Articles | Volume 26, issue 20
https://doi.org/10.5194/acp-26-14559-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-14559-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Shifting patterns of Ozone Season due to policy and human activity in Beijing between 2013 and 2023
Qian Li
Beijing Municipal Ecological and Environmental Monitoring Center, Beijing, 100048, China
Xiaofei Dong
Beijing Municipal Ecological and Environmental Monitoring Center, Beijing, 100048, China
Yuanxi Guo
Beijing Municipal Ecological and Environmental Monitoring Center, Beijing, 100048, China
Xiue Shen
CORRESPONDING AUTHOR
Beijing Municipal Ecological and Environmental Monitoring Center, Beijing, 100048, China
Zhang Zhang
Beijing Municipal Ecological and Environmental Monitoring Center, Beijing, 100048, China
Chunsheng Zhao
Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China
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Xinlei Lv, Jie Sun, Bishuo He, Fengjun Shen, Gang Zhao, Tong Liu, Qiqi Mo, Linghan Zeng, Ziye Zhang, Yunxiao Li, Batu Alaxi, Weili Lin, and Chunsheng Zhao
EGUsphere, https://doi.org/10.5194/egusphere-2026-4877, https://doi.org/10.5194/egusphere-2026-4877, 2026
This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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We studied how tiny airborne particles change sunlight and, in turn, the breakdown of nitrogen dioxide, an important step in ozone formation. Using optical calculations, a radiation model, and a new sensitivity method, we found that light scattering and absorption, surface reflection, particle coatings, soot absorption, humidity, and particle height all matter. Better measurements of these factors could improve air-quality predictions.
Shuqi Guo, Chengyi Fan, and Chunsheng Zhao
EGUsphere, https://doi.org/10.5194/egusphere-2026-3646, https://doi.org/10.5194/egusphere-2026-3646, 2026
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Water transport in aerosols affects cloud formation and atmospheric chemical reactions. Traditional direct measurements of water diffusion coefficients are time-consuming in highly viscous systems. We developed a universal method that derives water diffusion coefficients from the characteristic diffusion time, shortening observation time. This approach can be adapted to different experimental platforms, supporting further investigation of highly viscous aerosols and their atmospheric impacts.
Chengyi Fan and Chunsheng Zhao
Atmos. Meas. Tech., 19, 323–332, https://doi.org/10.5194/amt-19-323-2026, https://doi.org/10.5194/amt-19-323-2026, 2026
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Aerosols change their size and optical properties with humidity, influencing clouds and climate. Traditional instruments only capture the average behavior of many particles, missing how individual ones grow. We developed a precise optical method that traps and measures single particles as humidity varies, accurately determining their dry size and water uptake. This versatile approach applies to diverse particle types and enhances understanding of their roles in air quality and climate systems.
Bishuo He and Chunsheng Zhao
Atmos. Chem. Phys., 25, 7765–7776, https://doi.org/10.5194/acp-25-7765-2025, https://doi.org/10.5194/acp-25-7765-2025, 2025
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Factor uncertainty analysis helps us understand the impacts of factors on complex systems. Traditional methods have many limitations. This study introduces a new method to measure how each factor contributes to uncertainty. It gains insights into the role of each variable and works for all multi-factor systems. As an application, we analyzed how aerosols affect solar radiation and identified the key factors. These analyses can improve our understanding of the role of aerosols in climate change.
Chengyi Fan, Bishuo He, Shuqi Guo, Jie Qiu, and Chunsheng Zhao
Atmos. Chem. Phys., 25, 5761–5771, https://doi.org/10.5194/acp-25-5761-2025, https://doi.org/10.5194/acp-25-5761-2025, 2025
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Marine aerosols play a critical role in weather and climate, and their real part of the refractive index (RRI) is a key factor in their radiative effects. We present a study of RRI measurements using optical tweezer technology and find that the calculated results of RRI using the traditional method disagree with the measurements. A parameterization of the RRI and relative humidity relationship is proposed, and it will improve the radiation calculation in numerical models.
Ye Kuang, Jiangchuan Tao, Hanbing Xu, Li Liu, Pengfei Liu, Wanyun Xu, Weiqi Xu, Yele Sun, and Chunsheng Zhao
Atmos. Chem. Phys., 25, 1163–1174, https://doi.org/10.5194/acp-25-1163-2025, https://doi.org/10.5194/acp-25-1163-2025, 2025
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This study presents a novel optical framework to measure supersaturation, a fundamental parameter in cloud physics, by observing the scattering properties of particles that have or have not grown into cloud droplets. The technique offers high-resolution measurements, capturing essential fluctuations in supersaturation necessary for understanding cloud physics.
Weilun Zhao, Ying Li, Gang Zhao, Song Guo, Nan Ma, Shuya Hu, and Chunsheng Zhao
Atmos. Chem. Phys., 23, 14889–14902, https://doi.org/10.5194/acp-23-14889-2023, https://doi.org/10.5194/acp-23-14889-2023, 2023
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Studies have concentrated on particles containing black carbon (BC) smaller than 700 nm because of technical limitations. In this study, BC-containing particles larger than 700 nm (BC>700) were measured, highlighting their importance to total BC mass and absorption. The contribution of BC>700 to the BC direct radiative effect was estimated, highlighting the necessity to consider the whole size range of BC-containing particles in the model estimation of BC radiative effects.
Liang Yuan and Chunsheng Zhao
Atmos. Chem. Phys., 23, 3195–3205, https://doi.org/10.5194/acp-23-3195-2023, https://doi.org/10.5194/acp-23-3195-2023, 2023
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Chemical compositions vary between and within particles due to the complex sources and aging processes, causing particle-to-particle heterogeneity in aerosol hygroscopicity, which is of great importance to aerosol climatic and environmental effects. This study proposes an algorithm to quantify the heterogeneity from in situ measurements, sheds light on the reanalysis of the existing H-TDMA datasets, and could have a large impact on how we use and think about these datasets.
Weilun Zhao, Gang Zhao, Ying Li, Song Guo, Nan Ma, Lizi Tang, Zirui Zhang, and Chunsheng Zhao
Atmos. Meas. Tech., 15, 6807–6817, https://doi.org/10.5194/amt-15-6807-2022, https://doi.org/10.5194/amt-15-6807-2022, 2022
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A new method to determine black carbon mass size distribution (BCMSD) was proposed using the size-resolved absorption coefficient measured by an aerodynamic aerosol classifier in tandem with an aethalometer. This new method fills the gap in the high-time-resolution measurement of BCMSD ranging from upper submicron particle sizes to larger than 1 µm. This method can be applied to field measurement of BCMSD extensively for better understanding BC aging and better estimating the BC climate effect.
Gang Zhao, Tianyi Tan, Yishu Zhu, Min Hu, and Chunsheng Zhao
Atmos. Chem. Phys., 21, 18055–18063, https://doi.org/10.5194/acp-21-18055-2021, https://doi.org/10.5194/acp-21-18055-2021, 2021
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In this study, the black carbon (BC) mixing state index (χ) is developed to quantify the dispersion of ambient black carbon aerosol mixing states based on binary systems of BC and other non-black carbon components. We demonstrate that the BC light absorption enhancement increases with χ for the same MR, which indicates that χ can be employed as a factor to constrain the light absorption enhancement of ambient BC.
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Short summary
Beijing's ozone trends (2013–2023) show a lengthening Ozone Season despite strict emission controls. While low-percentile ozone levels rose, mean and high-percentile values remained stable. Key shifts include a later daily exposure window, flattened diurnal cycles (lower peaks, higher troughs), and reduced ozone production/loss rates. These findings establish a baseline for urban pollution evolution and provide critical insights for future policy formulation and public health protection.
Beijing's ozone trends (2013–2023) show a lengthening Ozone Season despite strict emission...
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