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J. Ogée – N. Viovy – P. Friedlingstein – P. Ciais G. Krinner – N. deNoblet J. Polcher (IPSL)

Evaluation of the global biospheric model ORCHIDEE against FLUXNET flux data. J. Ogée – N. Viovy – P. Friedlingstein – P. Ciais G. Krinner – N. deNoblet J. Polcher (IPSL). meteorological forcing. output variables. sensible & latent heat fluxes, CO 2 flux, net radiation.

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J. Ogée – N. Viovy – P. Friedlingstein – P. Ciais G. Krinner – N. deNoblet J. Polcher (IPSL)

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  1. Evaluation of the globalbiospheric model ORCHIDEEagainst FLUXNET flux data J. Ogée – N. Viovy – P. Friedlingstein – P. Ciais G. Krinner – N. deNoblet J. Polcher (IPSL)

  2. meteorological forcing output variables sensible & latent heat fluxes, CO2 flux, net radiation rain, température, humidity, incoming radiation, wind, CO2 SECHIBA energy & water cycle photosynthesis ORCHIDEE Dt = 1 hour LAI, roughness, albedo soil water, surface temperature, GPP STOMATE vegetation & soil carbon cycle (phénologie, allocation,…) LPJ spatial distribution of vegetation (competition, fire,…) vegetation types Dt = 1 day Dt = 1 year prescribed vegetation Global biospheric model ORCHIDEE NPP, biomass, litterfall vegetation types

  3. prescribed parameters vegetation types, latitude/longitude meteorological forcing rain, température, humidity, incoming radiation, wind, CO2 sensible & latent heat fluxes, CO2 flux, net radiation “modelled” fluxes “measured” fluxes VALIDATION General framework for model evaluation ORCHIDEE FluxNet

  4. FluxNet Network More than 140 sites across the world (mainly N. Hemisphere)

  5. Sites used here i.e. 31 sites, nearly 100 years of data

  6. Meteorological forcing « Gap-filling » method = use of daily data from: - global radiation: ECMWF ERA-15 analysis - other: closest weather station Tmax temperature Tmin time

  7. [C] = 0 [C]  0 [C]  0 Site history Hypothesis = ecosystems « in equilibrium » N yrs 250 yrs SNEEmod = 0 correction to account for measured sink mineral soil seeded (according to prescribed vegetation distribution) organic soil ecosystem equilibrium reached N yrs of meteorological forcing

  8. EC measurements ORCHIDEE 10-day bin-averaged fluxes (Tver forest) Rn (W m-2) H (W m-2) LE (W m-2) NEE (µmol m-2 s-1)

  9. EC measurements ORCHIDEE Daily and accumulated fluxes (Tver forest) Rn (MJ m-2) H (MJ m-2) LE (MJ m-2) NEE (gC m-2)

  10. ORCHIDEE EC measurements Seasonally (JJA) bin-averaged diurnal cycles Rn (W/m2) H (W/m2) LE (W/m2) NEE (µmol/m2/mth)

  11. ORCHIDEE EC measurements Bin-averaged seasonal cycles Rn (MJ/m2/mth) H (MJ/m2/mth) LE (MJ/m2/mth) NEE (gC/m2/mth)

  12. Forêts tempérées vs. autres PFTs ORCHIDEE pas trop mal sur les forêts tempérées sauf les écosystèmes méditétannéens

  13. Quelques résultats de PILPS Carbone

  14. Slope/intercept and RMSE unsys/sysFor the different models (3 hourly fluxes)

  15. Index of agreement for all models

  16. Modeled and simulated carbon net sink In 1997 and 1998

  17. Annual NEE (Kg C m-2 y-1) Annual GPP (Kg C m-2 y-1) CLASS-MCM CLASS-UA CLASS-MCM CLASS-UA ORCHIDEE-1 ORCHIDEE-1 ORCHIDEE-2 ORCHIDEE-2 IBIS SWAP IBIS AVIM MC

  18. Total Soil carbon (Kg C/m-2) Total living biomass (Kg C/m-2) CLASS-MCM CLASS-UA CLASS-MCM CLASS-UA ORCHIDEE-1 ORCHIDEE-2 ORCHIDEE-1 ORCHIDEE-2 SWAP VISA SWAP VISA MC IBIS IBIS MC AVIM AVIM

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