surface mass balance; surface energy balance; Antarctica
Abstract :
[en] Meteorological data recorded from 12 December 2008 to 30 June 2010 were analyzed to assess the surface energy balance (SEB) in a blue ice area of Cap Prudhomme, Adelie Land (66 degrees 41'S, 139 degrees 55'E). The SEB was computed with a newly developed model forced by direct measurements and with a voluntarily limited number of parameters to better assess model sensitivity. Incoming short-wave radiation was corrected for the slope and orientation of the local terrain assuming direct and diffuse radiation components. Turbulent heat fluxes were assessed using the bulk aerodynamic approach. Heat conduction in the ice was computed by solving the thermal diffusion equation. Snow accumulation was modeled using ERA interim total precipitation and a one-dimensional erosion model. The surface heat budget and accumulation/erosion model accurately reproduced field observations. The occurrence of blue ice is linked with higher rates of erosion than in the surrounding snow covered areas, which may be caused by local flow divergence or snow not being redistributed from higher elevations. Melting occurs between December and February when incoming short-wave radiation is high. However, the SEB was closely linked to air temperature through the incoming long-wave radiation and the turbulent sensible heat flux. Several warm events caused by cyclones intruding into the continent led to significant warming of the ice and high melting rates. Intruding cyclones were also associated with high precipitation that led to significant accumulation. Except in blue ice areas, modeling suggests that expected higher precipitation in a warmer climate will result in more accumulation.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Favier, Vincent; UJF–Grenoble 1 / CNRS, Laboratoire de Glaciologie et Géophysique de l’Environnement (LGGE) UMR 5183, 38041 Grenoble, France
Agosta, Cécile ; UJF–Grenoble 1 / CNRS, Laboratoire de Glaciologie et Géophysique de l’Environnement (LGGE) UMR 5183, 38041 Grenoble, France
Genthon, Christophe; UJF–Grenoble 1 / CNRS, Laboratoire de Glaciologie et Géophysique de l’Environnement (LGGE) UMR 5183, 38041 Grenoble, France
Arnaud, Laurent; UJF–Grenoble 1 / CNRS, Laboratoire de Glaciologie et Géophysique de l’Environnement (LGGE) UMR 5183, 38041 Grenoble, France
Trouvillez, Alexandre; Cemagref, UR ETNA, Saint Martin d’Hères, France
Gallée, Hubert; UJF–Grenoble 1 / CNRS, Laboratoire de Glaciologie et Géophysique de l’Environnement (LGGE) UMR 5183, 38041 Grenoble, France
Language :
English
Title :
Modeling the mass and surface heat budgets in a coastal blue ice area of Adelie Land, Antarctica
Publication date :
2011
Journal title :
Journal of Geophysical Research. Earth Surface
ISSN :
2169-9003
eISSN :
2169-9011
Publisher :
Wiley
Volume :
116
Pages :
-
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 226375 - ICE2SEA - Ice2sea - estimating the future contribution of continental ice to sea-level rise
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