基于CMAQ和HYSPLIT模式的日照市夏季臭氧污染成因和来源分析  

Analysis of Causes and Sources of Summer Ozone Pollution in Rizhao Based on CMAQ and HYSPLIT Models

作　　者：林鑫 仝纪龙[1] 王伊凡 陈羽翔 刘永乐 张鑫 敖丛杰 刘浩天 LIN Xin;TONG Ji-long;WANG Yi-fan;CHEN Yu-xiang;LIU Yong-le;ZHANG Xin;AO Cong-jie;LIU Hao-tian(College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学大气科学学院,兰州730000

出　　处：《环境科学》2023年第6期3098-3107,共10页Environmental Science

基　　金：国家自然科学基金项目(42075174)。

摘　　要：日照市作为典型沿海城市,近年来O_(3)污染日益严重,为探究O_(3)污染成因和来源,基于CMAQ模型的IPR过程分析和ISAM源追踪工具分别量化不同物理化学过程,不同源追踪区域对日照市O_(3)的贡献,并对比在O_(3)超标日和非超标日的差异,结合HYSPLIT模式探究日照市O_(3)的区域输送路径.结果表明,以日照市及周边为CMAQ模拟区域,O_(3)超标日与非超标日相比,日照市和连云港市沿海附近O_(3)、NO_(x)和VOCs浓度明显增加,这主要是由于超标日日照市为西风、西南风和东风的辐合区,易于污染物的输送并累积;过程分析显示,输送过程(TRAN)对日照市和连云港市沿海附近的近地面O_(3)贡献在超标日明显增加,而对临沂以西大部分区域贡献减小.光化学反应(CHEM)在各个高度对日照市白天O_(3)浓度均为正贡献,TRAN在离地0~60 m为正贡献,在60 m以上主要为负贡献,超标日CHEM和TRAN在离地0~60 m的贡献会显著增加,是非超标日时贡献的2倍左右;源解析显示,日照市本地源是NO_(x)和VOCs的主要贡献源,贡献率分别为47.5%和58.0%,O_(3)主要来自模拟区域外贡献(67.5%),超标日日照市西面城市(潍坊市和临沂市等)和南面城市(连云港市等)的O_(3)及前体物贡献会显著增大;输送路径分析显示,来自日照市西面的路径中超标轨迹数占比最大(11.8%),为日照市O_(3)及前体物的主要输送通道,这与过程分析和源追踪结果相互验证,该类轨迹占总轨迹数的13.0%,其主要途经陕西、山西、河北和山东地区.As a typical coastal city,O_(3) pollution in Rizhao has become increasingly serious in recent years.In order to explore the causes and sources of O_(3) pollution,IPR process analysis and ISAM source tracking tools based on the CMAQ model were used,respectively,to quantify the contributions of different physicochemical processes and different source tracking areas to O_(3) in Rizhao.Additionally,by comparing the differences between O_(3)-exceeding days and non-exceeding days,combined with the HYSPLIT model,the regional transportation path of O_(3) in Rizhao was explored.The results showed that the concentrations of O_(3),NO_(x),and VOCs near the coastal areas of Rizhao and Lianyungang were significantly increased on O_(3) exceedance days compared with those on non-exceedance days.This was mainly because Rizhao was the convergence zone of western,southwestern,and eastern winds on exceedance days,which facilitated the transport and accumulation of pollutants.Process analysis showed that the transport process(TRAN)contribution to the near-surface O_(3) near the coastal areas of Rizhao and Lianyungang increased significantly on the exceedance days,whereas the contribution to most areas to the west of Linyi decreased.Photochemical reaction(CHEM)had a positive contribution to the O_(3) concentration in Rizhao during the daytime at all heights,and TRAN had a positive contribution at 0-60 m above the ground,and mainly had a negative contribution above 60 m.The contributions of CHEM and TRAN at 0-60 m above the ground would increase significantly on exceedance days,which was approximately twice that on the non-exceedance days.Source analysis showed that the local sources in Rizhao were the main contribution sources of NO_(x) and VOCs,with the contribution rates of 47.5% and 58.0%,respectively.O_(3) mainly came from the contribution outside the simulation area(67.5%).The O_(3) and precursor contributions of the western cities of Rizhao(Weifang,Linyi,etc.)and the southern cities(Lianyungang,etc.)would increase significantly

关 键 词：日照市 臭氧(O_(3)) CMAQ模型 ISAM工具 HYSPLIT模型 来源分析 过程分析 

分 类 号：X515[环境科学与工程—环境工程]