污染物跨界输送对珠三角旱季霾的影响过程研究  

The Impact Process of Trans-boundary Transport of Pollutants on Haze in Dry Season in Pearl River Delta

作　　者：王安琪[1] 盛立芳[1,2] 曹子淇 王文彩[1] 孙即霖[1,2] 

机构地区：[1]中国海洋大学海洋与大气学院,山东青岛266100 [2]中国海洋大学海洋大气相互作用与气候实验室,物理海洋教育部重点实验室,山东青岛266100

出　　处：《湖南生态科学学报》2017年第1期20-30,共11页Journal of Hunan Ecological Science

基　　金：国家自然科学基金(编号:41675146)

摘　　要：利用EOF分析方法和HYSPLIT-4轨迹模式对珠江三角洲2005-2015年旱季共251个霾日的天气形势及气团后向轨迹进行聚类,分析了外源污染物跨界输送对珠三角旱季霾发生的影响过程.以2015年1月20日为典型霾日个例,从天气学和物质输送角度对该个例进行研究.结果表明,引起珠三角地区旱季霾发生的外源污染物主要来自珠三角以北的中国大陆地区.霾形成过程中,华北地区700 h Pa高压脊前负涡度平流对应海平面至850 h Pa均有一高压系统,高压东北向气流有利于污染物由从长三角地区输送至珠三角地区.长三角地区平均空气质量通量为负,有质量输出;珠三角地区平均空气质量通量为正,有质量输入.珠三角地区在高压影响的下沉气流控制下,Q矢量散度为正,污染物易积聚成霾.To deeply understand the impact process of trans-boundary transport of xenobiotic pollutants on haze in dry season,Empirical Orthogonal Function（EOF） and the HYSPLIT-4 model were used to cluster and analyze weather situation and backward trajectories of 251 haze episodes in Pearl River Delta（PRD） in dry season from 2005 to 2015.Analysis of the synoptic situation and the pollutants transmission on Jan.20 th in 2015 was made as a typical case.The results showed that the external sources causing haze in dry season in PRD,were mainly from north of PRD（ inland）.During the forming process of haze,both the negative vorticity advection 700 h Pa and sea level 850 h Pa had high pressure systems in North China.Pollutants were transported by northeast airstream of the high pressure from Yangtze River Delta（YRD） to PRD.During the haze occurrence,average air mass flux was negative in YRD but positive in PRD.Under the control of downdraft influenced by high pressure air in PRD,Q-vector divergence was positive and the pollutants easily resulted in haze.

关 键 词：霾 跨界输送 天气形势 垂直运动 Q矢量散度 

分 类 号：X328[环境科学与工程—环境工程]