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Aerial Observation of Atmospheric Nanoparticles in Fukue Island, Japan

Category: Aerosol and Atmospheric Chemistry

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DOI: 10.4209/aaqr.2018.03.0077
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Kwangyul Lee1, Indra Chandra1,3, Takafumi Seto1, Yayoi Inomata 1,2, Masahiko Hayashi4, Akinori Takami5, Ayako Yoshino5, Yoshio Otani1

  • 1 Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan
  • 2 Institute of Nature and Environmental Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan
  • 3 Engineering Physics, School of Electrical Engineering, Telkom University, Bandung, Jawa Barat 40257, Indonesia
  • 4 Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka 814-0180, Japan
  • 5 Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan

Highlights

Vertical profile of atmospheric nanoparticle was observed at rural area in East Asia.
Increase of nanoparticle number concentration was found at 400 m.
Long range transport of air pollutants from Asian continent was observed.
Highly aged sulfates were observed during long range transport at April 15–16.


Abstract

New particle formation (NPF) in the East Asia region is strongly influenced by the photochemical processes during long-range transport of air pollutants. Our previous measurements (Chandra et al., 2016; Seto et al., 2013) related to the incomplete and weak NPF (onset diameter above 10 nm) at Fukue Island in Japan (downstream from the Asian continent) suggested nucleation in the upstream region. The vertical structure of atmospheric nanoparticle concentration (particle size > 6 nm and altitude < 1.2 km) during NPF was observed using a Kite-Plane at Fukue Island. Three different event types were identified through aerial observations (different vertical profiles of nanoparticles), ground-based measurements (initial detected diameter of nanoparticles, NPF starting time, and dominant chemical component in PM1), and air mass backward trajectory analysis. A stronger NPF event (Event I: > 35,000 particles cm-3) than in our previous measurements (from 2012 to 2016, ~20,000 particles cm-3) with a particle size as small as 5 nm, affected by long-range transport of air pollutants under a high-pressure system, was detected. A sudden increase of particle number and SO2 concentrations with weak NPF caused by a change of air mass origin (Event II: < 10,000 particles cm-3) as well as no NPF with aged sulfate particles under low particle number concentration and SO2 conditions (< 0.15 ppb) (Event III: < 2,000 particles cm-3) were also observed.

Keywords

New particle formation Vertical structure Trans-boundary transport East Asia


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