Research article |
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Wind regime features and their impacts on the middle reaches of the Yarlung Zangbo River on the Tibetan Plateau, China |
ZHANG Yan1,2, ZHANG Zhengcai3,4,*(), MA Pengfei5, PAN Kaijia2,3, ZHA Duo6, CHEN Dingmei6, SHEN Caisheng7, LIANG Aimin4 |
1Institute of Atmosphere Physics, Chinese Academy of Sciences, Beijing 100029, China 2University of Chinese Academy of Sciences, Beijing 100083, China 3Key Laboratory of Desert and Desertification, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China 4Shaanxi Normal University, Xi'an 710119, China 5Tibet Climate Center, Lhasa 850000, China 6Shannan Meteorological Bureau, Shannan 856000, China 7Policy Research Office of Party Committee of Tibet Autonomous Region, Lhasa 850000, China |
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Abstract The wide valley of the Yarlung Zangbo River is one of the most intense areas in terms of aeolian activity on the Tibetan Plateau, China. In the past, the evaluation of the intensity of aeolian activity in the Quxu-Sangri section of the Yarlung Zangbo River Valley was mainly based on data from the old meteorological stations, especially in non-sandy areas. In 2020, six new meteorological stations, which are closest to the new meteorological stations, were built in the wind erosion source regions (i.e., sandy areas) in the Quxu-Sangri section. In this study, based on mathematical statistics and empirical orthogonal function (EOF) decomposition analysis, we compared the difference of the wind regime between new meteorological stations and old meteorological stations from December 2020 to November 2021, and discussed the reasons for the discrepancy. The results showed that sandy and non-sandy areas differed significantly regarding the mean velocity (8.3 (±0.3) versus 7.7 (±0.3) m/s, respectively), frequency (12.9% (±6.2%) versus 2.9% (±1.9%), respectively), and dominant direction (nearly east or west versus nearly north or south, respectively) of sand-driving winds, drift potential (168.1 (±77.3) versus 24.0 (±17.9) VU (where VU is the vector unit), respectively), resultant drift potential (92.3 (±78.5) versus 8.7 (±9.2) VU, respectively), and resultant drift direction (nearly westward or eastward versus nearly southward or northward, respectively). This indicated an obvious spatial variation in the wind regime between sandy and non-sandy areas and suggested that there exist problems when using wind velocity data from non-sandy areas to evaluate the wind regime in sandy areas. The wind regime between sandy and non-sandy areas differed due to the differences in topography, heat flows, and their coupling with underlying surface, thereby affecting the local atmospheric circulation. Affected by large-scale circulations (westerly jet and Indian monsoon systems), both sandy and non-sandy areas showed similar seasonal variations in their respective wind regime. These findings provide a credible reference for re-understanding the wind regime and scientific wind-sand control in the middle reaches of the Yarlung Zangbo River Valley.
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Received: 06 April 2023
Published: 31 October 2023
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Corresponding Authors:
*ZHANG Zhengcai (E-mail: zhangzhengcai@snnu.edu.cn)
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Cite this article:
ZHANG Yan, ZHANG Zhengcai, MA Pengfei, PAN Kaijia, ZHA Duo, CHEN Dingmei, SHEN Caisheng, LIANG Aimin. Wind regime features and their impacts on the middle reaches of the Yarlung Zangbo River on the Tibetan Plateau, China. Journal of Arid Land, 2023, 15(10): 1174-1195.
URL:
http://jal.xjegi.com/10.1007/s40333-023-0066-8 OR http://jal.xjegi.com/Y2023/V15/I10/1174
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