碩士 / 國立臺灣海洋大學 / 海洋環境資訊學系 / 101 / The mesoscale eddies off east coast of Taiwan were studied using Sea Level Anomaly (SLA) derived from satellite altimetry in 1999 to 2010 March and moored temperature measurements in 2009. Okubo-Weiss parameter was used to carry out the identification and track of eddy. Our analysis suggested the possibility of appearance of mesoscale eddies off eastern shoreline of Taiwan is 96%. Warm (anticyclonic) and cold (cyclonic) eddies are prevailing in summer-autumn and in winter-spring, respectively. Combining all the tracks of eddy, it is convincing that those eddy observed off east coast of Taiwan originated from the region within 124°E~135°E. After they were generated, these eddies propagated primarily westward, with slight poleward and equatorward deflection for cyclonic and anticyclonic eddies, respectively. The mean eddy propagation speed is ~0.12 m/s, and the maximum speed is about 0.17 m/s. The eddy-induced surface displacement is 25~35 cm. The mean spatial scale of eddy is 300~350 km. In general, warm eddies have larger spatial scale and surface displacement than their counterparts. The poor correlation between eddy-induced Sea Surface Temperature (SST) variability and SLA reflect that the eddy is hard to be observed by SST in this area. However, the high correlation (0.9) of SLA with both upper ocean heat content and dynamic height ,computed using moored temperature measurements, indicated eddies play an extremely important role to constitute the upper ocean thermal structure.
| Identifer | oai:union.ndltd.org:TW/101NTOU5276010 |
| Date | January 2013 |
| Creators | Yu-Chen Lien, 練育貞 |
| Contributors | Ming-Huei Chang, 張明輝 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 51 |
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