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Study of the temporal and spatial evolution law of land surface temperature in China |
Bing ZHAO1, Kebiao MAO2(), Yulin CAI1, Xiangjin MENG3 |
1. Geomatics College, Shandong University of Science and Technology, Qingdao 266590, China 2. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China 3. School of Surveying and Geo-Informatics, Shandong Jianzhu University, Jinan 250100, China |
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Abstract Land surface temperature (LST) is a key parameter in the surface environment and atmospheric energy exchange system, and it plays an important role in agricultural information monitoring and agro-meteorological disaster research. Due to the interference of factors such as clouds, there are a large number of missing and low-quality pixels in the thermal infrared surface temperature data. Therefore, this study used reconstructed high-quality MODIS surface temperature data as the data source, from 2003 to 2017 year, day and night and season. The spatial and temporal distribution characteristics and long-term variation pattern of China’s surface temperature during 15 years were analyzed systematically on different time scales. The results are as follows: ①During the period of 2003—2017, the surface temperature change in China showed a slight increase in temperature, with an average annual increase of 0.011 ℃, of which 63.7% showed a trend of warming. ②In addition, China’s warming trend is significantly uneven, with the overall characteristics of “the north is greater than the south and the west is greater than the east”. The significant warming is mainly concentrated in the central and western parts of the Inner Mongolia Plateau in the northwestern region, the southern part of Tibet, and the Huanghuaihai Plain (slope k>0.07 ℃·a-1, R>0.6). In addition, the region with the largest temperature drop is concentrated in the vicinity of the Songnen Plain in the northeastern region (change slope k<-0.06 ℃·a-1, R>0.55). ③On the seasonal scale, the warming trend in winter is the fastest, with the most significant in the western region, followed by spring, while the warming trend in autumn and summer does not change much.
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Keywords
land surface temperature
time and space change
MODIS
China
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Corresponding Authors:
Kebiao MAO
E-mail: maokebiao@caas.cn
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Issue Date: 18 June 2020
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