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Special Session 2: Changing ocean environment: from the sedimentary perspective -- processes and records |
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A case study of sedimentary n-alkanes collecting from a small river without flow passing through mountain belt of Taiwan
SS2-10-S
Zih-Hang Tang* , Department of Oceanography, National Sun Yat-sen University
Wu-Shan Chu, Department of Oceanography, National Sun Yat-sen University
Shu-Han Chang, Department of Oceanography, National Sun Yat-sen University
Meng-Ting Chiang, Department of Oceanography, National Sun Yat-sen University
Yuan-Pin Chang, Department of Oceanography, National Sun Yat-sen University
Presenter Email: ur840506@yahoo.com.tw
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| Mountainous rivers play an important role on transporting terrestrial organic carbon into ocean. However, carbon species and aged or not of terrestrial carbon discharging from mountainous rivers which originated from tectonic activated regions are still unclear. According to previous studies done in Gaoping River and Zhuoshui River, the largest two rivers on Taiwan Island, organic carbons in river sediments are dominated by fossil carbon. Even in the Taiwan Strait, aged organic carbons are also predominant. In this study, we hypothesized that aged carbons are mainly contributed from lithic sources, then sediments transporting by a river which not flow through orogenic region of Taiwan Island should compose of non-aged organics. For testing this hypothesis, sediments, suspended particles and soils were collected from the Jishui River, a typical small river with merely 65 km in length and 379 km2 in catchment area, by testing hydrocarbons in this study. Our preliminary result prove the hypothesis that mainly fresh, less degraded n-alkanes are discovered in our collected samples. Therefore, this investigation of carbon species and characteristics output by small rivers without flow through mountain belt may enhance our understanding with carbon cycles between river-sea systems of Taiwan. |
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