| Project Area | Linkages in biogeochemical cycles between surface ocean and lower atmosphere |
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| Project/Area Number |
18067001
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
TSUNOGAI Urumu Hokkaido University, 大学院・理学研究院, 准教授 (50313367)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAGAWA Fumiko 北海道大学, 大学院・理学研究院, 助教 (70360899)
TANIMOTO Hiroshi 独立行政法人国立環境研究所, 大気圏環境研究領域・大気化学研究室, 室長 (30342736)
INOMATA SAtoshi 独立行政法人国立環境研究所, 大気圏環境研究領域・大気化学研究室, 主任研究員 (80270586)
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| Project Period (FY) |
2006 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥64,200,000 (Direct Cost: ¥64,200,000)
Fiscal Year 2010: ¥8,700,000 (Direct Cost: ¥8,700,000)
Fiscal Year 2009: ¥10,900,000 (Direct Cost: ¥10,900,000)
Fiscal Year 2008: ¥10,800,000 (Direct Cost: ¥10,800,000)
Fiscal Year 2007: ¥11,000,000 (Direct Cost: ¥11,000,000)
Fiscal Year 2006: ¥22,800,000 (Direct Cost: ¥22,800,000)
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| Keywords | 大気化学 / 海洋化学 / 生物地球化学 / 気候変動 / 微量気体 / PTR-MS / 同位体 / 窒素固定 / 同立体 / 大気-表層海洋相互作用 / QMS / VOCs / OVOCs / 炭素安定同位体比 / 気体質量分析計 |
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| Research Abstract |
We developed an equilibrator inlet-proton transfer reaction-mass spectrometry (EI-PTR-MS) system for high-resolution measurement of the concentrations of multiple volatile organic compounds (VOCs) dissolved in seawater. The equilibration of six VOCs (dimethyl sulfide (DMS), isoprene, propene, acetone, acetaldehyde, and methanol) between seawater samples and the carrier gas, and the response time of the system, were evaluated by means of a series of laboratory experiments. Although equilibrium between the seawater sample and the carrier gas in the equilibrator was not achieved for isoprene and propene (likely because of their low water solubility), the other species did reach equilibrium. The EI-PTR-MS system was deployed during a research cruise in the western North Pacific Ocean. Evaluation of several seawater sampling methods indicated that there was no significant contamination from the sampling apparatus for the target VOCs. For DMS and isoprene, comparison of EI-PTR-MS measurements with measurements obtained with a membrane equilibrator-gas chromatography/mass spectrometry system showed generally good agreement. EI-PTR-MS captured the temporal variations of dissolved VOCs, including small-scale variability, which demonstrates that the performance of the EI-PTR-MS system was sufficient for simultaneous and continuous measurements of multiple VOCs of environmental importance in seawater.
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