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The North Atlantic Oscillation and its relationship with near surface temperature
Author(s) -
Slonosky Victoria C.,
Yiou Pascal
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012063
Subject(s) - north atlantic oscillation , climatology , atlantic multidecadal oscillation , secular variation , arctic oscillation , surface air temperature , mode (computer interface) , environmental science , global warming , period (music) , climate change , geography , geology , oceanography , northern hemisphere , physics , acoustics , geophysics , computer science , operating system
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.