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October 2012
Message 80

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[Met-jobs] 2 years post doctoral position at IPSL atmosphere-continental surface coupling

From Cheruy Frederique <Frederique.Cheruy@lmd.jussieu.fr>
To met-jobs@lists.reading.ac.uk
Date Wed, 24 Oct 2012 14:13:43 +0200

2 years EMBRACE post doctoral position: Implementation/evaluation of a physically based soil water flow representation for modelling large scale land surface hydrological processes in the IPSL climate model, LMDZOR.

The interest of the climate projections depends highly on the quality of the modeling tools used. This is the reason why modeling groups devote long term efforts for their improvement in an iterative approach coupling implementation/evaluation and development. Based on a decade of research on cloud processes, a new version of the LMDZ atmospheric general circulation model has been developed that corresponds to a complete recasting of the parametrization of turbulence, convection and clouds. With the more tested LMDZ5A, atmospheric physical package, this new version, named LMDZ5B, has been used for the realization of climate change projections with the IPSL climate model (IPSL-CM) for the CMIP5 exercise

A new hydrological scheme referring to a physically based soil water flow representation following the Richard diffusion equation is being implemented in the IPSL-CM in order to substitute the 2 layers Choisnel scheme in the ORCHIDEE land surface model, coupled to LMDZ. The scope is to improve the representation of the interactions with the continental surface, whose impact on the regional and global climate is clearly demonstrated (Koster et al. 2004) and. eventually improve on the reliability of the detection/attribution of extreme events such as summer droughts or heat waves. The preliminary tests done with simplified configurations show a clear impact on bias common to numerous climate models (e.g. warm biais at mid-latitude in summer) as well as on the realism of the near surface meteorology. (cheruy et al. 2012)

The purposes of this EMBRACE (http://www.smhi.se/embrace) FP-7 funded contract are threefold:


  • in depth evaluation of the hydrological module coupled with the STOMATE dynamical vegetation module and the LMDZ GCM, at various spatial scales from local to continental,

  • improve on the defects shown by the preliminary evaluation, particularly working on spacialization of key parameters such as hydrodynamical properties of soils, soil depths, root profiles, links between ground water and routing. The coupling with a. description of the root growth will be eventually addressed in collaboration with the experts of carbon cycle in the ORCHIDEE model.

  • contribute to the analysis of the soil moisture/climate feedbacks in the framework of the GLACE-CMIP5 experiment (e.g. Seneviratne et al. 2012) and to the characterization of summer droughts in the present and the future climates (e.g. Bertrand et al. 2012)

The successful applicant will hold a PhD or equivalent qualification in a relevant field, a research track record in one or more of the following areas: atmospheric modeling, coupled climate modeling, land surface modeling. Applicants should also be able to demonstrate programming skills in a Unix/Linux environment (e.g. Fortran 9X, shell scripts, R) as well as possessing excellent written and oral communication skills.

Help in the writing of reports for the EMBRACE is part of the job.

Location

LMD/CNRS -Paris- (http://www.lmd.jussieu.fr) involved in the L-IPSL project: LabEx (laboratoire of excellence) Institut Pierre Simon Laplace (IPSL):  Comprendre le climat et anticiper les changements futurs .

supervisory staff:Frédérique Cheruy (LMD), Agnès Ducharne (Sisyphe), Philippe Peylin (LBI), Jan Polcher (LMD)

Interested applicants should send a detailed CV and the contact information of at least two referees to cheruy@lmd.jussieu.fr review of applications will begin immediately and continue until the position is filled.

References:


Chéruy F, Campoy A,  Dupont J-C, Ducharne A, Hourdin F, Haeffelin M, Chiriaco M, Idelkadi A (2012). Combined influence of atmospheric physics and soil hydrology on the simulated meteorology at the SIRTA atmospheric observatory. Climate Dynamics, in press

Seneviratne S., M. Wilhelm, T. Stanelle, B. van den Hurk , S. Hagemann, A. Berg, F. Cheruy, M. E. Higgins, A. Meier, V. Brovkin, M. Claussen, J-L Dufresne, K. Findell, D M. Lawrence, S. Malyshev, and Ben Smith: Impact of soil moisture-climate feedbacks on CMIP5 projections: First results from

the GLACE-CMIP5 experiment (submitted GRL, Juillet 2012).

Koster, R. D., et al. (2004), Regions of strong coupling between soil moisture and precipitation, Science, 305, 1138–1140.




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