Isotope data (Δ¹⁴C, δ¹³C and δD) for dissolved methane at the Outer Eurasian Arctic Shelf

Julia Steinbach, Henry Holmstrand, Örjan Gustafsson

Isotope data for dissolved methane determined in samples collected from vertical and bottom-water horizontal casts in the outer Laptev Sea.

The data was collected during the SWERUS-C3 expedition to the Arctic Ocean with Swedish icebreaker Oden during summer 2014, and compiled to apportion the sources of methane being released from the ocean bottom and causing highly elevated methane concentrations in the Laptev Sea water column.

The dataset was prepared for the first study in this region to use the combination of radiocarbon, δ¹³C and δD to deduce the sources of methane escaping from the sea floor.

Citation

Julia Steinbach, Henry Holmstrand, Örjan Gustafsson (2021) Isotope data (Δ¹⁴C, δ¹³C and δD) for dissolved methane at the Outer Eurasian Arctic Shelf. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/oden-swerus-2014-methane-isotopes-1

References

Steinbach J, Holmstrand H, Shcherbakova K, Kosmach D, Brüchert V, Shakhova N, Salyuk A, Sapart CJ, Chernykh D, Noormets R, Semiletov I, Gustafsson Ö (2021) Source apportionment of methane escaping the subsea permafrost system in the Outer Eurasian Arctic Shelf. PNAS 118. https://doi.org/10.1073/pnas.2019672118

Data description

The data is provided in one spreadsheet (xlsx) file with three tabs. File content:

Sample list

• Sample ID, sampling device, depth, lon-lat coordinates and time of sampling
• Salinity, temperature, oxygen concentration and carbon dioxide concentration of the seawater
• Concentration, δD and δ¹³C of dissolved methane in seawater

Triple isotope samples

• Concentration, δD, δ¹³C and Δ¹⁴C for dissolved methane in select seawater samples
• Regression analysis results for Keeling plots of δD, δ¹³C and Δ¹⁴C to obtain the methane isotope signature of the seafloor methane seeps

¹⁴C results

• ¹⁴C of dissolved methane and CO₂, and parameters that were used for these calculations

The same data is also provided in three comma-separated values (csv) files, stored with Western Europe (ISO-8859-15/EURO) character set.

Comments

Please, cite the article by Steinbach et al. (2021) when using this dataset.