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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Online Access: | https://doi.org/10.1017/aog.2018.1 http://ecite.utas.edu.au/131760 |
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ftunivtasecite:oai:ecite.utas.edu.au:131760 2023-05-15T13:29:45+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://doi.org/10.1017/aog.2018.1 http://ecite.utas.edu.au/131760 en eng Int Glaciol Soc http://ecite.utas.edu.au/131760/1/131760 - Erroneous sea-ice concentration retrieval in the East Antarctic.pdf http://dx.doi.org/10.1017/aog.2018.1 Lam, HM and Spreen, G and Heygster, G and Melsheimer, C and Young, NW, Erroneous sea-ice concentration retrieval in the East Antarctic, Annals of Glaciology, 59, (76pt2) pp. 201-212. ISSN 0260-3055 (2018) [Refereed Article] http://ecite.utas.edu.au/131760 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2018 ftunivtasecite https://doi.org/10.1017/aog.2018.1 2019-12-13T22:29:41Z 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 meltrefreeze 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 eCite UTAS (University of Tasmania) Antarctic The Antarctic Annals of Glaciology 59 76pt2 201 212 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
spellingShingle |
Earth Sciences Oceanography Physical Oceanography Lam, HM Spreen, G Heygster, G Melsheimer, C Young, NW Erroneous sea-ice concentration retrieval in the East Antarctic |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
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 meltrefreeze 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://doi.org/10.1017/aog.2018.1 http://ecite.utas.edu.au/131760 |
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 |
http://ecite.utas.edu.au/131760/1/131760 - Erroneous sea-ice concentration retrieval in the East Antarctic.pdf http://dx.doi.org/10.1017/aog.2018.1 Lam, HM and Spreen, G and Heygster, G and Melsheimer, C and Young, NW, Erroneous sea-ice concentration retrieval in the East Antarctic, Annals of Glaciology, 59, (76pt2) pp. 201-212. ISSN 0260-3055 (2018) [Refereed Article] http://ecite.utas.edu.au/131760 |
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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1766002667229806592 |