Abstract
Vertical profiles of wind speed, temperature and humidity were used to estimate the roughness lengths for momentum (z0), heat (z H ) and moisture (zQ) over smooth ice and snow surfaces. The profile-measurements were performed in the vicinity of a blue ice field in Queen Maud Land, East Antarctica. The values ofz0 over ice (∼3·10−6 m) seem to be the smallest ever obtained over permanent, natural surfaces. The settling of snow on the ice and the loss of momentum at saltating snow particles serve as momentum dissipating processes during snow-drift events, expressed as a strong dependence ofz0 on u#.
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