Water tracer model-assessed contributions of source waters to changing circumpolar Arctic terrestrial evapotranspiration and river discharge

作者：Hotaek Park, Youngwook Kim, J. J. Gibson, Tetsuya Hiyama · 发表于：Journal of Hydrology · 年份：2025 · DOI：10.1016/j.jhydrol.2025.134379 · 被引用次数：4 · 研究领域：Climate change and permafrost、Cryospheric studies and observations、Arctic and Antarctic ice dynamics

• Tracer model quantitatively separated contributions of source waters to evapotranspiration and discharge in the Arctic river basins. • Rain and snowmelt water are major sources to evapotranspiration and discharge, respectively, and discharge shows seasonally varying sources. • Rain plays a key role in driving interannual, seasonal, and regional variability of evapotranspiration and discharge. • The individual roles of rain and groundwater to evapotranspiration and discharge are increasing during 1979 to 2016. Climate change has resulted in alteration of snow cover, permafrost degradation, vegetation infilling, and precipitation apportionment across the Arctic terrestrial region, which has in turn affected the balance of hydrological processes including seasonality and interaction of snowmelt, rain, and soil water storage. Effects on Arctic river discharge have been widely observed, although relatively few studies have provided detailed assessments of the underlying causes of change, including adjustments in the timing and relative contributions of source waters (i.e., snowmelt, rainwater, soil water, permafrost thaw) and the effects of altered evapotranspiration regimes. Principal challenges have included limitations in the observational networks, which have often frustrated efforts to reliably model complex changes that are underway. This study explores a tracer-aided ecohydrological model that was used to quantitatively assess source water contributions to evapotranspirat...