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February 2011
Message 63

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[Met-jobs] PhD opportunity at LATMOS/IPSL (France)

From delanoe julien <julien.delanoe@latmos.ipsl.fr>
To "met-jobs@lists.rdg.ac.uk" <met-jobs@lists.reading.ac.uk>
Date Mon, 21 Feb 2011 10:04:10 +0100

PhD opportunity at LATMOS/UVSQ/IPSL (France), 3 years contract, funded by CNES (French Spatial Agency)/NOVIMET on the “Combination of spatial active and passive measurements for cloud studies in the framework of the EarthCare mission preparation”

 

We are looking for an ingenious and highly motivated student. Applicant must have a Master degree or Engineer degree (or equivalent) in at least one of the following areas of expertise: Remote Sensing / Physics / Applied Mathematics / Environmental Sciences.

 

Language: English / French (not mandatory)

 

Application deadline: 31st of March 2011

 

Contact: Dr Julien Delanoë, julien.delanoe@latmos.ipsl.fr

 

Information:

·            Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS): http://www.latmos.ipsl.fr/index.php/en

·            CNES: http://www.cnes.fr/web/CNES-en/7114-home-cnes.php

·            NOVIMET: http://www.novimet.com/?lang=en

·            EarthCare: http://www.esa.int/esaLP/ASESMYNW9SC_LPearthcare_0.html

 

Description

 

Clouds are a major source of uncertainty in climate projections, they are still poorly represented in forecast models and contribute strongly to the earth radiative budget. All these difficulties are due to our lack of knowledge in the processes involved in the cloud life cycle and the mechanisms involved in phase transition from non-precipitating cloud to cloud producing precipitation at the ground. The large variety of cloud scales from the particle scale to the global scale, makes it even more complicated to represent clouds in models accurately. This complexity comes also from the fact that clouds are made of water and therefore can exist under different phases: liquid, solid (ice) and mixed when liquid water and ice coexist. The Earth radiative budget -since each phase has a different impact on the short and long-wave radiations - and the atmospheric dynamics are really influenced by the cloud phase. Recent spatial missions, like the A-Train, started bringing some answers to the question raised by clouds at global scale. Spatial radar and lidar are currently the unique way to vertically document cloud properties and when they are combined to radiometers allow us to study clouds in volume. A brand new European Space Agency mission, EarthCare, will insure the continuity to a part of the A-Train regarding the characterization of the cloud properties at global scale. EarthCare will include a Doppler Radar, a High Spectral Resolution Lidar, an infrared-visible radiometer and a Broad Band Radiometer on the same platform. This PhD work will aim to characterize the phase properties and the microphysical and radiative properties of cloud exploiting the synergy of active (Doppler Radar, High Spectral Resolution Lidar) and passive (visible and infrared radiometer) remote sensors in the framework of the preparation of the EarthCare mission. In order to prepare the future European mission, the successful candidate will use the A-Train data already available and the data collected during the airborne RALI campaigns (airborne radar-lidar-radiometer developed at the LATMOS). This work will integrate the EarthCare instrumental improvements compared to A-Train in the synergistic algorithm of the cloud parameters developed by our team. These retrievals from the A-Train will then be used to carry out some cloud properties statistics and analyse the mechanisms involved in the cloud life cycle. 

-- 
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Dr Julien Delanoë
LATMOS/IPSL/UVSQ
11 Boulevard D'Alembert
78280 Guyancourt
France
http://www.latmos.ipsl.fr
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