Experimentelle Studien der reaktiven Halogenchemie in der polaren Troposphäre

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The objective of the proposed research activity is the experimental investigation of the role of reactive halogen compounds in the chemistry of the polar boundary layer and the free troposphere based on measurements of halogen radicals by Multi-Axis Differential Optical Absorption Spectroscopy (MAXDOAS). Growing evidence has emerged in recent years that the photochemistry of halogens might play an important role in the troposphere on a global scale. The consequences of the presence of reactive halogens in the troposphere are ranging from the destruction of ozone over changes in the balance of important chemical families and the increased deposition of toxic compounds to a potential impact on global climate. However, measurements of halogens in the troposphere are still very sparse. It is therefore of vital importance for a better understanding of tropospheric photochemistry to obtain further insight into the processes reactive halogens are involved in. These processes will be studied by performing MAX-DOAS measurements of tropospheric halogen compounds on various platforms: Ground-based long-term measurements in polar coastal areas and on drifting buoys in the Arctic sea will provide unique information on the diurnal and seasonal variability of reactive halogens and on their sources and sinks in both polar hemispheres. The participation in a field campaign at potential source regions of reactive halogens in Antarctica will be performed to investigate the mechanisms leading to their release into the atmosphere. The analysis of these data has the aim of contributing to a better understanding of the impact of reactive halogens on the atmospheric system.