气象Issue(2)：183-191,9.DOI:10.7519/j.issn.1000-0526.2016.02.006
浙江省冬季不同霾过程的后向气流轨迹及环流特征
Backward Trajectory and Circulation Features in Different Haze Processes in Winter of Zhejiang
摘要
Abstract
Based on available observation data of Zhejiang Province for the period from 1981 to 2013,tem-poral and spatial distribution characteristics of winter haze in Zhejiang Province were analyzed.The results show that haze days have increased significantly since the mid-1980s.Haze days in the northern and west-ern part of the province are much more than the south and the east,also more in the basin and plain than on the hills and islands.The division of the haze distribution pattern is obtained according to the K-means clustering analysis,which shows the pattern can be divided into two categories.The first category ac-counts for 62% of the total haze,most of which happens in December,while most of the second category usually appears in January and December.In the end,according to the NCEP/NCAR reanalysis data,the different atmospheric circulation features,including the strength of cold high,vertical velocity and the dis-tribution of water vapor,are discussed for the two kinds of haze patterns respectively.It is found that Zhe-jiang Province is controlled by cold high from northern China and the sinking airflow in the first haze pat-tern.In the second haze pattern,however,the cold high has transformed,and the sinking flow is also weakened,which makes air move slowly,so it is hard for pollutants to dissipate.关键词
冬季霾/气候特征/K-均值聚类/后向气流轨迹Key words
winter haze/climate characteristic/K-means cluster/backward trajectory分类
天文与地球科学引用本文复制引用
翁之梅,李丽平,杨万裕,刘力源..浙江省冬季不同霾过程的后向气流轨迹及环流特征[J].气象,2016,(2):183-191,9.基金项目
台州市社会发展科技项目（14SF01）和国家重点基础研究发展计划（973计划）（2015CB453200）共同资助 （）
