Abstract
This study investigated the seasonal variations of daytime urban thermal environment (UTE) based on land surface temperature (LST) in Shenzhen of 2015. The spatial and temporal adaptive reflectance fusion model (STARFM) was used for retrieving seasonal daytime LST at high spatiotemporal resolution by combining MODIS and HJ-1B LST data. Next, the relationship between the land cover and daytime in each season was examined. Finally, daytime LST patterns were classified, and the effects of seasonal variations of high-grade daytime LSTs were analyzed with landscape metrics. The results showed that (1) the STARFM is capable of generating seasonal daytime LST data at high spatiotemporal resolution. (2) Daytime LSTs were generally higher in the western parts of Shenzhen in spring and summer. (3) Daytime LST in each land cover type showed an increasing trend form winter to summer and decreased from summer to autumn. The highest and lowest daytime LSTs in each season were observed in ISAs and water bodies. (4) Landscape metrics provided a quantitative method for describing seasonal variations in daytime LSTs, and it was found that seasons influenced the intensity and extent of daytime LSTs in Shenzhen. These findings may be helpful for urban planners developing regional urban strategies to improve daytime urban thermal comfort conditions.
Highlights
More than 54% of the world’s population lives in urban areas according to the 2014 revision of the World Urbanization Prospects of the United Nations [1]. is proportion will likely grow in the future, in developing countries [2]. us, urban areas are continuously growing, and a large amount of natural vegetation coverage converted to various impervious surfaces areas (ISAs) will likely result in a series of human living environmental and ecological issues [3]. e urban thermal environment (UTE) is an important part of the urban ecoenvironment, which could be altered by urbanization and industrialization [4]. e UTE could potentially be changed by air pollution, industrial waste heat, land use/cover change (LUCC), and other factors [5]
Conclusions is paper uses the spatial and temporal adaptive reflectance fusion model (STARFM) to produce high-spatiotemporal resolution daytime land surface temperature (LST) by combining Moderateresolution Imaging Spectroradiometer (MODIS) and HJ1B LST data to study the seasonal variations of the daytime UTE in Shenzhen in tropical regions covered by clouds and rainy weather throughout the year. e objective was to examine the seasonal variations of the daytime LST to different land cover types and assess the effects of seasonal variations of high-grade daytime LST using landscape metrics
Several conclusions were made as follows: (1) e predicted seasonal LST products can be used for monitoring the variation of daytime LST in urban thermal environment
Summary
More than 54% of the world’s population lives in urban areas according to the 2014 revision of the World Urbanization Prospects of the United Nations [1]. is proportion will likely grow in the future, in developing countries [2]. us, urban areas are continuously growing, and a large amount of natural vegetation coverage converted to various impervious surfaces areas (ISAs) will likely result in a series of human living environmental and ecological issues [3]. e urban thermal environment (UTE) is an important part of the urban ecoenvironment, which could be altered by urbanization and industrialization [4]. e UTE could potentially be changed by air pollution, industrial waste heat, land use/cover change (LUCC), and other factors [5]. Us, urban areas are continuously growing, and a large amount of natural vegetation coverage converted to various impervious surfaces areas (ISAs) will likely result in a series of human living environmental and ecological issues [3]. E UTE could potentially be changed by air pollution, industrial waste heat, land use/cover change (LUCC), and other factors [5]. With increasing trends of climate warming in urban areas over the last 50 years, higher temperatures lead to a series of changes in the urban environment, such as accelerated formation of polluted air and change in the energy budget at the ground surface, and generate a great amount of anthropogenic waste heat, contributing to global warming [6]. One consequence of UTE change due to urbanization is the urban heat island (UHI). In order to fight the UHI and its detrimental consequences, various strategies have been developed, such as using permeable and reflective pavements
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