Organic geochemical data including leaf wax hydrogen isotopes from Sokli, Northern Finland

Christos Katrantsiotis, Rienk Smittenberg, Elin Norström

The dataset contains bulk geochemical data (TOC, TN, bulk δ¹³C and δ¹⁵N), leaf wax concentrations and their hydrogen isotope composition, from the Eemian (penultimate interglacial) paleolake sediment core at Sokli, Northern Finland.

The data are used to interpret past climate conditions in the sub-arctic region of northern Fennoscandia , particularly seasonal changes in temperature, which relates to atmospheric circulation patterns, in response to orbital forcing.

The data covers the period from 131,000⁠ – ⁠118,000 years before present.

Citation

Christos Katrantsiotis, Rienk Smittenberg, Elin Norström (2021) Organic geochemical data including leaf wax hydrogen isotopes from Sokli, Northern Finland. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/katrantsiotis-2021-sokli-1

References

Katrantsiotis C, Norström E, Smittenberg RH, Salonen JS, Plikk A, Helmens K (2021) Seasonal variability in temperature trends and atmospheric circulation systems during the Eemian (Last Interglacial) based on n-alkanes hydrogen isotopes from Northern Finland. Quaternary Science Review (accepted).

Data description

Data are provided in one spreadsheet (xlsx) file with four tabs and in four corresponding comma-separated values (csv) files containing:

• Readme
• Bulk geochemistry data against core depth and age: Total Organic Carbon (TOC), Total Nitrogen (TN), bulk δ¹³C, bulk δ¹⁵N, C/N ratio.
• Leaf wax alkane concentrations (C23, C25 C27, C29, C31) against depth and age.
• Leaf wax hydrogen isotope data (δD23, δD25 δD27, δD29, δD31) against depth and age.

Comments

Please cite the accompanying paper by Katrantsiotis et al. when using this dataset.

This dataset was compiled for a study that aims to understand seasonal evolution of sub-arctic temperature trends and related changes in the atmospheric circulation systems during the last interglacial. The analysis was performed in a sediment core retrieved from Sokli in 2010. The geochemical analyses were performed in 2018⁠ – ⁠2019. TOC, TN and δ¹³Corg were quantified with a Carlo Erba NC2500 elemental analyzer coupled with a Finnigan MAT Delta V mass spectrometer at the Stable Isotope Laboratory, Stockholm University. Total lipid extracts were obtained via sonication of freeze-dried and powdered sediment samples at the department of Geological Sciences, Stockholm University. The hydrocarbon fractions were analyzed by gas chromatography–mass spectrometry (Shimadzu-QP2010 Ultra system), for n-alkane identification and quantification. The stable hydrogen isotopic composition (deuterium/hydrogen ratio) of n-alkanes (δD) was analyzed using a Thermo gas chromatography-isotope ratio mass spectrometry (GC-IRMS) system at the department of Environmental Sciences, Stockholm University.

Our study complements the scarcely available Eemian proxy data from high-latitude continental regions and contributes to a better understanding of sub-arctic seasonal signal in temperatures trends and the related atmospheric drivers, which have remained poorly constrained for this interglacial period.

We acknowledge Anna Hägglund in particular for assistance while operating the GC-IRMS, Klara Hajnal with the assistance of extracting n-alkanes and the preparations of samples for bulk isotope analysis and Heike Siegmund for the assistance of bulk isotope analysis at the Stable Isotope Laboratory at Stockholm University.

Roles of the responsible scientists: Christos Katrantsiotis (data creator), Rienk Smittenberg and Elin Norström (PI).