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Two types of Tibetan Plateau vortex genesis in June and the associated mechanisms by Yiqiong Tang; Guoxiong Wu; Bian He; Yimin Liu; Jiangyu Mao; Tingting Ma is a Earth and Planetary Sciences article available to read on EtoBox.

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Abstract The Tibetan Plateau vortex (TPV) is a key system triggering rainfall over the Tibetan Plateau (TP) during the boreal summer. The TPV genesis mechanisms are complicated and its classification is a great challenge. This study attempts to elucidate these aspects. By introducing the standardized index of 24-h increment of equivalent potential temperature $$\Delta\_{24h} \theta\_{{\text{e}}}$$ Δ 24 h θ e at 500 hPa, all the TPV cases generated in June between 1980 and 2016 are classified as either positive or negative. Composite analysis is subsequently applied to the extremes of these two types, i.e., the first and last fifth-percentile cases with extremely negative and positive standardized $$\Delta\_{24h} \theta\_{{\text{e}}}$$ Δ 24 h θ e , respectively. Results indicate that 70% of them occur in relatively warmer and wetter environments, with diabatic heating dominating the positive type and the dynamic effect of large-scale circulation dominating the negative type. For the extremely positive cluster, the geopotential-height increment over the TP exhibits a negative/west–positive/east dipole, which enhances the southerly flow over the western TP, while forming surface water

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Author

Yiqiong Tang; Guoxiong Wu; Bian He; Yimin Liu; Jiangyu Mao; Tingting Ma

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)