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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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slide1

Evaluation of the globalbiospheric model ORCHIDEEagainst FLUXNET flux data

J. Ogée – N. Viovy –

P. Friedlingstein – P. Ciais

G. Krinner – N. deNoblet

J. Polcher

(IPSL)

slide2

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

slide3

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

slide4

FluxNet Network

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

slide5

Sites used here

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

slide6

Meteorological forcing

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

- global radiation: ECMWF ERA-15 analysis

- other: closest weather station

Tmax

temperature

Tmin

time

slide7

[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

slide8

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)

slide9

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)

slide10

ORCHIDEE

EC measurements

Seasonally (JJA) bin-averaged diurnal cycles

Rn

(W/m2)

H

(W/m2)

LE

(W/m2)

NEE

(µmol/m2/mth)

slide11

ORCHIDEE

EC measurements

Bin-averaged seasonal cycles

Rn

(MJ/m2/mth)

H

(MJ/m2/mth)

LE

(MJ/m2/mth)

NEE

(gC/m2/mth)

slide12

Forêts tempérées vs. autres PFTs

ORCHIDEE pas trop mal sur les forêts tempérées

sauf les écosystèmes méditétannéens

slide17

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

slide18

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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