Erroneous sea-ice concentration retrieval in the East Antarctic
ABSTRACT 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...
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crcambridgeupr:10.1017/aog.2018.1 2024-06-09T07:38:30+00:00 Erroneous sea-ice concentration retrieval in the East Antarctic Lam, Hoi Ming Spreen, Gunnar Heygster, Georg Melsheimer, Christian Young, Neal W. 2018 http://dx.doi.org/10.1017/aog.2018.1 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305518000010 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Annals of Glaciology volume 59, issue 76pt2, page 201-212 ISSN 0260-3055 1727-5644 journal-article 2018 crcambridgeupr https://doi.org/10.1017/aog.2018.1 2024-05-15T13:14:55Z ABSTRACT 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 Cambridge University Press Antarctic The Antarctic Annals of Glaciology 59 76pt2 201 212 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
ABSTRACT 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, Hoi Ming Spreen, Gunnar Heygster, Georg Melsheimer, Christian Young, Neal W. |
spellingShingle |
Lam, Hoi Ming Spreen, Gunnar Heygster, Georg Melsheimer, Christian Young, Neal W. Erroneous sea-ice concentration retrieval in the East Antarctic |
author_facet |
Lam, Hoi Ming Spreen, Gunnar Heygster, Georg Melsheimer, Christian Young, Neal W. |
author_sort |
Lam, Hoi Ming |
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 |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/aog.2018.1 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305518000010 |
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_source |
Annals of Glaciology volume 59, issue 76pt2, page 201-212 ISSN 0260-3055 1727-5644 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
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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1801373315577675776 |