Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra Ecosphere

Climate change, including both increasing temperatures and changing snow regimes, is progressing rapidly in the Arctic, leading to changes in plant phe- nology and in the seasonal patterns of plant properties, such as tissue nitrogen (N) content and community aboveground biomass. However, significant knowledge gaps remain over how these seasonal patterns vary among Arcticplant functional groups (i.e., shrubs, grasses, and forbs) and across large geo- graphical areas. We used three years of in situ field vegetation sampling from