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Paleoenvironmental changes in the northern South China Sea over the past 28,000years: A study of TEX86-derived sea surface temperatures and terrestrial biomarkers

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Title: Paleoenvironmental changes in the northern South China Sea over the past 28,000years: A study of TEX86-derived sea surface temperatures and terrestrial biomarkers
Authors: Shintani, Tomoya Browse this author
Yamamoto, Masanobu Browse this author →KAKEN DB
Chen, Min-Te Browse this author
Keywords: South China Sea
TEX86
UK'37
Paleotemperature
Biomarkers
Terrestrial organic matter
Late Quaternary
Issue Date: 2-Apr-2011
Publisher: Elsevier
Journal Title: Journal of Asian Earth Sciences
Volume: 40
Issue: 6
Start Page: 1221
End Page: 1229
Publisher DOI: 10.1016/j.jseaes.2010.09.013
Abstract: We have generated a record of TEX86 (TEXH86)-derived sea surface temperatures (SSTs) over the last 28 ka for core MD97-2146 from the northern South China Sea (SCS). The TEXH86-derived temperature of a core-top sample corresponds to the SSTs in warmer seasons. The SST record shows a drop during the Oldest Dryas period, an abrupt rise at the onset of the Bølling–Allerød period, a plateau across the Younger Dryas period, and an abrupt rise at the beginning of the Holocene. The glacial–interglacial contrast in TEXH86-derived temperature is almost the same as that in foraminiferal Mg/Ca ratio-derived temperature, but it is larger than those in UK'37 and transfer function-derived temperatures. Possible interpretations are: (1) the seasonal shift of glycerol dialkyl glycerol tetraether (GDGT) production, (2) the overestimation of temperature change by TEXH86, and (3) the underestimation of temperature change by UK'37 and transfer function approaches. The similar variation in TEXH86-derived temperature at the study site and Chinese stalagmite δ18O during the last deglaciation suggests that changes in TEXH86-derived temperature in this period reflected atmospheric and oceanic reorganization on a millennial timescale. The long-chain n-alkanes are mainly of higher plant origin before ∼14 ka and a mixture of higher plant and lithic origins after ∼14 ka; the abundance ratio of long-chain to short-chain n-fatty acids decreases at ∼15 ka, suggesting a drastic change in sediment sources at ∼14–15 ka. We attribute the higher content of fresh higher plant n-alkanes and long-chain n-fatty acids before ∼14–15 ka to enhanced aeolian transportation and/or arid environments. Increased precipitation likely due to intensified summer monsoon after ∼14–15 ka enhanced the erosion of sedimentary rocks and increased the contribution of lithic n-alkanes.
Type: article (author version)
URI: http://hdl.handle.net/2115/51239
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本 正伸

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