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Distribution of Dissolved Organic Carbon in the Continental Margin off Northern Taiwan
臺灣北部邊緣海域溶解性有機碳之分佈
並列摘要
Analytical precision of dissolved organic carbon (DOC) in seawater using the high-temperature catalytic method (HTCO) and distributions of DOC in the continental margin off northern Taiwan were investigated. The DOC concentration of Kuroshio water off northeastern Taiwan varied from 122-136μM C at the surface to 65-74μM C at the bottom. The concentration decreased sharply downward in the upper 200m of the water column and then decreased slightly toward the bottom. The pattern showed neither seasonal variation nor a significant difference from that observed in the water off southeastern Taiwan. The concentration of DOC was found to be inversely correlated with apparent oxygen utilization (AOU) in the Kuroshio water. The slope, however, was smaller than that predicted from the Redfield stoichiometry, indicating that only a small fraction (＜25%) of AOU was derived from the oxidation of DOC. Distributions of DOC were found to vary, both temporally and spatially in the continental shelf and slope waters. Although the distributions were relatively patchy in the inner and middle shelves, they were influenced apparently by the upwelled Kuroshio subsurface water in the outer shelf and slope regions. DOC may have been diluted in the intensive upwelling regime but enhanced on the margin of the up- welling center. Terrestrial DOC was largely confined to areas close to the continent. DOC was higher in near bottom waters, indicating that it diffused from sediments and/or was released from resuspended sediments. Thus, DOC varied non-conservatively across the continental margin through various blogeochemical processes. The horizontal gradient of surface DOC decreasing from the southern East China Sea (ECS) to the N. Pacific may reflect a similar trend of surface biological productivity and suggest the potential export of DOC out of the ECS continental margin as well.
延伸閱讀
- Hung, T. C., Li, T. R., & Hsyng, L. (1976). 臺灣西岸海底沉積物中總有機碳之研究. 中央研究院化學研究所集刊, (23), 1-8. https://doi.org/10.6522/BICAS.1976.23.1
- Hung, T. S. C., Lin, S. H., Chuang, A., & sai, C. C. H. T. (1981). 臺灣北部海域溶解性有機碳、有效氧利用值與營養鹽之研究. 中央研究院化學研究所集刊, (28), 11-26. https://doi.org/10.6522/BICAS.1981.28.2
- 胡庭恩（2006）。台灣北部地區主要人工林土壤碳貯存量之估算〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2006.00478
- 蔡閔曲（2004）。台灣西南海域顆粒有機碳垂直輸出通量之研究〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2004.01916
- 許鳳心（2008）。台灣西南海域陸源有機碳沉降受鄰近島嶼型河川顆粒傳輸影響之研究〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2008.00102