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


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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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Evaluation of the globalbiospheric model ORCHIDEEagainst 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, 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


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


FluxNet Network

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


Sites used here

i.e. 31 sites, nearly 100 years of data


Meteorological forcing

« Gap-filling » method = use of daily data from:

- global radiation: ECMWF ERA-15 analysis

- other: closest weather station

Tmax

temperature

Tmin

time


[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


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)


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)


ORCHIDEE

EC measurements

Seasonally (JJA) bin-averaged diurnal cycles

Rn

(W/m2)

H

(W/m2)

LE

(W/m2)

NEE

(µmol/m2/mth)


ORCHIDEE

EC measurements

Bin-averaged seasonal cycles

Rn

(MJ/m2/mth)

H

(MJ/m2/mth)

LE

(MJ/m2/mth)

NEE

(gC/m2/mth)


Forêts tempérées vs. autres PFTs

ORCHIDEE pas trop mal sur les forêts tempérées

sauf les écosystèmes méditétannéens






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


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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