Spatiotemporal variation of potential evapotranspiration and its dominant factors during 1970-2020 across the Sichuan-Chongqing region, China.

Although summer PET exhibited an increasing trend from 1970 to 2020, 35 stations showed negative trends in summer PET, 11 of which were significant decreases.

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A negative trend in PET was found at 23 stations (41.1%); the trend was statistically significant at eight stations (14.3%) at a 95% confidence level.

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In the SC-CQ region, on a seasonal scale, more sites showed an increasing trend than a decreasing trend, except in summer, which confirmed the existence of the evaporation paradox generally in the months of summer.

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Moreover, a relatively low S Ws was found in the SC-CQ region, while changes in W s were found to play a significant role in the PET changing as the W s of most stations showed a significant trend ( Fig 5 ).

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There was a positive trend in PET for approximately 58%, 68%, 38%, 73% and 73% of all surveyed stations at annual, spring, summer, autumn and winter, respectively.

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