Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cpd-10-1527-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
09 Apr 2014
Review status
This discussion paper has been under review for the journal Climate of the Past (CP). The revised manuscript was not accepted.
A paleoenvironmental reconstruction of the last 15 000 cal yr BP via Yellow Sea sediments using biomarkers and isotopic composition of organic matter
A. O. Badejo1, B.-H. Choi1, H.-G. Cho2, H.-I. Yi3, and K.-H. Shin1 1Department of Environmental Marine Sciences, Hanyang University, Ansan, 426-791, Korea
2Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University, Jinju, 660-701, Korea
3Marine Geoenvironmental Research Divisions, Korea Institute of Ocean Science and Technology (KIOST), Ansan, 425-170, Korea
Abstract. 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 (δ13Corg), the atomic ratio of carbon and nitrogen (C/N ratio), and biomarker content. The sedimentary δ13Corg profile along the core exhibited more negative δ13Corg 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 δ13C of individual n-alkane (δ13CALK) 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.

Citation: Badejo, A. O., Choi, B.-H., Cho, H.-G., Yi, H.-I., and Shin, K.-H.: A paleoenvironmental reconstruction of the last 15 000 cal yr BP via Yellow Sea sediments using biomarkers and isotopic composition of organic matter, Clim. Past Discuss., 10, 1527-1565, https://doi.org/10.5194/cpd-10-1527-2014, 2014.
A. O. Badejo et al.
A. O. Badejo et al.

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