碩士 / 國立臺灣大學 / 海洋研究所 / 103 / The purpose of this study is to quantify the sources and routes of deep water mass east of Taiwan. A hydrographic data set, which ranges from 118°E to 150°E and from 4°N to 40°N with maximum depth 2000 m is obtained from Argo and CTD data over the past 20 years. This study adopts root mean square method to investigate the similarity of water masses east of Taiwan. The potential vorticity, water layer thickness and baroclinic geostrophic velocity calculating are also used to trace the deep water route in the Philippine Sea Basin. Finally, this study applies the water mass components analysis with North Pacific Intermediate Water and Circumpolar Deep Water, these two different water masses characters in the CTD datasets east of Taiwan to determine the water mass composition.
The deep water east of Taiwan is defined as "Layer 1 Deep Water" and "Layer 2 Deep Water". The former has a density range from 1027.4 kg m-3 to 1027.5 kg m-3, salinity range from 34.487 to 34.551 and temperature range from 3.764℃ to 2.701℃. The latter has a density range from 1027.6 kg m-3 to 1027.65 kg m-3, salinity range from 34.578 to 34.610 and temperature range from 2.349℃ to 2.040℃. The results of root mean square analysis show the water with similar salinity is zonally distributed in Layer 1 and is in northern half of Philippine Basin in Layer 2. Results from potential vorticity, water layer thickness and baroclinic geostrophic velocity indicate that the deep water east of Taiwan in Layer 1 most likely comes from the Pacific through the Philippine Sea till the Ryukyu Island Arc at 24°N. When the water impinges to the Ryukyu Island Arc, it is separated as two flows toward the north and the south. The southward-moving water goes into the Huatung Basin forming a cyclonic circulation and then leave the Huatung Basin to east of Luzon Island. The deep water east of Taiwan in Layer 2 shows a similar flow pattern as that in Layer 1. The deep water east of Taiwan in Layer 1 consists of Circumpolar Deep Water and North Pacific Intermediate Water but with more Circumpolar Deep Water than North Pacific Intermediate Water in Layer 2.
| Identifer | oai:union.ndltd.org:TW/103NTU05279012 |
| Date | January 2015 |
| Creators | Hung-Wei Chou, 周宏瑋 |
| Contributors | Sen Jan, 詹森 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 89 |
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