Rapid Intensification of Persistent Extreme Precipitation Over the Eastern Periphery of the Tibetan Plateau After 2000: The Role of Southwest Vortices

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-09-25 DOI:10.1029/2025GL115511

Ruiyu Zhao, Bin Chen, Yang Zhao, Wei Zhang, Xiangde Xu, Yueqing Li

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Abstract

A notable increase in the intensity of Persistent Extreme Precipitation (PEP) events over the Eastern Periphery of the Tibetan Plateau (EPTP) is observed after 2000, which is strongly linked to the changes in Southwest Vortices (SWVs). A composited diagnostic of multiple SWVs is carried out in conjunction with the PEP. The Vorticity Vertical Transport (VVT) and Divergence (DIV) terms have a positive impact on the growth of SWVs, whereas the Relative Vorticity Advection (RVA) and Vorticity Tilt (VT) have a negative effect. Although all four terms are related to the variability of SWV intensity, DIV and RVA are the primary contributors to the increased trend in SWVs after 2000, accounting for up to 79.4% of the variation. The changes in meridional wind are thereby the main driver of the upward trend in PEP intensity, since it acts as the primary determinant of the long-term variations in the DIV and RVA.

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与PEP一起对多个swv进行综合诊断。涡度垂直输送（VVT）和辐散（DIV）项对swv的增长有积极影响，而相对涡度平流（RVA）和涡度倾斜（VT）项对swv的增长有消极影响。虽然这四个术语都与SWV强度的变化有关，但DIV和RVA是2000年后SWV增加趋势的主要贡献者，占变化的79.4%。经向风的变化是PEP强度上升趋势的主要驱动因素，因为它是DIV和RVA长期变化的主要决定因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.