Profiling of Dust and Urban Haze Mass Concentrations during the 2019 National Day Parade in Beijing by Polarization Raman Lidar

Wang, Zhuang; Liu, Cheng; Dong, Yunsheng; Hu, Qihou; Liu, Ting; Zhu, Yongnan; Xing, Chengzhi

doi:10.3390/rs13163326

Cited by 11 publications

(7 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beijing has also promoted public displays, such as the pyrotechnic spectacle in Tiananmen Square to commemorate the 70th anniversary of the People's Republic of China (20:00 on 1 October 2019). During these celebrations, nearby monitoring sites in Dongsi and Tiantan showed no peak because of the fireworks, and other researchers observed little effect from local emissions [59].…”

Section: Summary Discussionmentioning

confidence: 94%

Changes in Air Pollutants from Fireworks in Chinese Cities

Lai

Brimblecombe

2022

Atmosphere

View full text Add to dashboard Cite

Chinese New Year has traditionally been welcomed with fireworks, but this has meant this holiday can experience intense peaks of pollutants, particularly as particulate matter. Such environmental issues add to other risks (e.g., accident, fire, and ecological and health threats) posed by firework displays, but cultural reasons encourage such celebrations. This study examines air pollution from fireworks across a time of increasingly stringent bans as a time series from 2014–2021 using a random forest (decision-tree) model to explore the effect of year-to-year weather changes on pollutant concentrations at Chinese New Year. Peak concentrations of firework pollutants have decreased in cities and hint at the importance of well-enforced regulation of these traditional celebrations, e.g., Beijing, Tianjin, and Chongqing. The model suggested relative humidity was an important controlling variable, perhaps as the presence of water vapor might also accelerate particle growth but also as a surrogate parameter related to atmospheric mixing. Bans on fireworks, resisted at first, have shown evidence of growing public acceptance. The regulations are increasingly effective, even in the outer parts of cities. Celebrations might safely return as public firework displays, including light shows and the use of lanterns.

show abstract

Section: Summary Discussionmentioning

confidence: 94%

Changes in Air Pollutants from Fireworks in Chinese Cities

Lai

Brimblecombe

2022

Atmosphere

View full text Add to dashboard Cite

show abstract

“…(R 2 = 0.54 and 0.64 for linear and polynomial regression, respectively). In previous studies, the R 2 values between the extinction coefficients from lidar, satellite-based lidar, or visibility data and the mass concentration of PM2.5, measured by the in situ instrument, ranged from 0.50 to 0.96 [39][40][41]. The extinction coefficient calculated from mobile lidar on the vehicle was highly related to PM2.5, with a relative humidity of 90% or lower (R 2 = 0.8) [39].…”

Section: Extinction Coefficientmentioning

confidence: 87%

Estimation of Aerosol Extinction Coefficient Using Camera Images and Application in Mass Extinction Efficiency Retrieval

2022

View full text Add to dashboard Cite

In this study, we attempted to calculate the extinction parameters of PM2.5 using images from a commercial camera. The photo pixels provided information on the characteristics of the objects (i.e., the reflectivity, transmittance, or extinction efficiency) and ambient brightness. Using the RGB values of pixels, we calculated the extinction coefficient and efficiency applied to the mass concentration of PM2.5. The calculated extinction coefficient of PM2.5 determined from the camera images had a higher correlation with the PM2.5 mass concentration (R2 = 0.7) than with the visibility data, despite the limited mass range. Finally, we identified that the method of calculating extinction parameters using the effective wavelength of RGB images could be applied to studies of changes in the atmosphere and aerosol characteristics. The mass extinction efficiency of PM2.5, derived from images, and the mass concentration of PM2.5 was (10.8 ± 6.9) m2 g−1, which was higher than the values obtained in Northeast Asia by previous studies. We also confirmed that the dry extinction efficiency of PM2.5, applied with a DRH of 40%, was reduced to (6.9 ± 5.0) m2 g−1. The extinction efficiencies of PM2.5, calculated in this study, were higher than those reported in previous other studies. We inferred that high extinction efficiency is related to changes in size or the composition of aerosols; therefore, an additional long-term study must be conducted.

show abstract

“…The detailed derivation of POLIPHON method and relevant input parameters involved in the POLIPHON method are summarized in the Supplement and Table S1, respectively. Uncertainties in POLIPHON method are discussed in detail in previous studies (Freudenthaler et al, 2009;Tesche et al, 2009bTesche et al, , 2011aMamouri and Ansmann, 2014;Mamouri et al, 2015;Wang et al, 2021b;Ansmann et al, 2011;Bravo-Aranda et al, 2015), mainly consisting of two components: the input empirical parameters in Table S1 and the uncertainties of PRL-derived BAC 532 and PDR 532 . In general, the POLIPHON method estimates an uncertainty of 40 % (Ansmann et al, 2011).…”

Section: Polarization Lidar Photometer Networking (Poliphon) Methodsmentioning

confidence: 99%

Measurement report: Dust and anthropogenic aerosols' vertical distributions over northern China dense aerosols gathered at the top of the mixing layer

Wang,

Shi,

Zhang

et al. 2023

Atmos. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

Abstract. Over the past decades, northern China has been suffering from persistent air pollution caused by both fine and coarse atmospheric particles. Although there are plenty of theoretical and observational studies on aerosols in northern China, most of them only consider total aerosol concentrations and focus on heavy pollution episodes; the long-term vertical distributions of dust (coarse) and anthropogenic aerosols (fine) and their relationships with the mixing layer height (MLH) have not been revealed. In this study, the dust and anthropogenic aerosols' mass concentration and the MLH were retrieved by polarization Raman lidar over Beijing from May 2019 to February 2022. We found that large amounts of anthropogenic aerosols accumulate at the top of the mixing layer, which is most noticeable in summer, with monthly mean mass concentration up to 57 µg m−3. It is mainly influenced by the southward transport in the upper air, where the atmosphere is relatively stable and moist, favoring hygroscopic growth of particles. Dust mass concentration is discontinuous in the vertical direction, not only on the ground but also in lofted layers that reach up to several kilometers. The heights of these lofted dust layers exhibited apparent seasonal dependence, with the height of the main dust layer gradually ascending from 1.1 km to about 2.5 km from April to June and below 3 km from October to December. In addition, there is a significant negative correlation between bottom anthropogenic aerosols' mass concentration and the MLH, and an inverse function fit is more suitable to characterize this relationship, while the relationship between bottom dust mass concentration and the MLH is insignificant. These results will enhance our understanding of the sophisticated interactions between dust and anthropogenic aerosols, the MLH, and regional transport in northern China. It will also help to refine atmospheric chemistry models and improve surface prediction capabilities.

show abstract

Profiling of Dust and Urban Haze Mass Concentrations during the 2019 National Day Parade in Beijing by Polarization Raman Lidar

Cited by 11 publications

References 42 publications

Changes in Air Pollutants from Fireworks in Chinese Cities

Changes in Air Pollutants from Fireworks in Chinese Cities

Estimation of Aerosol Extinction Coefficient Using Camera Images and Application in Mass Extinction Efficiency Retrieval

Measurement report: Dust and anthropogenic aerosols' vertical distributions over northern China dense aerosols gathered at the top of the mixing layer

Contact Info

Product

Resources

About