2018-2021年北京PM2.5污染事件的区域传输特征

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Dejia Yin , Qian Song , Yuanxi Guo , Yueqi Jiang , Zhaoxin Dong , Bin Zhao , Shuxiao Wang , Da Gao , Xing Chang , Haotian Zheng , Shengyue Li , Yunting Li , Baoxian Liu
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引用次数: 0

摘要

尽管近年来大气污染物排放大幅减少,但 PM2.5 污染事件的发生仍是北京棘手的环境问题,而区域交通是关键的影响因素。然而,近年来一直难以确定区域交通特征和污染事件的主要成因。在本研究中,通过嵌入综合污染源分配模型的社区多尺度空气质量模型(CMAQ-ISAM),量化了2018-2021年PM2.5污染事件中区域传输的相对贡献率(61.3%)。在所有事件中,对北京贡献比例最大的四个地区分别是山东(7.7%)、河北南部(7.3%)、保定(6.2%)和廊坊(5.8%)。根据区域传输方向,污染事件分为以下类型:本地、西南(SW)、东南(SE)、南混(SM)和其他。根据传输距离,西南、东南和南混类型又可细分为西南-短距离、西南-长距离、东南-短距离、东南-长距离、南混-短距离、南混-西南-长距离、南混-东南-长距离和南混-西南-东南-长距离。其中,SE-长型被认为是最重要的类型,相对频率最高(20%)。输送方向与京津冀南部 925 hPa 的西南风和 1000 hPa 的东南风有关,输送距离主要受风力控制。风场差异可归因于控制京津冀地区的低压和高压系统。结果表明,区域联合污染控制应根据运输类型进行优化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Regional transport characteristics of PM2.5 pollution events in Beijing during 2018–2021

Although air pollutant emissions have sharply reduced in recent years, the occurrence of PM2.5 pollution events remains an intractable environmental problem in Beijing, and regional transport is the key influence factor. However, it has been difficult to identify regional transport characteristics and the main contributors to pollution events in recent years. In this study, the relative contribution of regional transport was quantified (61.3%) in PM2.5 pollution events during 2018-2021 by the Community Multiscale Air Quality model embedded with the Integrated Source Apportionment Model (CMAQ-ISAM). The four regions with the largest fractional contributions to Beijing for all events were Shandong (7.7%), South Hebei (7.3%), Baoding (6.2%), and Langfang (5.8%). Pollution events were classified into the following types based on regional transport directions: local, southwest (SW), southeast (SE), south-mixed (SM), and others. Based on the transport distance, the SW, SE, and SM types can be subdivided into SW-short, SW-long, SE-short, SE-long, SM-short, SM-long distance from southwest, SM-long distance from southeast, and SM-long distance from southwest and southeast. SE-long was regarded as the most important type, with the highest relative frequency (20%). The transport directions were related to the southwest wind at 925 hPa and southeast wind at 1000 hPa in the south of the Beijing–Tianjin–Hebei (BTH) region, and the distance was mainly controlled by wind strength. The wind-field difference can be attributed to the low-pressure and high-pressure systems that control the BTH region. The results suggest that regional joint pollution control should be optimized based on the transport type.

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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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