https://scholars.lib.ntu.edu.tw/handle/123456789/385660
標題: | Accumulation of terrestrial organic carbon on an active continental margin offshore southwestern Taiwan: Source-to-sink pathways of river-borne organic particles | 作者: | Hsu, F.-H. CHIH-CHIEH SU Wang, C.-H. Lin, S. Liu, J. Huh, C.-A. |
關鍵字: | Gaoping submarine canyon; Small mountainous river; Terrestrial organic carbon | 公開日期: | 2014 | 卷: | 91 | 起(迄)頁: | 163-173 | 來源出版物: | Journal of Asian Earth Sciences | 摘要: | Sediment samples (213 sites) collected from the tectonic-active continental margin, offshore southwestern Taiwan were analyzed for grain sizes, organic carbon, nitrogen and carbon isotopic composition to obtain mass accumulation rate of terrestrial organic carbon and carbon budget to evaluate fate of terrestrial organic carbon from small mountainous rivers on the continental margin offshore southwestern Taiwan. Terrestrial organic carbon accumulation rates range from 0.29 to 45.6gCm-2yr-1 with a total accumulation budget of 0.063Mtyr-1, which accounts for less than 13% of total river particulate organic carbon loads exported from the adjacent rivers, the Gaoping (a.k.a., Kaoping), Erhjen and Tsengwen rivers. This low burial efficiency of terrestrial organic carbon demonstrated that a majority of river-borne particles together with organic materials was moved away from the study area. For the river-borne particles from the Gaoping river, a pair of depocenters in the upper slope flanking the Gaoping submarine canyon are the locations where the maximum TCorg accumulation rate were observed which hold up to 45% (0.016Mtyr-1) of the calculated accumulation found in the study region. On the other hand, the occurrence of higher-fraction terrestrial organic carbon in the upper and middle Gaoping submarine canyon suggests that a majority of particulate organic carbon of the Gaoping river was transported directly into the deep-sea basin through the Gaoping submarine canyon. Our results demonstrated that active margin with narrow shelf and slope is not an efficient sink for the large amount of terrigenous organic carbon supplied by the small rivers, but, a transient environment for these river derived particles. © 2014 Elsevier Ltd. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84902332760&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/385660 |
DOI: | 10.1016/j.jseaes.2014.05.006 | SDG/關鍵字: | accumulation rate; active margin; carbon sink; continental margin; isotopic composition; organic carbon; particulate organic carbon; source-sink dynamics; submarine canyon; terrestrial environment; Erhjen River; Kaoping River; Taiwan; Tsengwen River |
顯示於: | 海洋研究所 |
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