城市湖泊对城市低空大气污染物时空分布影响的机制分析
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1.南京信息工程大学环境科学与工程学院;2.江苏科技大学深蓝学院

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江苏省自然科学基金委碳达峰碳中和科技创新专项(BK20220031)


Mechanism Analysis of the Impact of Urban Lakes on the Spatio-temporal Distribution of Urban Lower Atmospheric Pollutants
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1.Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,School of Environmental Science and Engineering,Nanjing University of Information Science and Technology NUIST;2.Jiangsu University of Science and Technology,Shenlan College

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    摘要:

    湖泊在调节局地气候和空气质量方面发挥着重要的作用,城市湖泊对城市局地大气边界层环流和大气污染物输送机制的影响是目前城市空气质量研究的重要问题。研究分析了夏季南京城区濒湖站近地面大气污染物浓度的日变化特征,并与相对远离湖泊的非濒湖站的观测进行对比。结果表明,对于以近地面排放为主的NO2,日间濒湖站平均浓度比非濒湖站高大约1.64±0.29 μg·m-3,在夜间则反而低大约0.51±1.39 μg·m-3;而以边界层中高层生成与传输为主的O3,则呈现出与之相反的趋势:即日间濒湖站平均浓度较非濒湖站低大约9.57±2.19 μg·m-3,而夜间高大约1.24±4.68 μg·m-3;PM2.5未发现类似的浓度差异特征。进一步利用二维陆面过程模式结合不同排放情景对湖泊-城市陆地分布进行敏感性数值实验,模拟结果表明,城市区域内湖面与陆面的热力性质差异影响低空大气环流和垂直热力稳定度,并进一步影响城市近地面大气污染浓度的扩散传输过程。受湖泊存在的影响,白天位于湖泊及濒湖区域上方的垂直大气热力稳定度高于非濒湖区域上空,低层大气垂直扩散较弱,导致濒湖区域以近地面排放为主的污染物浓度偏高,而以边界层中高层排放与生成为主的污染物浓度则偏低,而夜间情况相反。该模拟结果与观测数据的趋势吻合,并且与WRF-Chem模拟结果定性上一致。

    Abstract:

    Lakes played an important role in regulating local climate and air quality. The impact of urban lakes on urban local atmospheric boundary layer circulation and atmospheric pollutant transport mechanisms was an important issue in current urban air quality research. This study analyzed the diurnal variation characteristics of near-surface atmospheric pollutant concentrations at lakeside stations in urban Nanjing in summer, and compared them with observations from non-lakeside urban stations relatively far away from the lake. The results showed that for NO2, which was mainly emitted near the ground, the average concentration in lakeside stations was about 1.64±0.29 μg·m-3 higher than that in non-lakeside city stations during the day, and was about 0.51±1.39 μg·m-3 lower at night. O3, which was mainly generated and transported in the middle and high levels of the boundary layer, showed the opposite trend: that is, the average concentration of lakeside stations during the day was about 9.57±2.19 μg·m-3 lower than that of non-lakeside city stations, while it was about 1.24±4.68 μg·m-3 higher at night; No similar concentration differences were found in PM2.5. We further used a two-dimensional land surface process model to conduct numerical experiments on the sensitivity of lake land use to lake-urban land distribution and different emission scenarios. The simulation results showed that the difference in thermal properties between lake surfaces and land surfaces in urban areas affects low-altitude atmospheric circulation. and vertical thermal stability, and further affected the diffusion and transmission process of urban near-surface air pollution concentration. Affected by the existence of the lake, the thermal stability of the vertical atmosphere above the lake and lakeside area during the day was higher than that over the non-lakeside area, and the vertical diffusion of the lower atmosphere was weaker, resulting in higher concentrations of pollutants mainly emitted near the surface in the lakeside area. The concentration of pollutants mainly emitted and generated at mid- and high-altitudes was low, while the situation was opposite at night. The simulation results were consistent with the observed data trends and qualitatively consistent with the WRF-Chem simulation results.

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  • 收稿日期:2023-11-29
  • 最后修改日期:2024-03-08
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  • 在线发布日期: 2024-05-21
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