摘要
基于吉林省西部7个测站1960~2011年共52年的年平均降水量资料,采用线性倾向估计、滑动平均、累积距平、谐波分析、Mann-Kendall法、滑动t检验法等方法,分析了吉林省西部降水量随时间分布的演变特征及趋势。结果表明,吉林省西部年平均降水量突变点在1992年,降水量趋势由增加转为减少,但总体呈下降趋势,降水量下降程度由大到小为长岭站〉双辽站〉大安站〉通榆站〉白城站〉乾安站〉前郭站;降水主要集中在夏季,降水量年代际、年际分量有减少趋势,存在2~3年的年际变化周期,共经历了3个比较明显的年代际变化,且降水量丰枯强度和时间对称出现。
Based on the annual average precipitation data during 1960 -2011 at 7 survey stations in western Jilin Prov- ince, temporal distribution features and trends are studied by using the methods of linear trend calculation, moving aver- age, cumulative anomaly, harmonic analysis, Mann-Kendall method, slide t-test. The results show that the sudden change of annual average precipitation occurred at 1992, the trend of precipitation appeared in the decline in western Jilin Province. The decrease degree of precipitation ranks the descending sort as follows： Changling, Shuangliao, Daan, Tongyu, Baicheng, Qianan, Qianguo. Precipitation mainly concentrates in the summer. Interdecadal and interannual component of precipitation appear downward trend, it has 2-3 years interannual cycle. There are 3 obvious interdeeadal changes. The intensity and time of wet-dry appears symmetrically.
出处
《水电能源科学》
北大核心
2015年第6期11-14,18,共5页
Water Resources and Power
基金
吉林省自然科学基金项目(20140101164JC)
吉林省科技厅重点攻关项目(20100452)
关键词
吉林省西部
降水量
演变特征
趋势分析
western Jilin Province
precipitation
evolution characteristics
trend analysis
