An ERA5 global climatology of tropical cyclone size asymmetry,International Journal of Climatology

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An ERA5 global climatology of tropical cyclone size asymmetry
International Journal of Climatology ( IF 3.5 ) Pub Date : 2022-08-30 , DOI: 10.1002/joc.7846
Kailin Zhang ₁ , Kelvin T. F. Chan _{1,

2,

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Affiliation

The size of tropical cyclone (TC), defined as the radius of gale-force (34-kt) 10-m winds (R34) from a TC centre, is often asymmetric but received limited attention. Understanding the asymmetry of TC size is particularly essential to enhance the applicability, predictability, and preparedness for the parties in the coastal regions. In this study, the ERA5 reanalysis data are first validated by the QuikSCAT satellite data. Results demonstrate that the radius of ERA5 32-kt 10-m winds estimates best R34 in the QuikSCAT satellite data with a promising linear relationship (r = .75). A 41-year (1979–2019) homogeneous ERA5 global climatology of TC size asymmetry is hence established based on this linear regression model. Both the temporal and spatial characteristics of the TC size asymmetry are investigated and discussed. This study lays the important groundwork for future sophisticated research on TC size.

中文翻译：

热带气旋大小不对称的 ERA5 全球气候学

热带气旋 (TC) 的大小定义为来自 TC 中心的烈风 (34 节) 10 米风 (R34) 的半径，通常是不对称的，但受到的关注有限。了解 TC 规模的不对称性对于增强沿海地区各方的适用性、可预测性和准备尤为重要。在本研究中，ERA5 再分析数据首先通过 QuikSCAT 卫星数据进行验证。结果表明，ERA5 32-kt 10-m 风的半径估计 QuikSCAT 卫星数据中的最佳 R34 具有良好的线性关系（r =.75）。因此，基于该线性回归模型建立了 41 年（1979-2019）TC 大小不对称的均质 ERA5 全球气候学。研究和讨论了 TC 大小不对称的时间和空间特征。这项研究为未来对 TC 大小的复杂研究奠定了重要基础。

更新日期：2022-08-30

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