Fig. 4.

Projected changes in spring air temperature (average March to May) along the four largest Arctic rivers for two future time periods (2041–2070 and 2071–2100) compared with the current baseline climate (1979–2008): a current and projected 0°C isotherm dates along the main-stem reaches of the four large Arctic rivers; b current and projected air temperature at the time when the upstream sections of the 2000-km main-stem reach 0°C; and c associated differences in air temperature between current and future climates. The solid blue and red lines are the GCM-ensemble means, while shading denotes the full range of projected GCM values. Source Prowse et al. (2010)