HR: 0800h
AN: A21A-0831    [Abstracts]
TI: Observations of Reactive Chlorine and Bromine over the Gulf of Maine
AU: * Stutz, J
EM: jochen@atmos.ucla.edu
AF: University of California Los Angeles, Department of Atmospheric and Oceanic Sciences, Los Angeles, CA 90095-1565 United States
AU: Keene, W
EM: wck@virginia.edu
AF: University of Virginia, Department of Environmental Sciences, Clark Hall, 291 McCormick Rd., Charlottesville, VA 22904 United States
AU: Pszenny, A
EM: alex.pszenny@unh.edu
AF: University of New Hampshire, Inst. for Study of Earth, Oceans & Space, 39 College Road, Morse Hall, Durham, NH 03824 United States
AU: Pszenny, A
EM: alex.pszenny@unh.edu
AF: Mount Washington Observatory, PO Box 2310, North Conway, NH 03860 United States
AU: Fisher, E
EM: efischer@mountwashington.org
AF: Mount Washington Observatory, PO Box 2310, North Conway, NH 03860 United States
AU: Degan, R
EM: rdegan@mountwashington.or
AF: Mount Washington Observatory, PO Box 2310, North Conway, NH 03860 United States
AU: Sive, B
EM: bcs@gust.sr.unh.edu
AF: University of New Hampshire, Inst. for Study of Earth, Oceans & Space, 39 College Road, Morse Hall, Durham, NH 03824 United States
AU: Varner, R
A21A-0831 AF: University of New Hampshire, Inst. for Study of Earth, Oceans & Space, 39 College Road, Morse Hall, Durham, NH 03824 United States
AU: Pechtel, S
EM: Susanne.Marquart@iup.uni-heidelberg.de
AF: University of Heidelberg, Institute for Environmental Physics, INF 229, Heidelberg, 69120 Germany
AU: von Glasow, R
EM: roland.von.glasow@iup.uni-heidelberg.de
AF: University of Heidelberg, Institute for Environmental Physics, INF 229, Heidelberg, 69120 Germany
AB: Reactive chlorine and bromine compounds can have a significant impact on gas and aerosol chemistry in the marine boundary layer. Their chemistry catalytically destroys O₃, oxidizes hydrocarbons, dimethylsulfide, and S(IV), and modifies NO_x and HO_x cycling. In addition, the phase partitioning of HCl regulates aerosol pH and associated pH-dependent reactions including halogen activation and S(IV) oxidation. Despite their significance for marine boundary layer chemistry, few observations of reactive chlorine and bromine species and their precursors have been reported. Here we present a comprehensive data set of measurements of halogen species, their precursors, and aerosol composition acquired in summer 2004 during the CHAiOS field experiment in the Gulf of Maine. Observations show HCl mixing ratios of up to 2 ppb, non-HCl inorganic chlorine mixing ratios between 50 - 400 ppt, and aerosol chloride deficits of up to 90%. Bromine levels were generally found to be low. Our data will be discussed with respect to sources of chlorine atoms precursors, the steady state chlorine atom concentration, and the general impact of bromine and chlorine on ozone concentrations.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005