The Hydrologic Cycle and Atmospheric Rivers in CESM2 Simulations of the Last Glacial Maximum

Abstract Proxy reconstructions and model simulations of precipitation during Earth's glacial periods suggest that the locations mechanisms atmospheric moisture transport have changed considerably past. We investigate hydroclimate Last Glacial Maximum (LGM) using with Community Earth System Model, a focus on extratropics influence rivers (ARs), key driver modern‐day globally. Mean extreme increase significantly over southwestern Patagonia, Iberia, North America—mid‐latitude regions affected by ARs in modern climate—despite overall decreases elsewhere. In each, associated changes are different, increased AR activity mainly occurring Atlantic. The LGM response is dominated to ice sheets, other forcings causing additional cooling drying strong decrease subpolar