HR: 0800h
AN: A11C-0612    [Abstracts]
TI: Continuous measurements of perfluorocarbons at remote monitoring stations in Japan
AU: * Saito, T
EM: saito.takuya@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: Yokouchi, Y
EM: yokouchi@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: Mukai, H
EM: lnmukaih@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AB: In order to determine the trends and regional sources in East Asia, continuous measurements of halocarbons including perfluorocarbons (PFCs), powerful greenhouse gases, has been performed by fully-automated preconcentration/gas chromatograph/mass spectrometer at remote monitoring stations at Hateruma island (24.1 ° N, 123.8 ° E) since 2004 and Cape Ochiishi (43.1 ° N, 145.3 ° E) since 2006 in Japan. The measurements show that the background concentrations of PFCs in 2007 were 3.7 ppt for PFC-116, 0.5 ppt for PFC-218, and 1.3 ppt for PFC-318. As for PFC-116, slight increasing trend was observed at Hateruma. Enhanced concentration above the baseline were occasionally observed in air masses which had passed over urban areas such as Shanghai, Taipei, and Tokyo, suggesting great anthropogenic emission there, while the frequency of the enhancements were relatively low compared to those of hydrofluorocarbons.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting