An urban heat island study in Nanchang City, China based on land surface temperature and social-ecological variables
An urban heat island study in Nanchang City, China based on land surface temperature and social-ecological variables
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DOI：
10.1016/j.scs.2017.05.005
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发表时间：
2017-07-01
影响因子：
11.7
通讯作者：
Murayama, Yuji
中科院分区：
文献类型：
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作者：
Zhang, Xinmin;Estoque, Ronald C.;Murayama, Yuji
研究了城市热岛效应下南昌市地表温度的时空分布特征。它还调查了LST与六个社会生态变量，即土地利用/土地覆盖（LULC），植被指数，不透水面指数，水指数，人口密度和化石燃料CO2排放量的关系。使用了2000年和2013年捕获的陆地卫星数据和地理信息系统技术来促进分析。结果显示，2000年至2013年期间，研究区域的整体平均LST增加了1.64摄氏度。LST的这种时间变化可能受到拍摄源卫星图像时的特定环境条件的影响。也就是说，有迹象表明，检测到的整体平均LST的增加受到该地区快速城市化的影响，导致不透水表面迅速扩大，绿色空间减少。在这两个时间点，城市LULC类（不透水表面）有一个一致的高LST和所有其他的社会生态变量检查与LST有统计学意义的关系。我们建议在城市未来发展的景观和城市规划过程中考虑到这些变量。本研究还强调了城市绿色空间的重要性，因为它们能够减轻城市热岛效应，并为人们提供有价值的生态系统服务。城市绿色空间有助于提高城市的整体宜居性和环境可持续性。
This article examines the spatial and temporal patterns of land surface temperature (LST) in Nanchang City, China in the context of the urban heat island (UHI) phenomenon. It also investigates the relationship of LST with six social-ecological variables, namely land use/land cover (LULC), vegetation index, impervious surface index, water index, population density, and fossil-fuel CO2 emission. Landsat data captured in 2000 and 2013 and geographic information systems techniques were used to facilitate the analysis. The results show that the overall mean LST in the study area increased by 1.64 degrees C between 2000 and 2013. This temporal variation in LST might have been influenced by the given environmental conditions at the time when the source satellite images were captured. That said, there have been indications that the detected increase in the overall mean LST has been influenced by the rapid urbanization of the area, resulting in the rapid expansion of impervious surfaces and loss of green spaces. In both time points, the urban LULC class (impervious surfaces) had a consistent high LST and all the other social-ecological variables examined had statistically significant relationships with LST. We recommend that these variables be taken into consideration in the landscape and urban planning process for the future development of the city. This study also emphasizes on the importance of urban green spaces because of their ability to mitigate UHI effects and the valuable ecosystem services they generate for and provide to people. Urban green spaces can help improve the overall livability and environmental sustainability of cities.