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Soot-on-snow experiment: artificial deposition of light-absorbing particles onto snow surfaces in 2018
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Number of Authors: 142024 (English)In: Frontiers in Earth Science, E-ISSN 2296-6463, Vol. 12, article id 1358155Article in journal (Refereed) Published
Abstract [en]

The absorption of shortwave irradiance in snow depends on the physical properties of snow (e.g., snow grain size and shape, liquid water content, etc.) and light-absorbing particles (LAP). Originating from natural and anthropogenic sources, LAP has been reported to accelerate snowmelt significantly in different regions globally. Yet, our process-level understanding of LAP after deposition onto snow remains rather limited. Here we investigate the impacts of artificial deposition of different LAP onto snow surfaces in an outdoor environment of northern Finland. Following LAP dry deposition into a custom-made tent standing on top of the snowpack, the albedo was followed along with the properties of snow in snow pit measurements throughout the spring season. The results showed that the albedo decay at the end of the season for the different spots were linked to the initial amount and type of LAP that were deposited onto the snowpack. Measured snow temperature profiles from LAP doped snow versus natural reference snow illustrated that the LAP affected snow had higher temperatures in the subsurface snow layers. Collected snow samples analyzed for size distribution of soot particles revealed no apparent agglomeration of soot particles during thaw-freezing events taking place during the experiment. Despite the relatively large perturbation of the experimentally deposited LAP, their impact on the season length was only up to 3 days. Additional experiments are, nevertheless, needed to better constrain the effects of LAP on snow albedo, melt rate, and other associated processes.

Place, publisher, year, edition, pages
2024. Vol. 12, article id 1358155
Keywords [en]
snow properties, snow albedo, light-absorbing particles, northern Finland, experiments
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-227741DOI: 10.3389/feart.2024.1358155ISI: 001178687200001Scopus ID: 2-s2.0-85187114982OAI: oai:DiVA.org:su-227741DiVA, id: diva2:1847096
Available from: 2024-03-26 Created: 2024-03-26 Last updated: 2024-03-26Bibliographically approved

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Ström, Johan

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Department of Environmental ScienceDepartment of Meteorology
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