HR: 0800h
AN: C21A-1067    [Abstracts]
TI: Snow-Atmosphere Interaction in the Swiss Alps
AU: * Huwald, H
EM: hendrik.huwald@epfl.ch
AF: School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, VD CH-1015 Switzerland
AU: Bou-Zeid, E
EM: eliebz@jhu.edu
AF: School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, VD CH-1015 Switzerland
AU: Mezzo, J
EM: julien.mezzo@epfl.ch
AF: School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, VD CH-1015 Switzerland
AU: Chamecki, M
EM: chamecki@jhu.edu
AF: Center for Environmental and Applied Fluid Mechanics, The Johns Hopkins University, Baltimore, MD 21218 United States
AU: Parlange, M B
EM: marc.palrange@epfl.ch
AF: School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, VD CH-1015 Switzerland
AU: Meneveau, C
EM: meneveau@jhu.edu
AF: Center for Environmental and Applied Fluid Mechanics, The Johns Hopkins University, Baltimore, MD 21218 United States
AB: First results from field observations of snow-atmosphere interaction in an alpine environment near Crans-Montana, Switzerland, are presented. The measurements were taken in March and April 2005 at the "Glacier de la Plaine Morte", a seasonally snow covered, flat glacier at a site 2775 m above sea level. A surface energy budget is calculated from measurements of radiative fluxes, skin and air temperatures, humidity, and 3-D wind components from an array of 12 sonic anemometers. The effect of temporal changes in this energy budget on small scale turbulence near the surface is investigated. The high-frequency wind, temperature, and humidity data also allow the computation of the roughness height and scalar roughness of snow, used in the Monin-Obukhov similarity theory. We also look at sublimation and deposition events and the validity of various bulk transfer formulations for the computation of these quantities over a snow cover.
UR: http://eflum.epfl.ch
DE: 0720 Glaciers
DE: 0764 Energy balance
DE: 3307 Boundary layer processes
DE: 3322 Land/atmosphere interactions (1218, 1631, 1843)
DE: 3379 Turbulence (4490)
SC: Cryosphere [C]
MN: Fall Meeting 2005