Persistent warm sea surface temperature anomalies (SSTA) in the Northeast Pacific (NEP) have substantial ecological and climate effects. This study delves into the linkage between the Arctic Oscillation (AO) and SSTA in the NEP. Results show that the positive phase of AO in October strongly influences the wintertime warm SSTA in the NEP through local and remote pathways. The local pathway is contingent upon the longitudinal positioning of AO-related high-pressure anomaly in the North Pacific. When easterly anomalies prevail at the southern flank of the high-pressure anomaly over the NEP, they foster warming in the NEP. However, different locations of the high-pressure anomalies may impede the NEP warming. Remote pathways indicate the teleconnections triggered by AO-related precipitation increase in Greenland and decrease in East Asia, sustaining the high-pressure anomaly and promoting the anomalous NEP warming. Hence, this study presents new evidence on polar and mid-latitude climate connections.
 

teleconection,Arctic Oscillation,diabatic heating,high-pressure anomaly,sea surface temperature