Northern Hemisphere winter snow anomalies: ENSO, NAO and the winter of 2009/10

Winter 2009/10 had anomalously large snowfall in the central parts of the United States and in northwestern Europe. Connections between seasonal snow anomalies and the large scale atmospheric circulation are explored. An El Niño state is associated with positive snowfall anomalies in the southern an...

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Bibliographic Details
Published in:Geophysical research letters 2010-07, Vol.37 (14), p.n/a
Main Authors: Seager, R., Kushnir, Y., Nakamura, J., Ting, M., Naik, N.
Format: Article
Language:English
Subjects:
Atmospheric circulation
Atmospheric sciences
Climate change
Earth sciences
Earth, ocean, space
El Nino
ENSO
Exact sciences and technology
NAO
Ocean-atmosphere interaction
Precipitation
Snow
Winter
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Summary:Winter 2009/10 had anomalously large snowfall in the central parts of the United States and in northwestern Europe. Connections between seasonal snow anomalies and the large scale atmospheric circulation are explored. An El Niño state is associated with positive snowfall anomalies in the southern and central United States and along the eastern seaboard and negative anomalies to the north. A negative NAO causes positive snow anomalies across eastern North America and in northern Europe. It is argued that increased snowfall in the southern U.S. is contributed to by a southward displaced storm track but further north, in the eastern U.S. and northern Europe, positive snow anomalies arise from the cold temperature anomalies of a negative NAO. These relations are used with observed values of NINO3 and the NAO to conclude that the negative NAO and El Niño event were responsible for the northern hemisphere snow anomalies of winter 2009/10.
ISSN:0094-8276
1944-8007
DOI:10.1029/2010GL043830