My research focusses on air-sea exchange and stable isotope measurements of atmospheric gases and aerosols.

I analyse marine dissolved gases to study their variability on small and large temporal and spatial scales. In particular, I apply a recently developed method based on membrane inlet mass spectrometry to make continuous shipboard measurements of oxygen/argon and nitrogen/argon ratios in the surface layer of the World's Oceans. The oxygen/argon ratios inform us about biological net productivity, whereas the nitrogen/argon ratios have a story to tell on gas exchange through bubbles. Absolute nitrogen and argon concentrations can be derived from simultaneous precise oxygen concentration measurements. The concentrations of inert gases such as nitrogen and argon are expected to react sensitively to changes in the oceanic heat budget. These are all important aspects in a world governed by rising carbon dioxide emissions and anthropogenic climate change.

Moreover, I am interested in using the isotopic signature of atmospheric compounds to trace their origin and fate in biogeochemical systems. I am studying the kinetic isotope fractionation of trace gases in gas-phase reactions and the isotope effects accompanying microbial production processes that lead to emission of gases to the atmosphere. This research will lead to a better understanding of human perturbations to the natural atmosphere.

Further details can be found on my personal web pages - please explore.