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Investigation of reactive halogen species in a smog chamber and in the field

烟雾室和现场活性卤素物质的研究

基本信息

批准号：
51217343
负责人：
Professor Dr. Ulrich Platt
金额：
--
依托单位：
Institut für Umweltphysik
依托单位国家：
德国
项目类别：
Research Units
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/51217343?language=en
关键词：
Investigation reactive halogen species smog

项目摘要

The objective of the proposed activities as part of the DFG research group HaloProc is the investigation of Reactive Halogen (RH) chemistry in the atmosphere by Differential Optical Absorption Spectroscopy. The importance of RH includes the destruction of ozone, change in the chemical balance, increased deposition of toxic compounds (like mercury) and potential indirect effects on global climate. In our laboratory experiments we observed events of “Bromine Explosion” (auto catalytic release of reactive bromine from salt surfaces – key to ozone destruction) that were strongly dependent on pH and humidity. Our measurements from field campaigns in Namibia/Botsuana, Southern Russia and Mauritania during HaloProc1 showed 1 to 2 orders of magnitude lower BrO and IO levels than expected based on previous observations at salt flats. Environmental conditions might have strong influence, which would be consistent with the smog chamber studies. One of the main questions of the second phase is under which conditions does RH activation take place. It is of great interest whether reactions of chlorine and iodine compounds on salt surfaces are similar to those of bromine, and whether different RH compounds interact with each other. In addition, oxides of nitrogen might be important for their role in the reactivation of RH. Proposed field campaigns in Namibia and South Russia will allow us to investigate the sources, sinks and transformations of RH compounds. This work will be complemented by corresponding smog chamber experiments with measurements of different halogen oxides as well as photochemical model calculations.

作为DFG研究小组HaloProc的一部分，拟议活动的目标是通过差分光学吸收光谱法研究大气中的反应性卤素（RH）化学。相对湿度的重要性包括臭氧的破坏、化学平衡的变化、有毒化合物（如汞）沉积的增加以及对全球气候的潜在间接影响。在我们的实验室实验中，我们观察到强烈依赖于pH值和湿度的“溴爆炸”事件（盐表面活性溴的自动催化释放-臭氧破坏的关键）。我们在纳米比亚/Botsuana，俄罗斯南部和毛里塔尼亚HaloProc 1期间的实地活动的测量结果显示，BrO和IO水平比根据先前在盐滩的观测结果预期的低1至2个数量级。环境条件可能有很大的影响，这将与烟雾室研究一致。第二阶段的主要问题之一是在什么条件下RH活化发生。氯和碘化合物在盐表面上的反应是否与溴的反应类似，以及不同的RH化合物是否相互作用，这是非常有趣的。此外，氮的氧化物可能是重要的，因为它们在RH的再活化中的作用。在纳米比亚和俄罗斯南部拟议的实地活动将使我们能够调查RH化合物的来源，汇和转化。这项工作将补充相应的烟雾室实验测量不同的卤素氧化物以及光化学模型计算。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

An instrument for measurements of BrO with LED-based Cavity-Enhanced Differential Optical Absorption Spectroscopy

DOI：
10.5194/amt-7-199-2014
发表时间：
2014-01-01
期刊：
ATMOSPHERIC MEASUREMENT TECHNIQUES
影响因子：
3.8
作者：
Hoch, D. J.;Buxmann, J.;Platt, U.
通讯作者：
Platt, U.

Halogenation processes of secondary organic aerosol and implications on halogen release mechanisms

DOI：
10.5194/acp-12-5787-2012
发表时间：
2012-07
期刊：
Atmospheric Chemistry and Physics
影响因子：
6.3
作者：
J. Ofner;N. Balzer;J. Buxmann;H. Grothe;P. Schmitt‐Kopplin;U. Platt;C. Zetzsch
通讯作者：
J. Ofner;N. Balzer;J. Buxmann;H. Grothe;P. Schmitt‐Kopplin;U. Platt;C. Zetzsch

Consumption of reactive halogen species from sea-salt aerosol by secondary organic aerosol: slowing down the bromine explosion

二次有机气溶胶消耗海盐气溶胶中的活性卤素：减缓溴爆炸