科研成果

2021
Tan Z, Ma X, Lu K, Jiang M, Zou Q, Wang H, Zeng L, Zhang Y. Direct evidence of local photochemical production driven ozone episode in Beijing: A case study. Science of The Total Environment. 2021;800:148868.
Liu J, Li X, Tan Z, Wang W, Yang Y, Zhu Y, Yang S, Song M, Chen S, Wang H, et al. Assessing the Ratios of Formaldehyde and Glyoxal to NO 2 as Indicators of O 3 –NO x –VOC Sensitivity. Environmental Science & Technology. 2021;55.
Zhao G, Zhu Y, Wu Z, Zong T, Chen J, Tan T, Wang H, Xin F, Lu K, Zhao C, et al. Impact of aerosol–radiation interaction on new particle formation. Atmospheric Chemistry and Physics. 2021;21:9995-10004.
Liu Y, Wang H, Jing S, ZHOU M, LOU S, QU K, Qiu W, Wang Q, Li S, Gao Y, et al. Vertical Profiles of Volatile Organic Compounds in Suburban Shanghai. Advances in Atmospheric Sciences. 2021;38:1177-1187.
Wang H, Lu K, Chen S, Li X, Zeng L, Hu M, Zhang Y. Characterizing nitrate radical budget trends in Beijing during 2013–2019. Science of The Total Environment. 2021;795:148869.
Hallar A, Brown S, Crosman E, Barsanti K, Cappa C, Faloona I, Fast J, Holmes H, Horel J, Lin J, et al. Coupled Air Quality and Boundary-Layer Meteorology in Western U.S. Basins during Winter: Design and Rationale for a Comprehensive Study. Bulletin of the American Meteorological Society. 2021:1-94.
Xin F, Hu M, Shang D, Tan T, Zhao G, Zong T, Tang L, Ma X, Yang X, Dong HB, et al. New particle formation and its CCN enhancement in the Yangtze River Delta under the control of continental and marine air masses. Atmospheric Environment. 2021;254:118400.
Li J, Zhang N, Wang P, Choi M, Ying Q, Guo S, Lu K, Xionghui Q, Wang S, Hu M, et al. Impacts of chlorine chemistry and anthropogenic emissions on secondary pollutants in the Yangtze river delta region. Environmental Pollution. 2021;287:117624.
Huang X-F, Cao L-M, Tian X-D, Zhu Q, Saikawa E, Lin L-L, Cheng Y, He L-Y, Hu M, Zhang Y-H, et al. Critical Role of Simultaneous Reduction of Atmospheric Odd Oxygen for Winter Haze Mitigation. Environmental Science & Technology [Internet]. 2021;55:11557-11567. 访问链接
Shao M, Wang W, Yuan B, Parrish DD, Li X, Lu K, Wu L, Wang X, Mo Z, Yang S, et al. Quantifying the role of PM2.5 dropping in variations of ground-level ozone: Inter-comparison between Beijing and Los Angeles. Science of The Total Environment [Internet]. 2021;788:147712. 访问链接Abstract
In recent decade the ambient fine particle (PM2.5) levels have shown a trend of distinct dropping in China, while ground-level ozone concentrations have been increasing in Beijing and many other Chinese mega-cities. The variation pattern in Los Angeles was markedly different, with PM2.5 and ozone decreasing together over past decades. In this study, we utilize observation-based methods to establish the parametric relationship between PM2.5 concentration and key aerosol physical properties (including aerosol optical depth and aerosol surface concentration), and an observation-based 1-D photochemical model to quantify the response of PM2.5 decline in enhancing ground-level ozone pollution over a large PM2.5 concentration range (10–120 μg m−3). We find that the significance of ozone enhancement due to PM2.5 dropping depends on both the PM2.5 levels and optical properties of particles. Ozone formation increased by 37% in 2006–2016 due to PM2.5 dropping in Beijing, while it becomes less important (7%) as PM2.5 reaches below 40 μg/m3, similar to Los Angeles since 1980s. Therefore, the two cities show the convergence of air pollutant characteristics. Hence a control strategy prioritizing reactive volatile organic compound abatement is projected to yield simultaneous ozone and PM2.5 reductions in Beijing, as experienced in Los Angeles.
Gkatzelis GI, Papanastasiou DK, Karydis VA, Hohaus T, Liu Y, Schmitt SH, Schlag P, Fuchs H, Novelli A, Chen Q, et al. Uptake of Water-soluble Gas-phase Oxidation Products Drives Organic Particulate Pollution in Beijing. Geophysical Research Letters [Internet]. 2021;48:e2020GL091351. 访问链接Abstract
Abstract Despite the recent decrease in pollution events in Chinese urban areas, the World Health Organization air quality guideline values are still exceeded. Observations from monitoring networks show a stronger decrease of organic aerosol directly emitted to the atmosphere relative to secondary organic aerosol (SOA) generated from oxidation processes. Here, the uptake of water-soluble gas-phase oxidation products is reported as a major SOA contribution to particulate pollution in Beijing, triggered by the increase of aerosol liquid water. In pollution episodes, this pathway is enough to explain the increase in SOA mass, with formaldehyde, acetaldehyde, glycolaldehyde, formic acid, and acetic acid alone explaining 15%–25% of the SOA increase. Future mitigation strategies to reduce non-methane volatile organic compound emissions should be considered to reduce organic particulate pollution in China.
QU K, Wang X, Xiao T, Shen J, Lin T, Chen D, He L-Y, Huang X-F, Zeng L, Lu K, et al. Cross-regional transport of PM2.5 nitrate in the Pearl River Delta, China: Contributions and mechanisms. Science of the Total Environment [Internet]. 2021;753. 访问链接
Wang T, Zhao G, Tan T, Yu Y, Tang R, Dong HB, Chen S, Li X, Lu K, Zeng L, et al. Effects of biomass burning and photochemical oxidation on the black carbon mixing state and light absorption in summer season. Atmospheric Environment [Internet]. 2021;248. 访问链接
Yang Y, Li X, Zu K, Lian C, Chen S, Dong HB, Feng M, Liu H, Liu J, Lu K, et al. Elucidating the effect of HONO on O-3 pollution by a case study in southwest China. Science of the Total Environment [Internet]. 2021;756. 访问链接
Liu Z, Wang Y, Hu B, Lu K, Tang G, Ji D, Yang X, Gao W, Xie Y, Liu J, et al. Elucidating the quantitative characterization of atmospheric oxidation capacity in Beijing, China. Science of the Total Environment [Internet]. 2021;771. 访问链接
Yang X, Lu K, Ma X, Liu Y, Wang H, Hu R, Li X, Lou S, Chen S, Dong HB, et al. Observations and modeling of OH and HO2 radicals in Chengdu, China in summer 2019. Science of the Total Environment [Internet]. 2021;772. 访问链接
Li C, Wang H, Chen X, Zhai T, Chen S, Li X, Zeng L, Lu K. Thermal dissociation cavity-enhanced absorption spectrometer for measuring NO₂, RO₂NO₂, and RONO₂ in the atmosphere. Atmospheric Measurement Techniques [Internet]. 2021;14:4033–4051. 访问链接
Cheng X, Chen Q, Li Y, Huang G, Liu Y, Lu S, Zheng Y, Qiu W, Lu K, Qiu X, et al. Secondary Production of Gaseous Nitrated Phenols in Polluted Urban Environments. Environmental Science & Technology [Internet]. 2021:null. 访问链接
Song M, Li X, Yang S, Yu X, Zhou S, Yang Y, Chen S, Dong H, Liao K, Chen Q, et al. Spatiotemporal variation, sources, and secondary transformation potential of volatile organic compounds in Xi'an, China. Atmospheric Chemistry and Physics [Internet]. 2021;21:4939–4958. 访问链接
2020
Miao RQ, Chen Q, Zheng Y, Cheng X, Sun YL, Palmer PI, Shrivastava M, Guo JP, Zhang Q, Liu YH, et al. Model bias in simulating major chemical components of PM2.5 in China. Atmospheric Chemistry and Physics. 2020;20:12265-12284.Abstract
High concentrations of PM2.5 (particulate matter with an aerodynamic diameter less than 2.5 mu m) in China have caused severe visibility degradation. Accurate simulations of PM2.5 and its chemical components are essential for evaluating the effectiveness of pollution control strategies and the health and climate impacts of air pollution. In this study, we compared the GEOS-Chem model simulations with comprehensive datasets for organic aerosol (OA), sulfate, nitrate, and ammonium in China. Model results are evaluated spatially and temporally against observations. The new OA scheme with a simplified secondary organic aerosol (SOA) parameterization significantly improves the OA simulations in polluted urban areas, highlighting the important contributions of anthropogenic SOA from semivolatile and intermediate-volatility organic compounds. The model underestimates sulfate and overestimates nitrate for most of the sites throughout the year. More significant underestimation of sulfate occurs in winter, while the overestimation of nitrate is extremely large in summer. The model is unable to capture some of the main features in the diurnal pattern of the PM2.5 chemical components, suggesting inaccuracies in the presented processes. Potential model adjustments that may lead to a better representation of the boundary layer height, the precursor emissions, hydroxyl radical concentrations, the heterogeneous formation of sulfate and nitrate, and the wet deposition of nitric acid and nitrate have been tested in the sensitivity analysis. The results show that uncertainties in chemistry perhaps dominate the model biases. The proper implementation of heterogeneous sulfate formation and the good estimates of the concentrations of sulfur dioxide, hydroxyl radical, and aerosol liquid water are essential for the improvement of the sulfate simulation. The update of the heterogeneous uptake coefficient of nitrogen dioxide significantly reduces the modeled concentrations of nitrate. However, the large overestimation of nitrate concentrations remains in summer for all tested cases. The possible bias in the chemical production and the wet deposition of nitrate cannot fully explain the model overestimation of nitrate, suggesting issues related to the atmospheric removal of nitric acid and nitrate. A better understanding of the atmospheric nitrogen budget, in particular, the role of the photolysis of particulate nitrate, is needed for future model developments. Moreover, the results suggest that the remaining underestimation of OA in the model is associated with the underrepresented production of SOA.

Pages