ORCHIDEE-Dev : January 8th, 2013

Theme #1

Water cycle, river flows, water quality and interactions with biosphere under future climate

Réservoir souterrain

Réservoir fleuve

100 m101 m

105 m

D

Rs

ESoil : •Choisnel vs. CWRR•Temperature, permafrost

River routing, wetlands, biogeochemical cycles

ET and climate interactions

2 sessions : « Hydrology » and « Energy budget and cold Processes »

ORCHIDEE-Dev : January 8th, 2013

Theme #1

Water cycle, river flows, water quality and interactions with biosphere under future climate

Session « Hydrology » :

•Aurélien Campoy : Coupled simulations with ORCHIDEE-CWRR

•Matthieu Guimberteau : The Amazon River Basin under change

•Marta Camino : Factors influencing DOC leaching from terrestrial ecosystems

•Anaïs Barella : Potential evaporation computation through an unstressed surface energy balance and its sensitivity to climate change effect

•Jan Polcher ?

LMDZOR avec la nouvelle hydrologie

Commit 1119: de nombreuses corrections apportées à ORCHIDEE pour pouvoir être couplé à LMDZ, avec tout les checks possibles.

1-Nouveau diagnostique de l’évaporation du sol nu.2-Humidités du sol hors bornes.3-Bug des petites fractions de PFT et frac_nobio4-Gestion des changements de végétation

96x95

Sensibilité du climat à l’hydrologie continentale

• Configuration des expériences:– ORCHIDEE couplé à LMDZ AR4 96x95x39– Sans STOMATE (Carte de végétation lue)– Températures océaniques imposées– Composition atmosphérique imposée

• 2 périodes étudiées sur des runs de 30 ans:– Présent (1998)– Futur (2070)

• 3 configurations d’ORCHIDEE:– BiCouche (qui a un drainage libre au fond)– Multicouche avec drainage libre au fond (11 couches)– Multicouche avec fond imperméable (101 couches)

- Global effect of irrigation and its impact on the onset of the Indian summer monsoon(Guimberteau & al., 2012, Clim. Dyn.)=> when irrigation is activated :- delayed monsoon onset + weakened monsoon- summer precipitation increase (decrease) over western (eastern) Mississippi

- A comprehensive approach to analyze discrepancies between land surface models and in-situ measurements: a case study over the US and Illinois with SECHIBA forced by NLDAS(Guimberteau & al., 2012, HESS)=> improvement of simulated soil moisture through sensitivity tests of vegetation parameters + use of a different evapotranspiration computation and precipitation input

- Discharge simulation in the sub-basins of the Amazon using ORCHIDEE forced by new datasets(Guimberteau & al., 2012, HESS)=> improvement of simulated discharges with new data sets of daily precipitation forcing & floodplains/swamps spatial coverage

- Future changes in precipitation and impacts on extreme streamflow over Amazonian sub-basins(Guimberteau & al., sub. to ERL)=> see next slide

Matthieu GUIMBERTEAUMatthieu GUIMBERTEAUPost-doc IPSL-SISYPHE-LSCEWork on ORCHIDEE: since 2006Main research topics: hydrology, water cycle, irrigation,streamflow, LSM assessment, Amazonian hydrologyMail: matthieu.guimberteau@upmc.frWeb page: http://www.sisyphe.upmc.fr/~guimberteau/

Past researchesPast researches Present research: Amazon River basinPresent research: Amazon River basin

- 2lay./11lay. hydrology comparison and assessment- Improvement of hydrology: soil & rooting depths, soil hydraulic properties - Soil water infiltration according to the offline precipitation spread over the time-step- Impact of LUC and Climate Change on hydrology

In the framework of the AMAZALERT project

Future changes in precipitation and impacts on extremeFuture changes in precipitation and impacts on extremestreamflow over Amazonian sub-basins (Guimberteau & al., sub. to ERL)streamflow over Amazonian sub-basins (Guimberteau & al., sub. to ERL)

Construction of future climate forcings (delta downscaling method): for each of the 8 AR4 GCMs=> 20yr-climatology for each variable => computation of anomalies between future and present-time=> addition of anomalies on each 6h NCC time-step (NCC previously corrected by daily precipitation

dataset) ORCHIDEE forced by 8 different future climate forcings => comparison with present-time simulation

Mean relative change (%) of the low flows for 16 stations(for each of the eight simulations, differences performed between each

future year and the present-time seasonality)

Result for 2046-2065 under SRESA1B scenario

Number of GCMs out of eight that project a JJA precipitation increase

Southern sub-basins (with low runoff coefficients (R/P)) will become more responsive to precipitation change than the western sub-basins (with high runoff coefficients)

Western and north-western sub-basins: more responsive to evaporation change

Factors influencing DOC leaching from terrestrial ecosystems

Main focus: to incorporate a module of dissolved organic carbon (DOC) leaching from terrestrial ecosystems into ORCHIDEE.

- Two phases:1) A database development in order to establish quantitative relationships between terrestrial DOC concentration and fluxes and their drivers (UA).2) Model development: improve process description to incorporate DOC leaching in ORCHIDEE(LSCE).

The observed relationships from the database will be used to parameterize in ORCHIDEE the spatial and temporal (intra and inter-annual) variability of DOC amongst ecosystems types.

Figure 1. Vertical pattern of DOC concentration in soil solution for broadleaved and coniferous forest sites.

Supervisors: Sebastiaan Luyssaert, Philippe Ciais (LSCE), Ivan Janssens (UA)

Marta Camino

SOIL MODULE IN ORCHIDEE

Factors influencing DOC leaching from terrestrial ecosystems

• Tasks to develop in ORCHIDEE:

1. Changes in code in ORCHIDEE: 1.1. Include DOC as a carbon pool (equations for decomposition, sorption/desorption) –Bertrand- 1.2. SWC and Drainage from 11 layers Hydrological Module (DOC concentration and fluxes) –Agnes, Matthieu, Aurélien- 1.3. Discretization of C and DOC in soil (together with tracers) -Camille-

2. Parameterization (literature/database results)

3. Validation (stream DOC fluxes)

Marta Camino