2013 Fiscal Year Final Research Report
Numerical study of warm water spreading from the Kuroshio front to a coastal water and fishing-ground formation of "shirasu" using a submesoscale ocean model
| Project/Area Number |
23740365
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Fisheries Research Agency |
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Principal Investigator |
KURODA Hiroshi 独立行政法人水産総合研究センター, 北海道区水産研究所, 研究員 (30531107)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 黒潮 / サブメソスケール変動 / 沿岸シラス漁場 / 高解像度海洋モデル / シラス輸送モデル |
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| Research Abstract |
Larva and juvenile of pelagic fishes (shirasu) are important targets of Japanese fisheries in coastal waters. The fishing-ground formation has been believed to be related to submesoscale variations such as the Kuroshio frontal disturbances, but details have been little elucidated. To understand the process/mechanism of the shirasu fishing-ground formation, we developed a realistic 1/50-degree submesoscale model connected to a 1/10-degree mesoscale model by using one-way nesting and SSDA method. This study clarified that typical large-scale warm water spreading from the offshore Kuroshio front can supply a large amount of the shirasu to coastal fishing grounds, but they are easily transported away from the coastal fishing grounds, which is associated with short-term fishing-ground formation. In contrast, more preferable long-term fishing-ground formation is expected when relatively weak warm water spreading occurs and the subsequent residence time of coastal water becomes longer.
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