| Project/Area Number |
13480156
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Graduate School of Environmental Studies, Nagoya university |
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Principal Investigator |
MASUZAWA Toshiyuki (2003) Nagoya University, Graduate School of Environmental Studies, Professor, 大学院・環境学研究科, 教授 (40023858)
田中 浩 (2001-2002) 名古屋大学, 大学院・環境学研究科, 教授 (00115594)
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| Co-Investigator(Kenkyū-buntansha) |
KOGA Seizi National institute of Advanced Industrial Science and Technology, Institute for Environmental Management Technology, Senior researcher, つくば西事業所・環境管理研究部門, 主任研究員 (70356971)
NAGAO Ippei Nagoya University, Graduate School of Environmental Studies, Assistant Professor, 大学院・環境学研究科, 助手 (00252297)
ISHIZAKA Yutaka Hydrospheric Atmospheric Research Center, Associate Professor, 地球水循環研究センター, 助教授 (50022710)
増澤 敏行 名古屋大学, 大学院・環境学研究科, 教授 (40023858)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥9,000,000 (Direct Cost: ¥9,000,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2002: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2001: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Keywords | dimethyl sulfide / sulfur compounds / marine phytoplankton / sulfur cycle / marine biosphere and atmospheric aerosol / 硫化ジメチル(DMS) |
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| Research Abstract |
With support of this grant-in-aid, we performed following terms ; (1) development of automatic measurement system of atmospheric DMS, (2) measurement of DMS in the seawater and atmosphere over the western North Pacific in spring and winter, (3) setting up an observation station at Hachijojima Island to obtain time series of atmospheric DMS. In addition, analysis of transport pathway of air parcel by an isentropic trajectory Analysis was also performed, and we analyzed aerosol chemical compositions to detect the Kosa particle and oxidation products of DMS in the marine air. Moreover to obtain the distribution of chlorophyll-a in this area, remote sensing chlorophyll-a data derived from SeaWiPs satellite was analyzed.
Sea-air DMS flux was estimated with DMS concentrations in the surface seawater and atmosphere, SST and surface wind speed. Relationship between sea-air DMS flux and atmospheric DMS abundance was analyzed.
As a result of analysis, seawater DMS in spring was higher than in December by a factor of 1.5〜2 in this area. Chlorophyll-a concentration derived from SeaWiES was also higher in April than in December. These results were due to an increase of marine production in spring. In addition, high MSA and non sea-salt sulfate concentrations in aerosol were observed when air parcel was transported from the elevated chlorophyll-a area within 1〜2 days. According to column model approach, these elevated concentrations in aerosol were mainly due to the, high emission of DMS in the elevated chlorophyll-a area and rapid oxidation of DMS under the high ozone condition. Although Kosa events were observed in these observations, we did not succeed getting enough data to show any sign of impact of Kosa on marine production.
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