Critical interfaces are environments where complex transformations and fluxes of carbon, nutrients, solutes, heat, and water are concentrated. These include the near land-surface environment, root-soil interface, river-floodplain corridor, hyporheic zone, coastal environment, regoliths, wetlands and tidal marshes, among others. Overall, it is important to understand processes at these interfaces to gain predictability across spatial and temporal scales. For examples: the root-soil interface is a highly active zone for nutrient and water exchanges, the near-surface interface is where vegetation and surface characteristics dictate vertical and lateral fluxes, and the floodplain-river interface controls flows and carbon transport in a watershed. This session seeks contributions related to critical interfaces in different facets of critical zones ranging from observational studies to modeling and machine learning-based predictive characterizations. Submissions should emphasize the role of these critical interfaces in regulating, storing, transforming, or transporting materials across spatial and temporal scales.

• B - Biogeosciences