Summary of the 2-days ORCHIDEE meeting (13 and 14 of May 2013)

A 2 days meeting was organized in Jussieu to gather all developpers and users of ORCHIDEE to discuss about the futur of the model developments concerning primarily the "Physic" of the modele. Few external contributors also came to provide an independant view of ongoing developments in other groups.

The meeting successfully gathered around 70 peopled.. Below is the agenda with a link to the different presentations and few words about the "round table discussions"

Monday 14 morning session: overview of ORCHIDEE

Welcome (P. Peylin) (​presentation)

An historical view of the land surface model at IPSL – (K. Laval) (​presentation)

The ORCHIDEE project: Status & Ongoing developments (P. Peylin) (​presentation)

Land use change in ORCHIDEE (N. De Noblet) (​presentation)

Link between Physical & Biogeochemical processes (S. Luyssaert) (​presentation)

The High Latitude developments. (I. Gouttevin) (​presentation)

Monday 14 Afternoon Session: Hydrology

Hydrology in ORCHIDEE - Past achievements and perspectives (A. Ducharne) (​presentation)

"Hydrological data assimilation in LSMs - The experience of the ECMWF" (P. deRosnay, ECMWF) (​presentation)

Hydrology in CNRM-CM climate model: development of a simple aquifer scheme (J.P. Vergne, CNRM) (​presentation)

Modeling ground water of French river basin (F. Habets) (​presentation)

Water uses evolution and ground-water reservoirs: operating rule with ODDYCCEIA: links with ORCHIDEE & perspectives (P. Dumas) (​presentation)

Accounting for human impact on hydrology in ORCHIDEE (M. Guimberteau) (​presentation)

Round table: The future of hydrology in ORCHIDEE: which ways? which collaborations ? We had a short discussion on how to improve the ORCHIDEE model which lead to the following remarks:

-- ssss -- ssss

Tuesday 14 Morning Session: Coupling with the atmosphere

ORCHIDEE-LMDZ coupling; lesson from CMIP5 (F. Cheruy) (​presentation)

Future LMDZ development: the new PBL (F. Hourdin) (​presentation)

The use of isotopes to diagnose surface processes (C. Risi)(​presentation)

A new radiative Transfert scheme in ORCHIDEE (J. Otto) (​presentation)

A new multi-layers energy budget in ORCHIDEE (J. Ryder) (​presentation)

ORCHIDEE-WRF: the potential of the OASIS coupler (J. Polcher) (​presentation)

Round tables: The future challenge for ORC – LMDz coupling (F. Cheruy)

Tuesday 14 Afternoon Session

ORCHIDEE in the Model Inter-comparison Projects (P. Ciais) (​presentation)

Session on Evaluation (chair: N. Vuichard)

Presentation of the on-going effort towards a systematic evaluation chain (N. Vuichard)

• See his presentation ​here

YOUR Contributions

• Jan Polcher / Agnès Ducharne : ​Hydrology
• Catherine Ottlé: ​Snow
• Sarah Dantec-Nédélec: ​High Latitudes
• Camille Risi / Francesca Guglielmo : ​Isotopes
• Fabienne Maignan: ​Vegetation Index
• Ben Poulter: ​Biomass
• Philippe Peylin : ​CO2 at stations
• Frédérique Chéruy : ​LMDZ-ORCHIDEE

Poster session with Coffee (F. Maignan)

• Presentation of all posters (1 slide / poster )
• Discussion & drink around the posters

ORCHIDEE code structure and its future evolution (F. Maignan & S. Luyssaert)

• Current code structure and potential evolution (F. Maignan & S. Luyssaert)
• Coding practicies from current developers (M. Mcgrath)
• The constraint for automatic code differentiation (M. Mancip)
• Round table: How to improve the ORCHIDEE code structure?