碩士 / 國立臺灣海洋大學 / 海洋環境資訊系 / 102 / Sea surface temperature (SST) variability affects marine ecosystems, fisheries, ocean primary productivity, and human activities, as well as typhoon intensity. SST drops of a few degrees in the open ocean after a typhoon passes have been widely studied, however, few studies have focused on coastal SST variability. The purpose of this study was to understand typhoon-induced SST drops in the coastal ocean. The results of this study were based on field data analysis. SST drop phenomena were observed at Longdong in Northeastern Taiwan during 34 typhoons from 1998~2013. The mean SST drop after typhoon passage was 6.1 ℃ and the maximum drop was 12.5 ℃, and this maximum drop was larger than those observed in the open ocean. It was found that coastal SST drops at Longdong were correlated with typhoon moving track. When a typhoon passes south of Longdong, the strong and continual blowing of alongshore winds induces coastal upwelling and pumps cold water to the surface. In addition, surface wave mixing and the movement of the cold dome that originates offshore of Northeastern Taiwan are minor causes of coastal SST drops. The general contribution of wave mixing was 2~5 ℃ and that of cold dome intrusion was < 3 ℃. When coastal upwelling, surface wave mixing, and cold dome act simultaneously, the joint effects may lead to huge coastal SST drops, such as those observed during Fungwong in 2008 (∆SST = 12.5 ℃), Morakot in 2009 (∆SST =12.3 ℃), and Fanapi in 2010 (∆SST = 10.4 ℃).
| Identifer | oai:union.ndltd.org:TW/102NTOU5276013 |
| Date | January 2014 |
| Creators | Peng, Jen-Ping, 彭仁平 |
| Contributors | Doong, Dong-Jiing, 董東璟 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 80 |
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