ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-8-4811-2008 Measurement-based modeling of bromine chemistry in the Dead Sea boundary layer – Part 2: The influence of NO<sub>2</sub> on bromine chemistry at mid-latitude areas Tas E. 1 2 Peleg M. 1 Pedersen D. U. 1 Matveev V. 1 Biazar A. P. 3 Luria M. 1 Institute of Earth Sciences, Hebrew University of Jerusalem, Israel Atmospheric Chemistry Division, MPI for Chemistry, Mainz, Germany Earth System Science Center, University of Alabama in Huntsville, Huntsvile, AL 35899 USA 19 08 2008 8 16 4811 4821 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/8/4811/2008/acp-8-4811-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/4811/2008/acp-8-4811-2008.pdf

Understanding the interaction between anthropogenic air pollution and Reactive Halogen Species (RHS) activity has had only limited support from 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 mixing ratios 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 mixing ratios of BrO<sub>x</sub>. This is the result of an increase in the rate of the heterogeneous decomposition of BrONO<sub>2</sub>, which in turn causes an increase in the rate of the "Bromine Explosion" mechanism. 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 mixing ratios of BrO<sub>x</sub> decrease for a further increase in the NO<sub>2</sub> mixing ratios. This investigation shows 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.

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