Sabine Schmidt, Ph.D. (1991), is a marine biogeochemist. She has initial training in chemistry and marine sciences in the context of climate change and uses natural radionuclides as well as those produced by activities such as atomic weapons testing to study Earth surface processes. The difference in different chemical elements within the decay series provides opportunities to study a large range of processes from erosion to sedimentation rates. Her first works were focused on the oceanic margin, an approach which she now applies to transitional and fresh waters. In addition, to better characterize fluxes at the land–ocean interface and impact on water quality, she is responsible for high-frequency monitoring in the Gironde estuary to better understand changes in water quality (defined by salinity, temperature, dissolved oxygen, and turbidity) and to help local water authorities to define preventive management strategies regarding the EU Water Framework Directive (WFD) to reach “good ecological status” of transitional waters.