The influence of urban scale spatial morphology on thermal environment ind Zhengzou, China – A case study
Megjelenés dátuma: 2019
Kulcsszó: urbanization
urban climate
urban thermal environment
Zhengzhou City
Egyetemi Meteorológiai Füzetek
urban climate
urban thermal environment
Zhengzhou City
Egyetemi Meteorológiai Füzetek
Abstract:
In recent years, due to the fast urbanization, the urban spatial morphology has changed a lot in many cities of China, which results in a great impact on the urban climate. The urban thermal environment in Zhengzhou City, which is a fast-growing provincial capital city, has also deteriorated in recent years with the urbanization process and global warming. Since 1992, urban temperature has increased significantly, and there is a significant positive correlation between urban heat island intensity and urban construction indicators in Zhengzhou (Zhang et al., 2016).
According to the traditional definition, the urban heat island intensity refers to the difference between urban and rural temperatures. However, the definition between urban and rural is very general. Usually, cities or villages still contain many different kinds of surface coverage. For example, urban areas include architectural areas, roads, urban parks, etc. And rural areas include farmland, settlement, forests, etc. The temperature in urban or rural areas may be different in different studies. It makes difficult to compare the results obtained in the different studies of the world (Stewart, 2011).
In order to solve this problem, Stewart & Oke (2012) developed a classification, the local climate zone (LCZ) system, which is based on the earlier works of Auer (1978), Ellefsen (1991) and Oke (2004). With this method, the land surfaces are divided into 17 types, and the measured temperature is standardized, which makes research in different areas more comparable.
In this study, we classified the urban surface of Zhengzhou City with the LCZ classification method and estimated the land surface temperature (LST). Based on the LCZ classification results and urban surface temperature, we calculated the urban heat island intensity and its distribution in Zhengzhou City in summer and winter. Finally, the temperature characteristics in different LCZs were analyzed.