大气科学2017，Vol.41Issue(1)：202-212,11.DOI:10.3878/j.issn.1006-9895.1602.15231
初夏东北地区冷涡降水“累积效应”
"Cumulative Effect" of Cold Vortex Precipitation in Northeast China in Early Summer
摘要
Abstract
Using precipitation observations in Northeast China (NEC) in May and June from 1960 to 2012,an objective identification method for cold vortex activity in NEC is applied to analyze the cold vortex activity in NEC and its impact on cold vortex precipitation in early summer.Results show that periodicity of the cold vortex activity from May to June is 3-7 days with the character of frequent occurrence,and the precipitation induced by the cold vortex accounts for 62.5％ of the total rainfall in NEC.A cold vortex monthly rainfall intensity index is defined,which is consistent with the interannual variability of monthly rainfall in the same period.Early summer precipitation pattern in NEC is similar to the leading mode of EOF decomposition of cold vortex precipitation.The first two leading modes of EOF decomposition present a pattern similar over the entire NEC and a pattern that is contrary in the northeast and southwest of the NEC,respectively.The two leading modes account for 46.8％ and 42.7％ of the total variance,respectively.The concept of "Cumulative Effect" of cold vortex precipitation (CECEP) is proposed.The CECEP can reflect the characteristics of spatial distribution of summer precipitation anomaly in NEC in general,and further reveal the climatological characteristics of the cold vortex activity.关键词
东北冷涡/降水指数/东北地区/初夏降水/EOFKey words
Cold vortex in Northeast China/Precipitation index/NEC (Northeastern China)/Early summer precipitation/EOF分类
天文与地球科学引用本文复制引用
刘刚,封国林,秦玉琳,曾宇星,杨旭,姚帅..初夏东北地区冷涡降水“累积效应”[J].大气科学,2017,41(1):202-212,11.基金项目
国家自然科学基金项目41405094、41375078、41630424、41275096,吉林省科技发展计划项目20150204023SF （）
National Natural Science Foundation of China (Grants 41405094,41375078,41630424,41275096),Scientific and Technological Developing Scheme of Jilin Province (Grant 20150204023SF) （Grants 41405094,41375078,41630424,41275096）
