2010 Fiscal Year Final Research Report
Responses of marine ecosystem to weather disturbances of synoptic scale
| 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)
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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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| 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 |
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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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[Journal Article] Synoptic relationships quantified between surface Chlorophyll-a and diagnostic pigments specific to phytoplankton functional types.2011
Author(s)
T.Hirata, N.Hardman-Mountford, R.Brewin, J.Aiken, R.Barlow, K.Suzuki, T.Isada, E.Howell, T.Hashioka, M.Noguchi-Aita, Y.Yamanka
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Journal Title
Biogeosciences 8
Pages: 311-327
Peer Reviewed
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[Remarks] ホームページ等 なし
