摘要
利用Hysplit、MeteoInfo模型,计算株洲2017—2019年特护期(10月至次年3月)的后向轨迹,并进行轨迹聚类、潜在源贡献因子(PSCF)和浓度权重轨迹(CWT)分析。结果表明,10—12月,污染物潜在源区主要分布在偏北方向,1—3月,偏南方向的源区不断扩大,这与季节更替、季风转换有关;12和1月,潜在源区面积最大,强度最强,传输通道最清晰。对特护期各月份进行权重潜在源贡献因子(WPSCF)和加权浓度权重轨迹(WCWT)分析,结果表明,12月有1条明显的WPSCF高值带起源于河南省中北部,一路向南,经平顶山、过南阳、再经襄阳进入湖北省,该高值带蛇形前进,过荆州跨长江经岳阳华容县进入湖南,再过常德、益阳,以弧形路径到达长株潭地区,这条路径是12月北方污染物影响长株潭的主要传输通道。WCWT分析也有类似结果,且通道路径更宽广,1月的潜在源区在偏北方向呈扇形分布,在较远距离上的河南、安徽等省份呈指状分布。经2017年12月5日重污染个例检验发现,传输轨迹与分析的传输通道一致。
Using Hysplit and MeteoInfo models,the backward trajectory of Zhuzhou during special care period from 2017 to 2019(October to march of the next year)was calculated,and trajectory cluster analysis was carried out,potential source contribution factor(PSCF)analysis and concentration weight trajectory(CWT)analysis were done as well.The results showed that from October to December,the potential source area of pollutants mainly distributed in the north direction,and from January to March,the source area in the south direction continued to expand,which is related to seasonal change and monsoon transformation.In December and January,the potential source area and the intensity reached the maximum,and the transmission channel came to be the clearest.The analysis of WPSCF and WCWT in each month of special care period showed that there was an obvious WPSC high value zone originated from the central and northern part of Henan Province.It went all the way south,passed by Pingdingshan,Nanyang,and Xiangyang and then went into Hubei Province.It went forward serpentinely,after it passssed by Jingzhou,it crossed the Yangtze River and entered Hunan through Yueyang Huarong,and then passed by Changde and Yiyang to reach Changsha-Zhuzhou-Xiangtan City Group by an arc path.This path was the main transmission channel for pollutants from the north to affect Changsha-Zhuzhou-Xiangtan City Group in December.WCWT analysis indicated similar results,and the channel path was wider.The potential source area in January was fan-shaped in the north direction and finger shaped in Henan,Anhui and other provinces.Through the inspection of heavy pollution cases on December 5,2017,it was found that the transmission trajectory was consistent with the analyzed transmission channel.
作者
李细生
张华
喻雨知
邓新林
罗慧妮
张靖
谢倩雯
LI Xi-sheng;ZHANG Hua;YU Yu-zhi;DENG Xin-lin;LUO Hui-ni;ZHANG Jing;XIE Qian-wen(Key Laboratory of Meteorological Disaster Privention and Mitigation in Hunnan Province, Changsha, Hunan 410118, China;Zhuzhou Meteorological Breau, Zhuzhou, Hunan 412003, China;Changsha Meteorological Breau, Changsha, Hunan 410017, China)
出处
《环境监控与预警》
2022年第1期19-27,共9页
Environmental Monitoring and Forewarning
基金
湖南省气象局2020年重点课题基金资助项目(XQKJ20A001)。
关键词
长株潭
大气污染
后向轨迹
潜在源
传输通道
Changsha-Zhuzhou-Xiangtan City Group
Air pollution
Backward trajectory
Potential source
Transmission channel
