Quantitative evaluations of ocean circulation and meridional themohaline transport in the Indian sector of Antarctic
| Project/Area Number |
17340138
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Hokkaido University |
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Principal Investigator |
WAKATSUCHI Masaaki Hokkaido University, Institute of Low Temperature Science, Professor (60002101)
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| Co-Investigator(Kenkyū-buntansha) |
OHSHIMA Keiichiro Hokkaido Univ, Institute of Low Temperature Science, Associate Professor (30185251)
AOKI Shigeru Hokkaido Univ, Institute of Low Temperature Science, Associate Professor (80281583)
FUKAMACHI Yasushi Hokkaido University, Institute of Low Temperature Science, Assi. Prof. (20250508)
USHIO Shuki National Institute of Polar Research Atmospere Ocean Research Group, 情報・システム研究機構・国立極地研究所, Assi. Prof. (50211769)
木村 詞明 北海道大学, 低温科学研究所, 博士研究員 (20374647)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥16,780,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2007: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2006: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2005: ¥5,000,000 (Direct Cost: ¥5,000,000)
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| Keywords | Ocean Circuation / Antarctic Ocean / Meridional Thermohaline Transport / Antarctic Bottom Water / Coastal Polynya / Variability of Sea-Ice Extent / Climatic Change / Earth Environment / 南極低層水 |
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| Research Abstract |
The purpose of this study is to make an analysis of our observational data in which the seasonal variability of volume transport for the northward flowing Antarctic Bottom Water in the Indian sector of the Antarctic could be successfully obtained for the first time. We have done the deployment of the current-mooring systems at 8 stations off the southeastern coast of the Kerguelen Plateau for two years from February 2003 to January 2005, as an international joint project together with CSIRO in Australia. Our primary data analyses have shown that this region has completely reverse current direction over the continental shelf slope and the far offshore; the former is northwestward flow while the latter is southeastward flow. Therefore, the water circulation system in this region is approximately composed of the northward flow as a western boundary current and southward flow due to the cyclonic recirculation.
In this study, we have also derived the sea-ice thickness distribution in the coastal polynyas where are the formation areas of the Antarctic Bottom Water, using the SSMI microwave data. From the data analyses and heat-budget calculation, we also have successfully made the mapping of the amount of sea-ice production in the coastal polynyas. According to our study, the area of the largest amount of sea-ice production in the Antarctic is Ross Sea. However, the amount of the sea-ice production in the coastal polynyas of the Ross Sea decreases about 30% during the period from 1990's to 2000's; this may lead to the recent trend of the freshening of the Antarctic Bottom Water.
Although we did not yet make all the data analyses, we will propose water circulation system in the Indian Ocean sector of the Antarctic quantitatively, in the nearfuture.
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Report
(4 results)
Research Products
(40 results)
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[Presentation] 宗谷暖流の短周期変動について2008
Author(s)
江淵直人, 深町康, 大島慶一郎, 若土正曉
Organizer
2008年度日本海洋学会春季大会
Place of Presentation
東京・東京海洋大学
Year and Date
2008-03-27
Description
「研究成果報告書概要(和文)」より
Related Report
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