Identifying airborne snow metamorphism with stable water isotopes
Wind-blown snow is a frequent phenomenon in high-elevation and polar regions which impacts the surface energy and mass balance of these areas. Loose surface snow gets eroded and transported by wind which influences the snow particle’s physical properties (size, shape, optical properties) t...
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ftcopernicus:oai:publications.copernicus.org:egusphere118765 2024-09-15T18:12:04+00:00 Identifying airborne snow metamorphism with stable water isotopes Wahl, Sonja Walter, Benjamin Aemisegger, Franziska Bianchi, Luca Lehning, Michael 2024-04-08 application/pdf https://doi.org/10.5194/egusphere-2024-745 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-745/ eng eng doi:10.5194/egusphere-2024-745 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-745/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2024-745 2024-08-28T05:24:15Z Wind-blown snow is a frequent phenomenon in high-elevation and polar regions which impacts the surface energy and mass balance of these areas. Loose surface snow gets eroded and transported by wind which influences the snow particle’s physical properties (size, shape, optical properties) that determine the characteristics of the emerging wind-impacted snowpack layer. During airborne snow transport, the governing processes are happening on the micro-scale, while the particles are transported over long distances. The unfolding processes and the evolution of the particle’s physical properties are thus difficult to observe in-situ. Here we used cold-laboratory ring wind tunnel experiments as an interim solution to study the governing processes during airborne snow transport with stable water isotopes as tracers for these micro-scale processes. Repeated analysis of airborne-sampled snow by micro-computed tomography (μCT) documented a growing and rounding of snow particles with transport time with a concurrent decrease in specific surface area. Stable water isotope analysis of airborne snow and water vapour allowed us to attribute this evolution to the process of airborne snow metamorphism. The changes observed in the snow isotopic composition showed a clear isotopic signature of metamorphic deposition, which requires particle-air temperature gradients. These results question the validity of the thermal equilibrium assumption between particles and air inside the saltation layer of wind-blown snow events where the conditions are similar to the ones found in the wind tunnel. Our results thus refine the understanding of the governing processes in the saltation layer and suggest that the snow’s isotopic composition can inform on local wind-blown snow events as the original snow isotope signal gets overprinted by airborne snow metamorphism. Thus, airborne snow metamorphism has the potential to influence the climate signal stored in snow and ice core stable water isotope records. Text ice core Copernicus Publications: E-Journals |
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English |
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Wind-blown snow is a frequent phenomenon in high-elevation and polar regions which impacts the surface energy and mass balance of these areas. Loose surface snow gets eroded and transported by wind which influences the snow particle’s physical properties (size, shape, optical properties) that determine the characteristics of the emerging wind-impacted snowpack layer. During airborne snow transport, the governing processes are happening on the micro-scale, while the particles are transported over long distances. The unfolding processes and the evolution of the particle’s physical properties are thus difficult to observe in-situ. Here we used cold-laboratory ring wind tunnel experiments as an interim solution to study the governing processes during airborne snow transport with stable water isotopes as tracers for these micro-scale processes. Repeated analysis of airborne-sampled snow by micro-computed tomography (μCT) documented a growing and rounding of snow particles with transport time with a concurrent decrease in specific surface area. Stable water isotope analysis of airborne snow and water vapour allowed us to attribute this evolution to the process of airborne snow metamorphism. The changes observed in the snow isotopic composition showed a clear isotopic signature of metamorphic deposition, which requires particle-air temperature gradients. These results question the validity of the thermal equilibrium assumption between particles and air inside the saltation layer of wind-blown snow events where the conditions are similar to the ones found in the wind tunnel. Our results thus refine the understanding of the governing processes in the saltation layer and suggest that the snow’s isotopic composition can inform on local wind-blown snow events as the original snow isotope signal gets overprinted by airborne snow metamorphism. Thus, airborne snow metamorphism has the potential to influence the climate signal stored in snow and ice core stable water isotope records. |
format |
Text |
author |
Wahl, Sonja Walter, Benjamin Aemisegger, Franziska Bianchi, Luca Lehning, Michael |
spellingShingle |
Wahl, Sonja Walter, Benjamin Aemisegger, Franziska Bianchi, Luca Lehning, Michael Identifying airborne snow metamorphism with stable water isotopes |
author_facet |
Wahl, Sonja Walter, Benjamin Aemisegger, Franziska Bianchi, Luca Lehning, Michael |
author_sort |
Wahl, Sonja |
title |
Identifying airborne snow metamorphism with stable water isotopes |
title_short |
Identifying airborne snow metamorphism with stable water isotopes |
title_full |
Identifying airborne snow metamorphism with stable water isotopes |
title_fullStr |
Identifying airborne snow metamorphism with stable water isotopes |
title_full_unstemmed |
Identifying airborne snow metamorphism with stable water isotopes |
title_sort |
identifying airborne snow metamorphism with stable water isotopes |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-745 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-745/ |
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ice core |
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ice core |
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eISSN: |
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doi:10.5194/egusphere-2024-745 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-745/ |
op_doi |
https://doi.org/10.5194/egusphere-2024-745 |
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1810449650818220032 |