碩士 / 國立臺灣海洋大學 / 海洋環境化學與生態研究所 / 97 / Comprehensive carbon chemistry data including dissolved inorganic carbon (DIC), pH, total alkalinity (TA), and fugacity of CO2 (fCO2) were measured at 25 stations along 4 transects in the entire East China Sea (ECS) shelf in January 2008.
The results show that the variations of DIC, pH, TA, and fCO2 range from 1941 to 2081 �慆ol kg-1, 7.905 to 8.091, 2240 to 2286 �慆ol kg-1, and 297 to 372 �廇tm, respectively. DIC is negatively correlated with temperature, indicating that temperature is the dominant factor regulating DIC variation. The close correlation between pH and DIC suggests that DIC exerts a strong control over the pH variation. TA does not show positive correlation with salinity, probably due to the addition of TA from pore water of sediments. The fCO2 differences between the surface water and the atmosphere (�惠CO2) range from 0 to – 64 �廇tm, evidencing that the entire ECS shelf is a strong sink of CO2 during the winter time with an average flux of -12.7 mmol m-2 day-1.
Comparison between the present result and that of Tsunogai et al. (1999) shows that the capacity of the ECS to uptake atmospheric CO2 in winter has declined. This attenuation may be associated with the summer eutrophication, caused by the increasing nutrients supply from the Changjiang River. Although eutrophication may enhance the capacity of the ECS to absorb atmospheric CO2 in summer via the intensive biological production, the photosynthetically fixed-CO2 is mainly accumulated in the subsurface water that can be returned to the surface in winter through strong vertical mixing, and thus diminishing the capacity of the ECS to uptake atmospheric CO2 in winter.
| Identifer | oai:union.ndltd.org:TW/097NTOU5282035 |
| Date | January 2009 |
| Creators | 張絡萍 |
| Contributors | wen-chen Chou, 周文臣 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 30 |
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