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Motion of dust particles in dry snow under temperature gradient metamorphism
Abstract : Abstract. The deposition of light-absorbing particles (LAPs) such as mineral dust and black carbon on snow is responsible for a highly effective climate forcing, through darkening of the snow surface and associated feedbacks. The interplay between post-depositional snow transformation (metamorphism) and the dynamics of LAPs in snow remains largely unknown. We obtained time series of X-ray tomography images of dust-contaminated samples undergoing dry snow metamorphism at around −2 ∘C. They provide the first observational evidence that temperature gradient metamorphism induces dust particle motion in snow, while no movement is observed under isothermal conditions. Under temperature gradient metamorphism, dust particles can enter the ice matrix due to sublimation–condensation processes and spread down mainly by falling into the pore space. Overall, such motions might reduce the radiative impact of dust in snow, in particular in arctic regions where temperature gradient metamorphism prevails.
https://hal-meteofrance.archives-ouvertes.fr/meteo-03657903
Contributor : Samuel Morin Connect in order to contact the contributor
Submitted on : Tuesday, May 3, 2022 - 3:48:22 PM
Last modification on : Wednesday, May 18, 2022 - 8:28:41 AM
Contributor : Samuel Morin Connect in order to contact the contributor
Submitted on : Tuesday, May 3, 2022 - 3:48:22 PM
Last modification on : Wednesday, May 18, 2022 - 8:28:41 AM
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tc-13-2345-2019.pdf
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