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S. Hatakeyama,Y. Takiguchi,A. Takami,W. Wang 한국대기환경학회 2007 한국대기환경학회 학술대회논문집 Vol.- No.-
Comprehensive measurements of chemical, physical, and radiative properties of aerosols have been made at a new Japanese super site for aerosol measurements (Cape Hedo Atmosphere and Aerosol Monitoring Station: CHAAMS) in Okinawa. Particulate nitrate concentrations were measured both with an aerosol mass spectrometer (PM1) and a nitrate monitor (PM10) simultaneously in 2006. NO₃? in Okinawa exists mostly in coarse mode. On the other hand, NO₃? was observed at several ground sites in China (Qingdao, Dalian, Zhoushan, etc.) in 2002-2006. In the emission source area of China, NO₃? existed mainly in fine mode. Clear contrast was observed. Moreover, the fraction of NO₃? contained in fine particles decreased and the fraction of that contained in coarse particles increased according to the transport time from China to Okinawa calculated by back trajectory analyses. Fraction of gaseous species (NOx+HNO₃g) in NOy decreased and fraction of particulate NO₃? increased in the same manner. Chemical transformation takes place during the long range transport.
Chandra, I.,Kim, S.,Seto, T.,Otani, Y.,Takami, A.,Yoshino, A.,Irei, S.,Park, K.,Takamura, T.,Kaneyasu, N.,Hatakeyama, S. Pergamon Press ; Elsevier [distribution] 2016 Atmospheric environment Vol.141 No.-
<P>Field observations to investigate the correlation between New Particle Formation (NPF) and the long-range transport of air pollutants in the East Asia region were carried out on a rural Island of Japan in the East-China Sea (Fukue Island, 32.8 degrees N, 128.7 degrees E) over three periods (February 23 to March 7, 2013; November 7 to 20, 2013; and November 2 to 24, 2014). Frequent NPF events were identified (16 events in 50 days), typically in association with sudden increases in particle number concentrations and the successive growth of particles to mobility diameters of several tens of nanometers. The NPF events were classified into two types (A and B) according to the initially detected particle sizes (onset diameters). Type-A consisted of strong NPF events with onset diameters as small as 5 nm. Type-B consisted of NPF events whose onset (<10 nm) was not clearly identifiable. The correlations of SO2 concentrations, solar radiation, PM2.5 concentrations, and chemical composition were analyzed based on the types of NPF events. (C) 2016 Elsevier Ltd. All rights reserved.</P>