HR: 0800h
AN: A51C-0075    [Abstracts]
TI: Oxidation of Reactive Nitrogen and Ozone Production in Tokyo
AU: * Fukuda, M
EM: fukuda@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, JAPAN, Meguro, 153-8904 Japan
AU: Kondo, Y
EM: kondo@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, JAPAN, Meguro, 153-8904 Japan
AU: Miyazaki, Y
EM: yuzom@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, JAPAN, Meguro, 153-8904 Japan
AU: Morino, Y
EM: morino@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, JAPAN, Meguro, 153-8904 Japan
AU: Takegawa, N
EM: takegawa@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, JAPAN, Meguro, 153-8904 Japan
AU: Miyakawa, T
EM: miyakawa@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, JAPAN, Meguro, 153-8904 Japan
AU: Komazaki, Y
EM: komazaki@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, JAPAN, Meguro, 153-8904 Japan
AU: Tanimoto, H
EM: tanimoto@nies.go.jp
AF: Atmospheric Environment Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, JAPAN, Tsukuba, 305-8506 Japan
AU: Yokouchi, Y
EM: yokouchi@nies.go.jp
AF: Atmospheric Environment Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, JAPAN, Tsukuba, 305-8506 Japan
AU: Kanaya, Y
EM: yugo@jamstec.go.jp
AF: Frontier Research Center for Global Change, Japan Agency Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, JAPAN, Yokohama, 236-0011 Japan
AU: McKenzie, R
EM: r.mckenzie@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Lauder, Private Bag 50061, Omakau Central Otago, 9182 New Zealand, Otago, 1701 New Zealand
AU: Johnston, P
EM: p.johnston@niwa.cri.nz
AF: National Institute of Water and Atmospheric Research, Lauder, Private Bag 50061, Omakau Central Otago, 9182 New Zealand, Otago, 1701 New Zealand
AB: Ground based measurements of NOx (NO + NO2), nitric acid (HNO3), particulate nitrate (NO3-), peroxyacyl nitrates (PANs), and total reactive nitrogen (NOy) were conducted in Tokyo in winter (January-February 2004), summer (July-August 2003 and 2004), and fall (October 2003). Carbon monoxide (CO), ozone (O3), non-methane hydrocarbons (NMHCs) and actinic flux were also measured during these periods. Average mixing ratios of these species and the NOx/NOy, HNO3/NOy, NO3-/NOy, and PANs/NOy ratios showed distinct diurnal-seasonal variations. The NOx/NOy ratios were 0.63-0.95 on high J(O1D) days, and 0.77-0.94 on low J(O1D) days. In summer and winter, total nitrate (TN = HNO3 + NO3-) was the dominant form of the NOx oxidation products (NOz = NOy - NOx) during the daytime on high J(O1D) days, and PANs were minor component species. The partitioning of TN was controlled mainly by temperature and the shit of the partitioning to NO3- at low temperature suppressed removal of NOy by dry deposition of HNO3. Removal rate of NOy is estimated using CO as a tracer. The estimated loss of NOy (LNOy) was largest during the daytime in summer (35%), while smallest (0%) in winter. The corrected ozone production efficiency (OPEx), which is defined as the linear regression slope of the observed Ox (= O3 + NO2) versus NOz* (= NOz + LNOy), is estimated to be 2.5. The estimated OPEx is slightly lower than those obtained in the U.S. urban air, which is probably due to lower ratios of NMHCs to NOx in this study. Possible factors controlling the OPEx will be discussed in detail.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005