The Arctic is experiencing accelerated warming, outpacing other regions on Earth. This rapid change is unleashing profound and irreversible effects on the hydrology and ecosystems of pan-Arctic permafrost regions. As temperatures rise and permafrost thaws, the active layer deepens, releasing substantial amounts of soil carbon into the atmosphere as potent greenhouse gases (e.g., CO2 and CH4). This feedback has the potential to intensify climate warming. Permafrost thaw also alters soil moisture redistribution and water table dynamics, increasing subsurface drainage flux, changing landscape inundation conditions, and influencing the emission ratio of CH4 to CO2. Understanding the complex interplay between water, carbon, and climate in high-latitude regions is paramount. We welcome discussions on the hydrological and hydro-biogeochemical impacts of climate warming in high-latitude permafrost regions. This session invites all relevant studies that examine water and carbon cycles in these critical regions using diverse approaches, including process-based modeling, remote sensing, machine learning, and data synthesis.

Submitters: Jing Tao, LBNL, Berkeley, CA and Bethany Sutherland, Woodwell Climate Research Center, Falmouth, MA