A. O. Badejo1 , B.-H. Choi1 , H.-G. Cho2 , H.-I. Yi3 , and K.-H. Shin1
A. O. Badejo et al.
A. O. Badejo1 , B.-H. Choi1 , H.-G. Cho2 , H.-I. Yi3 , and K.-H. Shin1
1 Department of Environmental Marine Sciences, Hanyang University, Ansan, 426-791, Korea 2 Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University, Jinju, 660-701, Korea 3 Marine Geoenvironmental Research Divisions, Korea Institute of Ocean Science and Technology (KIOST), Ansan, 425-170, Korea
1 Department of Environmental Marine Sciences, Hanyang University, Ansan, 426-791, Korea 2 Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University, Jinju, 660-701, Korea 3 Marine Geoenvironmental Research Divisions, Korea Institute of Ocean Science and Technology (KIOST), Ansan, 425-170, Korea
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Received: 06 Mar 2014 – Discussion started: 09 Apr 2014
This study is the first reconstruction of the paleoenvironment and paleovegetation during the Holocene (interglacial) and glacial periods of the Yellow Sea. We report the carbon isotopic and biomarker (n -alkane and alkenone) compositions of organic matter from Yellow Sea sediments since the glacial period. Our findings show that the variability of the East Asian Monsoon (EAM) affected the sedimentary profile of total organic carbon (TOC), the stable isotopes of bulk organic carbon (δ13 Corg ), the atomic ratio of carbon and nitrogen (C/N ratio), and biomarker content. The sedimentary δ13 Corg profile along the core exhibited more negative δ13 Corg values under cold/dry climatic conditions (Younger and Oldest Dryas). The carbon preference index (CPI), the pristane to phytane ratio (Pr/Ph) and the pristane to n -C17 ratio (Pr/n -C17 ) were used to determine the early stages of diagenesis along the sediment core. Two climatic conditions were distinguished (warm/humid and cold/dry) based on an n -alkane proxy, and the observed changes in δ13 C of individual n -alkane (δ13 CALK ) between the Holocene and glacial periods were attributed to changes in plant distribution/type. Clear differences were not found in the calculated alkenone sea surface temperature (SST) between those of the Holocene and glacial periods. This anomaly during the glacial period might be attributed to the seasonal water mass distribution in the Yellow Sea or a seasonal shift in the timing of maximum alkenone production as well as the Bølling/Allerød interstadial.
A. O. Badejo et al.
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