1980—2017年青海省地表温度时空变化特征

doi:10.13866/j.azr.2021.01.19

Abstract

Abstract:

Land surface temperature is an important factor affecting the regional climate, agricultural production, and soil nutrients. It is of great significance to analyze the variation law of ground temperature to understand the causes of climate change and the layout of agricultural production. The characteristics of land surface temperature change and its relationship with the meteorological factor in the Qinghai Province were studied by using linear trend analysis, the Mann-Kendall mutation test, and wavelet analysis based on the data of daily land surface temperature, air temperature, and wind speed data from 35 meteorological stations in the study area from 1980 to 2017. The results showed that: (1) The annual average land surface temperature in Qinghai Province showed a fluctuating and rising trend at a rate of 0.68 °C·(10a)^-1（P<0.01）, and the mutation point was in 2001. There was a significant seasonal difference in the change of surface temperature, and the rate of change was most obvious in winter, which was 0.77 °C· (10a)^-1 (P<0.01). There was little difference in the other seasons. The average annual land surface temperature of Qinghai Province was based on two periodic changes of 4-7 a and 11-16 a. (2) The average annual land surface temperature of two low-temperature centers in the Qingnan plateau and Qilian mountain area was compared with two high-temperature centers of the Qaidam Basin and Eastern agricultural area, and the rate of temperature increase of the low-temperature center was faster. (3) The annual and quarterly average land surface temperatures had a significant positive correlation with the average temperature but were negatively correlated with wind speed and altitude. (4) The average surface temperature showed an obvious vertical decreasing pattern, and the warming trend was more obvious in areas with high altitude.

Key words: land surface temperature, spatial-temporal changes, altitude, Qinghai Province

ZHAO Meiliang,CAO Guangchao,CAO Shengkui,LIU Fugang,YUAN Jie,ZHANG Zhuo,DIAO Erlong,FU Jianxin. Spatial-temporal variation characteristics of land surface temperature in Qinghai Province from 1980 to 2017[J].Arid Zone Research, 2021, 38(1): 178-187.

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	全年	春季	夏季	秋季	冬季
气温	0.964^**	0.943^**	0.971^**	0.942^**	0.948^**
风速	-0.604^**	-0.648^**	-0.583^**	-0.644^**	-0.045
海拔	-0.851^**	-0.891^**	-0.855^**	-0.805^**	-0.549^**

时间尺度	回归方程	R²	P值	标准误差
全年	y=1.22x+2.95	0.93	P<0.01	0.13
春季	y=1.21x+3.96	0.89	P<0.01	0.14
夏季	y=1.2x+2.74	0.94	P<0.01	0.15
秋季	y=1.11x+2.47	0.89	P<0.01	0.13
冬季	y=x+0.98	0.9	P<0.01	0.18

Spatial-temporal variation characteristics of land surface temperature in Qinghai Province from 1980 to 2017

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