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Sediment Dynamics and Morphodynamics of River-Sea Sediment Dispersal Systems through Space and Time: A Source-to-Sink Perspective
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Using 210Pb to constrain sediment focusing in Taiwan Strait
P-G1-09-S
Xiao Zhang* , State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences, Xiamen University
Fang Zhang, State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences, Xiamen University
Weifeng Yang, State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences, Xiamen University
Min Chen, College of Ocean and Earth Sciences, Xiamen University
Yusheng Qiu, College of Ocean and Earth Sciences, Xiamen University
Presenter Email: xiaozhang@stu.xmu.edu.cn |
| 210Pb has been proposed to be an effective tracer of constraining sediment redistribution in shelf regions. Here, the inventories of 210Pb in sediment cores were examined to test its application to identify sediment focusing in western Taiwan Strait. The focusing factor varied from 0.07 to 2.11, indicating sediment focusing at some stations. Spatially, stations with focusing were located in the sedimentary areas identified by other methods, validating the application of 210Pb to constrain sediment focusing in Taiwan Strait. A preliminary budget suggested that the focusing flux of 210Pb ranged from 0.42 Bq m-2 yr-1 to 2.13 Bq m-2 yr-1 with an average of 0.97 Bq m-2 yr-1, accounting for 31% of the burial flux of 210Pb in focusing areas on average. In addition to river runoff and interior focusing in Taiwan Strait, boundary scavenging (BS) via Kuroshio branch is also an important 210Pb source given the focused 210Pb, which contributes about 14% of the total 210Pb input into Taiwan Strait. Thus, Taiwan Strait is a site for intercepting BS-derived 210Pb. |
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