| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2014: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
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| Outline of Final Research Achievements |
Nitrogen is the limiting nutrients to phytoplankton production in the surface We have investigated supply process of dissolved inorganic nitrogen (DIN) to the surface layer of the Arctic Ocean. A fixed point observation for two weeks revealed that DIN concentration is very low, even in nano-molar level. Temporal events such as a passing of an eddy could bring some trace of DIN to promote local primary production during summer/autumn.
Year-round observations in the central Canada Basin using moored water sampler and sensors showed that DIN is low throughout a year, even during the mid-winter, probably due to very strong stratification which limits entrainment of deeper nutrient rich water to surface layer. Nevertheless, fluorescence data showed a peak at the beginning of Spring. At the moment, it is not clear what is the source of nitrogen supporting this production.
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