碩士 / 國立中央大學 / 大氣物理研究所 / 97 / The process of cloud clusters developing into tropical depressions is an important subject which scientists are interested. In this study, we analyzed the environmental field variations related to the cloud clusters which were developing into tropical depressions over the South China Sea. We employed SSM/I and QuikSCAT satellite data to estimate the total heat energy and sea surface vorticity ,and then establish the objective heat index and the objective dynamic index, respectively. We analyzed the variations of the objective heat index and the objective dynamic index of those tropical depressions, and tried to find the main mechanism as whether the tropical depressions will occur or not.
The result shows that the process of cloud clusters developing into tropical depressions over the South China Sea. The key factor of whether a tropical depression will occur or not is that its objective heat index and the objective dynamic index both are higher than the thresholds. This result can allows the warning time is shifted to be one to two days earlier before the official JTWC warning is announced. In other words, this research provide an objective method for earlier predicting whether a tropical depression will occur or not .
| Identifer | oai:union.ndltd.org:TW/097NCU05021020 |
| Date | January 2009 |
| Creators | Yung-Yu Lai, 賴勇瑜 |
| Contributors | Gin-Rong Liu, 劉振榮 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 96 |
Page generated in 0.0394 seconds