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Mapping of Active Frazil for Antarctic Coastal Polynyas, With an Estimation of Sea-Ice Production
| 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 |
| URI: | http://hdl.handle.net/2115/81776 |
| 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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