厘清气象、人为和生物源排放对华东地区地表臭氧增加的影响

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric Research Pub Date : 2024-09-21 DOI:10.1016/j.atmosres.2024.107699
Min Shao , Shun Lv , Yueming Song , Rui Liu , Qili Dai
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引用次数: 0

摘要

自 2013 年以来,中国的 "清洁空气行动 "大大改善了环境 PM2.5 空气质量。然而,近年来城市地区的臭氧(O3)污染有所恶化,尤其是在东部地区。在这些高排放地区,O3 的形成非常复杂,受众多因素的制约。本研究利用天气研究和预报模式与化学耦合(WRF-Chem),通过对 2013 年和 2017 年的九个敏感性实验进行了综合分析,旨在厘清主要因素(如气象因素、人为排放、生物排放和气溶胶反馈机制)对观测到的 O3 浓度趋势的相对贡献。我们的研究结果表明,在经济活跃的苏南地区,臭氧日均最大值 8 小时平均值(MDA8)明显上升,而在欠发达的苏北地区,臭氧日均最大值 8 小时平均值(MDA8)则有所下降。研究发现,人为排放变化是臭氧变化的主要驱动因素,气象条件和气溶胶反馈效应也产生了重大影响,而生物排放变化的作用较小。在气象因素方面,我们发现与2013年相比,2017年气象热力因素(太阳辐射增强和气温升高)的变化对O3形成的影响比热力驱动的动力因素(边界层高度和风速)的变化更为明显。此外,研究观察到 O3 形成的敏感性从对挥发性有机化合物敏感转变为对过渡或氮氧化物敏感,这标志着有利于 O3 生成的区域大气化学发生了显著变化。气溶胶反馈效应通过复杂的途径,包括光解速率的改变和臭氧垂直分布的改变,进一步加剧了降低臭氧水平的挑战。我们的研究强调了采取适应性强、针对特定地区的战略来减轻臭氧污染的必要性,为决策者制定有效的控制措施提供了潜在的启示。
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Disentangling the effects of meteorology and emissions from anthropogenic and biogenic sources on the increased surface ozone in Eastern China
China's Clean Air Actions have substantially improved ambient PM2.5 air quality since 2013. However, ozone (O3) pollution in urban areas has worsened in recent years, particularly in the eastern region. The formation of O3 in these high emission areas is highly complex and regulated by numerous factors. Utilizing the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem), this study conducted a comprehensive analysis through nine sensitivity experiments for the years 2013 and 2017, aimed at disentangling the relative contributions of major factors (e.g., meteorological factors, anthropogenic emissions, biogenic emissions, and aerosol feedback mechanisms) to the observed O3 concentration trends in Jiangsu, a developed region of China with increasing trend of O3 level. Our findings indicate a pronounced increase in mean daily maximum 8-h average (MDA8) O3 levels in the economically vibrant southern Jiangsu, contrasted with a decrease in the less developed northern regions. The study identifies anthropogenic emissions change as the primary driver of O3 variations, with significant impacts also attributed to meteorological conditions and aerosol feedback effects, while biogenic emission shifts play a lesser role. In terms of meteorological factors, we discovered that the alteration in meteorological thermal factors (enhanced solar radiation and temperatures) in 2017, compared to 2013, exerted a more pronounced influence on the formation of O3 than the change in thermally driven dynamic factors (boundary layer height and wind speed). Moreover, the study observes a shift in O3 formation sensitivity from VOC-sensitive to transitional or NOX-sensitive regimes, signifying a notable transformation in the regional atmospheric chemistry conducive to O3 generation. Aerosol feedback effects, through complex pathways including photolysis rate alterations and modifications in the vertical O3 distribution, further compound the challenge of mitigating O3 levels. Our research underscores the necessity for adaptive, region-specific strategies to mitigate O3 pollution, providing potential insights for policymakers to formulate effective control measures.
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来源期刊
Atmospheric Research
Atmospheric Research 地学-气象与大气科学
CiteScore
9.40
自引率
10.90%
发文量
460
审稿时长
47 days
期刊介绍: The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.
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