太湖及与湖岸城市间大气颗粒物分布特征分析

发布时间：2018-01-28 04:06

本文关键词： 太湖大气颗粒物气象条件　出处：《气象科学》2016年06期 　论文类型：期刊论文

【摘要】：利用冬季连续2 d在两种气象条件下分别环绕太湖对湖泊近无锡区域、湖心区域、近西山岛区域和近苏州区域近湖层的PM0.5、PM2.5和PM10进行质量浓度观测,并通过分析同期相应气象资料(包括高空和地面风场、流场以及湖面站点的水平垂直风向风速等气象数据),探讨湖泊区域内外颗粒物浓度变化的时空特征以及受气象条件变化的影响。研究表明:第1天当天气为晴转阴且无雾时,由于湖面本身缺乏密集强排放源,以及因湖面大气上升运动较强使颗粒物容易被扩散稀释,且受偏东转东南气流所带来的气团较干净影响,湖面湖心区域和离岛区域颗粒物浓度明显低于上游城市;而在第2天当天气为雾时情况则相反,由于湖面大气较弱的上升运动使得大气颗粒物不容易被扩散稀释,且湖泊强大的水汽源影响有助于气溶胶和颗粒物的生成进而使得湖面颗粒物浓度大于周围城市。此外还发现在两种天气下,颗粒物浓度都存在无锡区域最高,湖心区域次之,苏州区域较低的特征。并且,在雾天不同粒径颗粒物间变化的相关系数更高。
[Abstract]:The PM0.5 of the lake near Wuxi, the center of the lake, the area near Xishan Island and the area near Suzhou were used to surround the lake in winter for two consecutive days under two meteorological conditions. PM2.5 and PM10 made mass concentration observation and analyzed the corresponding meteorological data (including upper and surface wind field, flow field and horizontal vertical wind wind speed and other meteorological data) during the same period. The temporal and spatial characteristics of the change of particulate matter concentration in and out of the lake area and the influence of meteorological conditions are discussed. The results show that when the weather turns cloudy and fog free on the first day, there is a lack of dense and strong emission sources on the lake surface itself. And because of the strong upward movement of the lake surface, the particulate matter is easy to diffuse and dilute, and is affected by the relatively clean air mass caused by the easterly and southeasterly air flow. The concentration of particulate matter in the center of lake and outlying islands was significantly lower than that in upstream cities. On the second day, when the weather is foggy, the situation is opposite, because of the weak rising motion of the lake surface atmosphere, the atmospheric particulate matter is not easy to be diffused and diluted. And the strong water vapor source influence the formation of aerosol and particulate matter, which makes the concentration of particulate matter higher than that of the surrounding city. In addition, it is found that the concentration of particulate matter is the highest in Wuxi region under both weather conditions. In the middle of the lake, the characteristics of Suzhou region are lower, and the correlation coefficient between different particle sizes in foggy days is higher.
【作者单位】：南京信息工程大学大气环境中心;南京信息工程大学环境科学与工程学院;广西柳州市气象局;
【基金】：江苏省青年科学基金项目(BK20150895) 南京信息工程大学人才启动基金项目
【分类号】：X513
【正文快照】： 3广西柳州市气象局,广西柳州545001)vapor source of lake and stable weather condition facilitates the genesis and accumulation of aerosol andparticles,which makes the different condition compared with the day without fog.In addition,the featureof spatial va

【相似文献】