资源环境科技发展态势分析平台

How can urban renewal effectively contribute to urban climate? Shanghai, one of the world's first metropolises to utilize effective urban heat island (UHI) mitigation strategies, is investigated by analyzing meteorological and land use observations over the past 144 years. The UHI decreased by similar to 0.58 degrees C between 2005 and 2016 due to urban renewal characterized by an increase in vegetation cover and the closure of the high-energy consumption industries in urban areas. Simulation results also indicate that future mitigation strategies should strive to increase vegetation cover, as a 10-20% increase in vegetation cover is anticipated to reduce the UHI by 0.38-0.78 degrees C, resulting in potential electricity savings of 3.05-5.79 x 10(8) kWh/year, which correspond to a carbon emissions reduction of 2.47-4.68 x 10(5) tCO(2)/year. The results will contribute to improve urban climate associated with large-scale urbanization and will provide guidance for urban renewal in other metropolises worldwide.

Plain Language Summary China has experienced substantial urbanization since 1960, which has led to a significant increase in urban heat islands (UHIs); therefore, considerable urban renewal has been undertaken to mitigate UHI, particularly in the economically developed eastern coastal regions. The impacts of urbanization, including both urban expansion and urban renewal, on the UHI are investigated by analyzing meteorological and land use observations in Shanghai over the past 144 years. Observations indicate that the UHI decrease by similar to 0.58 degrees C between 2005 and 2016 due to urban renewal, and a simulated reduction in the UHI of 0.38-0.78 degrees C is obtained via a 10-20% increase in vegetation cover, resulting in potential electricity savings of 3.05-5.79 x 10(8) kWh/year, which correspond to a carbon emissions reduction of 2.47-4.68 x 10(5) tCO(2)/year. The results will contribute to improve urban climate associated with large-scale urbanization and will provide guidance for urban renewal in other metropolises worldwide.