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在国家气象局提供的北京市近53 a降水资料的基础上,利用统计学的方法分析了降水系列的年际变化和年内分布特征、趋势成分分析以及自相关分析,分析结果表明:北京市多年平均降水量为603 mm(1951—2003年),并以1.58 mm/a的速率在减少;降水年内分布比较集中,主要集中在6—8月,但这3个月占全年的降水量的比例在逐渐减少;由自相关分析得出北京市降水量系列是相对独立的系列,相依性弱。
Based on the precipitation data of Beijing in the past 53 years provided by the National Meteorological Bureau, the statistical analysis was used to analyze the interannual variability of precipitation series, the distribution characteristics during the year, the trend component analysis and the autocorrelation analysis. The results show that for many years The average precipitation was 603 mm (1951-2003) and decreased at a rate of 1.58 mm / a. The distribution of precipitation was mainly concentrated in June-August during the year, but the annual precipitation in the past three months The proportion is gradually decreasing; the autocorrelation analysis shows that the series of precipitation in Beijing is a relatively independent series, and its dependence is weak.