Impact of urbanized atmosphere-land processing to the near-ground distribution of air pollution over Central Liaoning Urban Agglomeration

IF 4.2 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Environment Pub Date : 2024-10-10 DOI:10.1016/j.atmosenv.2024.120866

Wenxi Zhang , Zhenxin Liu , Xiaolan Li , Yuhao Mao , Yanjun Ma , Hong Liao

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引用次数: 0

Abstract

Urban heat island effect and local atmospheric boundary layer circulation caused by urbanization are important factors affecting the transport and spatial and temporal distribution of atmospheric particulate matter in cities and surrounding areas. To analyze the local atmospheric circulation and its influence on the temporal and spatial characteristics of PM_2.5 concentration over the Central Liaoning Urban Agglomeration, a heavy haze process was selected. The atmospheric chemistry model WRF-Chem was applied for numerical simulations with sensitivity experiments of urban canopy physical processes. The experiment case (EXP) was set up by coupling an improved urban canopy model with WRF-Chem, in which more details of inhomogeneous wind and diffusion in the complexed street canyon were fully and reasonably considered. Compared with the control case (CTR) by the original WRF-Chem, the deviation of the simulated and observed near-surface temperature and atmospheric boundary layer height was significantly improved in EXP: the error during the daytime was reduced from −1.30% and −48.39% in CTR to −0.78% and −33.68% in EXP, respectively, while during the nighttime it was reduced from −1.15% and −48.98% to 0.05% and −24.42%. The simulation accuracy of the near-surface PM_2.5 concentration in EXP was also significantly higher: the deviation during the daytime was 18.24% in CTR and 3.28% in EXP, while it was reduced from 40.69% in CTR to 28.88% in EXP during the nighttime. Thus, the EXP improved significantly in meteorological simulation during the nighttime, and then particulate matter concentrations in EXP during the nighttime were obviously improved. This study shows that improving the wind profiles and diffusion mechanism in urban canopy schemes in the air quality model can effectively improve the simulation ability of the model on the transport and diffusion processes of atmospheric pollutants in cities and surrounding areas, thus improving the simulation ability of urban near-surface air pollution concentration.

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城市化大气-土地处理对辽宁中部城市群大气污染近地面分布的影响

城市化引起的城市热岛效应和局地大气边界层环流是影响城市及周边地区大气颗粒物传输和时空分布的重要因素。为分析辽宁中部城市群上空局地大气环流及其对 PM2.5 浓度时空特征的影响，选取了一次重度雾霾过程。应用大气化学模式 WRF-Chem 对城市冠层物理过程进行数值模拟和敏感性试验。通过将改进的城市冠层模型与 WRF-Chem 模型耦合，建立了实验案例（EXP），其中充分合理地考虑了复杂街道峡谷中不均匀风和扩散的更多细节。与原 WRF-Chem 的对照案例（CTR）相比，EXP 中模拟的近地面温度和大气边界层高度与观测值的偏差有了显著改善：白天的误差分别从 CTR 的-1.30%和-48.39%减小到 EXP 的-0.78%和-33.68%，夜间的误差从-1.15%和-48.98%减小到 0.05%和-24.42%。EXP 对近地表 PM2.5 浓度的模拟精度也显著提高：白天的偏差在 CTR 中为 18.24%，在 EXP 中为 3.28%，而夜间则从 CTR 中的 40.69%降至 EXP 中的 28.88%。因此，在夜间气象模拟中，EXP 得到了明显改善，从而使夜间 EXP 中的颗粒物浓度得到明显改善。本研究表明，改进空气质量模型中城市冠层方案的风廓线和扩散机理，可有效提高模型对城市及周边地区大气污染物传输和扩散过程的模拟能力，从而提高城市近地面大气污染浓度的模拟能力。

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来源期刊

Atmospheric Environment 环境科学-环境科学

CiteScore

9.40

自引率

8.00%

发文量

458

审稿时长

53 days

期刊介绍： Atmospheric Environment has an open access mirror journal Atmospheric Environment: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Atmospheric Environment is the international journal for scientists in different disciplines related to atmospheric composition and its impacts. The journal publishes scientific articles with atmospheric relevance of emissions and depositions of gaseous and particulate compounds, chemical processes and physical effects in the atmosphere, as well as impacts of the changing atmospheric composition on human health, air quality, climate change, and ecosystems.