Ice-free glacial northern Asia due to dust deposition on snow |
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| Authors: | Gerhard Krinner Olivier Boucher Yves Balkanski |
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| Institution: | (1) LGGE, CNRS-UJF Grenoble, BP 96, 38402 Saint Martin d’Hères, France;(2) LOA, CNRS-Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France;(3) Present address: Hadley Centre for Climate Prediction and Research, Met Office, FitzRoy Road, Exeter, EX1 3PB, UK;(4) LSCE, CEA/CNRS Saclay, 91191 Gif sur Yvette Cedex, France |
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| Abstract: | During the Last Glacial Maximum (LGM, 21 kyr BP), no large ice sheets were present in northern Asia, while northern Europe and North America (except Alaska) were heavily glaciated. We use a general circulation model with high regional resolution and a new parameterization of snow albedo to show that the ice-free conditions in northern Asia during the LGM are favoured by strong glacial dust deposition on the seasonal snow cover. Our climate model simulations indicate that mineral dust deposition on the snow surface leads to low snow albedo during the melt season. This, in turn, caused enhanced snow melt and therefore favoured snow-free peak summer conditions over almost the entire Asian continent during the LGM, whereas perennial snow cover is simulated over a large part of eastern Siberia when glacial dust deposition is not taken into account. |
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