Analysis of summertime atmospheric transport of fine particulate matter in Northeast Asia

Hikari Shimadera, Hiroshi Hayami, Yu Morino, Toshimasa Ohara, Satoru Chatani, Shuichi Hasegawa, Naoki Kaneyasu

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

In Northeast Asia, the effect of long-range transport of air pollutants is generally pronounced in spring and winter, but can be important even in summer. This study analyzed summer-time atmospheric transport of elemental carbon (EC) and sulfate (SO4 2-) with the Community Multiscale Air Quality (CMAQ) model driven by the Weather Research and Forecasting (WRF) model. The WRF/CMAQ modeling system was applied to regions ranging from Northeast Asia to the Greater Tokyo Area in Japan in summer 2007. In terms of EC, while the model simulated well the effect of long-range transport, the simulation results indicated that domestic emissions in Japan dominantly contributed (85%) to EC concentrations in the Greater Tokyo. In terms of SO4 2-, the simulation results indicated that both domestic emissions (62%) and long-range transport from the other countries (38%) substantially contributed to SO4 2- concentrations in the Greater Tokyo. Distinctive transport processes of SO4 2- were associated with typical summer-time meteorological conditions in the study region. When a Pacific high-pressure system covered the main island of Japan, domestic emissions, including volcanic emission, dominantly contributed to SO4 2- concentrations in the Greater Tokyo. When a high-pressure system prevailed over the East China Sea and low-pressure systems passed north of Japan, synoptic westerly winds associated with this pressure pattern transported a large amount of SO4 2- from the continent to Japan. In addition, although heavy precipitation and strong wind decreased SO4 2- concentrations near the center of a typhoon, peripheral typhoon winds occasionally played an important role in long-range transport of SO 4 2-.

Original languageEnglish
Pages (from-to)347-360
Number of pages14
JournalAsia-Pacific Journal of Atmospheric Sciences
Volume49
Issue number3
DOIs
Publication statusPublished - 2013 May
Externally publishedYes

Keywords

  • air quality model
  • elemental carbon
  • Long-range transport
  • PM
  • sulfate

ASJC Scopus subject areas

  • Atmospheric Science

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