Heterogeneous grain growth and vertical mass transfer within a snow layer under a temperature gradient
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Published:2023-08-25
Issue:8
Volume:17
Page:3553-3573
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Bouvet LisaORCID, Calonne NeigeORCID, Flin FrédéricORCID, Geindreau ChristianORCID
Abstract
Abstract. Inside a snow cover, metamorphism plays a key role in snow evolution at different scales. This study focuses on the impact of temperature gradient metamorphism on a snow layer in its vertical extent. To this end, two cold-laboratory experiments were conducted to monitor a snow layer evolving under a temperature gradient of 100 K m−1 using X-ray tomography and environmental sensors. The first experiment shows that snow evolves differently in the vertical: in the end, coarser depth hoar is found in the center part of the layer, with covariance lengths about 50 % higher compared to the top and bottom areas. We show that this heterogeneous grain growth could be related to the temperature profile, to the associated crystal growth regimes, and to the local vapor supersaturation. In the second experiment, a non-disturbing sampling method was applied to enable a precise observation of the basal mass transfer in the case of dry boundary conditions. An air gap, characterized by a sharp drop in density, developed at the base and reached more than 3 mm after a month. The two reported phenomena, heterogeneous grain growth and basal mass loss, create heterogeneities in snow – in terms of density, grain and pore size, and ice morphology – from an initial homogeneous layer. Finally, we report the formation of hard depth hoar associated with an increase in specific surface area (SSA) observed in the second experiment with higher initial density. These microscale effects may strongly impact the snowpack behavior, e.g., for snow transport processes or snow mechanics.
Funder
Agence Nationale de la Recherche
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference49 articles.
1. Akitaya, E.: Studies on Depth Hoar, Contributions from the Institute of Low
Temperature Science, 26, 1–67,
http://hdl.handle.net/2115/20238 (last access: 2 August 2023), 1974. a, b, c, d, e, f, g, h, i, j, k 2. Bailey, M. P. and Hallett, J.: A comprehensive habit diagram for atmospheric
ice crystals: confirmation from the laboratory, AIRS II, and other field
studies, J. Atmos. Sci., 66, 2888–2899,
https://doi.org/10.1175/2009JAS2883.1, 2009. a 3. Brzoska, J., Coléou, C., Lesaffre, B., Borel, S., Brissaud, O., Ludwig, W.,
Boller, E., and Baruchel, J.: 3D visualization of snow samples by
microtomography at low temperature, ESRF Newsletter, 32, 22–23,
https://www.umr-cnrm.fr/IMG/pdf/brzoska_1999_esrf.pdf (last access: 2 August 2023), 1999. a 4. Cabanes, A., Legagneux, L., and Dominé, F.: Rate of evolution of the
specific surface area of surface snow layers, Environ. Sci.
Technol., 37, 661–666, https://doi.org/10.1021/es025880r, 2003. a 5. Calonne, N., Flin, F., Morin, S., Lesaffre, B., Rolland du Roscoat, S., and
Geindreau, C.: Numerical and experimental investigations of the effective
thermal conductivity of snow, Geophys. Res. Lett., 38, L23501,
https://doi.org/10.1029/2011GL049234, 2011. a
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