2007/2008年冬季中国南方低温雨雪天气期间大气准双周振荡作用分析

利用NCEP/NCAR逐日格点资料和中国气象局气象信息中心提供的727站逐日降水资料,从低频振荡角度对2007/2008年冬季中国南方低温雨雪期间的环流背景和气象要素场做了分析。分析结果表明,准双周振荡是2007/2008年冬季中国南方低温雨雪期间大气变化的重要模态。通过对低频振荡的传播分析得到：10～20 d低频波由...

Influence Analysis of Quasi-biweekly Oscillation During the Low Temperature,Rain and Snow Weather in South China in 2007/2008 Winter

By using daily NCEP/NCAR data and daily precipitation data for 727 stations supplied by National Meteorological Information Center,we analyzed the circulation background and the meteorological element field during the low temperature,rain and snow weather in South China in 2007/2008 winter from the low frequency oscillation perspective.The results show that,quasi-biweekly oscillation（QBWO） is an important mode of atmosphere variability during the low temperature,rain and snow weather in South China in 2007/2008 winter.By the propagation analysis of the low frequency oscillation,we know that 10-20 day low frequency wave propagates to the Bengal Bay from West Asia and the East African coast,and converges in the front of the southern branch trough,influencing the circulation of South China and resulting in precipitation in advance.