Glycerol dialkyl glycerol tetraethers signature in sediments of the East China Sea and its implication on marine and continental climate and environment records
Glycerol dialkyl glycerol tetraethers signature in sediments of the East China Sea and its implication on marine and continental climate and environment records
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东海沉积物中的甘油二烷基甘油四醚特征及其对海洋和大陆气候和环境记录的意义
DOI：
10.1016/j.ecolind.2019.04.040
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发表时间：
2019-08
影响因子：
6.9
通讯作者：
Huamao Yuan
中科院分区：
文献类型：
--
作者：
Liqin Duan;Jinming Song;Xuegang Li;Huamao Yuan
对东海 (ECS) 表层沉积物中的甘油二烷基甘油四醚 (GDGT) 进行了测定，以评估其在古气候和环境重建方面的潜力。类异戊二烯GDGTs（isoGDGTs）范围为516.75ng/g至1365ng/g，主要成分为crenarchaeol（cren）和caldarchaeol（GDGT-0）。 IsoGDGTs 主要来源于海洋浮游奇古菌。支链 GDGT (brGDGT) 范围为 12.3ng/g 至 123.5ng/g，主要为 GDGT-I 和 GDGT-II。分数和分布，结合支链/类异戊二烯四醚指数（BIT）和brGDGT甲基化和环化指数（MBT-CBT）表明，ECS中的brGDGT主要来自陆地土壤，它们可用于重建气候。 TEX86 得出的秋季海面温度 (SST) 接近于卫星得出的秋季海表温度。通过局部和全球校准，MBT/CBT 得出的内陆架年平均气温（MAAT）和 CBT pH 值与长江下游流域实测 MAAT 和土壤 pH 值吻合良好，这似乎适合东海周边大陆的古气候和环境重建。此外，cren 和甲烷指数对溶解氧变化表现出敏感的响应，表明它们作为古氧化还原指标的潜力。
Glycerol dialkyl glycerol tetraethers (GDGTs) were determined in surface sediments from the East China Sea (ECS) in order to evaluate their potential for palaeo-climate and environmental reconstructions. Isoprenoid GDGTs (isoGDGTs) ranged from 516.75 ng/g to 1365 ng/g and crenarchaeol (cren) and caldarchaeol (GDGT-0) were the main components. IsoGDGTs were mainly derived from marine planktonic Thaumarchaeota. Branched GDGTs (brGDGTs) ranged from 12.3 ng/g to 123.5 ng/g and were dominated by GDGT-I and GDGT-II. The fractions and distributions, combined with branched/isoprenoid tetraether index (BIT) and methylation and cyclization indexes of brGDGT (MBT-CBT) suggested that brGDGTs in the ECS were mainly derived from terrestrial soils and they could be used to reconstruct climates. The TEX86-derived sea surface temperatures (SST) were close to the satellite-derived SST in autumn. The MBT/CBT-derived mean annual air temperatures (MAATs) and CBT-derived pH values in inner shelf by local and global calibrations matched well with the measured MAATs and soil pH in the lower Changjiang River basin, which seem to be appropriate for palaeo-climate and environment reconstructions of the continent around the ECS. Besides, cren and methane index showed a sensitive response to dissolved oxygen variation, suggesting their potential as palaeo-redox proxy.
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影响因子：
2.3
作者：
通讯作者：
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影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
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DOI：
10.1016/j.gsf.2012.10.002
发表时间：
2013-03
期刊：
地学前缘(英文版)
影响因子：
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作者：
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通讯作者：
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