On the vertical extending of the explosive extratropical cyclone: A case study,Atmospheric Science Letters

当前位置： X-MOL 学术 › Atmos. Sci. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

On the vertical extending of the explosive extratropical cyclone: A case study
Atmospheric Science Letters ( IF 2.0 ) Pub Date : 2021-01-29 , DOI: 10.1002/asl.1028
Li‐Zhi Jiang _{1,

2} , Hai‐Guo Yu ₃ , Li Dong ₄ , Shen‐Ming Fu ₅ , Jian‐Hua Sun ₁ , Fei Zheng ₅ , Kan Yi ₆ , Hui Ma ₇

Affiliation

Explosive extratropical cyclone (EEC) is the main disastrous weather system over the ocean and offshore areas in the cold season. As a type of vertically deep system, after decades of studies, key features of EECs' vertical extents still remain vague. Based on a reasonably simulated entire‐troposphere‐thick EEC, this study analyzes variation of the EEC's vertical extent and investigates governing mechanisms for its vertical extending. Main findings are as follows: (a) the EEC's vertical extent showed consistent variation features with its central sea level pressure and lower‐level vorticity (correlation coefficients were ~0.9), whereas its relationship with EEC's maximum surface wind was not significant; (b) EEC's upward extending featured strong ascending motion and rapid cyclonic‐vorticity enhancement at the top level of the cyclone and obvious inflow (convergence) in the lower troposphere. (c) vorticity budget at the EEC's top level shows that net import transport of cyclonic vorticity (by westerly and northwesterly winds) from the trough west of the cyclone dominated its upward extending, and upward transport of cyclonic vorticity from levels below the cyclone's top level acted as the second dominant factor. In contrast, divergence‐related vertical shrinking around the EEC's top level was the most detrimental factor for the cyclone's upward extending.

中文翻译：

关于爆炸性温带气旋的垂直延伸：一个案例研究

爆发性温带气旋（EEC）是寒冷季节海洋和近海地区的主要灾难性天气系统。作为一种垂直的深层系统，经过数十年的研究，EEC的垂直范围的关键特征仍然不明确。基于合理模拟的全对流层厚EEC，本研究分析了EEC垂直范围的变化，并研究了其垂直扩展的控制机制。主要发现如下：（a）EEC的垂直范围显示出与其中心海平面压力和较低水平涡度一致的变化特征（相关系数约为0.9），而与EEC的最大表面风的关系不显着；（b）欧洲经济共同体 s的向上延伸表现为强的上升运动和旋风顶部的快速旋风涡增强，而对流层低层则有明显的流入（收敛）。（c）欧洲经济共同体最高层的旋涡预算表明，从旋风西侧的槽中（通过西风和西北风）的净进口旋风占主导地位，其向上延伸，而旋风涡度从旋风顶层以下的水平向上运输成为第二主要因素。相反，围绕EEC最高水平的与发散有关的垂直收缩是旋风向上扩展的最不利因素。s的最高水平表明，从旋风以西的低谷（通过西风和西北风）的净进口旋风占主导地位，而从旋风最高水平以下的水平向上的旋风旋涡向上运输是第二主要因素。相反，围绕EEC最高水平的与发散有关的垂直收缩是旋风向上扩展的最有害因素。s的最高水平表明，从旋风以西的低谷（通过西风和西北风）的净进口旋风占主导地位，而从旋风最高水平以下的水平向上的旋风旋涡向上运输是第二主要因素。相反，围绕EEC最高水平的与发散有关的垂直收缩是旋风向上扩展的最不利因素。

更新日期：2021-01-29

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11