Trans-Pacific and Regional Atmospheric Transport of Anthropogenic Semivolatile Organic Compounds to Mt. Bachelor Observatory, U.S.A. from Spring 2004 to Spring 2006

Anthropogenic semivolatile organic pollutants (SOCs) undergo long-range atmospheric transport to the western U. S. from global and Eurasian sources as well as regional atmospheric transport from North American sources. High elevation sites in the western U.S. may be in the free troposphere more often than lower elevation sites, and allow for more conclusive identification of trans-Pacific transport events to the western U.S. Atmospheric measurements of anthropogenic SOCs were made at Mt. Bachelor Observatory (MBO) located in Oregon's Cascade Range (43.98°N, 121.69°W, 2.7 km a.s.l.) to further understand the trans- Pacific transport of SOCs. High volume air sampling (~644 m3 for 24 hour periods) of both the gas and particulate phases was conducted from April 2004 to May 2006 at MBO. The presence of 81 SOCs was investigated in the 80 air samples collected. Air trajectories were calculated using data from NOAA^{'}s HYSPLIT and imported into the ArcGIS program for spatial representation. Differences in SOC compositions between long-range and regional atmospheric transport events was investigated.