2010 Fiscal Year Final Research Report
Mechanism on abrupt change of primary productivity by air-sea interaction using satellite remote sensing and numerical modeling
| Project Area | Linkages in biogeochemical cycles between surface ocean and lower atmosphere |
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| Project/Area Number |
18067003
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
SAITOH Sei-ichi Hokkaido University, 大学院・水産科学研究院, 教授 (70250503)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIZAKA Joji 名古屋大学, 地球水循環研究センター, 教授 (40304969)
NIINO Hiroshi 東京大学, 海洋研究所, 教授 (90272525)
TORATANI Mitsuhiro 東海大学, 開発工学部, 准教授 (90246075)
MORIOMTO Akihiko 名古屋大学, 地球水循環研究センター, 准教授 (80301323)
HIRAWAKE Toru 北海道大学, 大学院・水産科学研究院, 准教授 (70311165)
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| Project Period (FY) |
2006 – 2010
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| Keywords | 衛星観測 / 突発的現象 / 台風 / 植物プランクトン / 数値モデル / 光学的特性 |
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| Research Abstract |
Using satellite data set on ocean color and sea surface temperature before and after typhoon passing around Japan, we examined statistically abrupt change of primary productivity. The constructed relationship requires variables of typhoon maximum sustained wind, typhoon transit speed and bottom depth of the location below the typhoon track. Typhoon-forced primary production enhancements and typhoon contributions to summer-fall new production during El Nino years tended to be higher than those during La Nina years. We developed a numerical model of typhoon which can simulate a magnitude of mixing and upwelling in sub-surface layer and examined the upper-oceanic response to a moving typhoon and the mechanism of the response. We investigated the movement of the Kuroshio axis and the change of primary production on the northeast shelf of Taiwan associated with the passage of typhoons, using sea surface current data observed by ocean radar system.
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[Journal Article] A phytoplankton absorption-based primary productivity model for remote sensing in the Southern Ocean2011
Author(s)
Hirawake, T., Takao, S., Horimoto, N., Ishimaru, T., Yamaguchi, Y., Fukuchi, M.
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Journal Title
Polar Biology 34
Pages: 291-302
Peer Reviewed
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[Presentation] Size structure of phytoplankton and optical properties in the Arctic Ocean in autumn2010
Author(s)
Hirawake, T., Matsumoto, K., Shinmyo, K., Fujiwara, A., Saitoh, S.-I.
Organizer
Ocean Optics XX
Place of Presentation
Anchorage, U.S.A.
Year and Date
20100927-20101001
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