河南省春季降水量的时空分布

Space-time Distribution Analysis of Spring Precipitation in Henan

利用河南省分布均匀的60个测站1961 2006年春季降水量资料,采用线性趋势、多项式拟合、最大熵谱分析、EOF等方法对河南省春季降水量的年际、年代际变化及时空分布特征进行分析,结果显示:河南省春季降水量空间分布南北差异较大,呈现南多北少;春季旱年多于涝年,尤其4、5月偏旱的年份显著多于偏涝年;春季降水量的线性趋势不明显,年际变化具有显著的5 a振荡周期;春季及其各月降水量场第一特征向量呈现全省一致型,其方差贡献率达70%左右,全省春季同涝同旱特征显著。

Using the spring precipitation material collected from 60 observation stations which distributed homogeneously around the Henan province, we choose the linear trend method, polynomial fitting method, maximum entropy spectrum analysis and EOF method to analyze the characteristics of annual change, interannual change, spatial and temporal distribution of the spring precipitation in Henan province in detail.＂ The results show that the spatial distribution of rainfall in Henan province spring has a larger difference between North and South, and the North showed little more than the South. The spring drought year is more than the waterlogged year, especially in April and May the dry year obviously is more than the leaning waterlogged year. The linear trend of spring precipitation is not obvious, and the annual change has the remarkable five - year duration of oscillation. The spring and each month of precipitation field first characteristic vector present the entire province consistent, and its variance technical progress factor reaches about 70% , the entire province is remarkable with the waterlogging with the dry characteristic in spring.