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Atmosphere 2017, 8(7), 118; doi:10.3390/atmos8070118

A Diagnosis of Some Dynamical Processes Underlying a Higher-Latitude Typhoon Using the Multiscale Window Transform

1
and
1,2,*
1
School of Atmospheric Sciences, Nanjing University of Information Science and Technology, 219 Ningliu Blvd, Nanjing 210044, China
2
School of Marine Sciences, Nanjing University of Information Science and Technology, 219 Ningliu Blvd, Nanjing 210044, China
*
Author to whom correspondence should be addressed.
Received: 1 May 2017 / Revised: 29 June 2017 / Accepted: 30 June 2017 / Published: 3 July 2017
(This article belongs to the Section Climatology and Meteorology)
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Abstract

The typhoon Damrey that hit Jiangsu the populous coastal province of China on 2 August 2012 is a rarely seen tropical cyclone in that it has a higher latitude origin, and it is part of a twin typhoon. In this study, a recently developed analysis tool—multiscale window transform (MWT) and the MWT-based localized multiscale energy and vorticity analysis (MS-EVA)—is applied to investigate its genesis and maintenance. The fields are reconstructed onto three scale windows: large-scale, tropical cyclone–scale, and cumulus convection–scale windows. It is found that the track of Damrey is well along the edge of the subtropical high. Its birth is mainly caused by a strong barotropic instability in the lower troposphere around 24°–25° N. Its later amplification, however, is quite different, related to a baroclinic instability in the upper troposphere. Also discovered in this study is that a strong center of upscale canonical transfer exists over the East China Sea at the mouth of Yangtze River, which accounts for the rapid decay of Damrey before landing. View Full-Text
Keywords: typhoon Damrey; twin typhoon; multiscale window transform; multiscale energetics; barotropic instability; baroclinic instability typhoon Damrey; twin typhoon; multiscale window transform; multiscale energetics; barotropic instability; baroclinic instability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, L.; Liang, X.S. A Diagnosis of Some Dynamical Processes Underlying a Higher-Latitude Typhoon Using the Multiscale Window Transform. Atmosphere 2017, 8, 118.

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