Fig. 2

The spatial distributions of eddy polarity and number in a 1° × 1° grid where (a) is average eddy polarity, defined as (\({\rm{Na}}-{\rm{Nc}}\))/(\({\rm{Na}}+{\rm{Nc}}\)), where \({\rm{Na}}\) is the number of anticyclonic eddies and \({\rm{Nc}}\) is the number of cyclonic eddies, and (b) is average eddy number.