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Thickness and production of sea ice in the Okhotsk Sea coastal polynyas from AMSR-E

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Title: Thickness and production of sea ice in the Okhotsk Sea coastal polynyas from AMSR-E
Authors: Nihashi, Sohey Browse this author
Ohshima, Kay I. Browse this author →KAKEN DB
Tamura, Takeshi Browse this author
Fukamachi, Yasushi Browse this author
Saitoh, Sei-ichi Browse this author →KAKEN DB
Issue Date: 29-Oct-2009
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research : Oceans
Volume: 114
Start Page: C10025
Publisher DOI: 10.1029/2008JC005222
Abstract: From comparisons with thickness of sea ice from AVHRR and ice-profiling sonar data, we have developed an AMSR-E thin ice thickness algorithm for the Sea of Okhotsk. This algorithm can estimate ice thickness of ≤0.2 m without snow using the polarization ratio of AMSR-E brightness temperature at a 36.5 GHz channel from a linear relationship with AVHRR ice thickness. When a snow cover exists on the thin ice surface, as occurred a few times in each winter, it is shown that the algorithm cannot detect the thin ice. Sea-ice and dense shelf water (DSW) production in coastal polynya are estimated based on heat flux calculation with the daily AMSR-E ice thickness for 3 winters (December-March) of 2002/2003 - 2004/2005. The ice production is largest in the northwest shelf (NWS) polynya which accounts for ~45% of the sum of ice production in major coastal polynyas. The ice production in major coastal polynyas would cover the maximum ice area of the Okhotsk Sea if the average ice thickness is assumed to be 1 m. Variability of the ice production is mainly modulated by air temperature. In the NWS polynya, which is the main DSW production area, the annual DSW formation rate is estimated to be ~0.36 Sv.
Rights: An edited version of this paper was published by AGU. Copyright 2009 American Geophysical Union.
Type: article (author version)
URI: http://hdl.handle.net/2115/39843
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)

Submitter: 二橋 創平

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