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Open AccessArticle

Potential Uncertainties in the Analysis of Low-Wavenumber Asymmetries Caused by Aliasing Center in Tropical Cyclones

College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China
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Atmosphere 2019, 10(6), 300; https://doi.org/10.3390/atmos10060300
Received: 10 March 2019 / Revised: 17 May 2019 / Accepted: 21 May 2019 / Published: 1 June 2019
(This article belongs to the Special Issue Advancements in Mesoscale Weather Analysis and Prediction)
Variations in both symmetric wind components and asymmetric wave amplitudes of a tropical cyclone depend on the location of its center. Because the radial structure of asymmetries is critical to the wave–mean interaction, this study, under idealized conditions, examines the influences of a center location on the radial structure of the diagnosed asymmetries. It has been found that the amplitudes of aliasing asymmetries are mainly affected by the initial symmetric fields. Meanwhile, the radial structure of asymmetry is controlled by the aliasing direction. Sensitivity tests on the location of the center were employed to emphasize the importance of the aliasing direction using angular momentum equations. With a small displacement, the tendencies of azimuthal tangential wind are found to reverse completely when the center shifts to a different direction. This work concludes that the diagnostic results related to asymmetric decomposition should be treated rigorously, as they are prone to inaccuracies, which in turn affect cyclone prediction. View Full-Text
Keywords: tropical cyclone; low–wavenumber asymmetries; aliasing error; wave–mean interaction tropical cyclone; low–wavenumber asymmetries; aliasing error; wave–mean interaction
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Zhao, C.; Song, J.; Leng, H.; Zhao, J. Potential Uncertainties in the Analysis of Low-Wavenumber Asymmetries Caused by Aliasing Center in Tropical Cyclones. Atmosphere 2019, 10, 300.

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