碩士 / 國立臺灣海洋大學 / 海洋環境資訊學系 / 101 / Abstract
The purpose of this thesis is to investigate variations and trends of upwelling in the waters adjacent to Taiwan. The data used in this study is the sea surface temperature (SST) derived from the thermal infrared sensors onboard the satellites of National Oceanic and Atmospheric Administration (NOAA). The span of data is from 1984 to 2009. The study areas are focused on the Pengjia islet and the Taiwan Bank where are the areas adjacent to the northeast and southwest Taiwan, respectively. The upwelling at these two areas is mainly caused by the interaction between ocean current and local topography, which is different from the upwelling by wind driven. To investigate the variations and trends of upwelling intensity, an upwelling index is used which is defined as the difference of SST between the upwelling area and its adjacent coastal area. The results show that the intensities of upwelling are reduced at both areas, but are not significant. For the upwelling area of Pengjia islet, the most and the less intensities of upwelling are in spring and in fall, respectively. The trends of intensity are decreased in spring and in winter, but increased in summer and in fall. For the upwelling area of Taiwan Bank, the most and the less intensities of upwelling are in winter and in fall, respectively. The trend of intensity is only increased in winter. The inter-annual and inter-decadal variations are also found by the Empirical Mode Decomposition method. The magnitude of intensity in the inter-annual timescale is larger than that of inter-decadal timescale.
| Identifer | oai:union.ndltd.org:TW/101NTOU5276019 |
| Date | January 2013 |
| Creators | Jui-Hsien Hsieh, 謝瑞賢 |
| Contributors | Chung-Ru Ho, 何宗儒 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 31 |
Page generated in 0.0016 seconds