碩士 / 國立中山大學 / 海洋地質及化學研究所 / 101 / This study is a part of the ongoing integrated research, “Oceanography of tropical marginal seas: The Northern South China Sea”. Comprehensive carbon chemistry parameters, including pH, dissolved inorganic carbon (DIC), total alkalinity (TA), and fugacity of CO2 (fCO2) were measured for water samples collected from the north South China Sea in November, 2011 (winter) and September, 2012 (summer). The main purposes of this project are to investigate the air-sea exchange of CO2 and the related controlling mechanism. Furthermore, the role of carbon dynamics in this margin was examined.
Results show that temperature, salinity, pH and TA all have the minimum around the inner shelf except for DIC due to the freshwater input form the Pearl River in winter. Both of DIC and TA have significant correlation with salinity owing to mixing freshwater with seawater in mixed layer. Meanwhile, the change in pH is mainly controlled by DIC concentration. The study area acts as a sink of atmospheric CO2 with a mean CO2 flux of -3.63 mmol m-2 day-1 in winter. High nutrient inputs enhanced biological effects from the Pearl River, resulting the minimal DIC and TA concentration of mixed layer in the inner shelf during summer. In general, this study area is a weak source of atmospheric CO2 with a mean CO2 flux of -2.12 mmol m-2 day-1 in summer.
The South China Sea does not appear to have accumulation of remineralized CO2 in bottom waters at the inner shelf in summer. Even though winter have strong vertical mixing, the fCO2 range is similar to summer at the inner shelf. At the outer shelf, the seasonal change is probably resulted from the strong vertical mixing, which brings nutrient-rich subsurface water to the surface and fuels the biological productivity, leading to the observed higher summer fCO2.
| Identifer | oai:union.ndltd.org:TW/101NSYS5271005 |
| Date | January 2013 |
| Creators | Hsiu-Chen Yeh, 葉秀貞 |
| Contributors | David Der-Duen Sheu, 許德惇 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 97 |
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