Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote Sensing, Anhui Institute of Meteorological Sciences, Hefei, 230031, China; Shouxian National Climatology Observatory, Huaihe River Basin Typical Farm Eco-meteorological Experiment Field of CMA, Shouxian, 232200, China.
China Meteorological Administration Basin Heavy Rainfall Key Laboratory/Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan, 430205, China.
Environ Pollut. 2024 Dec 1;362:124967. doi: 10.1016/j.envpol.2024.124967. Epub 2024 Sep 14.
Atmospheric boundary layer (ABL) structure was a crucial factor in altering the vertical aerosol distribution and modulating the impact of regional aerosol transport on the atmospheric environment in the receptor region. The long-term characteristics of ABL structures for different vertical aerosol distributions and the distinct influencing mechanisms between daytime and nighttime aerosol transport interacting with the diurnal ABL transition have rarely been studied in the receptor regions. Based on 9-year (2013-2021) satellite-retrieved profiles of aerosol extinction coefficients and meteorological sounding data, we targeted Wuhan, an urban city with noteworthy transport contribution in central China, to reveal the general wintertime transport height of ∼500 m and the corresponding unstable ABL structure during regional transport. By comparing typical daytime and nighttime aerosol transport with high-resolution Lidar observations, the aerosol transport near the ABL top coupled with intense mechanical mixing provided sufficient meteorological conditions for heavy aerosol pollution formation in the receptor regions, which was more favorable during nighttime transport followed by the adequate ABL development after sunrise. These findings enhance our comprehension of the ABL impact on air pollution in the receptor regions, which have implications for the precise prevention and control of the regional atmospheric environment.
大气边界层（ABL）结构是改变垂直气溶胶分布和调节区域气溶胶传输对受体区域大气环境影响的关键因素。在受体区域，不同垂直气溶胶分布的 ABL 结构的长期特征以及白天和夜间气溶胶传输与日变化 ABL 转变之间的不同影响机制很少被研究。基于 9 年（2013-2021 年）的气溶胶消光系数卫星反演廓线和气象探测数据，我们以武汉为目标，武汉是中国中部具有显著传输贡献的城市，揭示了典型冬季的区域性传输高度约为 500m 和相应的不稳定 ABL 结构。通过将典型的白天和夜间气溶胶传输与高分辨率激光雷达观测进行比较，ABL 顶部附近的气溶胶传输与强烈的机械混合相结合，为受体区域形成严重的气溶胶污染提供了充足的气象条件，夜间传输后由于日出后 ABL 的充分发展，这种情况更为有利。这些发现增强了我们对 ABL 对受体区域空气污染影响的理解，这对精确预防和控制区域大气环境具有重要意义。
