Spatial-temporal variation characteristics and attribution analysis of potential evapotranspiration in the Tabu River Basin
Received date: 2024-06-04
Revised date: 2024-08-09
Online published: 2024-09-25
Potential evapotranspiration (ET0) has an important impact on the hydrological cycle of the Tabu River Basin. Temporal and spatial variations in ET0 values in response to meteorological factors can inform water resource management in basins. For this study, daily meteorological data were collected from 7 meteorological stations in the Tabu River Basin and surrounding areas from 1981 to 2023. The Penman-Monteith (P-M) formula was used to estimate the ET0 to analyze temporal and spatial distribution patterns. The Beven sensitivity formula was used to calculate the sensitivity coefficient of seasonal and annual changes in ET0 to key meteorological factors and to explore trends in the sensitivity coefficient. Quantitative analysis was performed to determine the dominant factors affecting ET0 changes based on the relative changes in meteorological factors over time. The annual ET0 in the Tabu River Basin increased by 4.09 mm·(10a)-1, with a multiyear average of 1024.51 mm. Spatially, the annual ET0 was lowest in the southeast and highest in the northwest. The absolute values of the sensitivity coefficient of annual ET0 to various meteorological factors in decreasing order are relative humidity>maximum temperature>wind speed>sunshine hours>minimum temperature. The coefficients for relative humidity were highest for spring, autumn, and winter, while temperature had the highest coefficient for summer. The main factors affecting the change in annual ET0 were maximum temperature and wind speed, with contributions of 4.86% and-4.37%, respectively. On a seasonal scale, the main factors affecting ET0 changes in spring, summer, autumn, and winter were maximum temperature, wind speed, and relative humidity. An increase in maximum temperature and a decrease in relative humidity in the basin are the main reasons for the rise in ET0.
WANG Jiashuang , GAO Xiaoyu , LI Weiping , CHI Zhaonan , ZHANG Jiapeng , WU Yixuan . Spatial-temporal variation characteristics and attribution analysis of potential evapotranspiration in the Tabu River Basin[J]. Arid Zone Research, 2024 , 41(9) : 1538 -1547 . DOI: 10.13866/j.azr.2024.09.10
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