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Information - AS3.14 Implications of emission, transport, and reaction of atmospheric halogens: I - Boundary Layer and 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, iodine oxides have been shown to lead to new
particle formation. The reactions affecting ozone are most obvious in
the polar troposphere during the springtime ozone depletion
events. However, reactive halogen chemistry has also been observed in
the troposphere outside the polar regions (e.g. volcanoes, salt lakes
and the marine boundary layer) and there are strong indications for
the presence of BrO in the free troposphere. 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 troposphere including in situ and
remote sensing techniques.
Studies that are linked with OASIS (Ocean - Atmosphere - Sea Ice -
Snowpack) or other projects that are part of the International Polar
Year (IPY) programme and the project RHaMBLe (Reactive Halogens in the
Marine Boundary Layer) are especially encouraged to contribute to this
session. This session is a contribution to the IGAC/SOLAS task
"Halogens in the Troposphere" (HitT).
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Preliminary List of Solicited Speakers |
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 Back to Session Programme
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