Tian et al. (2025): Stability of alkalinity in the land-ocean transition zone: a geochemical CDR perspective for the Elbe River, Germany
Mingyang Tian, Jens Hartmann, Niels Suitner, Thorben Amann, Stephan Kempe, Carl Lim and Charly A Moras, IN: Environmental Research Letters, https://doi.org/10.1088/1748-9326/adeeab
Carbon dioxide removal (CDR) strategies like enhanced weathering and river/ocean alkalinity enhancement have been suggested to increase alkalinity in rivers, coastal areas, and eventually oceans. The effectiveness and sustainability of these CDR approaches depend on the persistence of added alkalinity, since exceeding certain Ω-thresholds for a given water composition may lead to carbonates formation, causing the loss of previously added alkalinity. In this research, stability of alkalinity was tested using incubation experiments with Elbe estuary freshwater from two seasons (March and August).