1. Institut Pierre-Simon Laplace (IPSL) Bringing together key laboratories of the Paris area in the field of environmental studies

2. IPSL = a federation of 6 laboratories in the Paris area LATMOS: atmospheric chemistry, mesoscale processes LISA: atmospheric chemistry, air quality LMD: atmospheric dynamics, climate studies LOCEAN: physical and biogeochemical studies of the ocean LPMAA: High altitude atmosphere LSCE: paleoclimatology, geochemical cycles, climate impacts in total about 1000 persons (permanent + temporary researchers; permanent + temporary support)

3. Key areas of the IPSL action Modeling studies Observational studies: in situ and from space Prepare the tools which are necessary for focused scientific studies: participation to the IPCC, field campaigns, planetary sciences

4. 19 vert. levels 30 vert. levels IPSL Climate Model Atmosphere and Continental surfaces (LMDZ - ORCHIDEE) Ocean and sea-ice (ORCA-LIM) coupler (OASIS) Résolution: Atm: 3.75°x2.5° (~350 km) Oce: 2°x2°

5. Participation to IPCC Simulations [GIEC 2007]

6. Earth System Model Physics Carbon Cycle Chemistry Atmospheric Circulatioèn Circulation Océanique Glace de mer Biogéochimieet biologie marine Carbon DMS Nutriments Chemistry Gases & Aérosols CO2 Continental surface sols et végétation LMD Z OrchidéeLMD ZT ORCALIM INCA STOMATE PISCES é Biochemistry Carbon CH 4, COV, Aérosols Aé Sels marins ContinentsAtmosphereOceans

8. Atmospheric CO 2 seasonal cycle : eg. Mauna Loa IPSL-CM4-LOOP GLODAP DIC Penetration in Atlantic Ocean

9. The chemistry-transport model CHIMERE (IPSL/LMD)‏ CHIMERE is a chemistry-transport model for the calculation of concentrations fields as: ozone, NOx, COVs, aerosols, dust... More than 100 users More than 20 institutes are using CHIMERE for daily forecast More than 35 institutes for research More than 50 papers in peer-reviewed journals Involved in numerous European projects such as GEMS, PROMOTE, City-Delta, Euro-Delta, CIRCE, AMMA, GEOMON, NATAIR. Used for analysis, forecast, pollution peaks and trends, direct or adjoijnt modelling, data assimilation. A communitary model in free access http://euler.lmd.polytechnique.fr/chimere Example of daily forecast experimental (at LMD): - France (GEMS)‏ - Africa, Atlantic and Europe: CHIMERE- DUST for minreal dust operational: PREVAIR french nationla plat-form (INERIS)‏ One of the forecast web sites Vertical cross-section of a dust event over Ukraine (March 2007) CHIMERE users in Europe

10. Objectives:  Bring together and provide access to remote sensing instruments; provide access to observations  Observe physical processes in the troposphere using instrument synergies: Long-term routine measurements Field campaigns  Provide experimental teaching and outreach Site d’observation: L’exemple du SIRTA Mid-latitudes: 48,7°N - 2,2°E Urban-rural region Sensitivities and trends in physical parameters Cloud radiative effect Cloud optical thickness Cloud and aerosol physical process studies Lidar backscatter Ground-Satellite Synergies Lidar Leosphere Lidar LMD Instrument development, comparisons, and qualification Applications: http://www.sirta.fr

11. Illustration des 6 satellites composant l'A-train. De gauche à droite : Aura, Parasol, Calipso, Cloudsat, Aqua, OCO. Crédits : CNES octobre 2004, illustration P. Carril

12. Observations satellitaires: exemple du bilan radiatif par ScaraB

13. Satellite measurements of CO2

14. Key issues Data distribution, outreach Combination of various tools for specific aims