北极冰盖对我国气温和降水的影响

利用滤波、扩展经验正交函数、谱分析及相关分析方法研究了北极冰盖面积与我国气温和降水的联系。北极冰盖面积的功率谱密度曲线表明，北极冰盖面积距平除存在半年和一年的周期变化，还存在准两年的周期变化，尤其在６、９、１１月份表现更加突出。冰盖面积的低频滤波曲线还表现出与全球性ＥＮＳＯ现象的密切联系。通过北极冰盖面积与我国月平均气温的ＥＥＯＦ分析，表明两者之间存在相当好的匹配关系，而且后期匹配更好。相关分析表

EFFECT OF ARCTIC ICE COVEK ON THE TEMPERATURE AND PRECIPITATION IN CHINA

Filtering technique. extended empirical orthogonal function (EEOF).spectrumand correlation analyses have been employed to study the relationship between Arctic ice cov-er(AIC)and monthly mean temperature and precipitation in China. The curve of power spec-trum density shows that not only a semi-annual and an annual oscillation but a quasi-biennial oscillation can be found in AIC area index anomaly. especially in June, September and Novem-ber.One can also see that there exists a close relation between the global ENSO events andAIC area low-frequency filtering curve. Analysis based on EEOF of AIC and the monthlymean temperature over China exhibits a good matching which is even better in the later peri-od.The correlation analysis indicates that the variation of AIC area has some influence on thetemperature and precipitation in subsequent months over China. In addition, it experiences aquasi-biennial low-frequency oscillation and displays some kind of propagation.