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《Journal of Chengdu University of Information Technology》 2012-03
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Comparison and Analysis of the Characteristic Indexes of Summer Subtropical Westerly Jet Stream Over East Asia

YAN Cai-xia1,JIN Rong-hua2(1.Chengdu University of Information Technology,Chengdu 610225,China;2.Chinese Academy of Meteorological Sciences,Beijing 100081,China)  
In order to provide scientific basis for investigators and operation departments to use a variety of methods to characterize East Asian subtropical westerly jet(EASWJ) reasonably.Using the reanalysis data during 1960~2009 from NCEP/NCAR and China 714 stations daily precipitation data(Beijing time),taking cases in 2005 for example,characteristic indexes of EASWJ are studied,retrieved numerically and compared based on summary of existing objective,quantitative EASWJ methods.The results show that: there are many methods to characterize the position index such as axis index method,EOF decomposition method and Regional wind speed difference method.The axis index method is defined reasonable,simple,and has clear physical meaning and intuitive performance.It applies to daily real-time monitoring and diagnostic analysis.EOF and Regional wind speed difference method apply to Climate Assessment and Seasonal diagnosis;there are two methods,Regional wind speed and the central intensity,to characterize the intensity index.They are fit to daily real-time monitoring and Circulation observation and have good meaning to Rainfall amount of the middle and lower reaches of the Yangtze River and North China.The methods are objective and quantificational,simple,clear meaning,and good indicative.At the same time,we point that based on what merits and demerits of these EASWJ indexes have,investigators and operation departments should apply EASWJ indexes better if they can select compatible one or improve and innovate a method according to there selves practice.
【Fund】: 中国气象局气象新技术推广资助项目(CMATG20092D02);; 公益性行业(气象)科研专项资助项目(GYHY(QX)GYHY200906007);; 科技部国家科技支撑计划资助项目(2009BAC51B03)
【CateGory Index】: P442
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