Observational study to quantitatively clarify bottom current passing through Main Gap of the Emperor Seamount Chain
| Project/Area Number |
15K05283
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Research Collaborator |
MIYAMOTO Masatoshi 東京大学, 理学系研究科, 大学院学生
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2015: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
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| Keywords | 海洋深層循環 / 北太平洋 / 底層水 / 船舶観測 / 係留観測 / 測流 / 北太平洋深層循環 / 天皇海山列メインギャップ / 深層流 / 深層水 / 直接流速観測 / 深層循環 / 天皇海山列 / 通過流量 / 地衡流流速 |
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| Outline of Final Research Achievements |
Bottom current was directly measured by ADCP lowered from ship and a current-meter mooring system at Main Gap, which is the widest, deepest gap at 39N-40N in the Emperor Seamount Chain dividing the deep layer of the North Pacific into the east and west basins. As the result, we obtained a snapshot of horizontal distribution of bottom current, which is weak in the northern part of the gap while eastward current is strong enough to exceed 20 cm/s in the southern part. One-year average of current velocity directed eastward also at the mooring site in the northern part. In total, the bottom water flows eastward through the gap. Water characteristics did not indicate that the bottom water is Lower Circumpolar Deep Water (LCDW) originating from the Southern Ocean. We obtained a new image of the deep ocean circulation where LCDW may be strongly modified in the Northwest Pacific Basin and may flow into the Northeast Pacific Basin through Main Gap.
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Report
(4 results)
Research Products
(6 results)
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[Presentation] Mooring and turbulence observations around the Emperor seamounts and gaps2017
Author(s)
Daigo Yanagimoto, Takahiro Tanaka, Ichiro Yasuda, Yasutaka Goto, Masatoshi Miyamoto, Masaaki Kikuchi, Eitarou Oka, Yasushi Takatsuki, Toshiya Nakano
Organizer
International Symposium “Ocean Mixing Processes: Impact on Biogeochemistry, Climate and Ecosystem”
Place of Presentation
Sanjo Conference Hall, The University of Tokyo (Hongo Campus), Bunkyo, Tokyo
Year and Date
2017-03-16
Related Report
Int'l Joint Research
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