This study use the hydrography and current data measured along a zonal transect across the Penghu Channel (PHC) during 1985-2003 to calculate through-flow, temperature and salt transports (Q, TT and ST), and analyze hydrographic transects and water masses variations through the PHC. The influence of the El Niño on the variations of temperature and salinity in the PHC is also investigated. The calculated Q is about 0 Sv (1 Sv = 106 m3/s) in winter, and the TT, ST, heat flux are amount to -0.005¡Ñ1015 W, -2¡Ñ106 kg/s, -1.6¡Ñ106 W/m2; during winter-spring period, the Q increases from 0.5 to 1 Sv as the northeast monsoon weakens, and the TT, ST, heat flux are amount to 0.052~0.113¡Ñ1015 W, 20~40¡Ñ106 kg/s, 16~35¡Ñ106 W/m2, respectively. The Q peaks to 1.5 Sv at the end of southwest monsoon in summer, and the TT, ST, heat flux are 0.162¡Ñ1015 W, 52¡Ñ106 kg/s, 53¡Ñ106 W/m2, respectively. The Q decreases rapidly from 1.5 to 0 Sv when the northeast monsoon intensifies in autumn, and the TT, ST, heat flux are 0.162~-0.005¡Ñ1015 W, 52~ -2¡Ñ106 kg/s and 53~ -1.6¡Ñ106 W/m2, respectively. The relationship between the through-flow transport and the wind stress is expressed as Q (Sv) = 1.37+5.58¡Ñwind stresses (N/m2). The correlation coefficient is 0.97. The water column is strongly stratified in summer and nearly well-mixed in the upper 100 m in winter. The major water masses are the colder and saline Kuroshio Branch Water and the warmer and less saline South China Sea Surface Water respectively in winter and summer. The correlation coefficients for the El Nino index, the Southern Oscillation Index, to the anomalies of depth averaged (< 50 m) temperature and salinity are 0.527 and -0.429, respectively, suggesting that temperature and salinity might be anomalous decrease and increase during the El Niño.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0730104-180636 |
| Date | 30 July 2004 |
| Creators | Chen, Chung-Kuang |
| Contributors | Sen Jan, Chau-Ron Wu, Y.-J. Yang, David D. Sheu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730104-180636 |
| Rights | unrestricted, Copyright information available at source archive |
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