摘要
该文利用海平面气压场资料，计算了１８７３～１９９０年的东亚冬季风强度指数，并用滑动ｔ检验和奇异谱分析方法（ＳＳＡ）对近百年的东亚冬季风的突变性和周期性进行了研究．研究表明：东亚冬季风强度具有显著的年际及年代际变化．当冬季风强时，中国大部分地区温度降低，蒙古高压升高，阿留申低压加深．当冬季风弱时，天气及环流特点几乎与之相反．东亚冬季风存在ＱＢＯ、ＬＦＯ和ＩＤＯ现象，各振荡分量都具有年代际的差别．
Based on mean sea level pressure(MSLP) data, the East Asian winter monsoon intensity indexes were calculated from 1873 to 1990. The sudden and periodic changes of East Asian winter monsoon were studied by the method of sliding t test and singular spectral analysis(SSA). The results show that East Asian winter monsoon intensity displays obvious interannual and interdecadal variations. When winter monsoon increases, the temperature in the most regions of China decreases. Mongolian high raises and Aleutian low deepens, and reverse in weak winter monsoon year. Meanwhile, East Asian winter monsoon shows quasi biennial oscillation(QBO), low frequency oscillation(3～7 years) and interdecadal oscillation(more than 10 years). These three periodic oscillations appear to have strong interdecadal variability.
出处
《应用气象学报》
CSCD
北大核心
1999年第1期1-8,共8页
Journal of Applied Meteorological Science
基金
国家自然科学基金
关键词
东亚冬季风
年际变化
突变性
周期性
季风
East Asian winter monsoon Interannual variation Interdecadal variation
