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 Wang1, Gregory Carmichael2, Jing Wang3, Bin Chen4, Bo Huang5, Yuguo Li6, Yuanjian Yang7, and Meng Gao1 Fan Wang et al.
  • 1Department of Geography, State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong SAR, 999077, China
  • 2Department of Chemical and Biochemical Engineering, The University of Iowa, Iowa City, IA 52242, USA
  • 3Tianjin Key Laboratory for Oceanic Meteorology, and Tianjin Institute of Meteorological Science, Tianjin 300074, China
  • 4Division of Landscape Architecture, Faculty of Architecture, The University of Hong Kong, Hong Kong SAR, 999077, China
  • 5Institute of Space and Earth Information Science and Department of Geography and Resource Management, The Chinese University of Hong Kong, Hong Kong SAR, 999077, China
  • 6Department of Mechanical Engineering, The University of Hong Kong, Pokfulam, Hong Kong SAR, 999077, China
  • 7Collaborative Innovation Centre on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol Cloud-Precipitation of China Meteorological Administration, School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China

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.

Fan Wang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-77', Anonymous Referee #1, 30 Apr 2022
  • RC2: 'Comment on egusphere-2022-77', Anonymous Referee #2, 06 May 2022

Fan Wang et al.

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Short summary
Unprecedented urbanization in China has led to serious urban heat island (UHI) issues, exerting intense heat stress on urban residents. We find diverse influences of aerosol pollution on urban heat island intensity (UHII) under different circulations. 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.