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Preprints
https://doi.org/10.5194/egusphere-2022-77
https://doi.org/10.5194/egusphere-2022-77
04 Apr 2022
 | 04 Apr 2022

Circulation-regulated impacts of aerosol pollution on urban heat island in Beijing

Fan Wang, Gregory Carmichael, Jing Wang, Bin Chen, Bo Huang, Yuguo Li, Yuanjian Yang, and Meng Gao

Abstract. Unprecedented urbanization in China has led to serious urban heat island (UHI) issues, exerting intense heat stress on urban residents. Based on observed temperature and PM2.5 concentrations in Beijing over 2016–2020, we find diverse influences of aerosol pollution on urban heat island intensity (UHII) under different circulations. When northerly winds are prevalent in urban Beijing, UHII tends to be much higher at both daytime and night-time and it is less affected by aerosol concentration. However, when southerly and westerly winds are dominant in rural Beijing, UHII is significantly reduced by aerosol pollution. Using coupled aerosol-radiation-weather simulations, we demonstrate the underlying physical mechanism, which is associated with local circulation and resulting spatial distribution of aerosols. Our results also highlight the role of black carbon in aggravating UHI, especially during night-time. It could thus be targeted for cooperative management of heat islands and aerosol pollution.

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Journal article(s) based on this preprint

18 Oct 2022
Circulation-regulated impacts of aerosol pollution on urban heat island in Beijing
Fan Wang, Gregory R. Carmichael, Jing Wang, Bin Chen, Bo Huang, Yuguo Li, Yuanjian Yang, and Meng Gao
Atmos. Chem. Phys., 22, 13341–13353, https://doi.org/10.5194/acp-22-13341-2022,https://doi.org/10.5194/acp-22-13341-2022, 2022
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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Unprecedented urbanization in China has led to serious urban heat island (UHI) issues, exerting...
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