气象科学2017，Vol.37Issue(1)：70-77,8.DOI:10.3969/2016jms.0018
东北冷涡下辽宁省短时强降水统计与合成分析
Statistical and composite analysis on short-time heavy rainfall of Liaoning province under Northeast China cold vortex
摘要
Abstract
By using the conventional data,FNL data and hourly precipitation data in Liaoning province from June to August during 2000-2014,the Northeast China Cold Vortex(NCCV) was divided into north vortex,middle vortex,and south vortex,and the short-time heavy rainfall characteristics of each cold vortex were statistically studied and dynamically analyzed.Results show that there were 755 times of short-time heavy rainfalls,only 227 times happened under the background of NCCV during 1 to 3 hours.Steered most by middle vortex in June,heavy rainfall is collectively affected by both middle vortex and north vortex in July and August with a certain periodic variation.Moreover,north vortex has abundant moisture transportation while middle vortex is opposite.The combination of shear convergence field and vapor transportation plays an important role in severe precipitation.The precipitation near cold vortex center is likely to occur in the north of baroclinic zone and left to where upper level jet exits,while rain in front or behind trough is located in the south of baroclinic zone and right to where upper level jet enters,and the secondary circulation resulting from upper level jet exists in precipitation area within baroclinic zone.The cyclonic circulation induced by high potential vorticity triggers ascending movement of rainfall near cold vortex center,combined with obvious activity of dry intrusion in the rainfall area behind trough.关键词
东北冷涡/短时强降水/统计特征/动态合成分析/位涡Key words
Northeast China cold vortex/Short-time heavy rainfall/Statistical characteristics/Dynamic composite analysis/Potential vorticity分类
天文与地球科学引用本文复制引用
李爽,丁治英,刘云桦,田璐..东北冷涡下辽宁省短时强降水统计与合成分析[J].气象科学,2017,37(1):70-77,8.基金项目
国家重点基础研究发展计划“973”(2013CB430103) （2013CB430103）
国家自然科学基金资助项目(41530427,41375058) （41530427,41375058）
