Time filter

Source Type

Gallee H.,CNRS UJF Andndash | Barral H.,CNRS UJF Andndash | Vignon E.,CNRS UJF Andndash | Genthon C.,CNRS UJF Andndash
Atmospheric Chemistry and Physics | Year: 2015

A case study of a low-level jet (LLJ) during the OPALE (Oxidant Production over Antarctic Land and its Export) summer campaign is presented. It has been observed at Dome C (East Antarctica) and is simulated accurately by the three-dimensional version of the Modèle Atmosphérique Régional (MAR). It is found that this low-level jet is not related to an episode of thermal wind, suggesting that Dome C may be a place where turbulence on flat terrain can be studied. © Author(s) 2015. CC Attribution 3.0 License. Source

Gallee H.,CNRS UJF Andndash | Preunkert S.,CNRS UJF Andndash | Argentini S.,Dell | Frey M.M.,Natural Environment Research Council | And 8 more authors.
Atmospheric Chemistry and Physics | Year: 2015

Regional climate model MAR (Modèle Atmosphérique Régional) was run for the region of Dome C located on the East Antarctic plateau, during Antarctic summer 2011-2012, in order to refine our understanding of meteorological conditions during the OPALE tropospheric chemistry campaign. A very high vertical resolution is set up in the lower troposphere, with a grid spacing of roughly 2 m. Model output is compared with temperatures and winds observed near the surface and from a 45 m high tower as well as sodar and radiation data. MAR is generally in very good agreement with the observations, but sometimes underestimates cloud formation, leading to an underestimation of the simulated downward long-wave radiation. Absorbed short-wave radiation may also be slightly overestimated due to an underestimation of the snow albedo, and this influences the surface energy budget and atmospheric turbulence. Nevertheless, the model provides sufficiently reliable information about surface turbulent fluxes, vertical profiles of vertical diffusion coefficients and boundary layer height when discussing the representativeness of chemical measurements made nearby the ground surface during field campaigns conducted at Concordia station located at Dome C (3233 m above sea level). © Author(s) 2015. Source

Discover hidden collaborations