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Hydrological and ecological changes in western Europe between 3200 and 2000 years BP derived from lipid biomarker delta D values in lake Meerfelder Maar sediments

Rach, O. and Engels, S. and Kahmen, A. and Brauer, A. and Martin-Puertas, C. and van Geel, B. and Sachse, D.. (2017) Hydrological and ecological changes in western Europe between 3200 and 2000 years BP derived from lipid biomarker delta D values in lake Meerfelder Maar sediments. Quaternary Science Reviews, 172. pp. 44-54.

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Official URL: http://edoc.unibas.ch/58686/

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Abstract

One of the most significant Late Holocene climate shifts occurred around 2800 years ago, when cooler and wetter climate conditions established in western Europe. This shift coincided with an abrupt change in regional atmospheric circulation between 2760 and 2560 cal years BP, which has been linked to a grand solar minimum with the same duration (the Homeric Minimum). We investigated the temporal sequence of hydroclimatic and vegetation changes across this interval of climatic change (Homeric climate oscillation) by using lipid biomarker stable hydrogen isotope ratios (ED values) and pollen assemblages from the annually-laminated sediment record from lake Meerfelder Maar (Germany).Over the investigated interval (3200-2000 varve years BP), terrestrial lipid biomarker ED showed a gradual trend to more negative values, consistent with the western Europe long-term climate trend of the Late Holocene. At ca. 2640 varve years BP we identified a strong increase in aquatic plants and algal remains, indicating a rapid change in the aquatic ecosystem superimposed on this long-term trend. Interestingly, this aquatic ecosystem change was accompanied by large changes in ED values of aquatic lipid biomarkers, such as nC(21) and nC(23) (by between 22 and 30%(0)). As these variations cannot solely be explained by hydroclimate changes, we suggest that these changes in the Wag value were influenced by changes in n-alkane source organisms. Our results illustrate that if ubiquitous aquatic lipid biomarkers are derived from a limited pool of organisms, changes in lake ecology can be a driving factor for variations on sedimentary lipid MN values, which then could be easily misinterpreted in terms of hydro climatic changes. (C) 2017 Elsevier Ltd. All rights reserved.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Botanik > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Kahmen, Ansgar
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier
ISSN:0277-3791
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:04 Jun 2018 06:53
Deposited On:04 Jun 2018 06:53

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