Articles | Volume 13, issue 9
Research article
06 Sep 2019
Research article |  | 06 Sep 2019

Motion of dust particles in dry snow under temperature gradient metamorphism

Pascal Hagenmuller, Frederic Flin, Marie Dumont, François Tuzet, Isabel Peinke, Philippe Lapalus, Anne Dufour, Jacques Roulle, Laurent Pézard, Didier Voisin, Edward Ando, Sabine Rolland du Roscoat, and Pascal Charrier

Data sets

Dust motion in snow microstructure P. Hagenmuller, F. Flin, M. Dumont, F. Tuzet, I. Peinke, P. Lapalus, A. Dufour, J. Roulle, L. Pezard, D. Voisin, E. Ando, S. Rolland du Roscoat, and P. Charrier

Short summary
Light–absorbing particles (LAPs, e.g. dust or black carbon) in snow are a potent climate forcing agent. Their presence darkens the snow surface and leads to higher solar energy absorption. Several studies have quantified this radiative impact by assuming that LAPs were motionless in dry snow, without any clear evidence of this assumption. Using time–lapse X–ray tomography, we show that temperature gradient metamorphism of snow induces downward motion of LAPs, leading to self–cleaning of snow.