台风达姆雷的气旋形成与衰减

X. Liang, Lan Wang
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引用次数: 1

摘要

台风的气旋形成一直是动力气象学的一个挑战。本文采用近年来发展起来的多尺度窗口变换方法,结合基于多尺度窗口变换的局域多尺度能量涡度分析和典型转移理论,对高纬度地区罕见热带风暴“达姆雷”的形成、维持和衰减过程进行了研究。首先将大气场重构到三个尺度子空间或尺度窗口上:大尺度窗口、热带气旋尺度窗口和积云对流尺度窗口。在气旋尺度窗口上,达姆雷正好位于副热带高压的边缘。它是由于对流层下层强烈的正压不稳定而产生的,但它随后的快速放大与对流层上层的斜压不稳定有关。Damrey在登陆前开始衰减,位于东海长江口,那里有一个强大的逆级联中心,将气旋尺度的能量向后转移到大尺度窗口。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Cyclogenesis and Decay of Typhoon Damrey
The cyclogenesis of typhoons has been a continuing challenge in dynamic meteorology. In this study, we use a recently developed methodology, namely, multiscale window transform (MWT), together with the MWT-based localized multiscale energy and vorticity analysis and the theory of canonical transfer, to investigate the formation, maintenance, and decay of the typhoon Damrey, a rarely seen tropical storm of higher-latitude origin. The atmospheric fields are first reconstructed onto three scale subspaces or scale windows: large-scale window, tropical cyclone-scale window, and cumulus convection-scale window. On the cyclone-scale window, Damrey is found right along the edge of the subtropical high. It is generated due to a strong barotropic instability in the lower troposphere, but its subsequent rapid amplification is, however, related to a baroclinic instability in the upper troposphere. Damrey begins to decay before landfall, right over East China Sea at the mouth of Yangtze River, where a strong inverse cascade center resides and transfers the cyclone-scale energy backward to the large-scale window.
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