Research on the Characteristics of Evapotranspiration and Climate Aridity Based on Remote Sensing Data in Yunnan-Guizhou Region

China Rural Water and Hydropower ›› 2021 ›› (1) : 98-104.

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Abstract

The monthly actual and potential evapotranspiration (ET) data products, including satellite-retrieved MODIS MOD16 data (actual ET MOD_ETa and potential ET MOD_ETp) and simulated by GLDAS (actual ET GLDAS_ETa and potential ET PM_ETp), are used to investigate the temporal and spatial variations of ET in the Yunnan and Guizhou (YG) region. Besides, multiple aridity indicator are computed based on observed precipitation (P) and ET data to investigate the climate aridity of YG, the relationship between evapotranspiration, precipitation and regional aridity evolution are also discussed. Results show that: ①The highest annual average ETa occurs in southern Yunnan followed by eastern Guizhou, and northern Yunnan has the least ETa. As for the trend of ETa, it inclines significantly in southwestern Yunnan and it declines significantly in northern Yunnan. ②The spatial distribution of annual average MOD_ETp and PM_ETp indicate that the spatial variation of ETp is not very much, while both data sets indicate that ETp has a remarkable rise in central and northern Yunnan. ③The trend analysis of multiple aridity indicators shows that climate aridity in Guizhou province is stable, while there is a considerable drying trend in central Yunnan because of the joint effects of significant decline of precipitation and ETa and the remarkable increase in ETp.

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actual evapotranspiration / potential evapotranspiration / aridity indicators / spatial-temporal distribution / Yunnan-Guizhou Plateau

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. Research on the Characteristics of Evapotranspiration and Climate Aridity Based on Remote Sensing Data in Yunnan-Guizhou Region. China Rural Water and Hydropower. 2021, 0(1): 98-104

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Received	Revised	Published
2020-03-22	2020-07-11	2021-01-15
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2021-02-21

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