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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 한국기상학회 2013 Asia-Pacific Journal of Atmospheric Sciences Vol.49 No.3
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 (SO42−) 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 SO42−, the simulation results indicated that both domestic emissions (62%) and long-range transport from the other countries (38%) substantially contributed to SO42− concentrations in the Greater Tokyo. Distinctive transport processes of SO42− 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 SO42− concentrations in the Greater Tokyo. When a high-pressure system prevailed over the East China Sea and lowpressure systems passed north of Japan, synoptic westerly winds associated with this pressure pattern transported a large amount of SO42− from the continent to Japan. In addition, although heavy precipitation and strong wind decreased SO42− concentrations near the center of a typhoon, peripheral typhoon winds occasionally played an important role in long-range transport of SO42−.
Lu Yang,Ning Tang,Atsushi Matsuki,Akinori Takami,Shiro Hatakeyama,Naoki Kaneyasu,Edward G. Nagato,Kei Sato,Ayako Yoshino,Kazuichi Hayakawa 한국대기환경학회 2018 Asian Journal of Atmospheric Environment (AJAE) Vol.12 No.4
This is the first comparative study to examine two different background monitoring sites in Japan to compare differences in the concentration and composition of long-range-transported polycyclic aromatic hydrocarbons (PAHs) from the Asian continent. This study chose the Noto Peninsula (the Kanazawa University Wajima Air Monitoring Station; WAMS) and Fukue Island (the Fukue-jima Atmosphere and Aerosol Monitoring Station; FAMS) to compare 10 weekly periods in 2009 and 2010 from autumn to spring, seasons that are strongly influenced by the Asian continent. The PAHs concentration differed significantly for most periods at these two sites. The backward trajectory analysis found that the low height of the air mass may cause the low concentration and the similar air mass condition could result in the similar concentration. The concentration of long-range-transported PAHs depended more on the source of the coal combustion areas such as Northeast China in heating period.