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COMPARATIVE ANALYSIS OF ATMOSPHERIC AND OCEANIC CONDITIONS BEFORE THE OCCURRENCE OF TWO TYPES OF EL NIO EVENTS
Author(s): 
Pages: 668-677
Year: Issue:  5
Journal: Journal of Tropical Meteorology

Keyword:  EP El Ni?oCP El Ni?oequatorial zonal windthermoclineMJO;
Abstract: The atmospheric and oceanic conditions before the onset of EP El Nio and CP El Nio in nearly 30 years are compared and analyzed by using 850 hPa wind,20 ℃ isotherm depth,sea surface temperature and the Wheeler and Hendon index.The results are as follows:In the western equatorial Pacific,the occurrence of the anomalously strong westerly winds of the EP El Nio is earlier than that of the CP El Nio.Its intensity is far stronger than that of the CP El Nio.Two months before the El Nio,the anomaly westerly winds of the EP El Nio have extended to the east Pacific region.In contrast,the westerly wind anomaly of the CP El Nio can on-ly extend (develop)to the west of the dateline.Unlike the EP El Nio,the CP El Nio is always associated with easterly wind anomaly in the eastern equatorial Pacific before its onset.The thermocline depth anomaly of the EP El Nio can significantly move eastward and deepen.In addition,we also find that the evolution of ther-mocline is ahead of the development of the sea surface temperature for the EP El Nio.The strong MJO activity of the EP El Nio in the western and central Pacific is earlier than that of the CP El Nio.Measured by zonal wind square in the 30 ~60 d band,the intensity of MJO activity of the EP El Nio is significantly greater than that of the CP El Nio before the onset of El Nio.
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