Comparing methods of measuring sea-ice density in the East Antarctic
Remotely sensed derivation of sea-ice thickness requires sea·ice density. Sea-ice density was estimated with three techniques during the second Sea Ice Physics and Ecosystem eXperiment (SIPEX-II, September-November 2012, East Antarctica). The sea ice was first-year highly deformed, mean thickness 1....
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ftoregonstate:ir.library.oregonstate.edu:s1784r351 2023-06-18T03:38:11+02:00 Comparing methods of measuring sea-ice density in the East Antarctic Hutchings, Jennifer K. Heil, Petra Lecomte, Oliver Stevens, Roger Steer, Adam Lieser, Jan L. https://ir.library.oregonstate.edu/concern/articles/s1784r351 English [eng] eng International Glaciological Society https://ir.library.oregonstate.edu/concern/articles/s1784r351 Copyright Not Evaluated Sea ice Article ftoregonstate 2023-06-04T16:53:05Z Remotely sensed derivation of sea-ice thickness requires sea·ice density. Sea-ice density was estimated with three techniques during the second Sea Ice Physics and Ecosystem eXperiment (SIPEX-II, September-November 2012, East Antarctica). The sea ice was first-year highly deformed, mean thickness 1.2 m with layers, consistent with rafting, and 6-7/10 columnar ice and 3/10 granular ice. Ice density was found to be lower than values (900-920 kg m⁻³ used previously to derive ice thickness, with columnar ice mean density of 870 kg m⁻³. At two different ice stations the mean density of the ice was 870 and 800 kg m⁻³, the lower density reflecting a high percentage of porous granular ice at the second station. Error estimates for mass/volume and liquid/solid water methods are presented. With 0.1 m long, 0.1 m core samples, the error on individual density estimates is 28 kg m⁻³. Errors are larger for smaller machined blocks. Errors increase to 46 kg m⁻³ if the liquid/solid volume method is used. The mass/volume method has a low bias due to brine drainage of at least 5%. Bulk densities estimated from ice and snow measurements along 100 m transects were high, and likely unrealistic as the assumption of isostatic balance is not suitable over these length scales in deformed ice. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice ScholarsArchive@OSU (Oregon State University) Antarctic East Antarctica |
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Open Polar |
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ScholarsArchive@OSU (Oregon State University) |
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ftoregonstate |
language |
English |
topic |
Sea ice |
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Sea ice Hutchings, Jennifer K. Heil, Petra Lecomte, Oliver Stevens, Roger Steer, Adam Lieser, Jan L. Comparing methods of measuring sea-ice density in the East Antarctic |
topic_facet |
Sea ice |
description |
Remotely sensed derivation of sea-ice thickness requires sea·ice density. Sea-ice density was estimated with three techniques during the second Sea Ice Physics and Ecosystem eXperiment (SIPEX-II, September-November 2012, East Antarctica). The sea ice was first-year highly deformed, mean thickness 1.2 m with layers, consistent with rafting, and 6-7/10 columnar ice and 3/10 granular ice. Ice density was found to be lower than values (900-920 kg m⁻³ used previously to derive ice thickness, with columnar ice mean density of 870 kg m⁻³. At two different ice stations the mean density of the ice was 870 and 800 kg m⁻³, the lower density reflecting a high percentage of porous granular ice at the second station. Error estimates for mass/volume and liquid/solid water methods are presented. With 0.1 m long, 0.1 m core samples, the error on individual density estimates is 28 kg m⁻³. Errors are larger for smaller machined blocks. Errors increase to 46 kg m⁻³ if the liquid/solid volume method is used. The mass/volume method has a low bias due to brine drainage of at least 5%. Bulk densities estimated from ice and snow measurements along 100 m transects were high, and likely unrealistic as the assumption of isostatic balance is not suitable over these length scales in deformed ice. |
format |
Article in Journal/Newspaper |
author |
Hutchings, Jennifer K. Heil, Petra Lecomte, Oliver Stevens, Roger Steer, Adam Lieser, Jan L. |
author_facet |
Hutchings, Jennifer K. Heil, Petra Lecomte, Oliver Stevens, Roger Steer, Adam Lieser, Jan L. |
author_sort |
Hutchings, Jennifer K. |
title |
Comparing methods of measuring sea-ice density in the East Antarctic |
title_short |
Comparing methods of measuring sea-ice density in the East Antarctic |
title_full |
Comparing methods of measuring sea-ice density in the East Antarctic |
title_fullStr |
Comparing methods of measuring sea-ice density in the East Antarctic |
title_full_unstemmed |
Comparing methods of measuring sea-ice density in the East Antarctic |
title_sort |
comparing methods of measuring sea-ice density in the east antarctic |
publisher |
International Glaciological Society |
url |
https://ir.library.oregonstate.edu/concern/articles/s1784r351 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
op_relation |
https://ir.library.oregonstate.edu/concern/articles/s1784r351 |
op_rights |
Copyright Not Evaluated |
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1769003065452527616 |