中国降水场QBO分布型态及其长期变率特征
THE DISTRIBUTION PATTERNS AND LONG TERM VARIABILITY FEATURES FOR QBO OVER RAINFALL FIELD OF CHINA
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摘要: 采用带通滤波法,奇异谱分析(SSA)和小波分析(WTA)综合研究了近50年中国降水场的准两年周期振荡(QBO)的分布型态及其长期变率特征。结果表明,QBO分量在中国降水场年际振荡中举足轻重,具有显著而稳定的特征:50年代到60年代初期,QBO分量振幅较大,频率较小;60年代中后期到70年代初,振幅有所衰减,频率有所加大;70年代中后期到80年代直至90年代初,频率再次减小,振幅也相对较小;90年代中期,振幅和频率都有增大的趋势。准两年振荡在不同季节主型态中表现有所不同,在冬、夏季表现较强,秋季次之,春季最弱。Abstract: The distribution pattern and long term variability of QBO rainfall field of China are comprehensively studied by using belt-pass filtering, singular spectrum analysis (SSA) and Wavelet analysis (WTA). The results shows that QBO components of precipitation field over the region of China have important role and significant and stable features, which are as follows: the amplitude was larger but frequency was low during 1950～1960's;the amplitude decreased but the frequency increased from middle range of 1960's to start of 1970's;the frequencies again decreased and amplitudes also decreased from the late 1970's to early 1990's;the amplitude and frequency had a rise trend. On the other hand, the above facts are different in different seasons.
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