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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.