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10.5194/acpd-8-7725-2008
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http://www.atmos-chem-phys-discuss.net/8/7725/2008/acpd-8-7725-2008.pdf
7725
7753
2008-04-21
Measurement-based modeling of bromine chemistry at the Dead Sea boundary layer – Part 2: The influence of NO<sub>2</sub> on bromine chemistry at mid-latitude areas
E. Tas
erant@mpch-mainz.mpg.de
M. Peleg
D. U. Pedersen
V. Matveev
A. P. Biazar
M. Luria
Institute of Earth Sciences, Hebrew University of Jerusalem, Israel
Atmospheric Chemistry Division, Max-Planck-Institut für Chemie, Mainz, Germany
Earth System Science Center, University of Alabama in Huntsville, Huntsvile, AL 35899 USA
Understanding the interaction between anthropogenic air pollution and
Reactive Halogen Species (RHS) activity has had only limited support of
direct field measurements, due to the fact that past field measurements of
RHS have been mainly performed in Polar Regions. The present paper
investigates the interaction between NO<sub>2</sub> and Reactive Bromine Species
(RBS) activity by model simulations based on extensive field measurements
performed in the Dead Sea area, as described in a companion paper (Tas et
al., 2006). The Dead Sea is an excellent natural laboratory for this
investigation since elevated concentrations of BrO (up to more than 150
pptv) are frequently observed, while the average levels of NO<sub>2</sub> are
around several ppb. The results of the present study show that under the
chemical mechanisms that occur at the Dead Sea, higher levels of NO<sub>2</sub>
lead to higher daily average concentrations of BrO<sub>X</sub>, as a result of an
increase in the rate of the heterogeneous decomposition of BrONO<sub>2</sub> that
in turn causes an increase in the rate of the "Bromine Explosion"
mechanism. The present study has shown that the influence of NO<sub>2</sub> on
BrO<sub>X</sub> production clearly reflects an enhancement of RBS activity caused
by anthropogenic activity. However, above a certain threshold level of
NO<sub>2</sub> (daily average mixing ratios of 0.2 ppbv during RBS activity), the
daily average concentrations of BrO<sub>X</sub> decrease for a further increase in
the NO<sub>2</sub> concentrations.
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