| Project/Area Number |
14208061
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | The University of Tokyo |
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Principal Investigator |
KONDO Yutaka The University of Tokyo, Research Center for Advanced Science and Technology, Professor, 先端科学技術研究センター, 教授 (20110752)
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| Co-Investigator(Kenkyū-buntansha) |
KAJII Yoshizumi Tokyo Metropolitan University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (40211156)
KOIKE Makoto The University of Tokyo, School of Science, Associate Professor, 大学院・理学系研究科, 助教授 (00225343)
KITA Kazuyuki Ibaraki University, Faculty of Science, Associate Professor, 理学部, 助教授 (30221914)
TAKEGAWA Nobuyuki The University of Tokyo, Research Center for Advanced Science and Technology, Associate Professor, 先端科学技術研究センター, 助教授 (00324369)
HIROKAWA Jun Hokkaido University, Graduate School of Environmental Earth Science, Associate Professor, 大学院・地球環境科学研究科, 助教授 (20262115)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥52,520,000 (Direct Cost: ¥40,400,000、Indirect Cost: ¥12,120,000)
Fiscal Year 2004: ¥14,560,000 (Direct Cost: ¥11,200,000、Indirect Cost: ¥3,360,000)
Fiscal Year 2003: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2002: ¥21,320,000 (Direct Cost: ¥16,400,000、Indirect Cost: ¥4,920,000)
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| Keywords | mega-city / ozone / CO / NOx / NOy / nitric acid / aerosol / 3D-Chemistry-Transport Model / Noy / Nox NOy / 硝酸イオン / 分光光度放射計 / 3次元モデル / NOx NOy / PTR-MS / 航空機観測 |
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| Research Abstract |
We have developed instruments for precise measurements of ozone precursors (NOx,HNO_3,PAN,VOCs, and CO), OH and HO_2 radicals, and actinic flux. Measurement campaigns using these instruments were conducted in different seasons in 2003-2005. Especially, in July-August 2004, intensive measurements were made at two sites ; one in Tokyo and the other in Kisai-city in Saitama. At the same time, aerosol chemical composition at each size range was measured using an Aerodyne Aerosol Mass Spectrometer. Air mass which left Tokyo reaches Saitama in the afternoon, providing ideal conditions for investigationg chemical processes during transport. In mid-August, sea-land breeze developed under the influence of stable high pressure system. Under these conditions, O_3 reached high levels in northern Tokyo around 1300 LT. This O_3 levels further increased while the air mass was transported to Saitama by sea breeze. During the transport, NOx oxidation and O_3 formation occurred simultaneously. Organic aerosol was observed to be formed efficiently under high O_3 conditions. 3D-CTM has been developed taking into account the chemical and transport processes. This model well reproduces O_3 and precursors in Kanto area. By this model, it is indicated that O_3 was produced within a few hours near noon.
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