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Distributions and origins of lipid biomarkers in surface sediments from the southern Yellow Sea |
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| Authors: | Lei Xing Shuqin Tao Hailong Zhang Yanguang LiuZhigang Yu Meixun Zhao |
| Institution: | a Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China b Institute of Marine Organic Geochemistry, Ocean University of China, Qingdao 266100, China c Key Laboratory of Marine Sedimentology and Environmental Geology, State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China |
| Abstract: | This paper reports on the spatial distribution patterns and investigates the controlling mechanisms of phytoplankton biomarkers (brassicasterol for diatoms, alkenones for haptophytes, dinosterol for dinoflagellates) and terrestrial biomarkers (odd C number long-chain (C27 + C29 + C31) n-alkanes) in surface sediments from the southern Yellow Sea (SYS). The contents of the phytoplankton biomarkers in the SYS surface sediments reveals a clear spatial pattern, with low values near the coasts and increased values seaward, caused by higher phytoplankton primary productivity and low sedimentation rates in the basin. The contents of terrestrial biomarkers show high values in the northern part of the study areas off the Shandong Peninsula and Jiangsu coast, caused by inputs of materials from the modern Huanghe River and the old Huanghe delta, respectively. The results also indicate that biomarker ratios offer the best approach for reconstructing marginal sea C cycles, as these proxies can be used to estimate the contributions of both terrestrial and marine organic matter and to reconstruct paleoproductivity and paleoecological changes in the SYS. |
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