2021
DOI: 10.1017/rdc.2021.78
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DO RADIOCARBON AGES OF PLANT WAX BIOMARKERS AGREE WITH 14C-TOC/OSL-BASED AGE MODELS IN AN ARID HIGH-ALTITUDE LAKE SYSTEM?

Abstract: To elucidate the dynamics of terrestrial leaf waxes in a high-altitude lake system, we performed compound-specific radiocarbon analysis (CSRA) of long-chain n-alkanes in two sediment core sections from Lake Karakul (Pamirs, Tajikistan) and in surface soil samples from the catchment area. We aimed to answer the question whether the n-alkanes are delivered into the lake sediment with substantial delay due to storage in soils, which may cause a potential bias when used as paleoenvironmental proxies. In the surfac… Show more

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Cited by 5 publications
(5 citation statements)
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“…This is important both for understanding the source of OM buried in the lake, and for interpreting OM and biomarker‐based paleoclimate proxy records in lake sediment cores. Our data are consistent with similar studies showing soil carbon‐derived leaf waxes with centennial to millennial transit times being buried in lake sediments (Aichner et al., 2021; Douglas et al., 2014; Freimuth et al., 2021; Gierga et al., 2016; Kruger et al., 2022). Our data from Lake Izabal provide evidence that pre‐aged leaf waxes can be an important input to non‐karst tropical lake basins.…”
Section: Discussionsupporting
confidence: 92%
See 1 more Smart Citation
“…This is important both for understanding the source of OM buried in the lake, and for interpreting OM and biomarker‐based paleoclimate proxy records in lake sediment cores. Our data are consistent with similar studies showing soil carbon‐derived leaf waxes with centennial to millennial transit times being buried in lake sediments (Aichner et al., 2021; Douglas et al., 2014; Freimuth et al., 2021; Gierga et al., 2016; Kruger et al., 2022). Our data from Lake Izabal provide evidence that pre‐aged leaf waxes can be an important input to non‐karst tropical lake basins.…”
Section: Discussionsupporting
confidence: 92%
“…There are relatively few data from lake sediments that can be used to understand patterns in the soil residence time of plant wax lipids. Available data imply that centennial to millennial age offsets between plant wax 14 C ages and the age of sediment deposition are common (Aichner et al., 2021; Freimuth et al., 2021; Gierga et al., 2016; Yamamoto et al., 2020), but there is no clear indication of geomorphological or ecological variables that control variation in these offsets. There are only a few data sets from tropical lake sediments, which generally point to age offsets between 200 and 1,000 years (Douglas et al., 2014; Kruger et al., 2022; Uchikawa et al., 2008).…”
Section: Introductionmentioning
confidence: 99%
“…Decreasing TOC age offsets (such as at 720–725 cm and 988–993 cm in LJL), thus, indicate decreasing contributions from ancient/petrogenic terrigenous OC sources and vice versa. The reverse pattern, where TOC is younger than alkyl lipids, such as at 103–108 cm in LJL or 4–8 cm depth in Allen Lake, likely indicates that autochthonous aquatic OC dominates the bulk OC pool and the pre‐aged signal is subdued in the bulk pool but still evident in terrigenous alkyl lipids supplied from soils or petrogenic sources such as OC‐rich rocks in the catchment (e.g., Aichner et al., 2021; Bröder et al., 2018). Explaining 14 C isotope differences between different alkyl lipids is more complex.…”
Section: Discussionmentioning
confidence: 99%
“…Aeolian transport of n-alkanes occurs on a regional scale and can lead to an age offset of one year (Freimuth et al 2021). During fluviatile transport Compound-Specific 14 C Dating on n-Alkanes 379 (Kusch et al 2010;Galy et al 2011;Ponton et al 2014;Häggi et al 2016;Hemingway et al 2016;Simoneit et al 2017), n-alkanes from sediments of different riparian areas can be mixed and enter the sediment trap (Aichner et al 2021). The river Sammetbach flows into the Holzmaar.…”
Section: Application Of Blank Assessment To Sediment Samplesmentioning
confidence: 99%