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基于CMAQ和HYSPLIT模式的日照市夏季臭氧污染成因和来源分析
摘要点击 1477  全文点击 805  投稿时间:2022-07-22  修订日期:2022-08-23
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中文关键词  日照市  臭氧(O3)  CMAQ模型  ISAM工具  HYSPLIT模型  来源分析  过程分析
英文关键词  Rizhao  ozone(O3)  CMAQ model  ISAM tool  HYSPLIT model  source analysis  process analysis
作者单位E-mail
林鑫 兰州大学大气科学学院, 兰州 730000 linx20@lzu.edu.cn 
仝纪龙 兰州大学大气科学学院, 兰州 730000 22399@lzu.edu.cn 
王伊凡 兰州大学大气科学学院, 兰州 730000  
陈羽翔 兰州大学大气科学学院, 兰州 730000  
刘永乐 兰州大学大气科学学院, 兰州 730000  
张鑫 兰州大学大气科学学院, 兰州 730000  
敖丛杰 兰州大学大气科学学院, 兰州 730000  
刘浩天 兰州大学大气科学学院, 兰州 730000  
中文摘要
      日照市作为典型沿海城市,近年来O3污染日益严重,为探究O3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O3的贡献,并对比在O3超标日和非超标日的差异,结合HYSPLIT模式探究日照市O3的区域输送路径.结果表明,以日照市及周边为CMAQ模拟区域,O3超标日与非超标日相比,日照市和连云港市沿海附近O3、NOx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O3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O3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NOx和VOCs的主要贡献源,贡献率分别为47.5%和58.0%,O3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O3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O3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.
英文摘要
      As a typical coastal city, O3 pollution in Rizhao has become increasingly serious in recent years. In order to explore the causes and sources of O3 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 O3 in Rizhao. Additionally, by comparing the differences between O3-exceeding days and non-exceeding days, combined with the HYSPLIT model, the regional transportation path of O3 in Rizhao was explored. The results showed that the concentrations of O3, NOx, and VOCs near the coastal areas of Rizhao and Lianyungang were significantly increased on O3 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 O3 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 O3 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 NOx and VOCs, with the contribution rates of 47.5% and 58.0%, respectively. O3 mainly came from the contribution outside the simulation area (67.5%). The O3 and precursor contributions of the western cities of Rizhao (Weifang, Linyi, etc.) and the southern cities (Lianyungang, etc.) would increase significantly on the days of exceeding the standard. The transportation path analysis showed that the number of exceedances accounted for the largest proportion (11.8%) in the path from the west of Rizhao, which was the main transportation channel of O3 and precursors in Rizhao. This was verified through process analysis and source tracking results, and such trajectories accounted for 13.0% of the total number of trajectories, and their main routes were in the Shaanxi, Shanxi, Hebei, and Shandong regions.

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