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An observational analysis of tropical cyclogenesis in the Western North Pacific

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Title:An observational analysis of tropical cyclogenesis in the Western North
Authors:Fu, Bing
Contributors:Li, Tim (advisor)
Meteorology (department)
Date Issued:Dec 2003
Publisher:University of Hawaii at Manoa
Abstract:High-resolution satellite data are used to analyze 34 tropical storms in the Western North Pacific (WNP) during the 2000 and 2001 storm seasons. Three scenarios: Tropical Cyclone Energy Dispersion (TCED), Synoptic Wavetrain/Mixed Rossby-Gravity wave (SWT/MRG) and Easterly Wave (EW) forcing, are identified as dominant synoptic-scale triggers for TC genesis. Among these 34 cases, 6 cases are associated with TCED, 11 cases are associated with SWTIMRG and 7 cases are associated with EW forcing. For the remaining cases, three presumable scenarios are proposed. Our analyses suggest that TCED has a close relationship with TC intensity and the background wind field. Not all mature TCs produce Rossby wavetrains at their wakes; and not all wavetrains lead to the formation of new TCs. The vertical divergence profile of the Rossby wavetrain has a baroclinic structure, while the vorticity profile shows an equivalent barotropic structure, penetrating from the surface to 200mb. The large-scale environmental flow plays an important role in determining whether a wavetrain can further develop into a TC. Evolution characteristics and vertical structures of easterly waves and synoptic-scale wavetrains and their roles in cyclogenesis are also investigated. Our results also show that tropical Intraseasonal Oscillation (ISO) has a significant modulation on TC formation, especially in 2000.
Description:xii, 84 leaves
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Meteorology

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