摘要
A pair of northeast-southwest-tilted mid-tropospheric ridges and troughs on the continental scale was observed to be the key circulation feature common among wintertime extensive and persistent low tempera-ture 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 southeast-ern 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 south-eastern China.The western Pacific subtropical high tends to expand northward during the early stages of most EPLTEs.
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 south- eastern China. The western Pacific subtropical high tends to expand northward during the early stages of most EPLTEs.
基金
supported by the National Key Technologies R&D Program of China (Grant No.2009BAC51B02)
