近50a东北地区降水异常的气候特征分析
投稿时间: 2002-06-26  最后修改时间: 2002-10-10  点此下载全文
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作者单位
贾小龙 南京气象学院大气科学系, 江苏, 南京, 210044 
王谦谦 南京气象学院大气科学系, 江苏, 南京, 210044 
周宁芳 南京气象学院资源环境与城乡规划系, 江苏, 南京, 210044 
基金项目:国家自然科学基金项目(40233037);国家自然科学基金项目(40175021)
中文摘要:用诊断分析的方法对近50a东北地区降水异常的气候特征进行了分析。结果表明,东北地区降水异常的季节变化明显,异常在6—8月最大,尤其是7—8月,异常峰值所在月有较明显的年际变化;近50a东北地区夏季降水异常呈现出明显的年际和年代际变化特征,存在3.1a的显著年际周期和12.5a的显著年代际周期,同时还存在26~28a、4~6a的多尺度振荡周期;东北地区夏季多、少雨年全国降水异常的分布表现出了东北与华北东部同位相,与淮河及长江中下游地区反位相的特征。夏季降水异常的空间分布及与全国降水异常的分布既有一致的时候(50、70、90年代),也存在地域差异(60、80年代)。
中文关键词:东北地区  降水异常  季节变化  年代际变化  空间分布
 
Analysis of Climate Features of Precipitation Anomalies in Northeast China in Recent 50 Years
Abstract:Diagnostic method is used to analyze the climate features of precipitation anomalies in Northeast China in recent 50 years.Results indicate that precipitation of Northeast China has obvious seasonal change,with magnitude anomalies occurring in summer (June to August),especially in July and August and that the anomalies peak month has rather obvious decade change.In the recent 50 years,summer rainfall anomalies in the study area exhibit remarkable interannual(interdecadal) variation period of 3.1 years(12.5 years,26~28 years and 4~6 years).The distribution of rainfall anomalies in NE China is in(out of) phase with that in North China(the Huaihe River and the middle-low reaches of the Yangtze River.Distribution of summer precipitation anomalies of Northeast China shows consistence and is coherent to distribution of summer precipitation anomalies of China in 1950s,1970s and 1990s,there is area difference in 1960s and 1980s.
keywords:Northeast China  precipitation anomaly  seasonal variation  interdecadal variation  spatial distribution
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