Environmental controls on the distribution of GDGT molecules in Lake Höglwörth, Southern Germany

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Organic Geochemistry Pub Date : 2023-10-04 DOI:10.1016/j.orggeochem.2023.104689
Sudip Acharya , Roland Zech , Paul Strobel , Marcel Bliedtner , Maximilian Prochnow , Cindy De Jonge
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Abstract

Tetraether lipids, such as glycerol dialkyl glycerol tetraethers (GDGTs), are an increasingly used proxy for reconstructing paleoclimatic and paleoenvironmental dynamics. On a global scale, environmental drivers controlling the distribution of GDGTs in lake systems have been described extensively. However, the drivers that control down-core sedimentary GDGT composition within single lake systems are still poorly constrained. Here, we analysed GDGTs in a sediment core collected from Lake Höglwörth (Bavaria, Germany) covering the last ∼1100 years. The increase in ratio ΣIIIa/ΣIIa values (a ratio which captures the variation of 3 structural isomers of penta- and hexamethylated brGDGTs respectively) reflects a higher contribution of branched (br) GDGTs from aquatic sources after 1800 CE. This is synchronous with a high nutrient input as a result of increased local anthropogenic activities. The climate proxy methylation of branched tetraethers (MBT'5ME) reveals a pattern that deviates from the anticipated temperature changes during the last millennium. Instead, high MBT'5ME values from ∼880 to 1120 CE coincide with a period of increased soil input, resulting from lake damming and/or construction of the Höglwörth monastery. Decreased values after 1800 CE until present date correspond to a higher contribution of aquatic brGDGTs, with changes in the dependency between Ia and IIa suggesting a direct influence of bacterial community changes on the MBT'5ME. The proxy cyclisation of branched tetraethers (CBT') shows a linear increase with time, and a stepwise increase at 1700 CE, when a creek stream inflow channel was rerouted. Over time, MBT’5ME decreases gradually, while CBT’ and ΣIIIa/ΣIIa increase. This is hypothesized to be potentially caused by decreasing water depth over time and/or post- or syn-sedimentary production of GDGTs. The degree of cyclization (DC') shows variations on shorter timescales, possibly driven by the lake mixing regime and water column redox conditions. Our results indicate that caution must be taken when interpreting GDGTs for paleoclimate and paleoenvironmental reconstruction considering the possible influence of shifts in the provenance of brGDGTs. Further studies focusing on both sedimentary and intact polar lipids are highly recommended to constrain the source (water column, or sedimentary production) of GDGTs in lake sediments.

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德国南部Höglwörth湖GDGT分子分布的环境控制
四醚脂质,如甘油二烷基甘油四醚(GDGTs),是重建古气候和古环境动力学的一种越来越多的替代品。在全球范围内,控制GDGTs在湖泊系统中分布的环境驱动因素已被广泛描述。然而,控制单个湖泊系统内岩心沉积GDGT组成的驱动因素仍然受到很差的约束。在这里,我们分析了过去~1100年从Höglwörth湖(德国巴伐利亚州)收集的沉积物岩芯中的GDGTs。∑IIIa/∑IIa比值的增加(该比值分别反映了五甲基化和六甲基化brGDGTs的3种结构异构体的变化)反映了1800 CE后来自水生来源的支链(br)GDGTs贡献更大。这与当地人为活动增加带来的高营养输入同步。支链四醚的气候代理甲基化(MBT’5ME)揭示了一种偏离上千年预期温度变化的模式。相反,从~880到1120 CE的高MBT'5ME值与湖泊筑坝和/或Höglwörth修道院建设导致的土壤输入增加期相吻合。1800 CE之后到目前为止,数值的降低对应于水生brGDGTs的更高贡献,Ia和IIa之间的依赖性变化表明细菌群落变化对MBT’5ME的直接影响。支链四醚(CBT')的代理环化反应随着时间的推移呈线性增加,当小溪流入通道改道时,在1700 CE时呈逐步增加。随着时间的推移,MBT’5ME逐渐降低,而CBT’和∑IIIa/∑IIa增加。据推测,这可能是由于随着时间的推移水深下降和/或GDGTs的沉积后或同沉积期生产造成的。环化程度(DC')在较短的时间尺度上显示出变化,这可能是由湖泊混合状态和水柱氧化还原条件驱动的。我们的研究结果表明,在解释古气候和古环境重建的GDGTs时必须谨慎,考虑到brGDGTs物源变化的可能影响。强烈建议对沉积和完整的极性脂质进行进一步研究,以限制湖泊沉积物中GDGTs的来源(水柱或沉积产物)。
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来源期刊
Organic Geochemistry
Organic Geochemistry 地学-地球化学与地球物理
CiteScore
5.50
自引率
6.70%
发文量
100
审稿时长
61 days
期刊介绍: Organic Geochemistry serves as the only dedicated medium for the publication of peer-reviewed research on all phases of geochemistry in which organic compounds play a major role. The Editors welcome contributions covering a wide spectrum of subjects in the geosciences broadly based on organic chemistry (including molecular and isotopic geochemistry), and involving geology, biogeochemistry, environmental geochemistry, chemical oceanography and hydrology. The scope of the journal includes research involving petroleum (including natural gas), coal, organic matter in the aqueous environment and recent sediments, organic-rich rocks and soils and the role of organics in the geochemical cycling of the elements. Sedimentological, paleontological and organic petrographic studies will also be considered for publication, provided that they are geochemically oriented. Papers cover the full range of research activities in organic geochemistry, and include comprehensive review articles, technical communications, discussion/reply correspondence and short technical notes. Peer-reviews organised through three Chief Editors and a staff of Associate Editors, are conducted by well known, respected scientists from academia, government and industry. The journal also publishes reviews of books, announcements of important conferences and meetings and other matters of direct interest to the organic geochemical community.
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