Fig. 3: Relationship between PET time series and atmospheric circulation.
From: Changes in sea ice concentration explain half of the winter warming of the Arctic surface
a Regression coefficient of detrended DJF-mean sea level pressure (SLP in hPa) anomalies upon the standardized detrended PET index (black line in Fig. 1b) with 0.01 significance levels (stippling) during 1980-2024. b Composite difference of detrended DJF-mean SLP anomalies averaged over years wherein the standardized detrended PET index exceeds one standard deviation. The uncentered pattern correlation over north of 20°N between (a) and (b) is 0.83. c Raw (black), dynamically induced (blue), and residual (red) DJF-mean PET anomaly time series over the Arctic (poleward of 70°N). R2 is the square of correlation coefficient between black and blue lines.
