四川盆地周边大尺度地形对特定天气模式下区域夏季极端降水的影响:多案例研究

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Xiaoke Xu, Anning Huang, Yan Zhang, Xianyu Yang, Wei Zhao
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引用次数: 0

摘要

四川盆地周边大尺度地形对夏季区域性小时极端降水(RHEPEs)两种主要天气模式下降水的影响机制尚不清楚。在多情景模拟的基础上,通过敏感性试验揭示了青藏高原和云贵高原在夏季不同优势天气模式下对南海降水的影响。结果表明:在南海西部低空低涡(LLV)和水汽由南风输送的天气模式下,YGP和TP分别能使南海西部降水增加86%和46%;TP和YGP的大尺度地形倾向于增强高原和盆地之间的热梯度,并形成南海西部的迎风坡,导致那里的降水增加。在西南偏风的南海中东部低压天气模式下,青藏高原对东南偏风坡大气环流的影响有限,仅能使东南偏风区降水增加20%,而青藏高原可使东南偏风区降水减少26%,这主要是由于异常东北风减弱了孟加拉湾水汽输送。导致南海东部迎风坡层积稳定性增强,动力隆升减弱。本研究结果为研究大尺度地形对SCB上RHEPEs的影响机制提供了新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of Large-Scale Topography Surrounding the Sichuan Basin on Its Regional Hourly Extreme Precipitation in Summer Under Specific Weather Patterns: Multi-Case Study

The influence mechanism of large-scale topography surrounding the Sichuan Basin (SCB) on its precipitation under two dominant weather patterns that typically trigger the regional hourly extreme precipitation events (RHEPEs) in summer remains unclear. Based on multi-case simulations, this study revealed how the Tibetan Plateau (TP) and Yunnan–Guizhou Plateau (YGP) affect the precipitation over SCB under different dominant weather patterns of RHEPEs in summer through sensitivity experiments. Results show that under the weather pattern featured by a low-level vortex (LLV) over western SCB with water vapor transport by southerly winds, the YGP and TP can increase the precipitation in western SCB by 86% and 46%, respectively. The large-scale terrains of TP and YGP tend to enhance the thermal gradient between the plateau and basin and shape the windward slope over western SCB, accounting for increased precipitation there. Under the weather pattern featured by a LLV over central and eastern SCB with southwesterly winds, the TP can only increase the precipitation in the eastern SCB by 20% due to its limited effects on the atmospheric circulations along the windward slope there, however, the YGP can decrease the precipitation in eastern SCB by 26%, which is attributed to the anomalous northeasterly winds weakening the water vapor transport from the Bay of Bengal, leading to the strengthened stability of stratification and weakened dynamic uplifting along the windward slope in eastern SCB. Finding of this study provides a new perspective on the mechanisms of large-scale terrain influencing the RHEPEs over SCB.

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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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