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September 2013
Message 22

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[Met-jobs] Post doc Position at CERFACS (Toulouse/France): Numerical simulation and parameterization of chemical reactions in the aircraft wakes

From thouron <thouron@cerfacs.fr>
To met-jobs@lists.reading.ac.uk
Date Fri, 06 Sep 2013 15:22:41 +0200

Position details

Numerical simulation and parameterization of chemical reactions in the aircraft wakes

Required Education

PhD

From

October 2013

Duration

1 year renewable

Context

This work is part of project TC2 (Condensation Trails and Climate http://www.cerfacs.fr/TC2) whose main objective is to better understand and quantify the impact of aircraft emissions on the environment.
In this context, the prediction of the dispersion and mixing of aircraft emissions and the atmosphere is a critical aspect to understand how the small scale processes, that took place in the wake of the plane, influence the physics and chemistry of the atmosphere on a global scale. Indeed, current general circulation models make the assumption that emissions are instantaneously diluted over large meshes (a few hundred kilometers), and therefore can not represent the heterogeneity and the physicochemical transformations occurring in the wake of the aircraft.
A method called "Effective Reaction Rates" has recently been developed at CERFACS (Cariolle et al., 2009 Paoli et al., 2011) to incorporate these effects into global models. The method is based on a decomposition of the concentrations of each species in a "background" contribution (corresponding to the part resolved by global models) and a "plume" contribution (corresponding to the part which is not diluted to background level). The key point is to develop chemical parameterizations for this last part (using data obtained from smaller scale simulations) in order to take into account the plume contribution into global models.

Description

For this purpose it is necessary to simulate the evolution of the atmospheric chemical composition and  the changes in emissions during the plume dispersion. The simulations will be carried out with Meso-NH (a research meteorological model supplemented with detailed chemical kinetic scheme) that solves all the processes explicitly.
For this purpose, the candidate will have to (i) include in the Meso-NH the homogeneous chemical reactions in the gas phase and the heterogeneous chemical processes at the surface of particles and ice crystals; (ii) perform LES (Large Eddy Simulations) of the wake dispersion and chemical reactions;, (iii) analyze the chemical database obtained with the simulations; and (iv) use these data to build-up the chemical parameterization according to the methodology mentioned above.
The post-doctoral offer excellent opportunities to publish results in peer-reviewed international journals.
It is necessary to have a good experience in advanced numerical simulation and a good level of technical/scientific English. Experience in atmospheric chemistry and / or LES would be an asset.  

D. Cariolle, D. Caro, R. Paoli, D. Hauglustaine, B. Cuenot, A. Cozic, and R. Paugam. Introduction of non-linear plume chemistry into large-scale atmospheric models: application to aircraft émissions. Journal of Geophysical Research, Vol. 114, D19302, 2009.
R. Paoli, D. Cariolle, and R. Sausen. Review of effective emissions modeling and computation, Geoscientific Model Development, Vol.4, pp. 643-667, 2011.

Contacts

Name: Cariolle Daniel
Phone: 05.61.19.31.71
Fax:
Email: cariolle@cerfacs.fr

Salary

around 2350 euros net



-- Odile Thouron CERFACS/A&E 42 avenue Gaspard Coriolis 31057 Toulouse Cedex 01 Tel : (33).(0)5.61.19.30.52 Fax : (33).(0)5.61.19.30.00 http://www.cerfacs.fr


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