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| Large-Scale Circulation Features Typical of Wintertime Extensive and Persistent Low Temperature Events in China |
| BUEH Cholaw,FU Xian-Yue,XIE Zuo-Wei |
1International Center for Climate and Environment Sciences (ICCES), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
2 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;1 International Center for Climate and Environment Sciences (ICCES), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;1 International Center for Climate and Environment Sciences (ICCES), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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Abstract A pair of northeast-southwest-tilted midtropospheric ridges and troughs on the continental scale was observed to be the key circulation feature common among wintertime extensive and persistent low temperature events (EPLTE) in China. During the persistence of such anomalous circulations, the split flow over the inner Asian continent and the influent flow over the southeastern coast of China correspond well to the expanded and amplified Siberian high with tightened sea level pressure gradients and hence, a strong, cold advection over southeastern China. The western Pacific subtropical high tends to expand northward during the early stages of most EPLTEs.
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Received: 27 May 2011
Revised: 27 May 2011
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