School of Environment, Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Xinxiang 453007, China; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China.
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Total Environ. 2022 May 15;821:153541. doi: 10.1016/j.scitotenv.2022.153541. Epub 2022 Jan 29.
Under weak weather systems, pollutants circulate on plains and hillsides by means of oscillatory mountain-plain breezes (MPB). To investigate the impact of MPB on ambient volatile organic compounds (VOCs) on the northern edge of the North China Plain (NCP) region, synchronous online VOCs observations were first performed in the southwestern (Beijing, urban area) and northeastern (Xinglong, background area) of the dominant wind directions from September 11, 2020, to October 13, 2020. The results revealed that during the observation period, the average mixing ratios of TVOCs in Beijing and Xinglong were 32.5 ± 21.6 and 14.2 ± 8.6 ppbv, respectively, and a coincident temporal evolution trend of VOCs was observed at the two sites. Combined with the results of the backward trajectory, southerly air transport led to a significant increase in VOCs concentration, and southerly airflow was usually accompanied by apparent MPB circulation. Furthermore, the occurrence of MPB led to a sharp increase (1.5 times) in VOCs concentration in both Beijing and Xinglong. This study indicates that the periodic oscillation of the MPB leads to the large-scale pollution of "garbage out and garbage in", and the VOCs discharged by industry are the key to future control.
在弱天气系统下，污染物通过振荡山-平原风（MPB）在平原和山坡上循环。为了研究 MPB 对华北平原（NCP）北部边缘环境挥发性有机化合物（VOCs）的影响，我们于 2020 年 9 月 11 日至 10 月 13 日，首次在主导风向的西南（北京，城区）和东北（兴隆，背景区）进行了同步在线 VOCs 观测。结果表明，在观测期间，北京和兴隆的 TVOCs 平均混合比分别为 32.5±21.6 和 14.2±8.6 ppbv，两个站点的 VOCs 呈现出一致的时间演变趋势。结合轨迹结果，南风输送导致 VOCs 浓度显著增加，南风气流通常伴随着明显的 MPB 环流。此外，MPB 的发生导致北京和兴隆的 VOCs 浓度急剧增加（1.5 倍）。本研究表明，MPB 的周期性振荡导致了大规模的“垃圾进垃圾出”污染，工业排放的 VOCs 是未来控制的关键。
