| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
The triple oxygen isotopic compositions of oceanic nitrate can be an useful tracer to quantify the mixing ratios of depositional nitrate within total nitrate in a water mass, because atmospheric nitrate shows large 17O anomaly due to the contribution of atmospheric ozone having large anomaly, whereas re-mineralized nitrate produced biologically shows little 17O anomaly. Determination on the triple oxygen isotopic compositions of nitrate allows us to estimate the mixing ratios of depositional nitrate within total nitrate.
To determine oxygen isotopic compositions of nitrate, nitrate must be reduced to nitrous oxide following to nitrite. Using Cu-coated Cd for reduction to nitrite allow us to save analytical time. We developed new automated analytical system for oxygen isotopic compositions of nitrate at Tokai university. We started to analyze stable isotopic compositions of oceanic nitrate during KH-14-6 of GEOTRACES cruise.
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