碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 101 / Abstract
In this study, we collected Taiwanese LL fishery data and environmental variables in Indian Ocean during 2006–2008. We aim to investigate the relationship between LL catch data of YFT and oceanic environmental factors. The results were summarized as below:
The AMSR-E surface temperature and JSD frontal zone of waters environment in Indian Ocean change not only within years, but also with in seasons. In terms of
AMSR-E surface temperature, 4th Quarter, the 28 ℃ isotherm moves about 5 degrees
eastward from south latitude, turning to northeast from 60 degrees east longitude to near Mumbai India. First Quarter , warming phenomenon is more obvious. The waters in Indian Ocean equator area, where is between 10 degrees north and south latitude, turn out to be with temperature higher than 30 ℃, accompanying a northward drift. Second Quarter, with strong southwest monsoon prevails, the Somalia's coastal upwelling zone (<25 ℃) area expands, and extends along the western Arabian Sea to the north. At this point, the warm waters of 28 ℃ drift to the Western Indian Ocean and warm water (>30 ℃) has disappeared. When the southwest monsoon begin to weaken after autumn, warm waters of 28 ℃gradually shifted back to the Western Indian Ocean waters, covering latitude 10 degrees north of the western Indian Ocean waters. The JSD frontal zone of AMSR-E surface temperature is broadly distributed in Somalia to the northeast coastal waters extending to India, as well as 5 degrees south latitude eastward. And in east longitude between 60-65 degrees, it turns to the northeast and other two frontal areas, which fluctuate with the seasons.
By applying SST and Jensen-Shannon divergence (JSD) and analyzing the observation data, we found that the high CPUE area (C4 CPUE >1.8 fish/103 hooks)occurred in the Arabian Sea and Western Central Indian Ocean, which varies mainly with the seasons of SST and JSD. 82% of high CPUEs occurs in surface temperature with 27–30.5°C, and 87% were in the 0.3–0.9 JSD range, furthermore, more than 86% of high CPUEs are located in the waters with high JPD (Joint probability density; JPD > 50%). The results proved that the high JPD area is mainly distributed in the western Indian Ocean and Bangladesh Bay waters in the first quarter. The second quarter high JPD appeared in the Arabian Sea. However, due to a wide range of coastal upwelling effect, high value JPD is mainly distributed in the farther offshore waters of the western Indian Ocean in the third quarter.
| Identifer | oai:union.ndltd.org:TW/101NTOU5451043 |
| Date | January 2013 |
| Creators | Yan-Song Zhan, 詹燕松 |
| Contributors | Ming-An Lee, 李明安 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 74 |
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