安徽农业科学2011，Vol.39Issue(34)：21303-21306,21310,5.
宁夏降水空间分布格局及其多时间尺度变化特征分析
Characteristics of Spatial Structural Patterns and Temporal Variability of Annual Precipitation in Ningxia
摘要
Abstract
[Objective] The aim was to study the characteristics of the spatial structural patterns and temporal variability of annual precipitation in Ningxia. [Method] Using empirical orthogonal function rotated empirical orthogonal function, the precipitation concentration index, morlet wavelet analysis and Mann-Kendall rank statistic method, the characteristics of precipitation on the spatial-temporal variability and trend were analyzed by the monthly precipitation series in Ningxia during 1951 -2008. [Result] In Ningxia, the spatial structural patterns of annual precipitation appeared " North-south type" and " North-middle-south type". It increased from north to south, the changes of inter-annual precipitation decreased from north to south. Precipitation changed significantly in month and distributed no uniform for the intra-annual in the Yellow river irrigation area. But it was conversely in mid arid zone and mountainous area of southern Ningxia. The probability of single abundant precipitation year is higher than single short precipitation year and the continuous short precipitation year is higher than continuous abundant precipitation year. The main cycles are 3a, 6a and 10a approximately. In the mid arid zone and the mountainous area of southern Ningxia , the probability of precipitation reduction was about 75.0% and the Yellow river irrigation area, 71.4% , respectively. The reduction in the entire area was about 73.3%. The annual precipitation in the middle arid area and irrigation area was increasing. The variability would change slowly for the intra-annual distribution of precipitation. Especially, the reduction tendency rate in the middle arid area reached 100. 0%. [ Conclusion ] The study provided references for the effective utilization of the local precipitation, and the coordinated development of the regional social economy and ecological environment.关键词
降水/空间格局/多时间尺度/时间演变/趋势分析/宁夏Key words
Precipitation/Spatial structural patterns/ Multiple-time scale/ Temporal variation/ Trends analysis/ Ningxia分类
天文与地球科学引用本文复制引用
徐利岗,汤英,杜历,鲍子云..宁夏降水空间分布格局及其多时间尺度变化特征分析[J].安徽农业科学,2011,39(34):21303-21306,21310,5.基金项目
宁夏回族自治区自然科学基金(NZ10215) （NZ10215）
国家科技支撑项目(2011BAD29B07) （2011BAD29B07）
宁夏回族自治区自然科学基金(NZ10214). （NZ10214）
