The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect

Han, Wenchao; Li, Zhanqing; Wu, Fang; Zhang, Yuwei; Guo, Jianping; Su, Tianning; Cribb, Maureen; Fan, Jiwen; Chen, Tianmeng; Wei, Jing; Lee, Seoung-Soo

doi:https://doi.org/10.5194/acp-20-6479-2020

Articles | Volume 20, issue 11

Atmos. Chem. Phys., 20, 6479–6493, 2020

https://doi.org/10.5194/acp-20-6479-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Atmos. Chem. Phys., 20, 6479–6493, 2020

https://doi.org/10.5194/acp-20-6479-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 11

Research article 05 Jun 2020

Research article | 05 Jun 2020

The mechanisms and seasonal differences of the impact of aerosols on daytime surface urban heat island effect

Wenchao Han et al.

Supplement

https://doi.org/10.5194/acp-20-6479-2020-supplement

Data sets

EARTHDATA NASA https://search.earthdata.nasa.gov/

Hourly PM2.5 data Ministry of Ecology and Environment of China http://106.37.208.233:20035

NCEP FNL Operational Model Global Tropospheric Analyses, continuing from July 1999 NCEP https://doi.org/10.5065/D6M043C6

Short summary

Observational data and model simulation were used to analyze the daytime urban heat island intensity (UHII) under polluted and clean conditions in China. We found that aerosols reduce the UHII in summer but increase the UHII in winter. Two mechanisms, the aerosol radiative effect (ARE) and the aerosol dynamic effect (ADE), behave differently in summer and winter. In summer, the UHII is mainly affected by the ARE, and the ADE is weak, and the opposite is the case in winter.