Fig. 1: Changes in western Arctic sea ice and Pacific North American (PNA) index.
From: Acceleration of western Arctic sea ice loss linked to the Pacific North American pattern
a Linear trend (% per decade) of summer (August–September–October, ASO) sea-ice concentration (SIC) over the period 1979–2016. b SIC regressed onto the PNA index (see “Methods” section). c Time series of SIC (bar) averaged over the region with the fastest SIC decline (165–215°E and 71–76°N, red box) and PNA index (inverted, curve). The stippling indicates statistical significance at the 5% level in a and b.
