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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.

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Presentation on theme: "J. Ogée – N. Viovy – P. Friedlingstein – P. Ciais G. Krinner – N. deNoblet J. Polcher (IPSL) Evaluation of the global biospheric model ORCHIDEE against."— Presentation transcript:

1 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

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

3 ORCHIDEE General framework for model evaluation FluxNet rain, température, humidity, incoming radiation, wind, CO 2 meteorological forcing vegetation types, latitude/longitude prescribed parameters sensible & latent heat fluxes, CO 2 flux, net radiation modelled fluxesmeasured fluxes VALIDATION

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 T max T min time temperature

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

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

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

10 Seasonally (JJA) bin-averaged diurnal cycles H (W/m 2 ) LE (W/m 2 ) R n (W/m 2 ) ORCHIDEE EC measurements NEE (µmol/m 2 /mth)

11 Bin-averaged seasonal cycles H (MJ/m 2 /mth) LE (MJ/m 2 /mth) NEE (gC/m 2 /mth) R n (MJ/m 2 /mth) ORCHIDEE EC measurements

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

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


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