Evaporation dominates evapotranspiration on Alaska’s Arctic Coastal Plain

摘要: The dynamics of evapotranspiration (ET), such as the partitioning to evaporation and transpiration, polygonal ground on Arctic Coastal Plain are not well understood. We assessed ET dynamics, including transpiration partitioning, created by microtopographic features associated with high- low-centered polygons. Chamber leaf-level measurements were conducted in one-week field campaigns two growing seasons contrasting weather conditions. found that was greater drier warmer sampling period (2013) compared colder wetter one (2014). Evaporation dominated ET, particularly (>90% 2014 vs. 80% 2013). In 2013 period, conditions increased contribution ET. If soils warm degrading permafrost, fraction contributed may increase a certain threshold, when moisture must rising temperatures further these fluxes. While rise soils, it is unlikely will completely dominate This work highlights complexities understanding this dynamic environment importance differences across ground.