| Project Area | Linkages in biogeochemical cycles between surface ocean and lower atmosphere |
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| Project/Area Number |
18067004
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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 |
YAMANAKA Yasuhiro Hokkaido University, 大学院・地球環境科学研究院, 教授 (40242177)
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| Co-Investigator(Kenkyū-buntansha) |
ONIZUKA Goh 独立行政法人水産総合研究センター, 中央水産研究所, 研究員 (40399647)
鵜野 伊津志 九州大学, 応用力学研究所, 教授 (70142099)
相田 真希 独立行政法人海洋研究開発機構, 地球環境フロンティア研究センター, 技術研究副主任 (90463091)
河宮 未知生 独立行政法人海洋研究開発機構, 地球環境フロンティア研究センター, グループリーダー (10399579)
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| Co-Investigator(Renkei-kenkyūsha) |
AITA N.Maki 独立行政法人海洋研究開発機構, 地球環境変動領域, 技術研究副主任 (90463091)
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| Project Period (FY) |
2006 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥51,100,000 (Direct Cost: ¥51,100,000)
Fiscal Year 2010: ¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2009: ¥9,800,000 (Direct Cost: ¥9,800,000)
Fiscal Year 2008: ¥10,800,000 (Direct Cost: ¥10,800,000)
Fiscal Year 2007: ¥10,700,000 (Direct Cost: ¥10,700,000)
Fiscal Year 2006: ¥10,600,000 (Direct Cost: ¥10,600,000)
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| Keywords | 海洋生態系 / 台風 / モデリング / 物質循環 / 気候変動 / 大気海洋相互作用 / 気象現象 / 亜熱帯 / 海洋生態系モデル / 鉄循環 / SOLAS / 対流圏物質輸送モデル / ダスト / NOx / 春季ブルーム |
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| Research Abstract |
In the western subtropical North Pacific, we investigated the response of phytoplankton to typhoon passage using a numerical model. We found the observed patch-like phytoplankton bloom was reproduced for slow-moving typhoons. The strong bloom is caused by the typhoon-centered upwelling of nutrient-rich water from below the euphotic layer, which supplies the nutrients required for phytoplankton growth, resulting in higher chl-a concentrations. Biogeochemical processes then play essential roles in determining the response after the passage of typhoons in subtropical regions, by comparing experiments with/without biogeochemical processes in the model.
We also improvement a marine ecosystem model introducing iron cycle with iron supplies by the atmospheric dust transport and remineralization on the continental shelf etc. This improved surface distribution of nutrient and chlorophyll-a concentrations on the global scale, especially in the high nutrient and low chlorophyll-a regions such as the subarctic North Pacific due to biological production limited by iron concentration.
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