10B.2
Two types of El Niņo and their related atmospheric and oceanic dynamics

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Wednesday, 26 January 2011: 4:15 PM
Two types of El Niņo and their related atmospheric and oceanic dynamics
609 (Washington State Convention Center)
Hanna Na, Seoul National University, Seoul, South Korea; and K. Y. Kim and B. G. Jang

Recent extensive studies on two types of El Niņo, the Eastern-Pacific (EP) and Central-Pacific (CP) types, have led to a need for an in-depth understanding of their differences. Their related atmospheric and oceanic dynamics are investigated during 1958-2007 by using various datasets such as the Extended Reconstruction of Historical Sea Surface Temperature version 3 (ERSST V3), Atmospheric Model Intercomparison Project (AMIP) SST, and Simple Ocean Data Assimilation Reanalysis (SODA). Physically consistent patterns of wind stress, sea surface height, vertical structures of subsurface temperatures, salinity and currents in the upper tropical Pacific with each type of El Niņo are obtained using the Cyclostationary Empirical Orthogonal Function (CSEOF) technique and multiple regression analysis. Comparisons between them allow us to better understand the atmospheric and oceanic dynamics related to the different types of El Niņo. Recent increase of occurrence frequency of the CP El Niņo will also be discussed.