陕西省多年月潜在蒸发量和降水量的随机特性

通过对陕西省部分县 (市 )的 2 0 a～ 40 a的潜在蒸发量和降水量的分析 ,研究了他们在时间上的相关性和随机特性 ,结果认为潜在蒸发量无论是均值还是方差都在时间上具有很高的相关性 ,而降水量的均值在时间上具有分段相关性 ,而方差不具相关性 ,通过进一步检验 ,潜在蒸发量在时间上属于 AR( 1 )模型。

By analysis of 20 to 40 years latency evaporation and precipitation in certain counties and cities in Shaanxi, their correlation and random characteristic in time are studied. The results show that latency evaporation s correlation characteristic of average value and variance is very apparent in time, but correlation characteristic of only precipitation s average value is comparatively high in periods of time. The farther result is that latency evaporation has AR(1) characteristic.