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《Journal of Tropical Meteorology》 2016-05
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COMPARATIVE ANALYSIS OF ATMOSPHERIC AND OCEANIC CONDITIONS BEFORE THE OCCURRENCE OF TWO TYPES OF EL NIO EVENTS

XU Shu-wen;ZHI Xie-fei;WANG Xiao-chun;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,NUIST;Nantong Marine Environmental Monitoring Center;Key Laboratory of Meteorological Disaster of Ministry of Education-KLME,NUIST;School of Atmospheric Science,NUIST;School of Marine Science,NUIST;Jiangsu Engineering Technology Research Center of Marine Environment Detection,NUIST;  
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 only 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 thermocline 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.
【Fund】: 国家自然科学基金(41328006);; 南京信息工程大学启动基金(S8113046001);; 公益性行业(气象)科研专项(GYHY201506032)2015江苏双创团队;; 江苏高校优势学科建设工程资助项目(PAPD);; 江苏省“青蓝工程”(东亚季风与区域气候变化)共同资助
【CateGory Index】: P732
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