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NORTH ATLANTIC OSCILLATIONClick to edit Master title style The NAO is the dominant mode of winter climate variability in the North Atlantic regionranging from central North America to Europe and much into Northern Asia. The NAO is a large scale seesaw in atmospheric mass between the subtropical highand the •polar Clicklow. The tocorresponding edit Masterindex varies textfrom stylesyear to year, but alsoexhibits a tendency to remain in one phase for intervals lasting several years.• Second level• Third level• Fourth level• Fifth levelWMODrought and Desertification Workshop, Alanya, 14-16 November 200621TSMS