Centennial-scale records of total organic carbon in sediment cores from the South Yellow Sea, China  

作　　者：祝青 林佳 洪跃辉 袁丽蓉 刘金钟 徐小明 王江海 

机构地区：[1]Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering/South China Sea Bioresource Exploitation and Utilization Collaborative Innovation Center, School of Marine Sciences, Sun Yat-Sen University [2]Guangzhou Institute of Geochemistry, Chinese Academy of Sciences

出　　处：《Journal of Oceanology and Limnology》2018年第1期128-138,共11页海洋湖沼学报（英文）

基　　金：Supported by the National Basic Research Program of China(973 Program)(No.2012CB956004);the Fundamental Research Funds for the Central Universities(No.16lgjc22)

摘　　要：Global carbon cycling is a significant factor that controls climate change.The centennial-scale variations in total organic carbon(TOC)contents and its sources in marginal sea sediments may reflect the influence of human activities on global climate change.In this study,two fine-grained sediment cores from the Yellow Sea Cold Water Mass of the South Yellow Sea were used to systematically determine TOC contents and stable carbon isotope ratios.These results were combined with previous data of black carbon and (210)~Pb dating from which we reconstructed the centennial-scale initial sequences of TOC,terrigenous TOC(TOC_(ter))and marine autogenous TOC(TOC_(mar))after selecting suitable models to correct the measured TOC(TOC_(cor)).These sequences showed that the TOC_(ter) decreased with time in the both cores while the TOC_(mar) increased,particularly the rapid growth in core H43 since the late 1960s.According to the correlation between the Huanghe(Yellow)River discharge and the TOC_(cor),TOC_(ter),or TOC_(mar),we found that the TOC_(ter) in the two cores mainly derived from the Huanghe River and was transported by it,and that higher Huanghe River discharge could strengthen the decomposition of TOC_(mar).The newly obtained initial TOC sequences provide important insights into the interaction between human activities and natural processes.Global carbon cycling is a significant factor that controls climate change. The centennial-scale variations in total organic carbon （TOC） contents and its sources in marginal sea sediments may reflect the influence of human activities on global climate change. In this study, two fine-grained sediment cores from the Yellow Sea Cold Water Mass of the South Yellow Sea were used to systematically determine TOC contents and stable carbon isotope ratios. These results were combined with previous data of black carbon and 210 Pb dating from which we reconstructed the centennial-scale initial sequences of TOC, terrigenous TOC （TOC ter） and marine autogenous TOC （TOC mar） after selecting suitable models to correct the measured TOC （TOC cor）. These sequences showed that the TOC ter decreased with time in the both cores while the TOC mar increased, particularly the rapid growth in core H43 since the late 1960s. According to the correlation between the Huanghe （Yellow） River discharge and the TOC cor, TOCter, or TOCmar, we found that the TOCter in the two cores mainly derived from the Huanghe River and was transported by it, and that higher Huanghe River discharge could strengthen the decomposition of TOCmar. The newly obtained initial TOC sequences provide important insights into the interaction between human activities and natural processes.

关 键 词：organic carbon Middelburg’s model Yellow Sea 

分 类 号：P[天文地球]