There are numerous compounds which differ in their reactivity. They are emitted by a variety of sources and the atmospheric distributions of most organic compounds exhibit a high variability. Consequently, understanding the atmospheric chemistry of VOC is not an easy task. The results of these experiments are used to derive and modify conceptual or numerical models and thus to deepen our understanding of important processes in the atmosphere. In this context it is important to realize that new insight derived from studies of VOC often is not specific for VOC, but has general relevance for the chemistry of the atmosphere.
Experimental studies require adequate measurement methods.
The work done in our group therefore includes development and modification of methods for the analysis of VOC in air samples. This method is used to study the spatial and temporal variability of the isotopic composition of VOC in the troposphere as well as of VOC sources. The isotopic fractionation effect during degradation will be studied in laboratory experiments. It can be expected that this new method will supply additional constraints for the interpretation of atmospheric observations and thus improve the quantitative understanding of VOC chemistry. Studies of isotope fractionation effects in laboratory kinetic experiments and of VOC emitters will also be very valuable to obtain additional insight into the chemical reactions involved in these processes.