Unheralded contributions of biogenic volatile organic compounds from urban greening to ozone pollution: a high-resolution modeling study

IF 5.2 1区地球科学 Q1 ENVIRONMENTAL SCIENCES

Atmospheric Chemistry and Physics Pub Date : 2024-06-25 DOI:10.5194/egusphere-2024-1163

Haofan Wang, Yuejin Li, Yiming Liu, Xiao Lu, Yang Zhang, Qi Fan, Tianhang Zhang, Chong Shen

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Abstract

Abstract. Urban Green Spaces (UGS) are widely advocated for mitigating urban atmospheric environment. However, this study reveals that it can exacerbate urban ozone (O₃) levels under certain conditions, as demonstrated by a September 2017 study in Guangzhou, China. Utilizing the Weather Research and Forecasting Model with the Model of Emissions of Gases and Aerosols from Nature (WRF-MEGAN) and the Community Multiscale Air Quality (CMAQ) model with a high horizontal resolution (1 km), we assessed the impact of UGS-related biogenic volatile organic compound (BVOC) emissions on urban O₃. Our findings indicate that UGS-BVOC emissions in Guangzhou amounted to 666.49 Gg, primarily from isoprene (ISOP) and terpenes (TERP). These emissions contribute ~30 % of urban ISOP concentrations and their incorporations to the model significantly reduce the underestimation against observations. The study shows improvements in simulation biases for NO₂, from 7.01 µg/m³ to 6.03 µg/m³, and for O₃, from 7.77 µg/m³ to -1.60 µg/m³. UGS-BVOC and UGS-LUCC (land use cover changes) integration in air quality models notably enhances surface monthly mean O₃ predictions by 3.6–8.0 µg/m³(+3.8–8.5 %) and contributes up to 18.7 µg/m³(+10.0 %) to MDA8 O₃ during O₃ pollution episodes. Additionally, UGS-BVOC emissions alone increase the monthly mean O₃ levels by 2.2–3.0 µg/m³(+2.3–3.2 %) in urban areas and contribute up to 6.3 µg/m³(+3.3 %) to MDA8 O₃ levels during O₃ pollution episodes. These impacts can extend to surrounding suburban and rural areas through regional transport, highlighting the need for selecting low-emission vegetation and refining vegetation classification in urban planning.

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城市绿化产生的生物挥发性有机化合物对臭氧污染的贡献未被察觉：一项高分辨率模型研究

摘要城市绿地（UGS）被广泛提倡用于缓解城市大气环境。然而，本研究发现，在某些条件下，城市绿地会加剧城市臭氧（O3）水平，2017 年 9 月在中国广州进行的一项研究就证明了这一点。利用气象研究和预报模型与自然界气体和气溶胶排放模型（WRF-MEGAN）以及高水平分辨率（1 千米）的社区多尺度空气质量（CMAQ）模型，我们评估了与 UGS 相关的生物挥发性有机化合物（BVOC）排放对城市臭氧（O3）的影响。研究结果表明，广州的 UGS-BVOC 排放量为 666.49 千兆克，主要来自异戊二烯（ISOP）和萜烯（TERP）。这些排放物占城市 ISOP 浓度的约 30%，将其纳入模型可显著减少对观测数据的低估。研究显示，二氧化氮的模拟偏差从 7.01 µg/m3 降至 6.03 µg/m3，臭氧的模拟偏差从 7.77 µg/m3 降至 -1.60 µg/m3。将 UGS-BVOC 和 UGS-LUCC（土地利用覆盖变化）集成到空气质量模型中，可显著提高地表月平均 O3 预测值 3.6-8.0 µg/m3 (+3.8-8.5 %)，并在 O3 污染事件期间对 MDA8 O3 的贡献高达 18.7 µg/m3 (+10.0 %)。此外，仅 UGS-BVOC 排放就会使城市地区的月平均 O3 水平增加 2.2-3.0 µg/m3 (+2.3-3.2 %)，并在 O3 污染事件期间使 MDA8 的 O3 水平增加高达 6.3 µg/m3 (+3.3 %)。这些影响可通过区域运输扩展到周围的郊区和农村地区，这突出表明了在城市规划中选择低排放植被和完善植被分类的必要性。

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来源期刊

Atmospheric Chemistry and Physics 地学-气象与大气科学

CiteScore

10.70

自引率

20.60%

发文量

702

审稿时长

6 months

期刊介绍： Atmospheric Chemistry and Physics (ACP) is a not-for-profit international scientific journal dedicated to the publication and public discussion of high-quality studies investigating the Earth''s atmosphere and the underlying chemical and physical processes. It covers the altitude range from the land and ocean surface up to the turbopause, including the troposphere, stratosphere, and mesosphere. The main subject areas comprise atmospheric modelling, field measurements, remote sensing, and laboratory studies of gases, aerosols, clouds and precipitation, isotopes, radiation, dynamics, biosphere interactions, and hydrosphere interactions. The journal scope is focused on studies with general implications for atmospheric science rather than investigations that are primarily of local or technical interest.