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Direct observations of sea-ice thickness and brine rejection off Sakhalin in the Sea of Okhotsk

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Title: Direct observations of sea-ice thickness and brine rejection off Sakhalin in the Sea of Okhotsk
Authors: Fukamachi, Yasushi Browse this author →KAKEN DB
Shirasawa, Kunio Browse this author →KAKEN DB
Polomoshnov, Anatoliy M. Browse this author
Ohshima, Kay I. Browse this author →KAKEN DB
Kalinin, Ervin Browse this author
Nihashi, Sohey Browse this author
Melling, Humfrey Browse this author
Mizuta, Genta Browse this author
Wakatsuchi, Masaaki Browse this author
Keywords: Sea ice
Ice thickness
Polynyas
Time series
Ice-profiling sonar
Brine rejection
The Sea of Okhotsk
Issue Date: 15-Jun-2009
Publisher: Elsevier Ltd.
Journal Title: Continental Shelf Research
Volume: 29
Issue: 11-12
Start Page: 1541
End Page: 1548
Publisher DOI: 10.1016/j.csr.2009.04.005
Abstract: From December to June 2002-03, sea-ice and oceanic data were obtained from moorings near Sakhalin in the west central Okhotsk Sea. Ice draft measured by sonar reveals distinct periods of thin and thick ice. Thin-ice periods in January-March corresponded to offshore ice movement and increasing seawater salinity. The measured change in salinity corresponds well with that derived from heat-flux calculations using the observed ice thickness. Brine rejection from ice growing in a coastal polynya off northern Sakhalin is responsible for much of the observed salinity increase. The simultaneous observation of Dense shelf water (> 26.7σθ) suggests that this region is one possible source. The periods of thick-ice incursion are likely indicative of heavily deformed pack formed further north and drifting south with the current. The mean draft (1.95 m), thick-ice ratio, and keel frequency during these periods are close to values observed in the Beaufort Sea. Freshwater transport estimated from the observed ice thickness and velocity is larger than that of the Amur River discharge.
Type: article (author version)
URI: http://hdl.handle.net/2115/38838
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: 深町 康

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