Research Group Keppler Biogeochemistry
Processes and Material Fluxes in the Earth System
Biogeochemistry investigates the chemical, biological and physical processes that govern the exchange of matter between the atmosphere, biosphere, hydrosphere, pedosphere and lithosphere. Our research group studies how natural and anthropogenic factors shape these cycles – from the early history of the Earth to the Anthropocene.
A particular focus lies on climate-relevant trace gases such as carbon dioxide, methane, nitrous oxide, as well as chloromethane and methanol. We analyse their formation mechanisms, their sources and sinks, and their roles in climate change and stratospheric ozone chemistry. Our work combines laboratory experiments, field measurements and theoretical approaches.
Stable isotopes are key tools in our research: they allow us to elucidate reaction pathways, quantify environmental changes and trace material fluxes across ecological and geochemical systems. Our expertise includes both high-precision isotopic characterisation of climate gases and the development of novel analytical measurement techniques.
We use natural archives such as tree rings and sediments to reconstruct past climate and environmental changes. In addition, we apply isotope-geochemical methods in related areas – for example, to determine the origin and authenticity of food products or to characterise biogas production processes. We also investigate the occurrence and fate of environmental contaminants such as arsenic. Through this interdisciplinary approach, the Biogeochemistry Group contributes to a deeper understanding of fundamental processes within the Earth system and provides scientific foundations for a responsible stewardship of our planet.
