HR: 08:00h
AN: A41G-01 INVITED    [Abstracts]
TI: Halogen Chemistry at North American Coastal Sites
AU: * Stutz, J
EM: jochen@atmos.ucla.edu
AF: University of California Los Angeles, Department of Atmospheric and Oceanic Sciences, 7127 Math Sciences, Los Angeles, CA 90095-1565, United States
AU: Pikelnaya, O
EM: olga@atmos.ucla.edu
AF: University of California Los Angeles, Department of Atmospheric and Oceanic Sciences, 7127 Math Sciences, Los Angeles, CA 90095-1565, United States
AU: Laskin, A
EM: alexander.laskin@pnl.gov
AF: Pacific Northwest National Laboratory, W. R. Wiley Environmental Molecular Sciences Laboratory, P.O.Box 999, MSIN K8-88, Richland, WA 99352, United States
AU: Sumner, A
EM: sumnera@battelle.org
AF: Battelle, 505 King Ave, Columbus, OH 43201, United States
AU: Jobson, B T
EM: tjobson@wsu.edu
AF: Washington State University, Department of Civil and Environmental Engineering, 101 Sloan, Pullman, WA 99164-2910, United States
AU: Finley, B
EM: bfinley@uci.edu
AF: University of California Irvine, Department of Earth System Science 1212 Croul Hall, Irvine, CA 92612, United States
AU: Lawler, M
EM: mlawler@uci.edu
AF: University of California Irvine, Department of Earth System Science 1212 Croul Hall, Irvine, CA 92612, United States
AU: Saltzman, E S
EM: esaltzma@uci.edu
AF: University of California Irvine, Department of Earth System Science 1212 Croul Hall, Irvine, CA 92612, United States
AU: Pszenny, A A
EM: alex.pszenny@unh.edu
AF: Mount Washington Observatory, P.O. Box 2310, North Conway, NH 03860, United States
AU: Deegan, B
EM: corvus@localnet.com
AF: Mount Washington Observatory, P.O. Box 2310, North Conway, NH 03860, United States
AB: In recent years observational evidence has emerged that reactive halogen species (RHS), such as chlorine atoms, and bromine and iodine oxides, are present in coastal areas. Their chemistry can be significant as they catalytically destroy O₃; oxidize hydrocarbons, dimethylsulfide, and S(IV); and modify NO_x and HO_x cycling. Despite their potential importance our observational database on RHS is still very limited. Most observations of RHS thus far have been made in clean areas and very few observations along the North American coast have been made.
Here we will review our current understanding of RHS chemistry in both clean and polluted environments. Recent observations at coastal areas around the world will be discussed. We will also give an overview of an experiment performed by our group in Malibu, CA in October 2006 and present initial results. A suite of trace gases and environmental parameters, including halogen molecules, halogen oxides, Cl + VOC reaction products, aerosol composition, O₃, NO_x, CO, VOCs, meteorology, and radiation, were measured during a three week period. In addition, Cl + VOC reaction products were measured at two locations in urban Los Angeles. Clear evidence for the presence of various halogen species on the California coast was found. Observations during periods with relatively clean marine air and during times where our site was in the outflow of Los Angeles show the impact of pollution on coastal atmospheric chemistry. Our observations will be compared to earlier studies of halogen chemistry at coastal areas to further advance our understanding of halogen chemistry.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting