中国科学院青藏高原研究所陈学龙团队课题组不断了青藏高原东南部强降水的两种类型。这一研究成果于2024年12月25日发表在《科学通报》上。

青藏高原东南部是青藏高原夏季强降水最突出的地区。然而，对该地区夏季强降水的大尺度环流类型和动力机制的研究仍不充分。

利用分层聚类方法，研究人员确定了与强降水相关的两种不同的大气环流模式：青藏高原涡旋型（TPVT，占56.6%）和中纬度槽型（MLTT，占43.4%）。

对两种大气环流型的综合分析表明，夏季强降水的发生与正涡度异常、水汽辐合，以及西风急流核向东南移动之间存在明显的联系。具体来说，TPVT事件的特征是东向和干到湿的位涡发展过程，而MLTT事件与深温带槽进入SETP有关。

该研究促进了我们对SETP夏季强降水复杂机制的理解，揭示了该地区的关键气象过程。

附：英文原文

Title: Two Types of Heavy Precipitation in the Southeastern Tibetan Plateau

Author: Xuelong Chen 

Issue&Volume: 2024/12/25

Abstract: The southeastern Tibetan Plateau (SETP) is the preeminent summer heavy precipitation region within the Tibetan Plateau (TP). However, the large-scale circulation types and dynamics driving summer heavy precipitation in the SETP remain inadequately elucidated. Using the hierarchical clustering method, two distinctive atmospheric circulation patterns associated with heavy precipitation were identified: the Tibetan Plateau vortex type (TPVT, constituting 56.6% of the events) and the mid-latitude trough type (MLTT, 43.4%). A comprehensive examination of the two atmospheric circulation patterns reveals a clear nexus between the occurrences of summer heavy precipitation and positive vorticity anomalies, moisture convergence, as well as the southeastward displacement of the westerly jet core. Specifically, TPVT events are characterized by the eastward and dry-to-wet potential vorticity progression processes, while MLTT events are linked to the intrusion of deeply extratropical trough into the SETP. This study advances our understanding of the complex mechanisms governing the summer heavy precipitation in the SETP, shedding light on critical meteorological processes in the region.

DOI: 10.1016/j.scib.2024.12.031

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927324009381