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February 2011
Message 67

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[Met-jobs] PhD student wanted at Meteo France/CNRM

From Laurent Gomes <laurent.gomes@meteo.fr>
To met-jobs@lists.reading.ac.uk
Date Mon, 21 Feb 2011 11:17:25 +0100

PhD Position at Météo france, Centre National de Recherches Météorologiques

Modeling of marine aerosols and their direct radiative impact on the Mediterranean

The Mediterranean basin is subject to multiple influences that lead to high concentrations of aerosols of different origins (desert dust, anthropic pollution, biomass burning and sea salt) having a significant influence on the radiative balance of the Earth-atmosphere system. The MesoNH mesoscale model simulates the main types of particles with the exception of sea salts. The presence of these different types of aerosols result in a decrease of solar radiation at sea surface and possibly alter the heating rate of the layers in which they are located. Currently, impacts of changes in radiative forcing of aerosols on atmospheric dynamics and the water cycle in the Mediterranean basin are still poorly estimated.

In this context, the primary purpose of this thesis will be to develop a numerical scheme for the generation of marine aerosols to simulate their physicochemical properties (concentration and size distribution). In a second step, the objective is to couple this generation scheme to a "chemistry-optical" module recently developed at CNRM (Meteo France) for MesoNH to simulate the optical properties of marine aerosols and in particular the visibility (solar & IR) over the basin, for well-defined episodes (case of Mistral or Tramontana winds). Finally, the ultimate objective will be to couple the optical properties simulated with the MesoNH radiation code (solar and infrared) in order to study the direct aerosol radiative impact on the Mediterranean sea.

Developments and numerical simulations will be evaluated using in situ ground and airborne measurements to be implemented under the international programs CHARMEX (http://charmex.lsce.ipsl.fr) and HYMEX (http://www.hymex.org). These observations cover the current meteorological parameters (pressure, temperature, humidity, wind speed, visibility, clouds ...) but also more specific parameters for the calculations of radiative transfer in the optical (visible and infrared radiation fluxes) and physico-chemical domains of the atmosphere: nature, optical properties and size distribution of different types of aerosols. In parallel, modeling exercises will also be assessed using the restitutions by remote sensing (lidar, photometer) of microphysical/ optical properties of aerosols derived from ground measurements (PHOTON / AERONET) and satellite (CALIOP / PARASOL / IMO) on the Mediterranean basin.

Qualifications:
The PhD position is for 3 years and requires a M. Sc. (or equivalent) in chemistry, physics, or a related discipline. Interest in atmospheric and physical chemistry, programming/technical and organizational skills, and the willingness to communicate research results and to interact within an international research environment are basics. To carry out this work, the candidate will benefit from the complementary areas of expertise of the teams supervising this thesis, on one hand regarding ground and airborne measurements and remote sensing and on the other hand for mesoscale modeling. Why he (she) should be familiar with the research model Meso-NH and with protocols for analyzing thermodynamical and microphysical data sets.

Applications and questions related to the position should be urgently sent to:
Pierre Tulet, pierre.tulet@meteo.fr
Laurent gomes, laurent.gomes@meteo.fr
or Marc Mallet,. Marc.mallet@aero.obs-mip.fr
We are looking forward to receiving your application by e-mail until March 10, 2011. Applications are expected to include a vitae (including education, professional experience, and publications) and letters of reference.

--
Laurent GOMES
CNRS
Metéo-France/CNRM/GMEI/MNPCA
42, avenue G. Coriolis
31057 Toulouse Cedex 01






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