Spatial-temporal characteristics and influencing factors of land surface temperature on the southern slope of Qilian Mountains from 2001 to 2022
Based on MOD11A2 data,DEM,land use type data,meteorological data(precipitation,air temper-ature and normalized difference vegetation index(NDVI)of Qilian Mountains from 2001 to 2022,land surface temperature(LST)were analyzed using trend analysis,linear regression and geographic probe model,and the driving factors of LST were discussed.The results show that:(1)In the time dimension,the LST on the south-ern slope of Qilian Mountains show upward trend from 2001 to 2022,and the LST warming rate in growing sea-son(from May to September)is higher than that in non-growing season.The daytime LST showed an insignifi-cant decline trend(-0.065 ℃/10a),the nighttime LST showed a significant increase trend(0.21 ℃/10a),while the annual LST increased at the rate of 0.072 ℃/10a.The monthly LST increased first and then decreased,and it was symmetrical with July as the turning point.(2)In the spatial dimension,the high LST regions are mainly distributed in the valley area.The decreasing rate of LST with elevation was 0.59 ℃/100 m.The order of LST from low to high was as follows:bare land＜water＜grassland＜forest land＜land of construction＜cultivated land.(3)Under the influence of single factor,altitude is the main factor affecting the change of LST,and air temperature is the second.The coupling of air temperature and precipitation had the greatest explanatory power(q=0.61).
land surface temperaturespatial and temporal variationsimpact factorssouthern slope of Qilian Mountains
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NSTL
万方数据
