Validation of a limited area model over Dome C, Antarctic Plateau, during winter |
| |
Authors: | Hubert Gallée Irina V Gorodetskaya |
| |
Institution: | 1. Laboratoire de Glaciologie et de Géophysique de l’Environnement, CNRS, 54, rue Molière, BP. 96, 38402, St Martin d’Hères Cedex, France
|
| |
Abstract: | The limited area model MAR (Modèle Atmosphérique Régional) is validated over the Antarctic Plateau for the period 2004–2006,
focussing on Dome C during the cold season. MAR simulations are made by initializing the model once and by forcing it through
its lateral and top boundaries by the ECMWF operational analyses. Model outputs compare favourably with observations from
automatic weather station (AWS), radiometers and atmospheric soundings. MAR is able to simulate the succession of cold and
warm events which occur at Dome C during winter. Larger longwave downwelling fluxes (LWD) are responsible for higher surface
air temperatures and weaker surface inversions during winter. Warm events are better simulated when the small Antarctic precipitating
snow particles are taken into account in radiative transfer computations. MAR stratosphere cools during the cold season, with
the coldest temperatures occurring in conjunction with warm events at the surface. The decrease of saturation specific humidity
associated with these coldest temperatures is responsible for the formation of polar stratospheric clouds (PSCs) especially
in August-September. PSCs then contribute to the surface warming by increasing the surface downwelling longwave flux. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|