Abstract
Wind tunnel simulations of aeolian transport carried out over a range in mean temperature between 32βΒ°C and β9βΒ°C suggest that cold airflows support higher mass transport rates (Q) than very warm air. The magnitude of this increase is larger than expected, so that analytical and semiβempirical models underestimate Q. Extrapolation of the results suggests that, at β40βΒ°C, as for example in the dry valleys of Antarctica in winter, Q may be as much as 70% higher than for the equivalent wind speed in hot deserts at air temperatures of 40βΒ°C. Temperatureβdependent changes in air density and turbulence contribute to this result. The decreased tension of water adsorbed onto particle surfaces at low temperatures is postulated to reduce interparticle cohesion and, thus, to increase the elasticity of particle impacts on cold beds. Definition of the roles that temperature and humidity play in aeolian transport is relevant to studies of palaeoenvironmental reconstruction and extraterrestrial (or planetary) geology. Investigation of presentβday, cold climate features and of climate change effects also requires knowledge of these fundamental relations.