lmdz-régional, jusqu’où iras-tu? (a few examples using lmdz to study regional climate) (what can...
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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
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The IPSL Earth System Model
Carbon
Cycle
Chemistry
Atmospheric Circulation
Ocean Circulation Sea Ice
Marine biochemistry
Carbon
DMS
Nutriments
Chemistry
Gases
&
Aerosols
CO2
Continental surface
hydrology
LMDZ
Orchidée LMDZT
ORCALIM
INCA
STOMATE
ContinentalBiochemistry
Carbon
CH4, COV,
Aérosols
Aérosols Marine salts
Continents Atmosphere Oceans
Physics
NEMO/OPA
NEMO/TOP/PISCES
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• 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
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CLAVIER: a climate downscaling study for Eastern Europe-LMDZ-REMO5.0-REMO5.7
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LMDZ REMO REMO2
Evolution of T2m and Prec in Eastern Europe
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LMDZ-regional and REMO for climate change downscaling (ECHAM A1B) in Eastern Europe (2021/2050 – 1961/1990)
LMDZ
REMO5.7
REMO5.0
Surface air temperature
Rainfall rate
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LMDZ-regional climate change downscaling (3 different scenarios) in Eastern Europe (2021/2050 – 1961/1990)
IPSL-A1B
ECHAM-A1B
ECHAM-B1
Surface air temperature
Rainfall rate
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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).
http://www.lmd.jussieu.fr/~li/claris
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A downscaling study for France:
•Three versions: Global / Europe / France
•Two-way nesting between Global/Europe
•One-way nesting from Europe to France
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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
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Two-way nesting between LMDZ-regional and LMDZ-global
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Global Regional
Annualrainfall(mm/yr)
Changes ofannual-meanrainfall (mm/day)(2050 – 2000)
global
regional Rainfall averagedover France (mm/d)
1951 2050
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Pr (mm/day), Tx(°C) et Tn (°C) for a return level at 50 years in Marseille, observation and 3 resolutions of LMDZ
Pr Obs 300km 100km 20km
1961/1990 145 43 42 62
2021/2050 ? 38 56 93
Tn Obs 300km 100km 20km
1961/1990 26.2 21.7 24.8 25.6
2021/2050 ? 24.0 27.0 27.8
Pr: precipitation
Tx: daily-maxi temperature
Tn: daily-mini temperature
Tx Obs 300km 100km 20km
1961/1990 38.9 32.2 34.7 35.6
2021/2050 ? 36.0 36.9 37.5
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CIRCE: Build a regional coupled model for the Mediterranean
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Global
Regional
buffer zone
buffer zone
Schematic of the quardruple coupling in IPSL: M4
Global O-A coupled model: LMDZ-global / ORCA2Regional O-A coupled model: LMDZ-regional / MED8
Two atmospheric models are coupled through buffer zonesTwo oceanic models are also coupled through buffer zones
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Zonal overturning stream function (Sv) for the whole Mediterranean Sea in IPSL-CM4, ERA40 and GR simulations respectively.
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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.
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Added values of high resolution and two-way nesting
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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
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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.