PRELIMINARY RESULTS OF HYDROGRAPHY UNDER FAST ICE IN LUTZOW-HOLM BAY, ANTARCTICA IN 1990

元データ 国立極地研究所

概要

Seasonal variations in water structure under fast ice in Lutzow-Holm Bay, Antarctica, were observed from April to December, 1990. Two warm and oxygen-poor waters were observed. One is warmer water with temperatures higher than 0℃, salinities of more than 34.6 and oxygen less than 6 ml/l, and is found in the bottom layer deeper than 700m in the Shirase Submarine Valley. The other is found in the upper layer with temperatures of -1.4∿ -1.5℃, salinities of around 34.2 and oxygen of 6.3-6.9ml/l. The origin of both waters is a blob of the Circumpolar Deep Water (CDW) drawn from offshore, and they are admixtures of CDW with overlying Winter Water in various proportions. Due to high density, the former is confined to the bottom layers of deep troughs; on the contrary, the latter with low density can migrate in the upper layer with the water circulation in the bay. In spring a cold and oxygen-rich water (T<-1.6℃, O_2>7.2ml/l) was observed at the intermediate depth of about 250m-350m near the top of the downslope of the submarine valley. It is probable that this water was formed by sea ice processes during winter.

著者

Kawaguchi Sadao Nagaoka National College Of Technology
Ushio Shuki National Institute Of Polar Research
Shimohara Kimiko Kitami Institute of Technology
ONO Nobuo National Institute of Polar Research
KAWAGUCHI Sadao National Institute of Polar Research
Takizawa Takatoshi Japan Marine Science and Technology Center
TAKIZAWA Takatoshi Institute of Low Temperature Science, Hokkaido University
KAWAMURA Toshiyuki Institute of Low Temperature Science, Hokkaido University
OHSHIMA Kay Institute of Low Temperature Science, Hokkaido University
Kawamura Toshiyuki Institute Of Low Temperature Science Hokkaido University
Kanamori Satoru Institute For Hydrospheric And Atmospheric Sciences Nagoya University
Ohshima K Hokkaido Univ. Sapporo Jpn
Ohshima Kay The Institute Of Low Temperature Science Hokkaido University
Ohshima Kay Hokkaido Univ. Sapporo Jpn
Ohshima Kay Institute Of Low Temperature Science Hokkaido University
Kanamori Satoru National Institute of Polar Research
Ohshima Kay Institute Of Llow Temperature Science Hokkaido University
Satow Kazuhide Nagoya Technical College
Ono N National Institute Of Polar Research
Shinbori K Hokkaido Univ. Sapporo

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