| Project/Area Number |
11680539
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | National Institute of Polar Research |
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Principal Investigator |
AZUMA Kumiko Natiomal Institute of Polar Research, Associate Professor, 研究系, 助教授 (80202620)
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| Co-Investigator(Kenkyū-buntansha) |
MATOBA Sumito Natiomal Institute of Polar Research,COE Researcher, 研究系, COE研究員
MATOYAMA Hideaki Natiomal Institute of Polar Research,Associate Professor, 研究系, 助教授 (20210099)
FUJII Yoshiyuki Natiomal Institute of Polar Research,Professor, 北極圏環境研究センター, 教授 (20125214)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2001: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Ice core / Arctic / Air pollutants / long-ramge transport |
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| Research Abstract |
Ice core studies have shown that sulfate and nitrate concentrations in Arctic snow have increased significantly since the end of the 19th century due to the influx of anthropogenic pollutants transported from industrialized regions. Trends of increasing sulfate and nitrate concentrations in snow are evident in all the ice core data from Greenland, the Canadian Arctic, and Svalbard. Temporal patterns, however, show spatial variation. The difference between the magnitude and timing of increasing trends of the sulfate ions at different Arctic sites can be attributed to their having different source regions and pathways for these pollutant ions. The pollutant sources appear to be North America for south Greenland, Devon Island and Baffin Island, Eurasia, for Ellesmere Island and Svalbard, and both North America and Eurasia for central and north Greenland. An ice core from Svalbard showed significant decreases of both sulfate and nitrate concentrations since the 1970s. These decreases could be partly attributed to the strict pollution control started in the 1970s, but they are also partly due to the changes in atmospheric circulation dominated by the North Atlantic Oscillation.
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