Persistent anomalies of the extratropical Northern Hemisphere wintertime circulation: geographical distribution and regional persistence characteristics.

Abstract

We have studied the geographical and regional persistence characteristics of wintertime Northern Hemisphere 500 mb height anomalies, focusing particular attention on the behavior of strong anomalies that persist beyond the durations associated with synoptic-scale variability. We have also examined the persistence variability. There are three major regions for the occurrence of persistent anomalies: the North Pacific to the S of the Aleutians, the North Atlantic to the SE of Greenland, and from the northern Soviet Union NE to over the Arctic Ocean.-from Authors