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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24989

Title: Paleoenvironmental changes in the northern South China Sea over the past 28,000 years: A study of TEX86-derived sea surface temperatures and terrestrial biomarkers
Authors: Tomoya Shintani;Masanobu Yamamoto;Min-Te Chen
Contributors: NTOU:Institute of Applied Geosciences
國立臺灣海洋大學:應用地球科學研究所
Keywords: South China Sea;TEX86;;Paleotemperature;Biomarkers;Terrestrial organic matter;Late Quaternary
Date: 2011-04-02
Issue Date: 2011-10-20T08:18:48Z
Publisher: Journal of Asian Earth Sciences
Abstract: abstract:We have generated a record of TEX86 ()-derived sea surface temperatures (SSTs) over the last 28 ka for core MD97-2146 from the northern South China Sea (SCS). The -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 -derived temperature is almost the same as that in foraminiferal Mg/Ca ratio-derived temperature, but it is larger than those in 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 , and (3) the underestimation of temperature change by and transfer function approaches. The similar variation in -derived temperature at the study site and Chinese stalagmite δ18O during the last deglaciation suggests that changes in -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.
Relation: 40(6), pp.1221–1229
URI: http://ntour.ntou.edu.tw/handle/987654321/24989
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