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

• 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

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研究组Haloproc的一部分，所提出的活动的目的是通过差异光吸收光谱在大气中的反应性卤素（RH）化学的投资。 RH的重要性包括破坏臭氧，化学平衡的变化，有毒化合物的沉积增加（如汞）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“溴爆炸”的事件（从盐表面自动催化反应性溴 - 对臭氧破坏的关键），这些事件强烈依赖于pH和湿度。根据盐平台对先前的观察结果，霍尔普洛克1期间，纳米比亚/博茨图那，俄罗斯南部和毛里塔尼亚的现场运动的测量表明，BRO和IO水平比预期的比预期低1至2个数量级。环境条件可能具有强大的影响力，这与烟雾室研究一致。第二阶段的主要问题之一是发生RH激活的情况。盐表面上的氯和碘化合物的反应是否与溴的反应以及不同的RH化合物相互相互作用，这引起了人们的关注。此外，氮的氧化物对于它们在RH重新激活中的作用可能很重要。纳米比亚和南俄罗斯的拟议现场运动将使我们能够调查RH化合物的来源，下沉和转变。这项工作将通过与不同的卤素氧化物以及光化学模型计算相应的烟雾室实验来完成。

项目成果

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.

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

• DOI: 10.1071/en14226
• 发表时间: 2015
• 期刊: Environmental Chemistry
• 影响因子: 4.3
• 作者: Buxmann J

Observations of bromine explosions in smog chamber experiments above a model salt pan

模型盐盘上方烟雾室实验中溴爆炸的观察

• DOI: 10.1002/kin.20714
• 发表时间: 2012
• 期刊: International Journal of Chemical Kinetics
• 影响因子: 1.5
• 作者: Buxmann;N. Balzer;S. Bleicher;U. Platt;C. Zetzsch
• 通讯作者: C. Zetzsch

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

Broadband Cavity Enhanced Differential Optical Absorption Spectroscopy (CE-DOAS) – applicability and corrections

• DOI: 10.5194/amt-2-713-2009
• 发表时间: 2008-12
• 期刊: Atmospheric Measurement Techniques
• 影响因子: 3.8
• 作者: U. Platt;J. Meinen;D. Pöhler;T. Leisner