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<p>Late-spring precipitation variability over East Asia has important implications for public safety, agriculture, and regional socioeconomic systems. A vortex street-like system east of the Tibetan Plateau (TPVSL) is known to shape extreme summer rainfall, yet its influence on spring precipitation remains unclear. Using daily reanalysis together with CHIRPS-2.0 satellite–gauge blended precipitation data and CPC gauge-based observations, we investigate the influence of strong and weak TPVSL events on May precipitation over East Asia. TPVSL-related cyclonic activity accounts for more than 80% of total rainfall across much of eastern China and exceeds 95% in core regions. Variations in TPVSL intensity are significantly correlated with May precipitation across East Asia. Intensified TPVSL activity is associated with stronger upstream westerlies south of the Tibetan Plateau, while downstream westerlies help maintain a stable propagation latitude. Satellite–gauge and gauge-based datasets provide consistent evidence of the TPVSL–rainfall relationship. TPVSL variability enhances upward motion and moisture transport along its propagation pathway, thereby promoting extreme May precipitation across East Asia. Monitoring TPVSL intensity and position may therefore improve flood forecasting and climate prediction of East Asian precipitation.</p>

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Late-spring rainfall over East Asia linked to variability in the Tibetan Plateau vortex street-like system

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Ruyu Gan,
  • Gang Huang

摘要

Late-spring precipitation variability over East Asia has important implications for public safety, agriculture, and regional socioeconomic systems. A vortex street-like system east of the Tibetan Plateau (TPVSL) is known to shape extreme summer rainfall, yet its influence on spring precipitation remains unclear. Using daily reanalysis together with CHIRPS-2.0 satellite–gauge blended precipitation data and CPC gauge-based observations, we investigate the influence of strong and weak TPVSL events on May precipitation over East Asia. TPVSL-related cyclonic activity accounts for more than 80% of total rainfall across much of eastern China and exceeds 95% in core regions. Variations in TPVSL intensity are significantly correlated with May precipitation across East Asia. Intensified TPVSL activity is associated with stronger upstream westerlies south of the Tibetan Plateau, while downstream westerlies help maintain a stable propagation latitude. Satellite–gauge and gauge-based datasets provide consistent evidence of the TPVSL–rainfall relationship. TPVSL variability enhances upward motion and moisture transport along its propagation pathway, thereby promoting extreme May precipitation across East Asia. Monitoring TPVSL intensity and position may therefore improve flood forecasting and climate prediction of East Asian precipitation.