119 The possible teleconnections between the two types of El Nino and the low-level jets in North America

Wednesday, 22 June 2016
Alta-Deer Valley (Sheraton Salt Lake City Hotel)
Shiyuan (Sharon) Zhong, Michigan State University, East Lansing, MI; and L. Yu, X. Bian, and W. E. Heilman

Low-level jets (LLJs) are frequent weather phenomena in many regions of North America and have profound impacts on precipitation and wind energy. We used a 31-year (1979-2010) three-hourly reanalysis dataset to examine the possible teleconnections between southerly LLJ activity in North America and the two dominant patterns of the equatorial Pacific Ocean sea surface temperature anomalies characterized by El Niño and El Niño Modoki. We show that El Niño and El Niño Modoki exert different effects on the jet activities and the results vary by region and by season. Overall, El Niño Modoki affects jet activity all year round, but El Niño's influence is limited mostly to cold season (October-March). El Niño Modoki induces larger changes in jet frequency, but El Niño's influence extends to cover larger regions. A better understanding of these possible teleconnections can be used to improve seasonal predictions of precipitation and wind energy resources in regions of North America.
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