Abstract
Reference evapotranspiration (ET0) is an important parameter for characterization of the hydrological cycle, and it is also important for agricultural, environmental, and other studies. In this study, by collecting the daily meteorological data of 31 base stations in high-altitude areas of Tibet for 35 consecutive years, the daily reference crop evapotranspiration (ET0) of each base station is calculated by the ASCE Penman-Monteith formula. The Mann-Kendall method is applied primarily to test the trend of meteorological elements and ET0. In addition, the software ArcGIS was used to generate spatial interpolation distribution maps of meteorological elements and ET0 so that the spatio-temporal variation trend of each base station is carried out. The ET0 in Shigatse shows an insignificant downward trend, while the other six regions show an upward trend, which is related to temperature and humidity directly with R2 of 0.23 and 0.67. The relative humidity (RH) and sunshine duration (SD) in Tibet show an overall three-step distribution in the east, middle, and west with RH decreasing from east to west and SD increasing from east to west. Annual cumulative ET0 of Ngari is the largest and decreases from west to east gradually, while ET0 increasing from east (lower elevation) to west (higher elevation) of Tibet with ranging from 730 to 1255 mm/year. This study not only is important for understanding of ET0 changes but also provides the preliminary and elementary reference for agricultural water management in Tibet with high elevation.
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Data availability
The datasets used during the current study are available from the corresponding author on reasonable request.
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The contributions of the editor and anonymous reviewers whose comments and suggestions significantly improved this article are also appreciated.
Funding
This research was supported by the Second Tibetan Plateau Scientific Expedition and Research Program (2019QZKK0207), Visiting Researcher Fund Program of State Key Laboratory of Water Resources and Hydropower Engineering Science (2018NSG01), and Science Researching fund projects of China institute of water resources and Hydropower research (MK2020J04).
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Pengcheng Tang: Conceived and designed research ideas, analyzed the data and wrote the paper
Bing Xu: Conceived and designed research ideas, analyzed the data and wrote the paper
Delong Tian: Conceived and designed research ideas and wrote the paper
Jie Ren: Data collection and Wrote the paper
Zekun Li: Data collection
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Tang, P., Xu, B., Tian, D. et al. Temporal and spatial variations of meteorological elements and reference crop evapotranspiration in Alpine regions of Tibet, China. Environ Sci Pollut Res 28, 36076–36091 (2021). https://doi.org/10.1007/s11356-021-12771-7
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DOI: https://doi.org/10.1007/s11356-021-12771-7