东亚500hpa月平均高度场的切比雪夫系数与南方涛动的耦合振荡关系

气象要素场通常可以通过多种方法,如经验正交函数,切比雪夫正交多项式等,分解成若干典型气象要素场。后者已由规则格点推广到不规则格点1]。张家诚2]、陈玉琼3]等先后探讨了长江中下游降水和温度与东亚500hPa月平均高度场的切比雪夫正交多项式系数（以下简称为切比雪夫系数）的关系,作者也分析了我国西北地区夏季干、湿状况与东亚经向环流指数（A₁₀）之间的联系4]。但是,就东亚500hPa月平均高度场切比雪夫系数本身气候振荡的研究仍涉及不多。而这一方面的研究对于加深了解我国大范围的气候异常是有益的。 

ON THE COUPLINGS BETWEEN CHEBYSHEV COEFFICIENTS AS DERIVED FROM THE MONTHLY MEAN GEOPOTENTIAL FIELDS AT 500hPa OVER EAST ASIA AND THE SOUTHERN OSCILLATION

The first six Chebyshev polynomial coefficients (i. e. , A₀₀, A₀₁, A₁₀, A₁₁, A₀₂, A₂₀) were derived from monthly mean geopotential height over East Asia for the period 1951 - 1983. Spectral analysis of these coefficients revealed relative maxima of power in the frequncy bands of 200 months (~16. 7 years), 25 months (the quasi-biennial oscillation), 5-6 months, and 2-3 months. Cross-spectal characteristics between chebyshev coefficients and the Southern Oscillation Index (SOI) were also explored. Coherency spectrum for the zonal (A₀₁) and meridional (A₁₀) circulation index with the SOI was significant near 4 years, the QBO, and 2-3 months. Some physical reasons were offered for the spatial linkages (i. e. , teleconnections) between the SO and atmospheric circulation anomalies over East Asia.