Co-evolution of the terrestrial and aquatic ecosystem in the Holocene Baltic Sea
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Published:2022-02-04
Issue:2
Volume:18
Page:233-248
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
Weiss Gabriella M.ORCID, Lattaud JulieORCID, van der Meer Marcel T. J.ORCID, Eglinton Timothy I.
Abstract
Abstract. The Baltic Sea experienced changes in marine input throughout the Holocene as
substantial regional ice retreat led to isostatic adjustment, eustatic sea
level change, and periodic isolation from the North Sea. Here, we determine
the distributions and isotopic signatures of organic compounds preserved in a
sediment record spanning the last ∼11 kyr to reconstruct
environmental change under these dynamic conditions. Carbon and hydrogen
isotope ratios of short-, mid-, and long-chain n-alkanes, along with
long-chain diol and glycerol dialkyl glycerol tetraether abundances, were
analyzed in sediments sampled from the Arkona Basin in the southwestern Baltic
Sea. In the earlier part of the record (specifically 10–8.2 ka),
hydrogen isotope values of higher plant-derived n-alkanes revealed a change
in dominant water source from an ice-melt-derived to a precipitation-dominated
hydrological regime. Following this shift in water source, carbon isotope
values of n-alkanes suggest diversification of vegetation. Shifts in
hydrology and vegetation did not coincide with established phase boundaries
but instead occurred mid-phase or spanned phase transitions. For this reason,
we suggest describing the Ancylus Lake in two phases: a meltwater phase (10.6
to 9.2 ka) and a precipitation phase (9.2 to 7.7 ka). Our
results highlight the utility of using C and H isotope ratios in conjunction
with other compound abundance proxies to better understand the complex
environmental change recorded in paleoarchives.
Funder
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
Reference96 articles.
1. Aichner, B., Herzschuh, U., and Wilkes, H.: Influence of aquatic macrophytes on the stable carbon isotopic signatures of sedimentary organic matter in lakes on the Tibetan Plateau, Org. Geochem., 41, 706–718, https://doi.org/10.1016/j.orggeochem.2010.02.002, 2010. 2. Aichner, B., Hilt, S., Périllon, C., Gillefalk, M., and Sachse, D.: Biosynthetic hydrogen isotopic fractionation factors during lipid synthesis in submerged aquatic macrophytes : Effect of groundwater discharge and salinity, Org. Geochem., 113, 10–16, https://doi.org/10.1016/j.orggeochem.2017.07.021, 2017. 3. Alhonen, P.: The stages of the Baltic Sea as indicated by the diatom
stratigraphy, Societas pro Fauna et Flora Fennica, Helsinki – Helsingfors, available at: https://helda.helsinki.fi/bitstream/handle/10138/36720/299944_092_1971.pdf?sequence=1 (last access: 29 January 2022), 1971. 4. Andrén, E., Andrén, T., and Sohlenius, G.: The Holocene history of the southwestern Baltic Sea as reflected in a sediment core from the Bornholm Basin, Boreas, 29, 233–250, https://doi.org/10.1111/j.1502-3885.2000.tb00981.x, 2000. 5. Andrén, T., Björck, S., Andrén, E., Conley, D., Zillén, L., and Anjar, J.: The development of the Baltic Sea Basin during the last 130 ka, in: The Baltic Sea Basin, Springer, Berlin, Heidelberg, 75–97, https://doi.org/10.1007/978-3-642-17220-5_4, 2011.
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