Erroneous sea-ice concentration retrieval in the East Antarctic
Large discrepancies have been observed between satellite-derived sea-ice concentrations(IC) from passive microwave remote sensing and those derived from optical images at several locations in the East Antarctic, between February and April 2014. These artefacts, that resemble polynyas in the IC maps,...
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ftunivtasmania:oai:eprints.utas.edu.au:29952 2023-05-15T13:29:44+02:00 Erroneous sea-ice concentration retrieval in the East Antarctic Lam, HM Spreen, G Heygster, G Melsheimer, C Young, NW 2018 application/pdf https://eprints.utas.edu.au/29952/ https://eprints.utas.edu.au/29952/1/131760%20-%20Erroneous%20sea-ice%20concentration%20retrieval%20in%20the%20East%20Antarctic.pdf en eng Int Glaciol Soc https://eprints.utas.edu.au/29952/1/131760%20-%20Erroneous%20sea-ice%20concentration%20retrieval%20in%20the%20East%20Antarctic.pdf Lam, HM, Spreen, G, Heygster, G, Melsheimer, C and Young, NW 2018 , 'Erroneous sea-ice concentration retrieval in the East Antarctic' , Annals of Glaciology, vol. 59, no. 76pt2 , pp. 201-212 , doi:10.1017/aog.2018.1 <http://dx.doi.org/10.1017/aog.2018.1>. atmosphere/ice/ocean interactions remote sensing sea ice sea-ice geophysics Article PeerReviewed 2018 ftunivtasmania https://doi.org/10.1017/aog.2018.1 2021-09-13T22:19:30Z Large discrepancies have been observed between satellite-derived sea-ice concentrations(IC) from passive microwave remote sensing and those derived from optical images at several locations in the East Antarctic, between February and April 2014. These artefacts, that resemble polynyas in the IC maps, appear in areas where optical satellite data show that there is landfast sea ice. The IC datasets and the corresponding retrieval algorithms are investigated together with microwave brightness temperature, air temperature, snowfall and bathymetry to understand the failure of the IC retrieval. The artefacts are the result of the application of weather filters in retrieval algorithms. These filters use the 37 and 19 GHz channels to correct for atmospheric effects on the retrieval. These channels show significant departures from typical ranges when the artefacts occur. A melt–refreeze cycle with associated snow metamorphism is proposed as the most likely cause. Together, the areas of the artefacts account for up to 0.5% of the Antarctic sea-ice area and thus cause a bias in sea-IC time series. In addition, erroneous sea ICs can adversely affect shipping operations. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Sea ice University of Tasmania: UTas ePrints Antarctic The Antarctic Annals of Glaciology 59 76pt2 201 212 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
atmosphere/ice/ocean interactions remote sensing sea ice sea-ice geophysics |
spellingShingle |
atmosphere/ice/ocean interactions remote sensing sea ice sea-ice geophysics Lam, HM Spreen, G Heygster, G Melsheimer, C Young, NW Erroneous sea-ice concentration retrieval in the East Antarctic |
topic_facet |
atmosphere/ice/ocean interactions remote sensing sea ice sea-ice geophysics |
description |
Large discrepancies have been observed between satellite-derived sea-ice concentrations(IC) from passive microwave remote sensing and those derived from optical images at several locations in the East Antarctic, between February and April 2014. These artefacts, that resemble polynyas in the IC maps, appear in areas where optical satellite data show that there is landfast sea ice. The IC datasets and the corresponding retrieval algorithms are investigated together with microwave brightness temperature, air temperature, snowfall and bathymetry to understand the failure of the IC retrieval. The artefacts are the result of the application of weather filters in retrieval algorithms. These filters use the 37 and 19 GHz channels to correct for atmospheric effects on the retrieval. These channels show significant departures from typical ranges when the artefacts occur. A melt–refreeze cycle with associated snow metamorphism is proposed as the most likely cause. Together, the areas of the artefacts account for up to 0.5% of the Antarctic sea-ice area and thus cause a bias in sea-IC time series. In addition, erroneous sea ICs can adversely affect shipping operations. |
format |
Article in Journal/Newspaper |
author |
Lam, HM Spreen, G Heygster, G Melsheimer, C Young, NW |
author_facet |
Lam, HM Spreen, G Heygster, G Melsheimer, C Young, NW |
author_sort |
Lam, HM |
title |
Erroneous sea-ice concentration retrieval in the East Antarctic |
title_short |
Erroneous sea-ice concentration retrieval in the East Antarctic |
title_full |
Erroneous sea-ice concentration retrieval in the East Antarctic |
title_fullStr |
Erroneous sea-ice concentration retrieval in the East Antarctic |
title_full_unstemmed |
Erroneous sea-ice concentration retrieval in the East Antarctic |
title_sort |
erroneous sea-ice concentration retrieval in the east antarctic |
publisher |
Int Glaciol Soc |
publishDate |
2018 |
url |
https://eprints.utas.edu.au/29952/ https://eprints.utas.edu.au/29952/1/131760%20-%20Erroneous%20sea-ice%20concentration%20retrieval%20in%20the%20East%20Antarctic.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Annals of Glaciology Antarc* Antarctic Sea ice |
genre_facet |
Annals of Glaciology Antarc* Antarctic Sea ice |
op_relation |
https://eprints.utas.edu.au/29952/1/131760%20-%20Erroneous%20sea-ice%20concentration%20retrieval%20in%20the%20East%20Antarctic.pdf Lam, HM, Spreen, G, Heygster, G, Melsheimer, C and Young, NW 2018 , 'Erroneous sea-ice concentration retrieval in the East Antarctic' , Annals of Glaciology, vol. 59, no. 76pt2 , pp. 201-212 , doi:10.1017/aog.2018.1 <http://dx.doi.org/10.1017/aog.2018.1>. |
op_doi |
https://doi.org/10.1017/aog.2018.1 |
container_title |
Annals of Glaciology |
container_volume |
59 |
container_issue |
76pt2 |
container_start_page |
201 |
op_container_end_page |
212 |
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1766002494516756480 |