HR: 0800h
AN: A41A-0011    [Abstracts]
TI: Measurements of Submicron Aerosols in Tokyo using the Aerodyne Aerosol Mass Spectrometer (AMS)
AU: * Takegawa, N
EM: takegawa@atmos.rcast.u-tokyo.ac.jp
AF: University of Tokyo, 4-6-1 Komaba, Tokyo, 153-8904 Japan
AU: Kondo, Y
EM: kondo@atmos.rcast.u-tokyo.ac.jp
AF: University of Tokyo, 4-6-1 Komaba, Tokyo, 153-8904 Japan
AU: Miyakawa, T
EM: miyakawa@atmos.rcast.u-tokyo.ac.jp
AF: University of Tokyo, 4-6-1 Komaba, Tokyo, 153-8904 Japan
AU: Komazaki, Y
EM: komazaki@atmos.rcast.u-tokyo.ac.jp
AF: University of Tokyo, 4-6-1 Komaba, Tokyo, 153-8904 Japan
AU: Miyazaki, Y
EM: yuzom@atmos.rcast.u-tokyo.ac.jp
AF: University of Tokyo, 4-6-1 Komaba, Tokyo, 153-8904 Japan
AU: Jimenez, J L
EM: jose.jimenez@colorado.edu
AF: University of Colorado, UCB 216, Boulder, CO 80309 United States
AU: Jayne, J T
EM: jayne@aerodyne.com
AF: Aerodyne Research, Inc., 45 Manning Road, Billerica, MA 01821-3976 United States
AU: Worsnop, D R
EM: worsnop@aerodyne.com
AF: Aerodyne Research, Inc., 45 Manning Road, Billerica, MA 01821-3976 United States
AB: We have conducted ground-based measurements of submicron aerosols in Tokyo using the Aerodyne Aerosol Mass Spectrometer (AMS) since February 2003. Size-resolved chemical composition of non-refractory aerosol (vaporized at 600C under high vacuum) was measured with a time resolution of 10 minutes. The mass concentrations of inorganic species (nitrate, sulfate, chloride, and ammonium) measured by the AMS showed good agreement with those measured by a Particle-Into-Liquid Sampler combined with an Ion Chromatography analyzer (PILS-IC). The mass concentrations of organic compounds measured by the AMS correlated well with organic carbon (OC) mass measured by a Sunset Lab semi-continuous thermal-optical carbon analyzer. The ratio of AMS organics to OC was consistent with the organic matter (OM) to OC ratios that were previously reported by other studies. The correlation of AMS organics with carbon monoxide (CO) and the intensity of a marker peak (m/z 44) were used to estimate the mass concentrations of secondary organic aerosols (SOA). The estimated SOA concentrations showed distinct diurnal variation and correlated with ozone in daytime.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
DE: 0355 Thermosphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting