Sources of high sulfate aerosol concentration observed at cape hedo in spring 2012

Syuichi Itahashi, Shiro Hatakeyama, Kojiro Shimada, Akinori Takami

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Intensive observation campaigns approximately 1 week long were conducted periodically from March 2010 to November 2015 at Cape Hedo, Okinawa, Japan. The maximum daily mean sulfate aerosol (SO 4 2– ) concentrations surpassed 15 µg m –3 in spring 2012. In this study, source apportionment for these high concentrations was conducted using an air quality model with the tagged tracer method, and the main source was identified as volcanoes in March and as anthropogenic emissions from China in April. In March, the prevailing northerly wind transported a volcanic SO 2 plume with a low conversion ratio to Cape Hedo. The impacts of 15 volcanoes in Japan were estimated, and a substantial impact from Sakurajima, which accounted for more SO 2 than anthropogenic emissions from Japan, was found. Because the model had difficulty capturing the highest concentration, three sensitivity simulations were performed to consider the uncertainty of the volcanic SO 2 emission amounts and injection heights, revealing the importance of the injection height in addition to the SO 2 emission amount. Throughout April, contributions from anthropogenic emissions from China were found; hence, this source was further divided into 31 provincial scales. Shandong and Jiangsu Provinces, which are the first and seventh largest emission sources in China, respectively, were identified as significant sources at Cape Hedo. These sources showed day-to-day variation in their contributions, and the highest contribution from Shandong Province occurred on April 23, whereas that from Jiangsu Province occurred on April 22.

Original languageEnglish
Pages (from-to)587-600
Number of pages14
JournalAerosol and Air Quality Research
Volume19
Issue number3
DOIs
Publication statusPublished - 2019 Mar 1

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Volcanoes
Aerosols
Sulfates
aerosol
sulfate
Air quality
volcano
air quality
plume
tracer
simulation
province
Uncertainty

Keywords

  • Air quality model
  • Cape Hedo Atmosphere and Aerosol Monitoring Station (CHAAMS)
  • East Asia
  • Source apportionment
  • Tagged tracer method

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

Cite this

Sources of high sulfate aerosol concentration observed at cape hedo in spring 2012. / Itahashi, Syuichi; Hatakeyama, Shiro; Shimada, Kojiro; Takami, Akinori.

In: Aerosol and Air Quality Research, Vol. 19, No. 3, 01.03.2019, p. 587-600.

Research output: Contribution to journalArticle

Itahashi, Syuichi ; Hatakeyama, Shiro ; Shimada, Kojiro ; Takami, Akinori. / Sources of high sulfate aerosol concentration observed at cape hedo in spring 2012. In: Aerosol and Air Quality Research. 2019 ; Vol. 19, No. 3. pp. 587-600.
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