Recent observations of superimposed ice and snow ice on sea ice in the northwestern Weddell Sea
Recent low summer sea ice extent in the Weddell Sea raises questions about the contributions of dynamic and thermodynamic atmospheric and oceanic energy fluxes. The roles of snow, superimposed ice, and snow ice are particularly intriguing, as they are sensitive indicators for changes in atmospheric...
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ftcopernicus:oai:publications.copernicus.org:tcd94474 2023-05-15T16:39:13+02:00 Recent observations of superimposed ice and snow ice on sea ice in the northwestern Weddell Sea Arndt, Stefanie Haas, Christian Meyer, Hanno Peeken, Ilka Krumpen, Thomas 2021-05-12 application/pdf https://doi.org/10.5194/tc-2021-136 https://tc.copernicus.org/preprints/tc-2021-136/ eng eng doi:10.5194/tc-2021-136 https://tc.copernicus.org/preprints/tc-2021-136/ eISSN: 1994-0424 Text 2021 ftcopernicus https://doi.org/10.5194/tc-2021-136 2021-05-17T16:22:14Z Recent low summer sea ice extent in the Weddell Sea raises questions about the contributions of dynamic and thermodynamic atmospheric and oceanic energy fluxes. The roles of snow, superimposed ice, and snow ice are particularly intriguing, as they are sensitive indicators for changes in atmospheric forcing, and as they could trigger snow-albedo feedbacks that could accelerate ice melt. Here we present snow depth data and ice core observations of superimposed ice and snow ice collected in the northwestern Weddell Sea in late austral summer of 2019, supplemented by airborne ice thickness measurements. Texture, salinity, and oxygen isotope analyses showed mean thicknesses of superimposed and snow ice of 0.11 ± 0.11 m and 0.22 ± 0.22 m, respectively, or 3 to 54 % of total ice thickness. Mean snow depths ranged between 0.46 ± 0.29 m in the south to 0.05 ± 0.06 m in the north, with mean and modal, total ice thicknesses between 4.12 ± 1.87 m to 1.62 ± 1.05 m, and 3.9 m to 0.9 m, respectively. These snow and ice properties are similar to results from previous studies, suggesting that the ice’s summer surface energy balance and related seasonal transition of snow properties have changed little in past decades. This is supported by our additional analyses of the summer energy balance using atmospheric reanalysis data, and melt onset observations from satellite scatterometry showing little recent changes. Text ice core Sea ice Weddell Sea Copernicus Publications: E-Journals Austral Weddell Weddell Sea |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Recent low summer sea ice extent in the Weddell Sea raises questions about the contributions of dynamic and thermodynamic atmospheric and oceanic energy fluxes. The roles of snow, superimposed ice, and snow ice are particularly intriguing, as they are sensitive indicators for changes in atmospheric forcing, and as they could trigger snow-albedo feedbacks that could accelerate ice melt. Here we present snow depth data and ice core observations of superimposed ice and snow ice collected in the northwestern Weddell Sea in late austral summer of 2019, supplemented by airborne ice thickness measurements. Texture, salinity, and oxygen isotope analyses showed mean thicknesses of superimposed and snow ice of 0.11 ± 0.11 m and 0.22 ± 0.22 m, respectively, or 3 to 54 % of total ice thickness. Mean snow depths ranged between 0.46 ± 0.29 m in the south to 0.05 ± 0.06 m in the north, with mean and modal, total ice thicknesses between 4.12 ± 1.87 m to 1.62 ± 1.05 m, and 3.9 m to 0.9 m, respectively. These snow and ice properties are similar to results from previous studies, suggesting that the ice’s summer surface energy balance and related seasonal transition of snow properties have changed little in past decades. This is supported by our additional analyses of the summer energy balance using atmospheric reanalysis data, and melt onset observations from satellite scatterometry showing little recent changes. |
format |
Text |
author |
Arndt, Stefanie Haas, Christian Meyer, Hanno Peeken, Ilka Krumpen, Thomas |
spellingShingle |
Arndt, Stefanie Haas, Christian Meyer, Hanno Peeken, Ilka Krumpen, Thomas Recent observations of superimposed ice and snow ice on sea ice in the northwestern Weddell Sea |
author_facet |
Arndt, Stefanie Haas, Christian Meyer, Hanno Peeken, Ilka Krumpen, Thomas |
author_sort |
Arndt, Stefanie |
title |
Recent observations of superimposed ice and snow ice on sea ice in the northwestern Weddell Sea |
title_short |
Recent observations of superimposed ice and snow ice on sea ice in the northwestern Weddell Sea |
title_full |
Recent observations of superimposed ice and snow ice on sea ice in the northwestern Weddell Sea |
title_fullStr |
Recent observations of superimposed ice and snow ice on sea ice in the northwestern Weddell Sea |
title_full_unstemmed |
Recent observations of superimposed ice and snow ice on sea ice in the northwestern Weddell Sea |
title_sort |
recent observations of superimposed ice and snow ice on sea ice in the northwestern weddell sea |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-2021-136 https://tc.copernicus.org/preprints/tc-2021-136/ |
geographic |
Austral Weddell Weddell Sea |
geographic_facet |
Austral Weddell Weddell Sea |
genre |
ice core Sea ice Weddell Sea |
genre_facet |
ice core Sea ice Weddell Sea |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2021-136 https://tc.copernicus.org/preprints/tc-2021-136/ |
op_doi |
https://doi.org/10.5194/tc-2021-136 |
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1766029552527605760 |