TY - JOUR
T1 - Circulation-regulated impacts of aerosol pollution on urban heat island in Beijing
AU - Wang, Fan
AU - Carmichael, Gregory R.
AU - Wang, Jing
AU - Chen, Bin
AU - Huang, Bo
AU - Li, Yuguo
AU - Yang, Yuanjian
AU - Gao, Meng
N1 - This study was supported by grants from Research Grants Council of the Hong Kong Special Administrative Region, China (project nos. HKBU22201820 and HKBU12202021), National Natural Science Foundation of China (grant no. 42005084) and Natural Science Foundation of Guangdong Province (grant no. 2019A1515011633).
PY - 2022/10
Y1 - 2022/10
N2 - Unprecedented urbanization in China has led to serious urban heat island (UHI) issues, exerting intense heat stress on urban residents. Based on the 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 in both daytime and nighttime and it is less affected by aerosol concentrations. 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 nighttime. It could thus be targeted for cooperative management of heat islands and aerosol pollution.
AB - Unprecedented urbanization in China has led to serious urban heat island (UHI) issues, exerting intense heat stress on urban residents. Based on the 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 in both daytime and nighttime and it is less affected by aerosol concentrations. 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 nighttime. It could thus be targeted for cooperative management of heat islands and aerosol pollution.
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85141944107&origin=inward
U2 - 10.5194/acp-22-13341-2022
DO - 10.5194/acp-22-13341-2022
M3 - Journal article
SN - 1680-7316
VL - 22
SP - 13341
EP - 13353
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
IS - 20
ER -