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

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

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3714703s&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 14, CiteID L14703

Physics

15

Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Precipitation (1854), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504)

Scientific paper

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.

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