摘要
目的分析西安地区降水量变化。方法利用西安地区1951—2000年年降水量、月降水量资料,通过线性趋势法和累积距平曲线法,对西安地区近50年降水的变化特征进行分析。结果 20世纪50年代降水以偏多为主,60年代到70年代初期降水基本正常,变化小,70年代末期降水偏少,80年代初期降水偏多,80年代末期降水基本正常,90年代降水一直持续偏少。结论西安地区降水长期变化呈微弱的减少趋势,以20.42 mm/10 a的速率减少;汛期降水变化也呈减少的趋势,20世纪70年代减少趋势显著;降水的季节变化各季均呈减少趋势,秋季最为明显;年降水量无明显的突变。
Aim To analyze the change of the rainfall in Xi′an region.Methods For the data of annual and monthly rainfall from 1951 to 2000 in Xi′an Region,climatic linear trend and accumulated variance analysis methods are applied to analyze the rainfall in this region.Results The main findings in Xi′an Region can be listed as follow：the trends varied with time.Positive trends were detected in 1950s and early 1980s.Negative trends were observed in late 1970s and 1990s.Precipitation was normal from 1960s to early 1970s,as well as at the end of the 1980s,the changes were less.Conclusion The long-term overall trend of the summer precipitation in Xi′an Region decreased at a rate of 20.42mm per 10 years;rainfall change in flood reason decreased too,especially in 1970s;the seasonal rainfall reduced too,the most obvious season is the fall;and there was no abrupt change in yearly rainfall.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第1期139-144,共6页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学基金资助项目(407701019)
关键词
降水量
线性趋势
累积距平
西安
precipitation
climatic linear
accumulated variance
Xi′an
