A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean
A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean
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南大洋太平洋部分顶部沉积物中保存的一组潜在的长链正构烷烃和烯酮气候标记
DOI：
10.1186/s40645-021-00416-9
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发表时间：
2020-08
影响因子：
3.9
通讯作者：
Min-Te Chen
中科院分区：
文献类型：
--
作者：
Xin Chen;Xiaodong Liu;Da-Cheng Lin;Jianjun Wang;Liqi Chen;Pai-Sen Yu;Linmiao Wang;Zhifang Xiong;Min-Te Chen
调查海洋沉积物中的有机化合物可能会在这些气候档案中揭示大量新信息。在这里，我们提出的长链正构烷烃和烯酮的有机地球化学特征和长链正构烷烃的单个碳同位素比值的初步研究结果，从一个新收集的，约8米长，位于南大洋的太平洋部门的远河段。我们分析了地核中的一系列有机化合物。结果表明，丰富的长链正构烷烃（C29-C35）与占主导地位的奇数比偶数碳的偏好，这表明陆地高等植物蜡通过长距离运输的灰尘，可能来自澳大利亚和新西兰的起源。C31正构烷烃的δ 13 C值在−29.4 ‰到−24.8‰之间，其中较高的δ 13 C值表明C4植物蜡的贡献较大。在分析中，我们发现，中链正构烷烃（C23-C25）有一个小的奇数比偶数的碳偏好，表明他们来自海洋非硅藻浮游植物和微藻和陆地来源。此外，C26和C28的δ 13 C值较低（~−34‰），表明它们来自海洋化能自养细菌。我们发现，四不饱和烯酮（C37：4）在这个南大洋沉积物芯的丰度范围从11%到37%，可能是低海表温度（SST）的标志。研究结果表明，长链正构烷烃的δ ~（13）C值和长链正构烷烃的δ ~（13）C值与长链正构烷烃的δ ~（13）C值和长链正构烷烃的δ ~（13）C值之间存在着一定的相关性
U
37
K
指数对重建南大洋高纬度地区C3/C4植物和SST变化的详细历史具有潜在的意义。
Investigating organic compounds in marine sediments can potentially unlock a wealth of new information in these climate archives. Here, we present pilot study results of organic geochemical features of long-chain n-alkanes and alkenones and individual carbon isotope ratios of long-chain n-alkanes from a newly collected, approximately 8 m long, located in the far reaches of the Pacific sector of the Southern Ocean. We analyzed a suite of organic compounds in the core. The results show abundant long-chain n-alkanes (C29–C35) with predominant odd-over-even carbon preference, suggesting an origin of terrestrial higher plant waxes via long-range transport of dust, possibly from Australia and New Zealand. The δ13C values of the C31n-alkane range from −29.4 to −24.8‰, in which the higher δ13C values suggest more contributions from C4 plant waxes. In the analysis, we found that the mid-chain n-alkanes (C23–C25) have a small odd-over-even carbon preference, indicating that they were derived from marine non-diatom pelagic phytoplankton and microalgae and terrestrial sources. Furthermore, the C26 and C28 with lower δ13C values (~−34‰) indicate an origin from marine chemoautotrophic bacteria. We found that the abundances of tetra-unsaturated alkenones (C37:4) in this Southern Ocean sediment core ranges from 11 to 37%, perhaps a marker of low sea surface temperature (SST). The results of this study strongly indicate that the δ13C values of long-chain n-alkanes and $$ {U}_{37}^{\mathrm{k}} $$
U
37
k
index are potentially useful to reconstruct the detailed history of C3/C4 plants and SST change in the higher latitudes of the Southern Ocean.
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影响因子：
5.3
作者：
通讯作者：
--
影响因子：
5
作者：
E. Sikes;J. Volkman;L. Robertson;J. Pichon
通讯作者：
E. Sikes;J. Volkman;L. Robertson;J. Pichon
影响因子：
5
作者：
E. Sikes;J. Volkman
通讯作者：
E. Sikes;J. Volkman
影响因子：
4
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通讯作者：
J. Holtvoeth;Jessica H. Whiteside;S. Engels;Felipe S. Freitas;K. Grice;P. Greenwood;SC Johnson;Iain P. Kendall;S. Lengger;A. Lücke;C. Mayr;B. Naafs;M. Rohrssen;J. Sepúlveda
影响因子：
1.8
作者：
G. Matsumoto;Eisuke Honda;Kazuhiko Sonoda;Shuichi Yamamoto;T. Takemura
通讯作者：
G. Matsumoto;Eisuke Honda;Kazuhiko Sonoda;Shuichi Yamamoto;T. Takemura