Response of urban heat island to future urban expansion over the Beijing–Tianjin–Hebei metropolitan area

• Published in: Applied geography (Sevenoaks) Vol. 70; pp. 26 - 36
• Main Authors: Wang, Juan, Huang, Bo, Fu, Dongjie, Atkinson, Peter M., Zhang, Xuezhen
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-05-2016
• Subjects: Beijing–Tianjin–Hebei metropolitan area; Climatology; Computer simulation; Land use/land cover; Mathematical models; Metropolitan areas; Urban areas; Urban environments; Urban expansion; Urban heat island; Urban heat islands; Weather forecasting; Weather research and forecast model; Urban expansion; Weather research and forecast model; Beijing–Tianjin–Hebei metropolitan area; Land use/land cover; Urban heat island
• ISSN: 0143-6228; 1873-7730
• DOI: 10.1016/j.apgeog.2016.02.010

Urban expansion plays a dominant role in the urban heat island (UHI) formation and is thus the essence and fundamental characteristic of the urban fabric. In this study, the responses of UHI to the urban expansion in the past decades were simulated using the coupled weather research forecast/urban canopy model (WRF/UCM) system from the 1980s to 2005 and in the future in 2050 embedded with the fine spatial resolution land use/land cover (LULC) datasets over the Beijing–Tianjin–Hebei (BTH) metropolitan area. With the urban expansion, the validations suggested that the designed models in this research can well simulate the generation and development of UHI. Due to urban expansion, the minimum temperature would rise by about 5 K in the newly developed areas. The temperature over the old urban areas would also increase (<1 K) because of the surrounding newly developed urban areas. The footprint of urban growth, in particular the minimum temperature, was clearly captured in the three scenarios by almost all the variables. These results were quite interesting, and it indicated a more uncomfortable urban environment in the future, especially at night, when the temperature changes are larger due to urban expansion.
•Fine spatial resolution LULC data in 2050 was predicted based on that in the 1980s and 2005.•The coupled WRF/UCM modeling system was embedded with the three-year LULC data.•Surface and air UHI shared consistent seasonal and diurnal variations, and can be observed distinctly in July and at night.•Significant effect of urbanization on the minimum temperature over the newly developed and old urban areas was quantified.