首页|Long-Chain Alkenones in the South Yellow Sea Sediments and Their Indicative Significance for Haptophytes Species
Long-Chain Alkenones in the South Yellow Sea Sediments and Their Indicative Significance for Haptophytes Species
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Long-chain alkenones(LCAs)have been widely used as important biomarkers in palaeoceanographic studies.However,the commonly used LCAs proxies are mainly based on C37 alkenones,and it is still lack of the studies about the distribution and in-dications of LCAs with different chain lengths other than C37 alkenones.Here,the composition and distribution of LCAs were ana-lyzed in surface sediments from the southern Yellow Sea(SYS)and a sedimentary core(A02-C)from the central Yellow Sea(YS)mud area.The results showed that C37,C38 and C39 alkenones were the major LCAs in surface sediments of the SYS,and the relative contents of C38:2Et,C37:2Me,C37:3Me,C38:2Me,C38:3Et,C38:3Me,C39:2Et and C39:3Et were 18.3％-59.8％,22.6％-41.2％,7.4％-23.0％,6.6％-15.4％,3.8％-13.3％,3.6％-8.7％,2.8％-6.0％and 0.7％-3.0％,respectively.Then the relationships of UK38Me-UK38Et and UK'37-UK38Et,indicate that LCAs are mainly derived from Emiliania huxleyi(E.huxleyi).High ratios of total C37 alkenones to total C38 alkenones(K37/K38)(1-1.2)were found in the central SYS,corresponding to the relatively high abundance of E.huxleyi;while low ratios of K37/K38(0.7-0.9)were observed at nearshore area of the SYS where Gephyrocapsa oceanica(G.oceanica)has rela-tively high abundance.The spatial distribution of K37/K38 ratio is also consistent with that of coccolithophores nannofossil in the sediments.In addition,K37/K38 ratio in core A02-C varied from 0.7 to 1.1 with a gradual decreasing trend during the past 5.5 kyr.This suggests that the relative abundance of E.huxleyi decreased gradually,caused by the changes in the Yellow Sea Warm Current(YSWC)and the East Asian Winter Monsoon(EAWM)during this period.
alkenonessouthern Yellow SeasedimentYellow Sea Warm Current
XU Yakun、YANG Xinxin、XIAO Rui、XING Lei
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Key Laboratory of Marine Chemistry Theory and Engineering Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China
Laboratory of Marine Ecology and Environment Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Basic Research Program of China(973 Program)
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