摘要
本文从实际资料出发,分析旱涝指数场经验正交展开的稳定性。结果表明:旱涝指数分布典型场的变化,在过去的500多年中并无明显的长期趋势和周期性。同时指出,典型场结构的稳定性随典型场序号的增大而减小,而典型场特征值的稳定性却随序号的增大而增大。而且指出,从典型场结构和方差贡献的稳定性角度来考虑,有明显统计气候意义的旱涝指数典型场不过4—5个。
Based on observational data, the stability in the empirical orthogonal expansion of the drought and flood indexes is analyzed, Results show that there have been no significant long-term trend and periodic oscillation in the eigenvectors during the last 500 years. It is also found that the stability in the structure of the eigenvectors decreases with their orders, whereas that in the characteristic value of the eigenvectors increases with their orders. Considering the stability in the spatial structure and variance contribution of the eigenvectors, only the first 4-5 eigenvectors are of climatological significance
出处
《南京气象学院学报》
CSCD
1990年第3期266-273,共8页
Journal of Nanjing Institute of Meteorology
