HR: 1340h
AN: A43C-0055    [Abstracts]
TI: Transpacific and Regional Atmospheric Transport of Anthropogenic Semivolatile Organic Compounds to Cheeka Peak Observatory During the Spring of 2002
AU: * Simonich, S L
EM: staci.simonich@orst.edu
AF: Department of Chemistry, Oregon State University, Corvallis, OR 97331 United States
AU: * Simonich, S L
EM: staci.simonich@orst.edu
AF: Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331 United States
AU: Killin, R K
EM: robert.killin@orst.edu
AF: Department of Chemistry, Oregon State University, Corvallis, OR 97331 United States
AU: Jaffe, D A
EM: d.jaffe@u.washington.edu
AF: Interdisciplinary Arts and Sciences, University of Washington-Bothell, Bothell, WA 98011 United States
AU: DeForest, C L
EM: cihauser@davidson.edu
AF: Department of Chemistry, Oregon State University, Corvallis, OR 97331 United States
AU: DeForest, C L
EM: cihauser@davidson.edu
AF: Department of Chemistry, Davidson College, Davidson, NC 28035 United States
AU: Wilson, G R
EM: glenn.wilson@orst.edu
AF: Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331 United States
AB: Ambient high-volume (hi-vol) air samples were collected between March 15th and May 30th, 2002, at Cheeka Peak Observatory (CPO), located on the tip of the Olympic Peninsula, Washington State. This sampling campaign was in conjunction with the 2002 Inter-Continental Transport and Chemical Transformation (ITCT 2K2) Campaign and the Photochemical Ozone Budget of the Eastern North Pacific Atmosphere (PHOEBA2) experiment. The anthropogenic semi-volatile organic compounds (SOCs) measured during this time period included polycyclic aromatic hydrocarbons (PAHs) and various U.S. current-use and historical-use pesticides. The total PAH concentration ranged from 0.480-4.49 ng/m3, which is comparable to other remote sites throughout the globe. Ten pesticides (hexachlorobenzene, dacthal, chlorothalonil, heptachlor, trans-nonachlor, cis-nonachlor, endosulfan I, triallate, trifluralin, and mirex) were also measured and their concentrations (0.104-57.0 pg/m3) were comparable to other remote sites and less than agricultural areas. Gas-phase/particle-phase partitioning was explored, with significant correlation to temperature found with endosulfan I and retene and the possible relationship at CPO of low TSP concentration and the concentration of non-exchangeable compounds in the particle phase. Principal Component Analysis, as well as a t-test, showed there were elevated concentrations of anthropogenic SOCs measured during possible Trans-Pacific events on March 15th-16th, March 27th-28th, and April 22nd-23rd, 2002, that were identified using the GEOS-CHEM model. The potential sources of these compounds at CPO were determined using diagnostic ratios of their concentrations, back trajectories calculated using HYSPLIT4, local meteorological conditions, and U.S. pesticide use data. Additional data is needed to confirm the sources of anthropogenic SOCs at CPO during regional and Trans-Pacific atmospheric transport events.
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting