西风-夏季风协同作用对青藏高原夏季降水的影响研究

doi:10.12118/j.issn.1000-6060.2025.180

Abstract

Abstract:

Using the CN05.1 precipitation dataset and the NCEP/NCAR reanalysis data, this study examines the spatiotemporal characteristics of summer precipitation on the Tibetan Plateau from 1981 to 2022 and explores the influence of westerly-monsoon synergy on this precipitation. The results show that: (1) Average summer precipitation over the past four decades is 216.6 mm, with a spatial pattern that decreases from the southeast to the northwest and an increasing trend of 4.85 mm per decade. The first empirical orthogonal function (EOF) mode indicates a spatially coherent change across the plateau, with a notable increase in wetness observed in the late 2010s, while the second EOF mode reveals pronounced interdecadal variability. (2) The westerly-monsoon synergy index provides a more robust indicator of summer precipitation over the plateau than individual westerly and monsoon indices, with a correlation coefficient of 0.5, effectively capturing interannual variability. (3) The westerly-monsoon synergy exerts a significant influence on summer precipitation over the Tibetan Plateau. When the synergistic effect strengthens, the upper-level divergent westerly circulation interacts with low-level warm and moist air transported by the westerlies, enhancing vertical ascent and promoting precipitation. Conversely, when the synergy is weak, anomalous easterly circulation dominates, accompanied by low-level dry and cold northerly flows, under which subsidence and moisture divergence suppress precipitation formation.

Key words: summer precipitation, summer monsoon, westerlies, water vapor transport, synergistic interaction, Tibetan Plateau

ZHANG Lu, ZHOU Bingrong, YAN Yuqian, CAO Xiaoyun, MA Youxuan. Impact of westerly-monsoon synergistic interaction on summer precipitation over the Tibetan Plateau[J].Arid Land Geography, 2026, 49(2): 332-342.

Figures/Tables 8

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Impact of westerly-monsoon synergistic interaction on summer precipitation over the Tibetan Plateau

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