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Abstract
Abstract
Urban expansion and climate change can considerably influence the regional thermal environment. In this study, the effects of changes in land cover type and vegetation coverage (referred to as LU for short), gridded anthropogenic heat (AH) emission and future climate change on atmospheric thermal environment in a Chinese megacity, Hefei, are investigated by Weather Research and Forecasting (WRF)/Urban Canopy Model (UCM) model. It is found that the increase of surface sensible heat in old urban areas is contributed by AH emission, while that in new urban areas is attributed to LU change. The LU change in new urban areas can lead to the decreased latent heat flux due to the reduction of vegetation coverage and the increase of impervious land surface. The contribution of LU change to the summer UHI intensity is about 0.76 ℃, and AH emission to that is about 0.17 ℃. The combined effects of LU change and AH emission in old urban areas are greater than those in new urban areas, leading to changes in daily mean 2-m air temperature, 2-m relative humidity (RH), and heat index in old (new) urban areas to be 1.08 ℃ (0.75 ℃), – 5.93% (– 4.96%), and 2.77 ℃ (1.76 ℃), respectively. At the end of the twenty-first century, the urban air temperature under RCP 4.5 (RCP 8.5) scenario is 0.7 ℃ (3 ℃) higher than that at present.
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; Ma Yaoming 3 ; Fu Yunfei 1 ; Chen, Mingxing 4 ; Ma, Weiqiang 5 ; Zhao, Chun 1 ; Huang, Ziyu 1 ; Zhou Keqi 1 1 University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China (GRID:grid.59053.3a) (ISNI:0000000121679639)
2 University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China (GRID:grid.59053.3a) (ISNI:0000000121679639); CAS Center for Excellence in Comparative Planetology, Hefei, China (GRID:grid.59053.3a) (ISNI:0000000121679639); Jiangsu Collaborative Innovation Center for Climate Change, Nanjing, China (GRID:grid.41156.37) (ISNI:0000 0001 2314 964X)
3 Chinese Academy of Science, Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Beijing, China (GRID:grid.9227.e) (ISNI:0000000119573309); CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China (GRID:grid.511503.3); University of Chinese Academy of Science, College of Earth and Planetary Sciences, Beijing, China (GRID:grid.410726.6) (ISNI:0000 0004 1797 8419); Lanzhou University, Frontier Center for Eco-Environment and Climate Change in Pan-Third Pole Regions, Lanzhou, China (GRID:grid.32566.34) (ISNI:0000 0000 8571 0482)
4 CAS, Institute of Geographic Sciences and Natural Resources Research, Beijing, China (GRID:grid.9227.e) (ISNI:0000000119573309)
5 Chinese Academy of Science, Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Beijing, China (GRID:grid.9227.e) (ISNI:0000000119573309); CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China (GRID:grid.511503.3)