SVD法在广西秋冬季旱涝分析中的应用

Application of SVD method to analysis of drought/flood in autumn and winter in Guangxi

应用奇异值分解(SVD)方法,分析了500hPa高度场在广西秋季和冬季旱涝年的气候差异,分析结果表明:冬季前期500hPa高度场SVD分解的第一模态收敛速度比秋季快,但两个季度第一、第二奇异向量的累积方差都在60%以上,可见两个季度第一、第二奇异向量对应的SVD模态是最主要的SVD模态,代表了两要素场相互作用的主要特征。

Using singular value decomposition （SVD） method, the climate difference of 500hPa height field were analyzed for Guangxi in the autumn and winter draught/flood years. Results show that the convergence velocity of first mode in singular value decomposition of earlier 500hPa height field in winter is faster than that in Autumn, but the accumulative variance of the first and second singular vectors for two seasons all be over 60%. Therefor, the SVD modes corresponding to first and second singular vectors of two seasons are the predominant modes and reflect the main features of interaction between two element fields.