DOM at interfaces
Coastal oceans are important hot spots for the turnover and storage of carbon at the land-ocean interface. Recent research suggests that organic matter exists along a reactivity continuum that depends not only on the carbon source, but also the ecosystem properties of its surrounding environment. Yet, the transformation of terrestrial organic matter in coastal oceans and its linkage to metals, microbes and nutrients are still not well understood. We study the biogeochemical processing of dissolved organic matter (DOM) across ecosystem boundaries, covering terrestrial-marine gradients in surface estuaries as well as coastal aquifers, to understand how carbon is transformed in coastal regions. Performing research along oxic-anoxic transition zones, for example in intertidal sediments, allows us to probe the impact of ecohydrological interfaces on the transformation of DOM across contrasting environments.