2016年冬季安徽寿县地区两次重污染过程分析研究
投稿时间:2018-01-12  修订日期:2018-04-10  点此下载全文
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作者单位E-mail
王康宏 南京信息工程大学 大气物理学院, 江苏 南京 210044 wkh@nuist.edu.cn 
倪婷 安徽省气象科学研究所, 安徽 合肥 23003
寿县国家气候观象台, 安徽 寿县 232200 
 
基金项目:国家重点研究发展计划(2016YFC0203304);国家自然科学基金资助项目(41505136;41975011)
中文摘要:利用2016年12月14日—2017年1月3日安徽寿县国家气候观象台大气边界层垂直探测资料、地面自动气象站资料、污染物浓度资料及天气图资料,对该地区两次重污染的积累和清除过程进行了分析,得到以下结论:1)两次重污染过程均起源于地面弱风(风速<3 m/s)、高湿(相对湿度>80%)等不利气象条件,导致污染物局地积累。再通过大风、降水、大雾过程等有利的扩散、沉降条件,对污染物进行清除。2)天气形势在重污染积累过程中起到了重要作用。主要特征表现为,高低空层结稳定,且低空处于湿区内部,多受暖舌控制或伴有暖平流。第一次重污染清除过程中,控制寿县地区的天气系统逐渐转变为低压,风向转为偏东风,并伴有降水天气。第二次污染物清除过程,则是大雾湿沉降和逆温层消除共同导致。3)重污染积累过程中边界层高度均偏低,最大高度也仅为500 m,对污染物垂直扩散范围有所限制,进而影响局地污染物浓度。重污染过程逆温现象多发,近地层逆温主要发生在夜间和清晨,逆温强度最强可达3℃/(100 m),污染物在逆温层低层和底部之下堆积。
中文关键词:重污染过程  天气形势  边界层高度  逆温层结
 
Analysis of meteorological causes of two heavily polluted weather processes in Shouxian Region of Anhui Province in winter of 2016
Abstract:In this study,the sounding data in the atmospheric boundary layer from 14 December 2016 to 4 January 2017 at the national climate observatory in Shou County,Anhui Province were used in conjunction with the meteorological data from conventional ground stations,pollutant concentration data and synoptic charts,to analyze the accumulation and removal processes of two heavy pollution events in this area.The analysis revealed the following key points.First,both heavy pollution episodes originated under stagnant atmospheric conditions unfavorable for diffusion (such as surface wind speed less than 3 m/s,and high relative humidity of greater than 80%),and were later alleviated by strong wind,precipitation and other favorable conditions for diffusion and deposition.Second,in terms of weather conditions,the high and low stratifications were stable during the accumulation of heavy pollution,and the lower layer was in the wet area,which was mostly controlled by warm tongue or accompanied by warm advection.At the same time,regional transport of pollutants was present.During the first heavy pollution removal,the weather control system in Shou County gradually changed to low pressure,and the lower layer was mostly east wind,with precipitation.The second process was caused by wet deposition of fog and removal of inversion layer.Finally,during the accumulation period of heavy pollution,the boundary layer height was low and the maximum height was only 500 m,which limited the vertical diffusion range of pollutants,thereby affecting the local pollutant concentration.Inversion occurred frequently during heavy pollution,and the surface layer inversion mainly occurred at night and early morning,with the inversion intensity reaching 3℃/(100 m).The pollutants accumulated in the lower layer of inversion and beaneath it.
keywords:heavy pollution  weather condition  boundary layer height  inversion layer
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