西藏地区潜在蒸散量时空格局特征及影响因素研究

doi:10.13866/j.azr.2021.03.14

Abstract

Abstract:

This study estimated potential evapotranspiration (ET₀) from 38 meteorological stations in Tibet. We collected the data from daily observations from 1981 to 2018 and analyzed it using the FAO’s Penman-Monteith formula. The temporal and spatial patterns of ET₀ and its influencing factors were analyzed separately from trend, sudden change, and periodicity. This study showed that within the time frame, ET₀ in Tibet decreased and then increased, and there was a significant decrease (except winter) and increase (except spring and summer). Spatially, there was a significant decrease during spring and summer, while in autumn, winter, and interannual, there was a significant increase. The mutation sites were mainly in the South-Central and North Eastern regions, and the time concentration was in the 1980s. The first major cycle of annual average ET₀ change may be 33 a(2013 year). Also, average wind speed and relative humidity were the dominant ET₀factors in the years and seasons. Simultaneously, the influence trend of average wind speed, relative humidity, and maximum temperature on ET₀ was consistent.

Key words: Tibet, potential evapotranspiration, tendency, partial correlation, influencing factors

SHI Jiqing,DOU Yongli,YANG Feiyun,DAI Rui,HU Jun. Temporal and spatial pattern characteristics of potential evapotranspiration in Tibet and its influencing factors[J].Arid Zone Research, 2021, 38(3): 724-732.

Figures/Tables 9

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References 29

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插值方法	误差方法	误差结果
Kriging	RMSE	6.27
	MAPE	43.79
	MRE	0.34
IDW	RMSE	7.49
	MAPE	49.13
	MRE	0.44
Spline	RMSE	7.69
	MAPE	52.97
	MRE	0.85

气象要素	时间尺度
气象要素	春季	夏季	秋季	冬季	年际
WS	0.797^**	0.821^**	0.813^**	0.791^**	0.754^**
RH	-0.700^**	-0.708^**	-0.709^**	-0.558^**	-0.605^**
T_max	0.239^**	0.212^**	0.217^**	0.254^**	0.187^**
T_min	0.094^**	0.115^**	0.053	0.021	0.041
T_ave	0.058	0.033	0.046	0.125^**	0.061
SD	0.018	0.048	0.035	0.037	0.099^**

Temporal and spatial pattern characteristics of potential evapotranspiration in Tibet and its influencing factors

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