基于MOD16的山西省地表蒸散发时空变化特征分析

doi:10.18306/dlkxjz.2020.02.007

Abstract

Abstract:

Based on the MODIS evapotranspiration (ET) products (MOD 16) and the observation data of meteorological stations, coefficient of variation method and Sen+Mann-Kendall model were used to analyze the spatiotemporal feature, variation trends, and influencing factors of land surface ET and potential evapotranspiration (PET) in Shanxi Province from 2000 to 2014. The main conclusions are as follows: 1) The accuracy of the MOD16-ET (R ²=0.9) of Shanxi can meet the requirements of such research, and can be used to examine the spatiotemporal distribution of surface ET. 2) The mean annual ET and PET were 816.77 mm and 1608.46 mm, respectively. The annual distribution showed a unimodal pattern, which increased first and then decreased; the difference between ET and PET was the largest in May and June when it was the driest in the study area. 3) The annual average ET of the study area was low in northwest Shanxi and high in southeast, while the annual average PET was high in southwest and low in northeast of the study area. The overall difference between the annual average ET and PET was relatively large, which reflects that the whole province was shortage of water, especially in Xinzhou and the west of Lvliang. 4) The interannual variations of ET and PET have been relatively small in the past 15 years. Evapotranspiration showed a decreasing trend, and PET showed an increasing trend, which suggest that the drought was aggravated in Shanxi in the past 15 years. 5) The correlation analysis between evapotranspiration and meteorological factors indicated that the spatiotemporal variation of evapotranspiration was closely related to many climatic factors—they were related to precipitation and relative humidity spatially, and were most closely related to temperature and precipitation temporally.

Key words: evapotranspiration, potential evapotranspiration, spatiotemporal distribution, MOD16, Shanxi Province

WEN Yuanyuan, ZHAO Jun, WANG Yanqiang, WANG Yuchun, WANG Jianbang. Spatiotemporal variation characteristics of surface evapotranspiration in Shanxi Province based on MOD16[J].PROGRESS IN GEOGRAPHY, 2020, 39(2): 255-264.

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References 24

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变化趋势		面积占比/%				总计/%
变化趋势		不显著	弱显著	显著	极显著	总计/%
ET	增加	34.01	3.86	5.89	3.67	47.43
	减少	38.37	4.17	6.63	3.40	52.57
PET	增加	2.61	8.12	34.16	33.21	78.10
	减少	10.77	4.51	5.58	1.04	21.90

气象因子		降水	风速	气温	水汽压	相对湿度	日照时数
空间相关性	ET	0.73	0.23	0.35	0.39	0.46	-0.60
	PET	-0.23	-0.29	0.57	0.44	-0.48	-0.28
时间相关性	ET	0.81	-0.64	0.45	0.76	0.80	-0.18
	PET	0.68	0.40	0.93	0.74	-0.04	0.88

Spatiotemporal variation characteristics of surface evapotranspiration in Shanxi Province based on MOD16

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