open access

https://hdl.handle.net/2115/81776

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

英語

Southern Ocean

2021-03-28

American Geophysical Union

Geophysical research letters

48(6)

e2020GL091353

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.

学術雑誌論文

Version of Record

Copyright 2021 American Geophysical Union.

0094-8276