中文摘要：

利用NCEP/NCARR2逐日再分析资料和西南地区气象台站逐日气温资料,通过带通滤波、小波分析、相关分析和合成分析等统计方法,研究了2010年东亚冬季风月内尺度振荡特征及其与西南地区冬季气温的联系。结果表明,2010年东亚冬季风在月内时间尺度上主要存在7天左右、12天左右以及30天左右为主要振荡周期的低频振荡。东亚冬季风月内尺度,准1周、准2周时间尺度内的振荡特征可以很好指示出同期西南地区较强的低温过程,且在准2周尺度比准1周尺度对西南地区冬季低温的影响更明显。月内尺度、准1周、准2周尺度上东亚冬季风正、负位相时,无论是对流层高层、中层、低层环流场分布形势均有显著差别,当东亚冬季风正位相时对流层从高层到低层环流场形势均有利于西南地区冬季低温,而负位相时环流形势相反,不利于西南地区低温。

英文摘要：

Using NCEP/NCAR R2 reanalysis daily data and daily meteorological observational data in southwest China in 2010, this paper studied the submonthly timescale oscillation characteristics of the East Asian winter monsoon （EAWM） and its effect on the temperature in southwest China in 2010 by bandpass filtering, wavelet transformation, composite analysis and correlation analysis. The main conclusions are as follows： The EAWM in 2010 was dominated by low-frequency oscillations of about 7 -, 12 -, and 30-day periods. There existed obvi- ously negative correlation between the EAWM and the winter temperature in southwest China on submonthly, quasi-weekly and quasi-biweekly timescales, and negative correlation is more obvious on the quasi-biweekly than the quasi-weekly timescale. There existed significant difference in the distribution of high, middle and low layer of the troposphere when the EAWM was on the submonthly, quasi-one-week and quasi-two-week times- cales in the positive and negative phase. In the positive EAWM phase, the upper-level subtropical westerly jet is stronger and the East Asia trough is deeper, thus favorable for the dominance of more powerful north wind and lower temperature in southwest China. On the contrary, in the negative EAWM phase, the upper-level subtropical westerly jet is weaker and the East Asia trough is shallower, thus unfavorable for the north wind and lower temperature in southwest China.