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.
Highlights
On 2 August 2012, a typhoon called Damrey hit Jiangsu the most densely-populated province in China, and caused a heavy damage to the region and its surrounding provinces, such as Fujian, Zhejiang, and Shandong
We look at the dynamical processes underlying Damrey using the multiscale energy and vorticity analysis (MS-EVA) methodology
The higher latitude genesis of Damrey made it a rare tropical cyclone that directly landed on Jiangsu Province
Summary
On 2 August 2012, a typhoon called Damrey hit Jiangsu the most densely-populated province in China, and caused a heavy damage to the region and its surrounding provinces, such as Fujian, Zhejiang, and Shandong. Saola formed over the ocean east of the Philippines, while Damrey formed in higher latitudes Damrey turned northward, decayed rapidly, and disappeared This important and interesting synoptic scale phenomenon, has not been well studied. We use a newly-developed methodology, namely the multiscale energy and vorticity analysis (MS-EVA), to investigate Damrey’s cyclogenesis. Our objective is to gain some insight into typhoons that originate at higher latitudes. In this sense, Damrey may not be representative because it is one of a twin pair. The following section is a brief introduction of MS-EVA, the new methodology We first apply it to reconstruct the two cyclones (Section 3.1), analyze the underlying dynamical processes using the MS-EVA-based instability analysis (Section 3.2).
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