Measurement-based modeling of bromine chemistry in the Dead Sea boundary layer – Part 2: The influence of NO 2 on bromine chemistry at mid-latitude areas
Measurement-based modeling of bromine chemistry in the Dead Sea boundary layer – Part 2: The influence of NO 2 on bromine chemistry at mid-latitude areas
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DOI：
10.5194/acp-8-4811-2008
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发表时间：
2008-08
影响因子：
6.3
通讯作者：
E. Tas;M. Peleg;Daniel U. Pedersen;V. Matveev;A. Biazar;M. Luria
中科院分区：
文献类型：
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作者：
E. Tas;M. Peleg;Daniel U. Pedersen;V. Matveev;A. Biazar;M. Luria
了解人为空气污染和活性卤素物种（RHS）活动之间的相互作用只有有限的支持，从直接的现场测量，由于过去的现场测量RHS主要是在极地地区进行。本论文通过基于在死海地区进行的广泛现场测量的模型模拟研究了NO 2和活性溴物种（RBS）活性之间的相互作用，如配套论文（Tas等人，2006年）。死海是一个很好的天然实验室，因为经常观察到BrO的混合比升高（高达150 pptv以上），而NO 2的平均水平约为几ppb。本研究的结果表明，在化学机制下，发生在死海，更高水平的NO 2导致更高的每日平均混合比的BrO x。这是BrONO 2的非均相分解速率增加的结果，这反过来又导致“溴爆炸”机制的速率增加。然而，超过一定的阈值水平的NO2（日平均混合比为0.2 ppbv的RBS活动期间），每日平均混合比的BrOx下降的NO2混合比的进一步增加。研究表明，NO2对BrOx产生的影响明显反映了人为活动引起的RBS活性增强。
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 2 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 2 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 2 lead to higher daily average mixing ratios of BrO x . This is the result of an increase in the rate of the heterogeneous decomposition of BrONO 2 , which in turn causes an increase in the rate of the "Bromine Explosion" mechanism. However, above a certain threshold level of NO 2 (daily average mixing ratios of 0.2 ppbv during RBS activity), the daily average mixing ratios of BrO x decrease for a further increase in the NO 2 mixing ratios. This investigation shows that the influence of NO 2 on BrO x production clearly reflects an enhancement of RBS activity caused by anthropogenic activity.