Investigation of the influences of halogen chemistry on the oxidation capacity of the atmosphere in mid-latitudes and the ozone budget

如在极地地区以及在中纬度地区如以色列的死海（DS）所观察到的，反应性卤素物质（“RHS”，例如一氧化溴，BrO）可以破坏边界层中的臭氧，从而大大降低对流层的氧化能力。在海德堡大学和耶路撒冷希伯来大学的一个联合项目中，将调查RHS的释放机制和对对流层化学的影响及其对中纬度大气组成的后果。在以色列死海谷的实地活动计划。由于其地理位置和地形，它可以被视为一个大规模的天然“实验室”。需要回答的问题包括向大气中释放RHS的机制的细节，特别是“溴爆炸”机制，对RHS释放的可能人为影响，释放的卤素总量的确定，以及卤素氧化物（BrO，CIO，IO，OCIO，OBrO）在区域臭氧破坏中的参与。根据这些数据，可以更好地评估RHS对对流层化学和全球臭氧收支的影响。主要的测量技术将是差分光学吸收光谱（DOAS）。

As observed at polar regions as well as at mid-latitudinal sites like the Dead Sea (DS)in Israel, Reactive Halogen Species ("RHS", e.g. bromine monoxide, BrO) can destroy ozone in the boundary layer and thus largely reduce the oxidation capacity of the troposphere. In a joint project between the University of Heidelberg and the Hebrew University Jerusalem release mechanisms and the influence of RHS on tropospheric chemistry and their consequences on the atmospheric composition at mid latitudes will be investigated. Field campaigns in the Dead Sea Valley in Israel are planned.Because of its geographical position and topography it can be regarded as a large scale natural "laboratory". Questions to be answered include the details of the mechanisms releasing RHS to the atmosphere, in particular the "Bromine Explosion" mechanism, a possible anthropogenic influence on RHS release, determination of the total amount of halogens released, and the involvement of halogen oxides (BrO, CIO,IO,OCIO,OBrO) in regional ozone destruction. From these data a better assessment of the influence of RHS on the chemistry of the troposphere and the global ozone budget can be attained. The main meassurement technique will be Differential Optical Absorption Spectroscopy (DOAS).