HR: 0800h
AN: A11A-0010    [Abstracts]
TI: VOC Measurements in Mega-city Tokyo: Behaviors, Sources, and Photochemical Transformations
AU: * Koike, M
EM: koike@eps.s.u-tokyo.ac.jp
AF: Univ. of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-0033 Japan
AU: Kondo, Y
EM: kondo@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, Univ. of Tokyo, 4-6-1 Komaba, Meguro, Tokyo, 153-8904 Japan
AU: Yokouchi, Y
EM: yokouchi@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Tsukuba, 305-8506 Japan
AU: Takegawa, N
EM: takegawa@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, Univ. of Tokyo, 4-6-1 Komaba, Meguro, Tokyo, 153-8904 Japan
AU: Komazaki, Y
EM: komazaki@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, Univ. of Tokyo, 4-6-1 Komaba, Meguro, Tokyo, 153-8904 Japan
AU: Miyazaki, Y
EM: yuzom@atmos.rcast.u-tokyo.ac.jp
AF: Research Center for Advanced Science and Technology, Univ. of Tokyo, 4-6-1 Komaba, Meguro, Tokyo, 153-8904 Japan
AB: Volatile organic compounds (VOCs) play important role as precursors for formation of ozone and organic secondary aerosols. In urban regions, VOCs are emitted in large quantities from a wide variety of anthropogenic sources. To characterize behaviors of VOCs in mega-city Tokyo, Japan, we have made measurements of VOCs and oxygenated VOCs using a proton-transfer-reaction mass spectrometry (PTR-MS) technique since April 2003. A positive correlation with CO was generally observed for various VOCs and OVOCs through a year. High concentrations were generally observed under calm wind conditions likely due to accumulation effect. In some cases, enhancements in benzene and toluene concentrations were observed without a corresponding increase in CO. They were observed for particular wind directions. Evaporation of gasoline (refuel loss) and solvent are probably responsible for these enhancements. Diurnal variation with a maximum around noon was observed for acetaldehyde. It was especially evident after removing contributions from primary emissions using CO and it positively correlated with O3.
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting