The North Atlantic Oscillation and its relationship with near surface temperature

Details The North Atlantic Oscillation and its relationship with near surface temperature The North Atlantic Oscillation and its relationship with near surface temperature

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..807s&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 5, p. 807-810

Physics

10

Global Change, Global Change: Climate Dynamics, Meteorology And Atmospheric Dynamics: Climatology, Meteorology And Atmospheric Dynamics: General Circulation

Scientific paper

A new NAO index is presented here using homogenized surface pressure data from Reykjavik and Gibraltar (for November to March) and Reykjavik and Ponta Delgada (for April to October). This index suggests that the positive trend in recent years is not unprecedented, as the early 20th century was also a period of persistently positive NAO values. The relationship between the secular warming trend and the influence of the NAO on near-surface temperatures over the North Atlantic region and surrounding land masses is examined on a seasonal basis using standardized temperature anomalies since 1900. The near-surface temperature field separates into two independent modes, which we designate a ``warming'' mode and dynamic (``NAO'') mode, with distinct seasonal cycles.

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