North Pacific Oscillation (SLP EOF2)

PC2 of monthly DJFM SLP anomalies 20–85°N, 120°E–120°W (√cos weighted), projected daily. Positive = low over Alaska/Bering, high near Hawaii (sign convention varies between papers). The SLP expression of the WP pattern. — Rogers 1981, Mon. Wea. Rev. 109, 2093–2106; Linkin & Nigam 2008, J. Climate 21, 1979–1997, doi:10.1175/2007JCLI2048.1