On Monday, Jan 31, I will give my first lecture of the semester. The Course OCN310 is for undergraduate students at U. Hawaii, and the lecture on "Climate Variability" usually covers ENSO (El Nino-Southern Oscillation) and PDO (Pacific Decadal Oscillation). One tends to start such a lecture with a picture showing fire burning over Australia, a typical case during El Nino, but not this time. I will start with "Climate Change" vs. "Weather" that we experience daily (since a senior-citizen student asked me this question last week). Then, I will use a photo from "2010-2011 Queensland Floods" to lead to ENSO, and a weather map for Jan. 31 (indicating snow storm for US's midsection) to explain briefly the impact of negative AO (Arctic Oscillation) Index ...
GEOPHYSICAL RESEARCH LETTERS, VOL. 37, L14703, 6 PP., 2010 doi:10.1029/2010GL043830 Northern Hemisphere winter snow anomalies: ENSO, NAO and the winter of 2009/10 R. Seager Lamont Doherty Earth Observatory, Earth Institute at Columbia University, Palisades, New York, USA Y. Kushnir Lamont Doherty Earth Observatory, Earth Institute at Columbia University, Palisades, New York, USA J. Nakamura Lamont Doherty Earth Observatory, Earth Institute at Columbia University, Palisades, New York, USA M. Ting Lamont Doherty Earth Observatory, Earth Institute at Columbia University, Palisades, New York, USA N. Naik Lamont Doherty Earth Observatory, Earth Institute at Columbia University, Palisades, New York, USA 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 Nio 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 Nio event were responsible for the northern hemisphere snow anomalies of winter 2009/10. Received 1 May 2010; accepted 22 June 2010; published 24 July 2010. Citation: Seager, R., Y. Kushnir, J. Nakamura, M. Ting, and N. Naik (2010), Northern Hemisphere winter snow anomalies: ENSO, NAO and the winter of 2009/10, Geophys. Res. Lett., 37, L14703, doi:10.1029/2010GL043830. To download the paper, click pdf file.
标签: ENSO
