摘要
污染物区域间输送是大气环境研究的重点和难点。利用2012―2015年间浙江省污染程度较高的霾天气过程激光雷达观测数据,根据Mie散射理论和Fernald反演方法计算污染物垂直浓度,开展了高影响霾天气区域间污染物输送沉降特征定量研究。结果表明:(1)浙江省高影响霾天气多发生于高压前部转高压控制的情况,高压前部利于外来污染物输入,而高压控制利于本地污染物累积;(2)不同过程及同一过程不同时刻外来污染物输送高度、质量浓度、结构组成都不相同,污染物集中输送高度一般介于4.5~7.5km之间,输入最大质量浓度一般介于450~1200μg·m^(-3)之间,输入污染物中粗颗粒物居多,污染物类型主要包括沙尘和城市污染物;(3)个例分析表明,输入污染物仅有25%~35%沉降到近地面,重力和气温下降是影响沉降的重要原因,其中重力对粗颗粒物沉降作用更大,而气温下降对细颗粒物作用更大。
Inter-regional transport of pollutants is an important and difficult problem in atmospheric environment research.Based on lidar observation data of haze weather processes with high pollution levels in Zhejiang Province,China,from 2012 to 2015,aerosol vertical mass concentration in the region during the period were retrieved and the corresponding inter-regional transport of pollutants in high impact haze weather was studied quantitatively using Mie's theory and Fernald inversion method.The results show that:(1)high impact haze weather in Zhejiang during the period mostly occurs when high-pressure front turns to high-pressure control.High-pressure front is conducive to foreign pollutant input,while high-pressure control is conducive to local pollutant accumulation.(2)The transport height,mass concentration and composition of foreign pollutants vary in different high impact haze processes and even different moments in the same process.The variations of transport height and mass concentration of foreign pollutants are generally from 4.5 to 7.5 km and 450 to 1200μg·m^(-3),respectively.Meanwhile,the input pollutants are mainly coarse particles,and the types of pollutants are dominated by sand dust and urban pollutants.(3)Case study shows that only 25 to 35 percent of the input pollutants settles to the near-surface layer.Gravity and temperature decline are the important factors affecting deposition.Comparativley,gravity has a greater effect on the deposition of coarse particles,while air temperature decline has a greater effect on that of fine particles.
作者
毛敏娟
刘厚通
邓芳萍
董一雷
MAO Minjuan;LIU Houtong;DENG Fangping;DONG Yilei(Zhejiang Institute of Meteorology Science,Hangzhou 310008,China;College of Mathematics,Physics and Engineering,Anhui University of Technology,Maanshan 243002,China)
出处
《大气与环境光学学报》
CAS
CSCD
2023年第6期541-552,共12页
Journal of Atmospheric and Environmental Optics
基金
国家自然科学基金面上项目(41475134)
浙江省公益性社会发展面上项目(LGF22D050002)。
