碩士 / 國立臺灣大學 / 大氣科學研究所 / 105 / Typhoon Haiyan (2013) underwent an extreme rapid intensification (RI) process. According to the Joint Typhoon Warning Center (JTWC), one-minute maximum sustained wind speed increased 30 m s^(-1) from 0000 UTC Nov 5 to 0000 UTC Nov 6, which is about 1.5 times the RI threshold, 19.5 m s^(-1) day^(-1), defined by Hendricks et al. (2010). The SSMIS 91 GHz satellite map reveals the process that the convection on the south side of the eye contracted, and the eyewall was established and was axisymmetrized in RI period.
In order to study the RI process of typhoon Haiyan, we apply dynamic efficiency of heat developed by Hack and Schubert (1986) to diagnose. Through this concept, we can examine the effect of heating on the energy conversion rate, converting total potential energy into total kinetic energy.
Hack and Schubert (1986) used idealized vortex structure and ideal diabatic heating to examine the dynamic efficiency. However, in this study, we simulate the RI process of typhoon Haiyan by the Cloud-Resolving Storm Simulator (CReSS) and obtain the high-resolution structure of typhoon Haiyan, which are more realistic than idealized vortex structure, to examine the dynamic efficiency and its structural distribution and its changes over time.
The results indicate that CReSS model can reproduce the intensity change rate, the contraction of the convection on the south side of the eye, and the establishment and axisymmetrization of the eyewall. The dynamic efficiency analysis suggests there is high efficiency in the early stage of RI, and the vortex structure at this time can efficiently convert the latent heat into kinetic energy, which rapidly enhances system intensity.
| Identifer | oai:union.ndltd.org:TW/105NTU05022022 |
| Date | January 2017 |
| Creators | Chien-Chang Huang, 黃建彰 |
| Contributors | Hung-Chi Kuo, 郭鴻基 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 79 |
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