, SAVE :: check_fCO2_nbp_in_cfname
    !$OMP THREADPRIVATE(check_fCO2_nbp_in_cfname)
    INTEGER, SAVE :: day_pre = -1
    !$OMP THREADPRIVATE(day_pre)

    REAL, PARAMETER :: secinday = 86400.

    IF (is_mpi_root) THEN
      PRINT *, 'in tracco2i: date from phys_cal_mod =', year_cur, '-', mth_cur, '-', day_cur, '-', hour
    ENDIF

    !--initialisation of CO2 field if not in restart file
    !--dirty way of doing, do it better later
    !--convert 280 ppm into kg CO2 / kg air
    IF (debutphy) THEN

      ! Initialization of tr_seri(id_CO2) If it is not initialized
      IF (MAXVAL(tr_seri(:, :, id_CO2))<1.e-15) THEN
        tr_seri(:, :, id_CO2) = co2_ppm0 * 1.e-6 / RMD * RMCO2 !--initialised from co2_ppm0 in rdem
      ENDIF

      !--check if fCO2_nbp is in
      check_fCO2_nbp_in_cfname = .FALSE.
      DO nb = 1, nbcf_in
        IF (cfname_in(nb)=="fCO2_nbp") check_fCO2_nbp_in_cfname = .TRUE.
      ENDDO

      CALL gather(pctsrf, pctsrf_glo)
      CALL gather(pctsrf(:, is_ter), pctsrf_ter_glo)
      CALL gather(pctsrf(:, is_oce), pctsrf_oce_glo)
      CALL gather(pctsrf(:, is_sic), pctsrf_sic_glo)
      CALL gather(cell_area(:), cell_area_glo)

    ENDIF

    !--calculate mass of air in every grid box in kg air
    DO i = 1, klon
      DO k = 1, klev
        m_air(i, k) = (paprs(i, k) - paprs(i, k + 1)) / RG * cell_area(i)
      ENDDO
    ENDDO

    !--CALL CO2 emission routine
    !--co2bb is zero for now
    !--unit kg CO2 m-2 s-1
    CALL co2_emissions(debutphy)

    !--retrieving land and ocean CO2 flux
    fco2_land(:) = 0.0
    fco2_ocean(:) = 0.0
    fco2_land_nbp(:) = 0.
    fco2_land_nep(:) = 0.
    fco2_land_fLuc(:) = 0.
    fco2_land_fwoodharvest(:) = 0.
    fco2_land_fHarvest(:) = 0.

    DO nb = 1, nbcf_in

      SELECT CASE(cfname_in(nb))
        !--dealing with the different fluxes coming from ORCHIDEE
        !--fluxes come in unit of kg C m-2 s-1 is converted into kg CO2 m-2 s-1
      CASE("fCO2_nep")
        fco2_land_nep(:) = fields_in(:, nb) * RMCO2 / RMC * pctsrf(:, is_ter)
      CASE("fCO2_fLuc")
        fco2_land_fLuc(:) = fields_in(:, nb) * RMCO2 / RMC * pctsrf(:, is_ter)
      CASE("fCO2_fwoodharvest")
        fco2_land_fwoodharvest(:) = fields_in(:, nb) * RMCO2 / RMC * pctsrf(:, is_ter)
      CASE("fCO2_fHarvest")
        fco2_land_fHarvest(:) = fields_in(:, nb) * RMCO2 / RMC * pctsrf(:, is_ter)
      CASE("fCO2_nbp")
        fco2_land_nbp(:) = fields_in(:, nb) * RMCO2 / RMC * pctsrf(:, is_ter)
        !--fCO2_fco2_ocn comes in unit of mol C02 m-2 s-1 is converted into kg CO2 m-2 s-1 + change sign
      CASE("fCO2_fgco2")
        fco2_ocean(:) = -1. * fco2_ocn_day(:) * RMCO2 / 1.e3 * (pctsrf(:, is_oce) + pctsrf(:, is_sic))
      END SELECT

    ENDDO

    PRINT *, 'tracco2i_mod.F90 --- read_fco2_ocean_cor ', read_fco2_ocean_cor
    PRINT *, 'tracco2i_mod.F90 --- read_fco2_land_cor ', read_fco2_land_cor

    IF (debutphy) THEN

      IF (read_fco2_ocean_cor) THEN
        !$OMP MASTER
        IF (is_mpi_root .AND. is_omp_root) THEN
          ocean_area_tot = 0.
          PRINT *, 'tracco2i_mod.F90 --- var_fco2_ocean_cor (PgC/yr) ', var_fco2_ocean_cor
          DO i = 1, klon_glo
            ocean_area_tot = ocean_area_tot + (pctsrf_oce_glo(i) + pctsrf_sic_glo(i)) * cell_area_glo(i)
          ENDDO
        ENDIF !--is_mpi_root and is_omp_root
        !$OMP END MASTER
        CALL bcast(ocean_area_tot)
        PRINT *, 'tracco2i_mod.F90 --- ocean_area_tot (debutphy) ', ocean_area_tot
      ENDIF

      IF (read_fco2_land_cor) THEN
        !$OMP MASTER
        IF (is_mpi_root .AND. is_omp_root) THEN
          land_area_tot = 0.
          PRINT *, 'tracco2i_mod.F90 --- var_fco2_land_cor (PgC/yr) ', var_fco2_land_cor
          DO i = 1, klon_glo
            land_area_tot = land_area_tot + pctsrf_ter_glo(i) * cell_area_glo(i)
          ENDDO
        ENDIF !--is_mpi_root and is_omp_root
        !$OMP END MASTER
        CALL bcast(land_area_tot)
        PRINT *, 'tracco2i_mod.F90 --- land_area_tot (debutphy) ', land_area_tot
      ENDIF

    ENDIF !-- debutphy  

    PRINT *, 'tracco2i_mod.F90 --- ocean_area_tot (m2) ', ocean_area_tot
    PRINT *, 'tracco2i_mod.F90 --- land_area_tot (m2) ', land_area_tot

    IF (read_fco2_ocean_cor) THEN
      ! var_fco2_ocean_cor: correction of the surface downward CO2 flux into the ocean fgco2 (PgC/yr)
      ! This is the correction of the the net air to ocean carbon flux. Positive flux is into the ocean.
      !    PRINT *, 'tracco2i_mod.F90 --- var_fco2_ocean_cor (PgC/yr) ',var_fco2_ocean_cor

      !var_fco2_ocean_cor: correction of the net air to ocean carbon flux (input data is a scalar in PgC/yr and must be converted in kg CO2 m-2 s-1)

      ! Factors for carbon and carbon dioxide
      ! 1 mole CO2 = 44.009 g CO2 = 12.011 g C
      ! 1 ppm by volume of atmosphere CO2 = 2.13 Gt C
      ! 1 gC = 44.009/12.011 gCO2

      ! ocean_area_tot: ocean area (m2)

      ! year_len: year length (in days)

      ! conversion: PgC/yr --> kg CO2 m-2 s-1
      ! fco2_ocean_cor  / (86400.*year_len): PgC/yr to PgC/s
      ! fco2_ocean_cor  / (86400.*year_len)*(pctsrf(i,is_oce)+pctsrf(i,is_sic))/ocean_area_tot: PgC/s to PgC/s/m2
      ! (fco2_ocean_cor / (86400.*year_len)*(pctsrf(i,is_oce)+pctsrf(i,is_sic))/ocean_area_tot) *1e12: PgC/s/m2 to kgC/s/m2
      ! (fco2_ocean_cor / (86400.*year_len)*(pctsrf(i,is_oce)+pctsrf(i,is_sic))/ocean_area_tot) * 1e12 * (RMCO2/RMC): kgC/s/m2 to kgCO2/s/m2

      DO i = 1, klon
        fco2_ocean_cor(i) = (var_fco2_ocean_cor * (RMCO2 / RMC) &
                * (pctsrf(i, is_oce) + pctsrf(i, is_sic)) / ocean_area_tot &
                / (secinday * year_len)) * 1.e12
      ENDDO

      PRINT *, 'tracco2i_mod.F90 --- MINVAL(fco2_ocean_cor) ', MINVAL(fco2_ocean_cor)
      PRINT *, 'tracco2i_mod.F90 --- MAXVAL(fco2_ocean_cor) ', MAXVAL(fco2_ocean_cor)

    ELSE
      fco2_ocean_cor(:) = 0.
    ENDIF

    IF (read_fco2_land_cor) THEN
      ! var_fco2_land_cor: correction of the carbon Mass Flux out of Atmosphere Due to Net Biospheric Production on Land  (PgC/yr)
      ! This is the correction of the net mass flux of carbon between land and atmosphere calculated as
      ! photosynthesis MINUS the sum of plant and soil respiration, carbon fluxes from
      ! fire, harvest, grazing and land use change. Positive flux is into the land.
      !    PRINT *, 'tracco2i_mod.F90 --- var_fco2_land_cor (m2) ',var_fco2_land_cor

      !var_fco2_land_cor: correction of the et air to land carbon flux (input data is a scalar in PgC/yr and must be converted in kg CO2 m-2 s-1)

      ! Factors for carbon and carbon dioxide
      ! 1 mole CO2 = 44.009 g CO2 = 12.011 g C
      ! 1 ppm by volume of atmosphere CO2 = 2.13 Gt C
      ! 1 gC = 44.009/12.011 gCO2

      ! land_area_tot: land area (m2)

      ! year_len: year length (in days)

      ! conversion: PgC/yr --> kg CO2 m-2 s-1
      ! fco2_land_cor  / (86400.*year_len): PgC/yr to PgC/s
      ! fco2_land_cor  / (86400.*year_len)*pctsrf(i,is_ter)/land_area_tot: PgC/s to PgC/s/m2
      ! (fco2_land_cor / (86400.*year_len)*pctsrf(i,is_ter)/land_area_tot) *1e12: PgC/s/m2 to kgC/s/m2
      ! (fco2_land_cor / (86400.*year_len)*pctsrf(i,is_ter)/land_area_tot) * 1e12 * (RMCO2/RMC): kgC/s/m2 to kgCO2/s/m2

      DO i = 1, klon
        fco2_land_cor(i) = var_fco2_land_cor * RMCO2 / RMC * pctsrf(i, is_ter) / land_area_tot / (secinday * year_len) * 1.e12
      ENDDO

      PRINT *, 'tracco2i_mod.F90 --- MINVAL(fco2_land_cor) ', MINVAL(fco2_land_cor)
      PRINT *, 'tracco2i_mod.F90 --- MAXVAL(fco2_land_cor) ', MAXVAL(fco2_land_cor)

    ELSE
      fco2_land_cor(:) = 0.
    ENDIF

    !--if fCO2_nbp is transferred we use it, otherwise we use the sum of what has been passed from ORCHIDEE
    IF (check_fCO2_nbp_in_cfname)  THEN
      fco2_land(:) = fco2_land_nbp(:)
    ELSE
      fco2_land(:) = fco2_land_nep(:) + fco2_land_fLuc(:) + fco2_land_fwoodharvest(:) + fco2_land_fHarvest(:)
    ENDIF

    !!--preparing the net anthropogenic flux at the surface for mixing layer
    !!--unit kg CO2 / m2 / s
    !    PRINT *, 'tracco2i_mod.F90 --- MAXVAL(fco2_ff) ',MAXVAL(fco2_ff)
    !    PRINT *, 'tracco2i_mod.F90 --- MINVAL(fco2_ff) ',MINVAL(fco2_ff)
    !    PRINT *, 'tracco2i_mod.F90 --- MAXVAL(fco2_bb) ',MAXVAL(fco2_bb)
    !    PRINT *, 'tracco2i_mod.F90 --- MINVAL(fco2_bb) ',MINVAL(fco2_bb)
    !    PRINT *, 'tracco2i_mod.F90 --- MAXVAL(fco2_land) ',MAXVAL(fco2_land)
    !    PRINT *, 'tracco2i_mod.F90 --- MINVAL(fco2_land) ',MINVAL(fco2_land)
    !    PRINT *, 'tracco2i_mod.F90 --- MAXVAL(fco2_ocean) ',MAXVAL(fco2_ocean)
    !    PRINT *, 'tracco2i_mod.F90 --- MINVAL(fco2_ocean) ',MINVAL(fco2_ocean)
    !    PRINT *, 'tracco2i_mod.F90 --- MAXVAL(source(:,id_CO2)) ',MAXVAL(source(:,id_CO2))
    !    PRINT *, 'tracco2i_mod.F90 --- MINVAL(source(:,id_CO2)) ',MINVAL(source(:,id_CO2))

    !--build final source term for CO2
    source(:, id_CO2) = fco2_ff(:) + fco2_bb(:) + fco2_land(:) + fco2_ocean(:) - fco2_ocean_cor(:) - fco2_land_cor(:)

    !--computing global mean CO2 for radiation
    !--for every timestep comment out the IF ENDIF statements
    !--otherwise this is updated every day
    IF (debutphy.OR.day_cur/=day_pre) THEN

      CALL gather(tr_seri(:, :, id_CO2), co2_glo)
      CALL gather(m_air, m_air_glo)

      !$OMP MASTER

      !--compute a global mean CO2 value and print its value in ppm
      IF (is_mpi_root .AND. is_omp_root) THEN
        RCO2_tot = SUM(co2_glo * m_air_glo)  !--unit kg CO2
        RCO2_glo = RCO2_tot / SUM(m_air_glo) !--unit kg CO2 / kg air
        ! the following operation is only to maintain precision consistency
        ! of RCO2_glo which differs whether it is directly computed or read from
        ! a restart file (after having been computed)
        RCO2_glo = FLOAT(INT(RCO2_glo * 1e8)) / 1e8
        PRINT *, 'tracco2i: global CO2 in ppm =', RCO2_glo * 1.e6 * RMD / RMCO2
        PRINT *, 'tracco2i: total CO2 in kg =', RCO2_tot
      ENDIF
      !$OMP END MASTER
      CALL bcast(RCO2_glo)
      day_pre = day_cur

      !--if not carbon_cycle_tr, then we reinitialize the CO2 each day to its global mean value
      IF (.NOT.carbon_cycle_tr) THEN
        tr_seri(:, :, id_CO2) = RCO2_glo
      ENDIF
    ENDIF

    PRINT *, 'tracco2i_mod.F90 --- MINVAL(tr_seri(:,1,id_CO2)*1.e6*RMD/RMCO2): L1: ', MINVAL(tr_seri(:, 1, id_CO2) * 1.e6 * RMD / RMCO2)
    PRINT *, 'tracco2i_mod.F90 --- MAXVAL(tr_seri(:,1,id_CO2)*1.e6*RMD/RMCO2): L1: ', MAXVAL(tr_seri(:, 1, id_CO2) * 1.e6 * RMD / RMCO2)

    PRINT *, 'tracco2i_mod.F90 --- MINVAL(tr_seri(:,79,id_CO2)*1.e6*RMD/RMCO2): L79: ', MINVAL(tr_seri(:, 79, id_CO2) * 1.e6 * RMD / RMCO2)
    PRINT *, 'tracco2i_mod.F90 --- MAXVAL(tr_seri(:,79,id_CO2)*1.e6*RMD/RMCO2): L79: ', MAXVAL(tr_seri(:, 79, id_CO2) * 1.e6 * RMD / RMCO2)

    co2_send(:) = tr_seri(:, 1, id_CO2) * 1.e6 * RMD / RMCO2

    PRINT *, 'tracco2i_mod.F90 --- MINVAL(co2_send) ', MINVAL(co2_send)
    PRINT *, 'tracco2i_mod.F90 --- MAXVAL(co2_send) ', MAXVAL(co2_send)

  END SUBROUTINE tracco2i

  SUBROUTINE co2_emissions(debutphy)

    USE dimphy
    !    USE infotrac_phy
    USE lmdz_geometry, ONLY: cell_area
    USE lmdz_grid_phy
    USE lmdz_phys_mpi_data, ONLY: is_mpi_root
    USE lmdz_phys_para, ONLY: gather, scatter
    USE phys_cal_mod

    USE netcdf95, ONLY: nf95_close, nf95_gw_var, nf95_inq_varid, nf95_open
    USE netcdf, ONLY: nf90_get_var, nf90_noerr, nf90_nowrite

    USE carbon_cycle_mod, ONLY: fco2_ff, fco2_bb, fco2_land, fco2_ocean
    USE lmdz_abort_physic, ONLY: abort_physic
    USE lmdz_yomcst

    IMPLICIT NONE

    LOGICAL, INTENT(IN) :: debutphy

    ! For NetCDF:
    INTEGER ncid_in  ! IDs for input files
    INTEGER varid, ncerr

    INTEGER :: n_glo, n_month
    REAL, ALLOCATABLE :: vector(:), time(:)
    REAL, ALLOCATABLE :: flx_co2ff_glo(:, :) !  fossil-fuel CO2
    REAL, ALLOCATABLE :: flx_co2bb_glo(:, :) !  biomass-burning CO2
    REAL, ALLOCATABLE, SAVE :: flx_co2ff(:, :)     !  fossil-fuel CO2
    REAL, ALLOCATABLE, SAVE :: flx_co2bb(:, :)     !  biomass-burning CO2
    !$OMP THREADPRIVATE(flx_co2ff,flx_co2bb)

    !! may be controlled via the .def later on
    !! also co2bb for now comes from ORCHIDEE
    LOGICAL, PARAMETER :: readco2ff = .TRUE.
    !! this should be left to FALSE for now
    LOGICAL, PARAMETER :: readco2bb = .FALSE.

    CHARACTER (len = 20) :: modname = 'tracco2i.co2_emissions'
    CHARACTER (len = 80) :: abort_message

    IF (debutphy) THEN

      ALLOCATE(flx_co2ff(klon, 12))
      ALLOCATE(flx_co2bb(klon, 12))

      !$OMP MASTER
      IF (is_mpi_root) THEN

        IF (.NOT.ALLOCATED(flx_co2ff_glo)) ALLOCATE(flx_co2ff_glo(klon_glo, 12))
        IF (.NOT.ALLOCATED(flx_co2bb_glo)) ALLOCATE(flx_co2bb_glo(klon_glo, 12))

        !--reading CO2 fossil fuel emissions
        IF (readco2ff) THEN

          ! ... Open the CO2ff file
          CALL nf95_open("sflx_lmdz_co2_ff.nc", nf90_nowrite, ncid_in)

          CALL nf95_inq_varid(ncid_in, "vector", varid)
          CALL nf95_gw_var(ncid_in, varid, vector)
          n_glo = size(vector)
          IF (n_glo/=klon_glo) THEN
            abort_message = 'sflx_lmdz_co2_ff: le nombre de points n est pas egal a klon_glo'
            CALL abort_physic(modname, abort_message, 1)
          ENDIF

          CALL nf95_inq_varid(ncid_in, "time", varid)
          CALL nf95_gw_var(ncid_in, varid, time)
          n_month = size(time)
          IF (n_month/=12) THEN
            abort_message = 'sflx_lmdz_co2_ff: le nombre de month n est pas egal a 12'
            CALL abort_physic(modname, abort_message, 1)
          ENDIF

          !--reading flx_co2 for fossil fuel
          CALL nf95_inq_varid(ncid_in, "flx_co2", varid)
          ncerr = nf90_get_var(ncid_in, varid, flx_co2ff_glo)

          CALL nf95_close(ncid_in)

        ELSE  !--co2ff not to be read
          flx_co2ff_glo(:, :) = 0.0
        ENDIF

        !--reading CO2 biomass burning emissions
        !--using it will be inconsistent with treatment in ORCHIDEE
        IF (readco2bb) THEN

          ! ... Open the CO2bb file
          CALL nf95_open("sflx_lmdz_co2_bb.nc", nf90_nowrite, ncid_in)

          CALL nf95_inq_varid(ncid_in, "vector", varid)
          CALL nf95_gw_var(ncid_in, varid, vector)
          n_glo = size(vector)
          IF (n_glo/=klon_glo) THEN
            abort_message = 'sflx_lmdz_co2_bb: le nombre de points n est pas egal a klon_glo'
            CALL abort_physic(modname, abort_message, 1)
          ENDIF

          CALL nf95_inq_varid(ncid_in, "time", varid)
          CALL nf95_gw_var(ncid_in, varid, time)
          n_month = size(time)
          IF (n_month/=12) THEN
            abort_message = 'sflx_lmdz_co2_bb: le nombre de month n est pas egal a 12'
            CALL abort_physic(modname, abort_message, 1)
          ENDIF

          !--reading flx_co2 for biomass burning
          CALL nf95_inq_varid(ncid_in, "flx_co2", varid)
          ncerr = nf90_get_var(ncid_in, varid, flx_co2bb_glo)

          CALL nf95_close(ncid_in)

        ELSE  !--co2bb not to be read
          flx_co2bb_glo(:, :) = 0.0
        ENDIF

      ENDIF
      !$OMP END MASTER

      ! Allocation needed for all proc otherwise scatter might complain
      IF (.NOT.ALLOCATED(flx_co2ff_glo)) ALLOCATE(flx_co2ff_glo(0, 0))
      IF (.NOT.ALLOCATED(flx_co2bb_glo)) ALLOCATE(flx_co2bb_glo(0, 0))

      !--scatter on all proc
      CALL scatter(flx_co2ff_glo, flx_co2ff)
      CALL scatter(flx_co2bb_glo, flx_co2bb)

      IF (ALLOCATED(flx_co2ff_glo)) DEALLOCATE(flx_co2ff_glo)
      IF (ALLOCATED(flx_co2bb_glo)) DEALLOCATE(flx_co2bb_glo)

    ENDIF !--end debuthy

    !---select the correct month
    IF (mth_cur<1.OR.mth_cur>12) THEN
      PRINT *, 'probleme avec le mois dans co2_ini =', mth_cur
    ENDIF

    fco2_ff(:) = flx_co2ff(:, mth_cur)
    fco2_bb(:) = flx_co2bb(:, mth_cur)

  END SUBROUTINE co2_emissions

END MODULE tracco2i_mod