News at GMGEC

april 2010

15 April 10- Seminar CNRM "Modelling the mechanisms responsible for sapropel S1 formation in the eastern Mediterranean" by Fanny Adloff - Max Planck Institute for Meteorology (Hamburg, Allemagne)

The presentation(display) will be made in French although the title and the summary is in English.

Title:Modelling the mechanisms responsible for sapropel S1 formation in the eastern Mediterranean

Summary:

During the early Holocene, the Mediterranean circulation has undergone considerable changes. These changes are reflected in the occurrence of organic-rich marine sediment (called sapropels) in the eastern Mediterranean, which indicate the oxygen depletion of the deep waters. The relative isolation of the basin together with a good coverage of available proxy data make this region an ideal testbed for modelling past climate changes. The work presented here is a first step towards elucidating the mechanisms responsible for the formation of the sapropels. We set up a regional version of the ocean general circulation model MPIOM for the Mediterranean. This model was forced with daily atmospheric data derived from equilibrium time slice simulations with the global coupled atmosphere-ocean-dynamical vegetation model ECHAM5/MPIOM/LPJ for 9000 years before present. As the forcing data set has a length of 100 years, interannual as well as decadal variability are contained in the model forcing. The model derived river-runoff and ocean hydrography were used as additional forcings, the latter used as boundary condition at the Atlantic margin of the regional ocean model. Starting from homogeneous water, the model has been integrated for several centuries until a quasi-steady-state was reached. For the early Holocene, the runoff from the Nile is increased in comparison with present-day conditions due to the enhanced African monsoon. The Bosphorus is assumed to be closed for this time period. The temperature seasonal cycle is amplified. The model simulates the Adriatic as the main source of deep water for the eastern Mediterranean. Convection in the northern Aegean is strongly enhanced. Deep water ventilation rates show a marked decadal variability due to variations in the forcing. The obtained well-ventilated steady-state for 9 ka BP serves as baseline state for several perturbation experiments, which aim at elucidating potential mechanisms leading to stagnant deep water in the eastern Mediterranean. The results from those perturbation experiments will be presented.

March 2010

18 March 2010

 News available Post-Docs starting in 2010 :

CIRCE Europeen project : pdf

SCAMPEI project : pdf

 Internal note:

Sanchez-Gomez E., Somot S. (2010) Study of the Mediterranean Sea Water and Heat budgets simulated by an ensemble of high resolution Regional Climate Models. Note de centre n°112. Groupe de Météorologie de Grande Echelle et Climat. CNRM. Janvier 2010. pdf

April 2009

24 April 2009: CNRM/GAME seminar: "The climate models are not perfects : Let’s benefits from it ! or : "About interest of nudging at grid points to understand GCM’s errors and the climate variability " given by Hervé Douville (et S. Bielli, M. Déqué, B. Pohl, D. Saint Martin) - GMGEC/UDC, 2009, May 25 14:30 in Navier conference room – second floor.

March 2009

20 March 2009: A The 3rd HyMeX Workshop will take place from 2 to 4 June 2009 at HCMR (Hellenic Centre for Marine Research) in Heraklion (Gouves), Crete-Greece. Side-meetings of the HyMeX Working Groups will be organized at the same place the 1st June. Informations and registration on :

February 2009

6 February 2009: A workshop of the European project ENSEMBLES is organized in Toulouse (9th-10th February 2009) by CNRM / GMGEC Topic: regional modelling of the climate change in Europe and in Africa .

September 2008

16 September 2008 :Documentation of new version 5.1 of Arpege-Climat is available on the site here

5 September 2008 : Welcome to incomers at GMGEC: Gilles Bellon, Bertrand Decharme, Anne-Sophie Daloz, Marine Herrmann, Martine Le Moigne, Renaud Lestringant, Benjamin Pohl, Aurélien Ribes

April 2008

29 April 08 - News available Post-Docs starting in 2008 :

4 April 08 - Available PhD thesis starting in 2008 :

November 2007

17 November 07 - Climate Change 2007”, the IPCC Fourth Assessment Report (AR4), is about to be completed. Earlier this year, the three IPCC Working Groups contributions to the AR4 were released. On the 17 of November, the last part of the AR4 will be launched: “The Synthesis Report”. (pdf )

October 2007

12 October 07 - The UN’s Intergovernmental Panel on Climate Change (IPCC) and former US Vice President Al Gore were awarded the Nobel Peace Prize

September 2007

13 September 07- For the first time, a climate change scenario has been completed for Europe and the Mediterranean basin with a high-resolution Atmosphere-Ocean Regional Climate Model (Somot, Sevault, Déqué, Crépon, 2007, accepted in Global and Planetary Change) -pdf

August 2007

9 August 07 - The french MEDUP project (Forecast and projection in climate scenario of Mediterranean intense events: Uncertainties and Propagation on environment) has been recently accepted by the french national research agency (ANR). This 3-year project is leaded by V. Ducrocq (CNRM) and involves 3 research groups of the CNRM included GMGEC.

June 2007

12 June 07- New page at GMGEC site on "Climate" seminar CNRM

May 2007

16 May 07- Seminar CNRM « Assessment report of IPCC :working Group II du GIEC » by Eric Martin CNRM/GMME/MC2

10 May 07 - Review on the impacts of climate change on the water cycle (in french) by Douville H. , André J. C., de Marsily G. , 2007, Annales des Mines "Responsability and Environment" ,July edition 2007 , Global warming and greenhouse gases .

9 May 07 - PhD. viva of Anne-Laure Gibelin - GMGEC / UDC :The carbon cycle in a land surface model : Modelling, validation and implementation at a global scale.

ISBA-A-gs is an option of the CNRM land surface model ISBA which allows for the simulation of carbon exchanges between the terrestrial biosphere and the atmosphere. The model was implemented for the first time at the global scale as a stand-alone model. Several global simulations were performed to assess the sensitivity of the turbulent fluxes and Leaf Area Index to a doubling of the CO2 atmospheric concentration, and to the climate change simulated by the end of the 21st century. In addition, a new option of ISBA, referred to as ISBA-CC, was developed in order to simulate a more detailed ecosystem respiration by separating the autotrophic respiration and the heterotrophic respiration.

The vegetation dynamics and the carbon fluxes were validated at a global scale using satellite datasets, and at a local scale using data from 26 sites of the FLUXNET network. All of these results show that the model is sufficiently realistic to be coupled with a general circulation model, in order to account for interactions between the terrestrial biosphere, the atmosphere and the carbon cycle.

4 May 07 - FOURTH ASSESSMENT REPORT OF WGIII IPCC ( MITIGATION) On 4 May 2007 the Summary for Policy Makers of the third volume of the Fourth Assessment Report of IPCC has been approved in Bangkok, Thailand. This volume deals with the mitigation of climate change.

It analyses mitigation options for the main economic sectors in the near-term. It provides information on long-term mitigation strategies for various stabilization levels, paying special attention to implications of different short-term strategies for achieving long-term goals. It also addresses the relationship between mitigation and sustainable development.

April 2007

2 - 5 April 07 - Session of IPCC Working group II , Brussels.Working group final draft contribution for policymakers is available in english or other languages at - ( pdf in english)

March/April 07 - Contributions in special edition of Sciences & Avenir (n°150) about Climate Change : J.-F. Royer et H. Douville, 2007 : Climating forcing - natural or human causes, pp 73-76 , M. Déqué et S. Somot pp 6 et 7, F.Chauvin pp 44 et D. Salas y Mélia pp 68.

March 2007

29 march 07 - Presentation by Serge Planton at CIC Scientific Basic of climate change .On the 2nd of February , the IPCC (Intergovernmental Panel on Climate Change) published the fourth Assessment Report (AR4) on the science of climate change.

4 march 07 - Report on the climate change scenarios simulated by the two french coupled models from IPSL & Meteo-France: Livre Blanc Escrime (pdf)

February 2007

8 feb 07 - Article published in La Météorologie - Simulation of the 21 St century and futur climates by the two french models from CNRM and IPSL: J-L Dufresne, D. Salas y Mélia, S. Denvil, S. Tyteca, O. Arzel, S. Bony, P. Braconnot, P. Brockmann, P. Cadule, A. Caubel, F. Chauvin, M. Déqué, H. Douville, L. Fairhead, T. Fichefet, M-A Foujols, P. Friedlingstein, J.-FGueremy, F. Hourdin, A. Idelkadi, C. Levy, G. Madec, P. Marquet, O. Marti, I. Musat, S. Planton, J.-F. Royer, D. Swingedow, A. Voldoire. La Météorologie, No. 55, pp. 45-59, 2006.

2 feb 07 - IPCC 4th assessment report: summary for policymakers-(pdf)

January 2007

24 jan 07 - Climate Change 2007 : the IPCC 4th assessment report is coming out in Paris. A comprehensive and rigorous picture of the global present state of knowledge of climate change (2500 scientific expert reviewers, 800 contributing authors and 450 lead authors from 130 countries, 6 years work, 4 volumes, 1 report)

12 jan 07 - Launch of the website