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《Scientia Meteorologica Sinica》 2010-03
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Relation of Middle East jet stream and China climate anomaly in winter

Ni Donghong1 Sun Zhaobo1 Li Zhongxian1,2 Zeng Gang1,3 Deng Weitao1 (1 Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing Univerity of Information Science & Technology,Nanjing 210044,China)(2 LASG,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China) (3 CMA Guangzhou Institute of Tropical Marine Meteorology,Guangzhou 510080,China)  
By using the monthly NCEP/NCAR reanalysis data and precipitation and temperature data of 160 stations over China,the relation of the Middle East jet stream(MEJS) and winter climate anomaly in China is studied.The results show that when the MEJS intensifies and shifts southeastward,the 200 hPa westerlies strengthen over the Bay of Bengal,Indo-China Peninsula and South China Sea,and weaken over north China north to 30°N,combined with decreased East Asia jet stream;at 500 hPa,the West European Ridge increases and the East European Trough deepens associated with the deepened southern Branch Trough over the north of the Bay of Bengal and the decreased East Asian trough,which contributes to frequent southeastward intrusions of the cold air from central eastern Europe to southwest China;the 850 hPa southwest wind anomaly intensifies over Myanmar,the Indo-China Peninsula and south China coast,which contributes to water vapor transport from the Bay of Bengal to south China;all the above atmospheric circulation anomalies result in the significant precipitation increasing in South China,and the temperature decreasing(increasing) in the the upper reaches of Yangtze River(northeast China),especially the significant temperature decreasing in southwest China;and vice versa.
【Fund】: 国家自然科学基金(4090504540775059);; 中国科学院LASG开放课题;; 广州热带海洋气象研究所热带基金(200806)
【CateGory Index】: P434
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