LMDZ-régional, jusqu’où iras-tu? (A few examples using LMDZ to study regional climate) (What can we expect from LMDZ for regional climate studies?) Laurent.

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LMDZ-régional, jusqu’où iras-tu? (A few examples using LMDZ to study regional climate) (What can we expect from LMDZ for regional climate studies?) Laurent Li Laboratoire de Météorologie Dynamique, IPSL/CNRS, Paris CLAVIER: a downscaling for eastern Europe (CLARIS: South America) SCAMPEI: a downscaling for France CIRCE: a downscaling for the Mediterranean Perspectives: A two-way nesting test in East China

The IPSL Earth System Model Carbon Cycle Chemistry Atmospheric Circulatio n Ocean Circulation Sea Ice Marine biochemistry Carbon DMS Nutriments Chemistry Gases & A e rosols CO2 Continental surface hydrology LMD Z Orchid é e LMD ZT ORCALIM INCA STOMATE Continental Biochemistry Carbon CH 4, COV, Aé rosols A é Marine salts ContinentsAtmosphereOceans Physics NEMO/OPA NEMO/TOP/PISCES

LMDZ-Med is a global atmospheric GCM with variable grid and a zoom over the Mediterranean basin. Local resolution: 30 km. It is run as a regional climate model, with nudging conditions (every 6 hours) from a global model (LMDZ-g, ERA40, IPCC, etc.) at low resolution outside the zoom. The model is free to have its own behaviours inside the zoom. LMDZ-regional: Med version

CLAVIER: a climate downscaling study for Eastern Europe -LMDZ -REMO5.0 -REMO5.7

LMDZREMOREMO2 Evolution of T2m and Prec in Eastern Europe

LMDZ-regional and REMO for climate change downscaling (ECHAM A1B) in Eastern Europe (2021/2050 – 1961/1990) LMDZ REMO5.7 REMO5.0 Surface air temperatureRainfall rate

LMDZ-regional climate change downscaling (3 different scenarios) in Eastern Europe (2021/2050 – 1961/1990) IPSL-A1B ECHAM-A1B ECHAM-B1 Surface air temperatureRainfall rate

Configuration of LMDZ-sudam: -irregular rectangular lat/lon grid -152x150 points in the domain -about 0.48° -very week relaxation inside ERAinterim: Global 0.75° 4xdaily. Reanalysis (1989/2008, 20 years) Scenario runs: Driven by IPSL-CM4 and ECHAM5 global models with the scenario A1B (1951/2100, 150 years).

A downscaling study for France: Three versions: Global / Europe / France Two-way nesting between Global/Europe One-way nesting from Europe to France

LMDZ Globe (300 km) LMDZ Europe (100 km) LMDZ France (20 km) LMDZ grid schemes for the whole earth (left), for Europe (middle) and for France (right) in three versions

Two-way nesting between LMDZ-regional and LMDZ-global

Global Regional Annual rainfall (mm/yr) Changes of annual-mean rainfall (mm/day) (2050 – 2000) global regionalRainfall averaged over France (mm/d)

Pr (mm/day), Tx(°C) et Tn (°C) for a return level at 50 years in Marseille, observation and 3 resolutions of LMDZ PrObs300km100km20km 1961/ /2050 ? TnObs300km100km20km 1961/ /2050 ? Pr: precipitation Tx: daily-maxi temperature Tn: daily-mini temperature TxObs300km100km20km 1961/ /2050 ?

CIRCE: Build a regional coupled model for the Mediterranean

Global Regional buffer zone Schematic of the quardruple coupling in IPSL: M4 Global O-A coupled model: LMDZ-global / ORCA2 Regional O-A coupled model: LMDZ-regional / MED8 Two atmospheric models are coupled through buffer zones Two oceanic models are also coupled through buffer zones

Zonal overturning stream function (Sv) for the whole Mediterranean Sea in IPSL-CM4, ERA40 and GR simulations respectively.

Time evolution of the annual-mean SST averaged for the whole Mediterranean Sea. Black curves are from regional coupled models, driven by ERA40, realized in CNRM, LMD, ENEA and MPI respectively.

Added values of high resolution and two-way nesting

Feedbacks from LMDZ-regional to LMDZ-global: vers une super- paramétrisation? Two-way nesting between LMDZ-regional and LMDZ-global 2way – 1way in LMDZ-global: 700-hPa height and wind

Added values of LMDZ-regional: extremes Spectral distribution of rainfall in southeast China, comparison between the observation, LMDZ/CTRL, LMDZ/CTRL2, and a few other coarse-resolution global models. Added values of high-resolution models can be clearly identified.