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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Influence of Boundary Layer Structure and Low-Level Jet on PM2.5 Pollution in Beijing: A Case Study
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Influence of Boundary Layer Structure and Low-Level Jet on PM2.5 Pollution in Beijing: A Case Study

机译：边界层结构和低空急流对北京市PM2.5污染的影响：一个案例研究

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摘要

Beijing experiences frequent PM2.5 pollution, which is influenced by the planetary boundary layer (PBL) structure/process. Partly due to a lack of appropriate observations, the impacts of PBL on PM2.5 pollution are not yet fully understood. Combining wind-profiler data, radiosonde measurements, near-surface meteorological observations, aerosol measurements, and three-dimensional simulations, this study investigated the influence of PBL structure and the low-level jet (LLJ) on the pollution in Beijing from 19 to 20 September 2015. The evolution of the LLJ was generally well simulated by the model, although the wind speed within the PBL was overestimated. Being influenced by the large-scale southerly prevailing winds, the aerosols emitted from the southern polluted regions could be easily transported to Beijing, contributing to ~68% of the PM2.5 measured in Beijing on 20 September. The relative contribution of external transport of PM2.5 to Beijing was high in the afternoon (≥80%), which was related to the strong southerly PBL winds and the presence of thermally-induced upslope winds. On 20 September, the LLJ in Beijing demonstrated a prominent diurnal variation, which was predominant in the morning and after sunset. The occurrence of the LLJ could enhance the dilution capacity in Beijing to some extent, which favors the dilution of pollutants at a local scale. This study has important implications for better understanding the complexity of PBL structure/process associated with PM2.5 pollution in Beijing.
机译：北京经历着频繁的PM2.5污染，这受行星边界层（PBL）结构/过程的影响。部分由于缺乏适当的观察，PBL对PM2.5污染的影响尚未完全了解。结合风廓线数据，探空仪测量，近地表气象观测，气溶胶测量和三维模拟，本研究调查了19至20年间PBL结构和低空急流（LLJ）对北京污染的影响2015年9月。虽然高估了PBL内的风速，但该模型通常很好地模拟了LLJ的演化。受到南半球盛行的大风的影响，从南部污染区排放的气溶胶可以很容易地运到北京，占北京9月20日PM2.5的68％。下午PM2.5对外交通对北京的相对贡献较高（≥80％），这与强劲的南风PBL风和热诱发的上坡风的存在有关。 9月20日，北京的LLJ表现出明显的昼夜变化，主要在早晨和日落之后。 LLJ的出现可以在一定程度上增强北京的稀释能力，这有利于局部稀释污染物。这项研究对于更好地了解北京PM2.5污染相关PBL结构/过程的复杂性具有重要意义。

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