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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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Abundance and burial flux of soot black carbon in sediments on the northern South China Sea Shelf
P-G1-11-S
Junfei Zhou* , 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
Ziming Fang, College of Ocean and Earth Sciences, Xiamen University
Fang Zhang, College of Ocean and Earth Sciences, Xiamen University
Xiao Zhang, College of Ocean and Earth Sciences, Xiamen University
Yusheng Qiu, College of Ocean and Earth Sciences, Xiamen University
Presenter Email: 22320171150797@stu.xmu.edu.cn |
| Black carbon (BC) represents one of the most refractory carbon pools in the ocean. Here, the abundance and burial flux of soot black carbon (soot-BC) were examined in five sediment cores collected on the northern South China Sea Shelf. From coast to offshore stations, soot-BC contents averaged 0.035% (mg-BC per mg-dry sediment), 0.050%, 0.041%, 0.016% and 0.027% at five stations respectively. Spatially, stations close to slope showed lower BC values than nearshore stations. Soot-BC accounted for 2.5% to 18.2% of the total organic carbon with the lowest values in offshore stations, indicating a weakened influence of soot-BC on carbon pool in slope and basin regions. Combining the sedimentation rates constrained by 210Pb-chronology, the burial fluxes of soot-BC were estimated to average 0.062 mg cm-2 yr-1, 0.111 mg cm-2 yr-1, 0.042 mg cm-2 yr-1, 0.014 mg cm-2 yr-1 and 0.015 mg cm-2 yr-1 from nearshore to offshore stations. Prior to 1950s, soot-BC burial fluxes showed a little variability. From 1950s to 1980s, a slowly increase was observed at three nearshore stations. After 1980s, soot-BC burial had an evident elevation. However, such trends were not obvious at offshore stations. These results indicated that anthropogenic activities play an important role in affecting the abundance and burial flux of soot-BC in the northern South China Sea Shelf regions. Re-construction of the temporal variability in soot-BC would provide insights into the influence of human on the environmental changes in the South China Sea.
Acknowledgments This work was supported by the NSFC(41476061).
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