A re-evaluation of the average chain length of lacustrine sedimentary n-alkanes as a paleoproxy on the Qinghai-Tibet Plateau

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers of Earth Science Pub Date : 2023-12-05 DOI:10.1007/s11707-022-1084-0
Mingda Wang, Qin Li, Jaime Toney, David Henderson, Juzhi Hou
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Abstract

Long-chain n-alkanes are one of the most common organic compounds in terrestrial plants and they are well-preserved in various geological archives. nalkanes are relatively resistant to degradation and thus they can provide high-fidelity records of past vegetation and climate changes. Nevertheless, previous studies have shown that the interpretation of n-alkane proxies, such as the average chain length (ACL), is often ambiguous since this proxy depends on more than one variable. Both vegetation and climate could exert controls on the n-alkane ACL, and hence its interpretation requires careful consideration, especially in regions like the Qinghai-Tibet Plateau (QTP) where topography, biome type and moisture source are highly variable. To further evaluate the influences of vegetation and climate on the ACL in highelevation lakes, we examined the n-alkane distributions of the surface sediments of 55 lakes across the QTP. Our results show that the ACL across a climatic gradient is significantly affected by precipitation, rather than by temperature. The positive correlation between ACL and precipitation may be because of the effect of microbial degradation during deposition. Finally, we suggest that more caution is needed in the interpretation of ACL data in different regions.

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青藏高原湖相沉积正构烷烃平均链长作为古代用物的再评价
长链正构烷烃是陆生植物中最常见的有机化合物之一,在各种地质档案中保存完好。烷烃相对不易退化,因此它们可以提供过去植被和气候变化的高保真记录。然而,先前的研究表明,正构烷烃的代理解释,如平均链长(ACL),往往是模棱两可的,因为这个代理取决于多个变量。植被和气候都可能对正构烷烃ACL产生控制作用,因此对正构烷烃ACL的解释需要慎重考虑,特别是在青藏高原等地形、生物群系类型和水分来源变化很大的地区。为进一步评价植被和气候对高海拔湖泊地表沉积物正构烷烃分布的影响,研究了青藏高原55个湖泊地表沉积物正构烷烃分布特征。我们的研究结果表明,在气候梯度上,ACL受降水的影响显著,而不是受温度的影响。ACL与降水呈正相关关系可能是由于沉积过程中微生物降解的影响。最后,我们建议在解释不同地区的ACL数据时需要更加谨慎。
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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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