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On the relationship between tropical cyclone size and environmental helicity in the South China Sea

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Li, M., Chu, K., Gu, J.-F. ORCID: https://orcid.org/0000-0002-7752-4553 and Tan, Z.-M. (2022) On the relationship between tropical cyclone size and environmental helicity in the South China Sea. Atmospheric and Oceanic Science Letters, 15 (4). 100205. ISSN 1674-2834

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To link to this item DOI: 10.1016/j.aosl.2022.100205

Abstract/Summary

In this study, the impact of environmental factors on tropical cyclone (TC) outer-core size was investigated for both migrating and local TCs in the South China Sea during the period 2001–2019. Among all the thermodynamic and dynamic factors, the low-level environmental helicity showed the strongest positive correlation with TC outer-core size. Large helicity favors the development and organization of convection in TCs, and the corresponding strong inflow and large angular momentum fluxes into the system is beneficial for the maintenance and enlargement of TC outer-core size. Besides, the asymmetric distribution of helicity may account for the asymmetry of TC outer-core size. Therefore, the environmental helicity, as an integrated dynamic factor, can provide an alternative view on TC outer-core size.

Item Type:Article
Refereed:Yes
Divisions:Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:104155
Publisher:Institute of Atmospheric Physics, Chinese Academy of Science
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