| Budget Amount *help |
¥22,750,000 (Direct Cost: ¥17,500,000、Indirect Cost: ¥5,250,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2017: ¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
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| Outline of Final Research Achievements |
The possibility that nitrogen, essential for marine life, is declining in response to global warming has been discussed. This study investigated changes in the ocean nitrogen budget associated with global warming using nitrogen isotope ratio measurements of reef-building coral skeletons. The results showed that the amount of nitrogen in the ocean surface layer tends to decrease with warming by comparing the world's largest nitrogen-fixing oceans, the Caribbean Sea in the North Atlantic, Hawaii in the Central Pacific, and Oman, which faces the Arabian Sea. In addition, the supply of deep to the surface water with decadal to multi-decadal oscillations in water temperature is suggested to be an essential source of nitrogen and phosphorus in tropical and subtropical regions.
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