HR: 08:30h
AN: A41D-03    [Abstracts]
TI: Chemical Characteristics of North American Outflow: Insights from Chebogue Point, Nova Scotia
AU: Goldstein, A H
EM: ahg@nature.berkeley.edu
AF: U.C. Berkeley Division of Ecosystem Sciences, 141 Hilgard Hall, Berkeley, CA 94720 United States
AU: * Millet, D B
EM: dbm@io.harvard.edu
AF: U.C. Berkeley Division of Ecosystem Sciences, 141 Hilgard Hall, Berkeley, CA 94720 United States
AU: * Millet, D B
EM: dbm@io.harvard.edu
AF: Harvard University Department of Earth and Planetary Sciences, 29 Oxford St., Cambridge, MA 02138 United States
AU: Allan, J D
EM: james.allan@manchester.ac.uk
AF: The University of Manchester School of Earth, Atmospheric and Environmental Science, P.O. Box 88, Manchester, M60 1QD United Kingdom
AU: Cross, E
EM: espencer@aerodyne.com
AF: Boston College Department of Chemistry, 2609 Beacon St., Chestnut Hill, MA 02467 United States
AU: Holzinger, R
EM: holzing@nature.berkeley.edu
AF: U.C. Berkeley Division of Ecosystem Sciences, 141 Hilgard Hall, Berkeley, CA 94720 United States
AU: Holzinger, R
EM: holzing@nature.berkeley.edu
AF: Boston College Department of Chemistry, 2609 Beacon St., Chestnut Hill, MA 02467 United States
AU: Jimenez, J
EM: jose.jimenez@colorado.edu
AF: University of Colorado Department of Chemistry, UCB 216, Boulder, CO 80309 United States
AU: Williams, B
EM: brentw@nature.berkeley.edu
AF: U.C. Berkeley Division of Ecosystem Sciences, 141 Hilgard Hall, Berkeley, CA 94720 United States
AU: Worsnop, D R
EM: worsnop@aerodyne.com
AF: Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821 United States
AB: We present trace gas, particle and meteorological measurements from southern Nova Scotia during the summer of 2004, and use them to quantify the impact of U.S. pollution outflow and other sources on atmospheric composition at the site. In addition, we explore trends in regional trace gas concentrations over the past decade using historical data from Chebogue Point and Sable Island. The different sources controlling the composition of air arriving at Chebogue Point are identified and characterized using a factor analysis approach. The most important of these were U.S. outflow, local combustion, and biogenic emissions. Average levels of carbon monoxide and ozone in air coming from the eastern seaboard of the U.S. were 30 ppb and 20 ppb higher, respectively, than the average from other sectors. Total aerosol loading was higher by more than a factor of three during periods of U.S. outflow. Organic matter made up the highest proportion of the total aerosol mass during periods of primary and secondary biogenic influence, suggesting the importance of biogenic secondary organic aerosol.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005