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Understanding the interaction between anthropogenic air pollution andReactive Halogen Species (RHS) activity has had only limited support fromdirect field measurements, due to the fact that past field measurements ofRHS have been mainly performed in Polar Regions. The present paperinvestigates the interaction between NO2 and Reactive Bromine Species(RBS) activity by model simulations based on extensive field measurementsperformed in the Dead Sea area, as described in a companion paper (Tas etal., 2006). The Dead Sea is an excellent natural laboratory for thisinvestigation since elevated mixing ratios of BrO (up to more than 150 pptv)are frequently observed, while the average levels of NO2 are aroundseveral ppb. The results of the present study show that under the chemicalmechanisms that occur at the Dead Sea, higher levels of NO2 lead tohigher daily average mixing ratios of BrOx. This is the result of anincrease in the rate of the heterogeneous decomposition of BrONO2,which in turn causes an increase in the rate of the "Bromine Explosion"mechanism. However, above a certain threshold level of NO2 (dailyaverage mixing ratios of 0.2 ppbv during RBS activity), the daily averagemixing ratios of BrOx decrease for a further increase in the NO2mixing ratios. This investigation shows that the influence of NO2 onBrOx production clearly reflects an enhancement of RBS activity causedby anthropogenic activity

atmospheric chemistry and physics

Measurement-based modeling of bromine chemistry in the Dead Sea boundary layer – Part 2: The influence of NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; on bromine chemistry at mid-latitude areas