EAS Publications Series
Volume 14, 2005Dome C Astronomy and Astrophysics Meeting
|Page(s)||227 - 232|
|Published online||05 January 2006|
M. Giard, F. Casoli and F. Paletou (eds)
EAS Publications Series, 14 (2005) 227-232
Site testing study based on weather balloons measurements
LUAN, Université de Nice, Parc Valrose, 06108 Nice Cedex 2, France
2 School of Physics,University of New South Wales, Sydney, NSW 2052, Australia
3 Department of Geography, University of Idaho, Moscow, Idaho, USA
Corresponding author: email@example.com
We present wind and temperature profiles at Dome C measured during the polar summer by balloon born sonds. Data from 197 flights have been processed for 4 campaigns between 2000 and 2004. We show the exceptionnal wind conditions at Dome C: averaged ground wind speed is 3.6 m s-1. We noticed in mid-november the presence of high altitude strong winds (40 m s-1) probably due to the polar vortex which disappear in summer. These winds seem to have no effect on seeing measurements made with a DIMM at the same period. Temperature profiles exhibit a minimum at height 5500 m (over the snow surface) that defines the tropopause. Surface layer temperature profile has negative gradient in the first 50 m above ground in the afternoon and a strong inversion layer (5°C over 50 m) around midnight. Wind profiles are compared with other astronomical sites, and with a meteorological model from Meteo France.
© EAS, EDP Sciences, 2005
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