Cryospheric environments, including glaciers, ice sheets, permafrost and meltwater systems, are active zones of biogeochemical cycling and weathering. These regions mediate mineral dissolution, carbon and nutrient fluxes, sediment mobilisation and greenhouse gas dynamics. This session invites studies examining chemical, physical, biological and isotopic processes in cold environments using techniques such as stable and cosmogenic isotopes, hydrochemistry, geochemical modelling and sediment analysis. We welcome research that reconstructs past meltwater pathways, chemical weathering regimes and cryospheric feedbacks to climate and geochemical systems. Contributions that explore microbial or organic matter dynamics, or the cryosphere’s role in regulating global cycles and environmental thresholds, are particularly encouraged. Submissions integrating field observations, laboratory analyses and modelling are of special interest.