Glossary
The English version of our glossary is currently under construction and will be regularly updated.
Annular Mode
Predominant atmospheric circulation pattern that reflects changes in the mean zonal westerly wind in the middle latitudes.
Predominant atmospheric circulation pattern that reflects changes in the mean zonal westerly wind in the middle latitudes. The “Northern Annular Mode” is strongly correlated with the North Atlantic Oscillation. The “Southern Annular Mode” manifests in the Southern Hemisphere. Changes in the westerly wind in the middle latitudes are also referred to as “zonal flow variations” and defined using a “zonal index”.