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- W3015274073 endingPage "119622" @default.
- W3015274073 startingPage "119622" @default.
- W3015274073 abstract "Long-chain (C21-C33) n-alkan-2-ones are biomarkers ubiquitous in peat deposits. However, their paleoenvironmental significance lacks constraints. Here we evaluate the influence pH exerts on the occurrence of long-chain n-alkan-2-ones in Chinese peats. A comparison of the distribution in a collection (n = 65) of modern peat samples with different pH (pH values 4.4–8.6) from China demonstrates that their distribution is significantly different in acid compared to alkaline peat. This difference can be explained by the pH control on the conversion of n-alkan-2-one precursor compounds (n-alkanes and fatty acids). Transfer functions between pH and n-alkan-2-one ratios were established using linear and logarithmic regression models. We then applied these proxies to reconstruct variations of paleo-pH in the Dajiuhu peat sequence to identify the history of peatland acidification over the last 13 kyr. We find significant changes in paleo-pH during the deglaciation/early Holocene and relate these to times of dry climate in the region. The drought-induced peat acidification is supported by observations from modern drying events in the peatland. We propose that long-chain n-alkan-2-ones in peats have potential to trace paleo-pH changes across the deglaciation and Holocene, although further research from different peatlands and time periods is still needed." @default.
- W3015274073 created "2020-04-17" @default.
- W3015274073 creator A5020420808 @default.
- W3015274073 creator A5027232900 @default.
- W3015274073 creator A5077428965 @default.
- W3015274073 creator A5081196261 @default.
- W3015274073 date "2020-06-01" @default.
- W3015274073 modified "2023-10-15" @default.
- W3015274073 title "The distribution of long-chain n-alkan-2-ones in peat can be used to infer past changes in pH" @default.
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