Fig. 2: PNA-associated atmospheric circulation patterns and thermodynamic impacts.
From: Acceleration of western Arctic sea ice loss linked to the Pacific North American pattern
a 500 hPa geopotential height (Z500, m) regressed onto the standardized region-averaged SIC index. b Linear trend (m per decade) of Z500. c Z500 (m) regressed onto the PNA index. d–f Spatial correlations between the detrended PNA index and thermodynamic variables for lower-tropospheric (1000–850 hPa) temperature (shading) and vertically integrated heat flux (arrows) (d), lower-tropospheric (1000–850 hPa) specific humidity (shading), and vertically integrated moisture flux (arrows) e and low cloud cover f. The stippling indicates statistical significance at the 5% level in all plots.
