Sources and accumulation rates of terrestrial carbon in circum-Arctic shelf sediments

Jannik Martens, Örjan Gustafsson

This dataset contains terrestrial organic carbon (terrOC) mass accumulation rates in surface sediments of the seven circum-Arctic shelf seas, observational data on relative terrOC release using the integrated carbon remobilization index (I-CRI), terrOC and marine OC source fractions in circum-Arctic shelf sediments, a data collection of mass accumulation rates in surface sediments using ²¹⁰Pb-xs, as well as ¹³C and ¹⁴C data of terrOC source compartments in the circum-Arctic drainage basin.

The dataset has been used to quantify the contribution of terrOC from different sources to circum-Arctic shelf sediments using dual-isotope (¹³C and ¹⁴C) source apportionment and ²¹⁰Pb-xs mass accumulation rates. This work uses spatially-distributed data on ¹³C, ¹⁴C and total OC from the Circum-Arctic Sediment Carbon Database — CASCADE.

Citation

Jannik Martens, Örjan Gustafsson (2022) Sources and accumulation rates of terrestrial carbon in circum-Arctic shelf sediments. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/martens-2022-arctic-terroc-1

References

Martens J, Wild B, Semiletov I, Dudarev OV, Gustafsson Ö (2022) Circum-Arctic patterns of terrestrial carbon remobilization reveal contrasting vulnerability between regions and carbon sources. Nature Communications.

Data description

The dataset contains supplementary information to the Martens et al. (2022) study.

The file martens-ea-2022-SI-tables.xlsx contains seven data tables, with content as detailed below:

• Supplementary Table 1: Calculated accumulation (mean ± s.d.) of OC fractions per shelf sea in Tg yr⁻¹
• Supplementary Table 2: Terrestrial OC stocks in the circum-Arctic drainage basin (in Pg)
• Supplementary Table 3: Results of the Integrated Carbon Release Index (I-CRI) for the circum-Arctic shelf seas
• Supplementary Table 4: End members for the dual-isotope mixing model to calculate OC source fractions
• Supplementary Table 5: Results of the dual-isotope source apportionment
• Supplementary Table 6: Collection of sediment mass accumulation rates (MAR) from the circum-Arctic shelves
• Supplementary Table 7: Radiochronological data for sediment core slices from the ESAS and the Kara Sea

The file martens-ea-2022-SI-data-1-end-member-database.xlsx contains a large collection of ¹³C and ¹⁴C data of terrOC end member compartments (i.e. surface soil, soil and peat, deep peat, Ice Complex Deposits and marine OC) across the circum-Arctic drainage basin.

Comments

The data presented in this dataset are also included in the supplementary information to the Martens et al. (2022) paper, but not in the form of separate Excel files as made available here. Please, cite the article by Martens et al. (2022) when using this dataset.

This work uses spatially-distributed data on ¹³C, ¹⁴C and total OC from The Circum-Arctic Sediment Carbon Database — CASCADE, version 2.

Matlab script for the dual-isotope source apportionment is available in the Bolin Centre Code Repository.