MA7 Global Atmospheric Transport
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() Semi-volatile organic compounds in Eurasian air masses measured at a rural site in Okinawa Japan.
Primbs, T.1, Schmedding, D.1, Jaffe, D.2, Simonich, S.1, 1 Oregon State University, Corvallis, OR, U.S.A.2 University of Washington, Bothell, WA, U.S.A.
ABSTRACT- High volume air sampling was conducted at a remote site in Okinawa, Japan to determine the chemical composition of Eurasian air masses during a six week campaign from March 19 to May 1, 2004. The sampling site is located on the northwestern tip of the island of Okinawa (26 °52′N, 128 °15′E, 60m). The air masses influencing the site change from marine air to continental air from Eurasia during the spring months. The presence of 84 semi-volatile organic compounds (SOCs) was investigated: including 32 organochlorines, 18 polycyclic aromatic hydrocarbons (PAHs), 12 polychlorinated biphenyls (PCBs), 11 carbamates, 5 organophosphates, and 6 s-triazines. They represent emissions from combustion (PAHs), agricultural (pesticides), and industrial (PCBs) sources. The gas phase was collected using a combination of polyurethane foam and XAD-2 resin, while the particle phase was collected using glass fiber filters. Over the six week campaign, 23 samples were taken in 24 hour sampling periods with an average flow rate of 1.4 m3/min. The samples were extracted using accelerated solvent extraction and the extracts analyzed by GC/MS (EI and ECNI). Air trajectories were calculated using data from NOAA′s HYSPLIT and imported into the ARC/GIS program for spatial representation. The chemical composition of the sampled air masses was determined and potential sources identified.
Key words: atmospheric transport, semi-volatile organic compounds