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首页> 外文期刊>Atmospheric chemistry and physics >Elevated 3D structures of PM 2.5 and impact of complex terrain-forcing circulations on heavy haze pollution over Sichuan Basin, China
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Elevated 3D structures of PM 2.5 and impact of complex terrain-forcing circulations on heavy haze pollution over Sichuan Basin, China

机译：PM 2.5升高的3D结构和复杂地形迫使循环对四川盆地重度雾度污染的影响

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摘要

Deep basins create uniquely favorable conditions for causing air pollution, and the Sichuan Basin (SCB) in Southwest China is such a basin featuring frequent heavy pollution. A wintertime heavy haze pollution event in the SCB was studied with conventional and intensive observation data and the WRF-Chem model to explore the 3D distribution of PM 2.5 to understand the impact of regional pollutant emissions, basin circulations associated with plateaus, and downwind transport to the adjacent areas. It was found that the vertical structure of PM 2.5 over the SCB was characterized by a remarkable hollow sandwiched by high PM 2.5 layers at heights of 1.5–3?km and a highly polluted near-surface layer. The southwesterlies over the Tibetan Plateau (TP) and Yunnan-Guizhou Plateau (YGP) resulted in a lee vortex over the SCB, which helped form and maintain heavy PM 2.5 pollution. The basin PM 2.5 was lifted into the free troposphere and transported outside of the SCB. At the bottom of the SCB, high PM 2.5 concentrations were mostly located in the northwestern and southern regions. Due to the blocking effect of the plateau terrain on the northeasterly winds, PM 2.5 gradually increased from northeast to southwest in the basin. In the lower free troposphere, the high PM 2.5 centers were distributed over the northwestern and southwestern SCB areas, as well as the central SCB region. For this event, the regional emissions from the SCB contributed 75.4?%–94.6?% to the surface PM 2.5 concentrations in the SCB. The SCB emissions were the major source of PM 2.5 over the eastern regions of the TP and the northern regions of the YGP, with contribution rates of 72.7?% and 70.5?%, respectively, during the dissipation stage of heavy air pollution over the SCB, which was regarded as the major pollutant source affecting atmospheric environment changes in Southwest China.
机译：深层盆地为造成空气污染产生了独特的有利条件，而中国西南部的四川盆地（SCB）是这种盆地常见的污染。研究了SCB中的冬季沉重阴霾污染事件，采用常规和密集的观察数据和WRF-CHEM-CHEM模型研究了PM 2.5的3D分布，了解区域污染物排放，盆地循环与强韧的影响，以及向下运输相邻的区域。发现PM 2.5垂直结构在SCB上的特征在于由高PM 2.5层夹在1.5-3 km和高度污染的近表面层的高度下夹在一起。西藏高原（TP）和云南 - 贵州高原（YGP）的西南部导致了SCB的李涡旋，这有助于形成和维持沉重的下午2.5污染。盆地PM 2.5被抬起到自由的对流层中，并在SCB外部运输。在SCB的底部，高PM 2.5浓度主要位于西北部和南部地区。由于高原地形对东北大风的影响，PM 2.5从东北到盆地的西南部逐渐增加。在较低的自由层，高PM 2.5中心分布在西北和西南SCB地区，以及中央SCB地区。对于这一事件，SCB的区域排放贡献了75.4％ - 94.6？％，在SCB中的表面PM 2.5浓度贡献。 SCB排放是在TP的东部地区和YGP的东部地区的PM 2.5的主要来源，贡献率分别为72.7？％和70.5？％，分散在SCB上的重空气污染的耗散阶段，被认为是影响中国西南部大气环境的主要污染源。

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