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Emission Regulations Altered the Concentrations, Origin, and Formation of Carbonaceous Aerosols in the Tokyo Metropolitan Area

Category: Aerosol and Atmospheric Chemistry

Volume: 16 | Issue: 7 | Pages: 1603-1614
DOI: 10.4209/aaqr.2015.11.0624
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Takuma Miyakawa 1,2, Yugo Kanaya1,2, Yuichi Komazaki1, Takao Miyoshi3, Hideki Nara3, Akinori Takami3, Nobuhiro Moteki4, Makoto Koike4, Yutaka Kondo4,5

  • 1 Department of Environmental Geochemical Cycle Research, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Japan
  • 2 Institute of Arctic Climate and Environment Research, Japan Agency for Marine-Earth Science and Technology, 3173-25, Showa-machi, Kanazawa-ku, Yokohama-city, Kanagawa 236-0001, Japan
  • 3 Center for Regional Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba-city, Ibaraki 305-8506, Japan
  • 4 Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8654, Japan
  • 5 National Institute of Polar Research, 10-3, Midori-cho, Tachikawa-city, Tokyo 190-8518, Japan

Highlights

Effect of the emission regulations in the Tokyo was investigated.
EC mass concentrations in summer decreased by 75% from 2004 to 2014.
Origin and formation processes of OC were significantly changed from 2004 to 2014.


Abstract

To investigate the effects of the regulations of diesel and non-methane hydrocarbon (NMHCs) emissions in the Tokyo metropolitan area (TMA) on the characteristics of carbonaceous aerosols (organic carbon (OC) and elemental carbon (EC)), we conducted field observations to characterize carbonaceous aerosols in the TMA in the summer of 2004 and 2014 (the end of July–middle of August). Following the enforcement of diesel emission regulations, EC concentrations showed a four-fold decrease from 2004 to 2014. However, OC concentrations showed no significant decrease in the last decade. Multiple chemical analyses revealed the differences in the impacts of the contribution of oxygenated fraction, biogenic NMHCs on OC, and the secondary organic aerosol–Ozone relationship between 2004 and 2014. Further investigations into the emission inventory for recent years, especially in terms of precursor gases, are needed for better prediction of OC in the TMA using chemical transport models.

Keywords

Emission regulations Carbonaceous aerosols SOA Biogenic carbons


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