Climate Change Research ›› 2021, Vol. 17 ›› Issue (1): 45-57.doi: 10.12006/j.issn.1673-1719.2020.163

• Mitigation Pathways and Policies in China with the Paris Agreement Targets • Previous Articles     Next Articles

Mitigation effect of different cool roof schemes on thermal environment of urban agglomeration

ZHANG Mi1(), MA Hong-Yun1(), LIN Hui-Jiao1, LI Hai-Jun2, WANG Ying1   

  1. 1 Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD) / Key Laboratory of Meteorological Disaster, Ministry of Education (KLME) / Institute for Climate and Application Research (ICAR), Nanjing University of Information Science and Technology, Nanjing 210044, China
    2 Jiangxi Meteorological Bureau, Nanchang 330000, China
  • Received:2020-07-30 Revised:2020-09-30 Online:2021-01-30 Published:2021-02-04
  • Contact: MA Hong-Yun;


In this paper, a mesoscale numerical model coupled with a single-layer urban canopy model (WRF/UCM) was used to conduct sensitivity tests on eight roof cooling schemes with different albedo and greening ratio to simulate the impact of different cooling roof schemes on the urban thermal environment of Yangtze River Delta urban agglomeration in summer of 2013, and the influence mechanism was also analyzed. The results show that: there is a strong linear relationship between the mitigation effect of different cooling roof schemes on urban agglomeration thermal environment and the roof parameters, and the mitigation effect on heat-wave is better than that on normal summer under the same scheme. During heat wave, the cooling degree days of HR4 (albedo of 1.0) and GR4 (green fraction of 100%) are reduced by 14.7% and 10.9%, respectively, which saves more energy than normal summer. Heat-wave can enhance the intensity of heat island, and the high albedo roof scheme can reduce the heat island by 1.36℃ in the daytime. On average, the cooling effect of high albedo roof and roof greening increased by 38.5% and 34.9%, respectively, and the humidification effect increased by 29.5% and 21.9%, respectively. This is mainly because the former can reduce more net radiation flux in heat wave, and the latter can release more latent heat flux in heat wave. In addition, the cooling effect of dense urban grid areas is better than that of scattered urban areas. The average cooling range of Changzhou area in urban agglomeration is 32% higher than that of Hangzhou area.

Key words: Heat wave, Cool roof, Urban heat island, Mitigation effect

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