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Mapping of Active Frazil for Antarctic Coastal Polynyas, With an Estimation of Sea-Ice Production

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Title: Mapping of Active Frazil for Antarctic Coastal Polynyas, With an Estimation of Sea-Ice Production
Authors: Nakata, K. Browse this author
Ohshima, K. I. Browse this author →KAKEN DB
Nihashi, S. Browse this author
Keywords: coastal polynya
frazil ice
ice type
passive microwaves
sea ice production
Southern Ocean
Issue Date: 28-Mar-2021
Publisher: American Geophysical Union
Journal Title: Geophysical research letters
Volume: 48
Issue: 6
Start Page: e2020GL091353
Publisher DOI: 10.1029/2020GL091353
Abstract: The importance of the area of active frazil and associated high sea-ice production in Antarctic coastal polynyas has been increasingly recognized in recent in situ and high-resolution satellite observations. However, the occurrence and spatial distribution of active-frazil area are not well understood. We present the first mapping of active-frazil area for Antarctic coastal polynyas, based on the thin ice algorithm of AMSR-E that discriminates active-frazil area. Mapping of sea-ice production is presented by taking account of active-frazil area. Active-frazil area is predominant along East Antarctica, particularly very close to the coast, locally leading to very high ice-production rates exceeding 20 m/yr. For frazil-dominant polynyas, estimated ice production is similar to 20%-50% higher compared with previous studies. Analyses of all the major polynyas suggest that active-frazil extent depends on offshore wind and air temperature, while ice production is determined by offshore wind only.
Rights: Copyright 2021 American Geophysical Union.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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