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Energy Balance at the Surface of the Ice Sheet in the Coastal Area of Adélie Land, Antarctica (Abstract only)

Published online by Cambridge University Press:  20 January 2017

P.-L Blaix
Affiliation:
Laboratoire de Glaciologie et Géophysique de I'Environnement, 2 rue Très-Cloîtres, 38031 Grenoble Cedex, France
D Delaunay
Affiliation:
Laboratoire de Glaciologie et Géophysique de I'Environnement, 2 rue Très-Cloîtres, 38031 Grenoble Cedex, France
A Poggi
Affiliation:
Laboratoire de Glaciologie et Géophysique de I'Environnement, 2 rue Très-Cloîtres, 38031 Grenoble Cedex, France
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Abstract

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Hourly measurements of wind, temperature, and humidity were made between elevations of 1 and 20 m in the coastal area of Adélie Land over a period of 45 d in January and February 1978. About 1000 profiles are available.

The height of the constant flux layer is >5 m despite the influence of katabatic winds, the wind profile is logarithmic with a mean standard deviation from the logarithmic law of 15 mm s−1. The potential temperature profile is also logarithmic with a mean standard deviation of 0.04°C. The most important deviation from the logarithmic law appears between -4 and 0°C.

Humidity was measured at two points only, between 1 and 20 m; the mean gradient was about 0.01 mbar m−1 and the flux of latent heat was generally negligible.

Net radiation was measured for only 10 d because of radiometer failure. All the fluxes are calculated using data for the 5 m layer. For the 10 d period, the heat loss was about 3 Wm−2 with a mean heat flux of -27.5 Wm−2 and mean net radiation of -10.5 Wm−2(the minus sign signifying the flux is towards the surface). In general, the heat flux is towards the surface (92% of the cases) but is away from the surface in the afternoon. The ablation during the 10 d period without snow-fall was about 200 mm of ice.

Type
Research Article
Copyright
Copyright © International Glaciological Society 1982