摘要
采用统计方法结合气象台站历史沿革信息,对1910—2010年洞庭湖区逐月降水量观测资料进行均一化处理,并利用洞庭湖周边气象台站资料对洞庭湖区1951年以前缺测的降水资料进行插补,构成完整均一的降水序列。在此基础上,构建洞庭湖区近百年降水序列并分析其变化特征。结果表明:1910—2010年洞庭湖区年及春、夏、秋三季降水量的变化趋势不显著,冬季降水量呈显著上升的趋势;年降水量存在准3、6、8 a和20 a等多时间尺度的振荡周期;小波分析显示,近百年洞庭湖区年降水量和冬季降水量均存在显著增多的突变。
Based on historical information of weather stations,daily precipitation series data in each weather station of Dongting Lake region during 1910 to 2010 were tested for their homogeneity by a statistical method.The miss-ing data before 195 1 were interpolated by surrounding weather stations in order to get a complete and homogene-ous series.Precipitation series in the recent 100 years were then rebuilt and its change characteristics were ana-lyzed.The results indicate that annual precipitation in Dongting Lake region during 1910 to 2010 has not a signifi-cant trend,so is in spring,summer and autumn,while precipitationin winter is in a significant increasing trend. There are different cycles with 3 years,6 years,8 years and 20 years for annual precipitation over Dongting Lake region.Wavelet analysis suggests that annual precipitation has an abrupt increasing change,so is winter precipitati-on.
出处
《气象与环境学报》
2015年第3期63-68,共6页
Journal of Meteorology and Environment
基金
公益性行业(气象)科研专项(GYHY201406016)资助
关键词
洞庭湖区
降水序列构建
小波分析
Dongting Lake region
Construction of precipitation series
Wavelet analysis
