基于气象站和MODIS数据合肥地区城市热岛评价

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Abstract Based on the measured meteorological data from 1981 to 2020, the temporal and spatial trends of temperature and urban heat island (UHI) in urban and suburban areas of Hefei were studied. Combined with MODIS remote sensing data from 2000 to 2020, this paper verified the UHI in Hefei area, and then analyzed the correlation between land use/land cover (LULC) type and land surface temperature (LST), as well as the correlation between normalized vegetation index (NDVI) and LST. The results show that there was an obvious UHI effect over Hefei. The heat island area was in the center of the city, and the area expands with time. Both air temperature and surface temperature showed an upward trend, and the annual average temperature of urban and suburban increased by 2℃ and 1.5℃, respectively. The urban heat island intensity (UHII) is the highest in summer, reaching 1.7℃, while the effect was the weakest in winter. With the development of the city, the built-up area of Hefei increased by about 46.8%, while the green space area gradually decreased, and the green space area shows a significant negative correlation with the LST. During the daytime, there is a positive correlation between LST and NDVI. At night, the NDVI can slow down the temperature increase at night, showing a negative correlation. Based on the latest data, this study studies the temporal and spatial variations of temperature and heat island effect in Hefei, and discusses the effects of land use and vegetation cover on LST, which can provide reference for the study of urban thermal environment and the improvement of urban environment.

Key words： Hefei urban heat island land surface temperature remote sensing normalized difference vegetation index

Received: 24 March 2023

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	Articles by authors
	YANG Cui-qin
	HE Wei
	ZHU Mao-sheng
	JIA Zhen
	XU Zhao
	YANG Wen

Cite this article:

YANG Cui-qin,HE Wei,ZHU Mao-sheng等. Evaluation of urban heat island over Hefei based on meteorological observations and MODIS data[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(S1): 243-250.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/IS1/243

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