The interaction between urbanization and aerosols during a typical winter haze event in Beijing
urbanization causes warming by altering the surface albedo and releasing
anthropogenic heat. The combined effect of the two phenomena needs to be
studied in depth. The effects of urbanization and aerosols were investigated
during a typical winter haze event. The event, which occurred in Beijing
from 15 to 22 December 2016, was studied via the Rapid-Refresh Multiscale
Analysis and Prediction System – Short Term (RMAPS-ST) model. The mechanisms
of the impacts of aerosols and urbanization were analyzed and quantified.
Aerosols reduced urban-related warming during the daytime by 20 % (from 30 %
to 50 %) as concentrations of fine particulate matter (PM2.5) increased from 200 to
400 µg m−3. Conversely, aerosols also enhanced urban-related
warming at dawn, and the increment was approximately 28 %, which
contributed to haze formation. Urbanization reduced the aerosol-related
cooling effect by approximately 54 % during the haze event, and the
strength of the impact changed little with increasing aerosol content. The
impact of aerosols on urban-related warming was more significant than the
impact of urbanization on aerosol-related cooling. Aerosols decreased the
urban impact on the mixing-layer height by 148 % and on the sensible heat
flux by 156 %. Furthermore, aerosols decreased the latent heat flux;
however, this reduction decreased by 48.8 % due to urbanization. The
impact of urbanization on the transport of pollutants was more important
than that of aerosols. The interaction between urbanization and aerosols may
enhance the accumulation of pollution and weigh against diffusion.
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Song-You Hong, Yign Noh, Jimy Dudhia
John S. Kain
Dan Li, Elie Bou-Zeid
Gregory Thompson, Paul R. Field, Roy M. Rasmussen et al.
Miao Yu, Shiguang Miao, Qingchun Li
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Divyesh Varade, Hemant Singh · 2023
Parth Sarathi Roy, Reshma M. Ramachandran · 2022
- Published
- Aug 24, 2020
- Vol/Issue
- 20(16)
- Pages
- 9855-9870
- License
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