A comparative study of atmospheric and surface urban heat island effects in China’s major cities

doi:10.12006/j.issn.1673-1719.2023.048

Abstract

Abstract:

With rapid urbanization in China, urban heat island effect is becoming increasingly severe, and the harm to the ecological environment and human health is also gradually strengthened. Taking 84 major cities in China as an example, the differences between the atmospheric and surface urban heat island effect were compared and analyzed by using meteorological observation and remote sensing data from 2007 to 2017. The main results are as follows. The average atmospheric heat island intensity during the day and night from 2007 to 2017 is 0.37℃ and 1.15℃ respectively, and the change trend was -0.10℃/(10 a) and -0.15℃/(10 a) respectively. The average surface heat island intensity reached 1.08℃ and 1.32℃ respectively, and the change trend was -0.03℃/(10 a) and 0.13℃/(10 a) respectively. There were obvious differences between atmospheric and surface urban heat island effect in intensity, spatial distribution, diurnal variation, seasonal variation and interannual variation trend. In addition, it was found that the existing national meteorological station observation data have the risk of underestimating the urban heat island effect. The results of this paper confirm the great temporal and spatial heterogeneity of atmospheric urban heat island effect in China and its difference from surface urban heat island effect in the temporal and spatial pattern, and emphasize the importance of carrying out multi- method integration research on a large scale, so as to comprehensively grasp the evolution law of urban heat island effect. In the future, it is necessary to strengthen the research on the high-density observation and driving mechanism of atmospheric urban heat island effect.

Key words: Atmospheric urban heat island effect, Surface urban heat island effect, MODIS, Comparative analysis

LI Yu, LI Ya-Qin, ZHAO Ju-Shuang. A comparative study of atmospheric and surface urban heat island effects in China’s major cities[J]. Climate Change Research, 2023, 19(5): 605-615.

Figures/Tables 6

Fig. 1 Spatial distribution of atmospheric and surface heat island intensity in major cities of China during 2007-2017

Fig. 2 Atmospheric (a1) and surface (a2) heat island intensity in different regions of China, and scatter diagram of atmospheric and surface heat island intensity of major cities in China during the day (b1) and night (b2) from 2007 to 2017

Fig. 3 Annual variation of atmospheric and surface heat island intensity in different regions of China from 2007 to 2017

Fig. 4 Distribution of interannual variation rate of atmospheric and surface heat island intensity based on stations in major cities of China from 2007 to 2017

Fig. 5 Interannual variation trend of atmospheric and surface heat island intensity in China from 2007 to 2017

Fig. 6 Scatter map of surface heat island intensity of China based on stations and urban-rural areas from 2007 to 2017

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