met-jobs@lists.reading.ac.uk
July 2020
Message 95

[Periods|Index by:DateThreadSubjectAuthor|Date:PreviousNext|Thread:(Previous)(Next)|List Information]

[Met-jobs] PhD position "On the role of atmospheric boundary layer and moutain waves on climate and infrasound waves" at Ecole Normale Supérieure, Paris (France).

From MILLET Christophe <christophe.millet@cea.fr>
To <met-jobs@lists.reading.ac.uk>
Date Wed, 29 Jul 2020 19:07:29 +0200

Dear Colleagues,

The Laboratoire de Météorologie Dynamique, ENS Paris (https://www.ens.psl.eu/en) invites applications for one PhD position on the project "Impact of atmospheric boundary layer (ABL) and mountain waves on climate and on infrasound waves".

The impact of mountains on atmospheric circulation and climate is studied by two relatively distinct communities. The first community studied how mountains modify the turbulent ABL, which is a central problem in the context of wind energy and wind turbine-generated infrasound. The second community was more interested in mountain meteorology itself, trying to describe the triggering of downslope windstorms and the appearance of gravity waves (GWs). In climate models, these different effects are parameterized in different modules, but as the models have increasingly fine grids, these approaches should be brought together and we should study again and with more details the interactions between the ABL and mountain waves. The objectives of the project are (i) to extend recent theoretical studies on the interactions between mountain waves and boundary layer (Damiens et al., 2017, Soufflet et al., 2019, Lott et al., 2020) in order to establish in which horizontal scale domains one approach is better than another, (2) introduce more elaborated turbulent closures (mixing length and k-epsilon type) into the wave theory so as to estimate the production of turbulent energy by mountain waves and (3) analyze theoretically the thickness over which the subgrid scale mountains affect the large-scale flow in the lower layers. A preliminary result indicates that the smallest scales can induce an upward displacement of the boundary layer without considerably decelerating the flow in the lower layers. Further, we will analyze in the LMDz GCM, how these different effects can be parameterized and how they impact the large-scale circulation of the atmosphere (stationary planetary wave, synoptic depressions, blockings, meridional circulations) and infrasound propagation at a global scale.

The PhD position is funded by the CEA (http://www.cea.fr/english) and is a collaboration between the LMD and CEA. The researcher will also work closely with the model development teams of IPSL (Gastineau et al., 2020) and ECMWF (Kanemaha et al., 2019).

Applications including CV and a letter of motivation must be submitted by 28 August 2020 to François Lott (flott@lmd.ens.fr) and Christophe Millet (cmillet@lmd.ens.fr).

Sincerely,


--
Christophe Millet

Alternative Energies & Atomic Energy Commission - CEA & Borelli Center, Ecole Normale Superieure Paris-Saclay




Go to: Periods · List Information · Index by: Date (or Reverse Date), Thread, Subject or Author.