首页|The interannual periodicity of precipitation and its links to the large-scale circulations over the Third Pole

The interannual periodicity of precipitation and its links to the large-scale circulations over the Third Pole

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To understand the spatio-temporal variability of precipitation(P)in the Third Pole region(centered on the Tibetan Plateau-TP),it is necessary to quantify the interannual peri-odicity of P and its relationship with large-scale circulations.In this study,Morlet wavelet transform was used to detect significant(p＜0.05)periodic characteristics in P data from me-teorological stations in four climate domains in the Third Pole,and to reveal the major large-scale circulations that triggered the variability of periodic P,in addition to bringing large amounts of water vapour.The wavelet transform results were as follows.(1)Significant quasi-periodicity varied from 2 to 11 years.The high-frequency variability mode(2 to 6 years qua-si-periods)was universal,and the low-frequency variability mode(7 to 11 years quasi-periods)was rare,occurring mainly in the westerlies and Indian monsoon domains.(2)The majority of periods were base periods(53％),followed by two-base periods.Almost all stations in the Third Pole(95％)showed one or two periods.(3)Periodicity was widely detected in the ma-jority of years(84％).(4)The power spectra of P in the four domains were dominated by sta-tistically significant high-frequency oscillations(i.e.,with short periodicity).(5)Large-scale circulations directly and indirectly influenced the periodic P variability in the different domains.The mode of P variability in the different domains was influenced by interactions between large-scale circulation features and not only by the dominant circulation and its control of water vapour transport.The results of this study will contribute to better understanding of the causal mechanisms associated with P variability,which is important for hydrological science and water resource management.

precipitationinterannual periodicityMorlet waveletlarge-scale circulationsThird Pole

LIANG Liqiao、LIU Qiang、LI Jiuyi

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State Key Laboratory of Tibetan Plateau Earth System,Environment and Resources(TPESER),Institute of Tibetan Plateau Research,CAS,Beijing 100101,China

State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,China

Key Laboratory for Water and Sediment Sciences,Ministry of Education,School of Environment,Beijing Normal University,Beijing 100875,China

Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Basic Research and Development Project

42271141420711292022YFF1300902

2024

10.1007/s11442-024-2256-5

地理学报(英文版)
中国地理学会,中国科学院地理科学与资源研究所

地理学报(英文版)

CSTPCD
影响因子：1.307
ISSN：1009-637X
年,卷(期)：2024.34(8)
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