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The Use of a Spectral Nudging Technique to Determine the Impact of Environmental Factors on the Track of Typhoon Megi (2010)

Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
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Atmosphere 2017, 8(12), 257; https://doi.org/10.3390/atmos8120257
Received: 3 October 2017 / Revised: 7 December 2017 / Accepted: 7 December 2017 / Published: 20 December 2017
(This article belongs to the Special Issue Tropical Cyclones and Their Impacts)
Sensitivity tests based on a spectral nudging (SN) technique are conducted to analyze the effect of large-scale environmental factors on the movement of typhoon Megi (2010). The error of simulated typhoon track is effectively reduced using SN and the impact of dynamical factors is more significant than that of thermal factors. During the initial integration and deflection period of Megi (2010), the local steering flow of the whole and lower troposphere is corrected by a direct large-scale wind adjustment, which improves track simulation. However, environmental field nudging may weaken the impacts of terrain and typhoon system development in the landfall period, resulting in large simulated track errors. Comparison of the steering flow and inner structure of the typhoon reveals that the large-scale circulation influences the speed and direction of typhoon motion by: (1) adjusting the local steering flow and (2) modifying the environmental vertical wind shear to change the location and symmetry of the inner severe convection. View Full-Text
Keywords: spectral nudging; typhoon track; environmental factors spectral nudging; typhoon track; environmental factors
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Guo, X.; Zhong, W. The Use of a Spectral Nudging Technique to Determine the Impact of Environmental Factors on the Track of Typhoon Megi (2010). Atmosphere 2017, 8, 257.

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