| Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2020: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
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| Outline of Final Research Achievements |
In the sub-surface layer of the eastern Indian Ocean, high-resolution vertical observations of environmental parameters related to nitrogen cycling and on board incubation experiments using in-situ plankton communities were conducted. The results showed that iron was the most important trace metals regulating nitrogen cycling around the primary nitrite maximum layer, and that light availability also had additional effects on microbial nitrification and phytoplankton nitrogen metabolism. In particular, light or iron deficiency in the Bay of Bengal, and light deficiency in the equatorial region were inferred to promote the release of nitrite from phytoplankton. It was also suggested that the regulation of ammonia oxidation by light intensity and nitrite oxidation by dissolved iron concentration in the equatorial region.
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