| Project/Area Number |
23651017
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Nagasaki University |
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Principal Investigator |
TAKEDA Shigenobu 長崎大学, 水産・環境科学総合研究科, 教授 (20334328)
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| Co-Investigator(Renkei-kenkyūsha) |
WADA Minoru 長崎大学, 水産・環境科学総合研究科, 准教授 (70292860)
UMEZAWA Yu 長崎大学, 水産・環境科学総合研究科, 准教授 (50442538)
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 海洋科学 / 海洋生態 / 化学海洋 / 窒素循環 / 鉄 / 地球化学 / 植物プランクトン / 亜硝酸塩 / 海洋亜表層 |
|---|
| Research Abstract |
As a mechanism for the formation of the subsurface nitrite maximum (SNM), a hypothesis that iron limitation stimulates nitrite release from phytoplankton cells to the surrounding water, was examined in the oceanic waters, by measuring detailed distributions of iron and nutrients near the subsurface chlorophyll maximum layer. Although phytoplankton assemblage in the East China Sea was not under iron-limitation, extremely low concentration of dissolved iron observed near the SNMseems to support the hypothesis in the western North Pacific. In the subarctic waters of the North Pacific, however, archaeal ammonia oxidation may also contribute to the formation of the SNM, because of the high ambient ammonium concentrations
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