Fig. 6: The relationship between cyclone activity and the Arctic Oscillation.
From: Summer snow on Arctic sea ice modulated by the Arctic Oscillation
a–f, The June–August mean for 1980–2020 in the summed daily presence of cyclones (a), the correlation between cyclone anomalies and the Arctic Oscillation (AO) (b), cyclone anomalies regressed onto the AO index (c), the linear response (composite difference) in cyclone anomalies to the AO (d), the nonlinear response (composite sum) in cyclone anomalies to the AO (e) and cyclone anomalies regressed onto the first principal component of cyclones (f). The light grey contours in c–f are the corresponding results using 1,000 hPa geopotential height anomalies.
