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Information - AS3.08 Reactive Halogen Compounds in the Lower and the Free Troposphere
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Event Information |
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Evidence is accumulating that reactive halogen species can have an important influence on the chemistry of the lower and the free troposphere. Chlorine atoms react faster with most hydrocarbons than OH does. Inorganic bromine and iodine may catalytically destroy tropospheric ozone. These reactions are most obvious in the polar troposphere during the springtime ozone depletion events. However, there are also indications for halogen activation in the troposphere outside the polar regions (e.g. volcanoes, salt lakes and the marine boundary layer). These processes can be initiated by various mechanisms including release of halides from sea salt (aerosol, deposits, or sea water) and biogenic emissions of halogenated organics. We invite contributions in the following areas:
- Model studies: Investigations of the chemical mechanisms leading to release, transformation and removal of reactive halogen species in the troposphere. Studies of consequences of the presence of reactive halogen species in the troposphere.
- Laboratory studies: Determination of gas- and aqueous-phase rate constants, Henry's law and uptake coefficients, UV/VIS spectra, and other properties of reactive halogen species.
- Field experiments: Measurements of inorganic (X, XO, HOX, XONO2, ..., X = Cl, Br, I) and organic (CH3Br, CHBr3, CH3I, RX, ...) reactive halogen species in the lower troposphere.
Studies that are linked with OASIS (Ocean – Atmosphere – Sea Ice – Snowpack) or other projects that are part of the International Polar Year (IPY) programme are especially encouraged to contribute to this session.
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Preliminary List of Solicited Speakers |
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