TC, TN, IC, TOC, CN, and accumulation rates of sediment core PS115/2_2

DOI

Sediment Core PS115/2-2 was recovered from the Amundsen Basin in 3600 m water depth at the eastern flank of the Gakkel Ridge during Polarstern Expedition PS115/2 in 2018 (Stein, 2019). The well-dated core is used to reconstruct in detail the interrelationship between ice-sheet dynamics and organic carbon burial in the central Eurasian Basin during the last 430 kyr, and to correlate marine and terrestrial records of the Eurasian Ice Sheet (EIS) history. Using organic-geochemical bulk parameters (i.e., TOC, C/N ratios, Rock Eval) and biomarkers, we have identified prominent well-defined sections with strongly elevated concentration of ancient (petrogenic) predominantly terrestrial OC, coinciding with glacial time intervals of extended ice sheets and the subsequent terminations/deglacials. For the measurement of bulk parameters by means of elemental analysis and Rock-Eval pyrolysis, freeze-dried and homogenized sediments were used. Total organic carbon (TOC) contents were measured by Carbon-Sulfur Analyser (CS-125, Leco) after removing carbonate with hydrochloric acid. Total carbon (TC) and total nitrogen (TN) contents were determined by Carbon-Nitrogen-Sulfur Analyser (Elementar III, Vario). Inorganic (carbonate) carbon (IC) was calculated as IC = TC-TOC. The C/N ratios used as a first-order proxy for estimating the marine (C/N = 5 to 8) and terrestrial (C/N >>10) proportions of the OC, were calculated as "TOC/TN" ratio. As the TN values in sediments from the Laptev Sea continental margin and adjacent deep sea as well as the sediments from Core PS115/2-2 may also contain significant amount of inorganic nitrogen, the C/N ratios of Core PS115/2-2 are certainly minimum values, i.e., when corrected for inorganic nitrogen the maxima of 14 to 16 would increase to 25 and more (cf., Stein & Fahl, 2004). Based on dry bulk density values and linear sedimentation rates, bulk sediment accumulation rates and, by considering TOC values, bulk TOC accumulation rates were calculated (cf., Stein & Fahl, 2004). For further details and methods, we refer to Stein et al. (this paper).

Identifier
DOI https://doi.pangaea.de/10.1594/PANGAEA.975805
Related Identifier IsPartOf https://doi.pangaea.de/10.1594/PANGAEA.975790
Related Identifier References https://doi.org/10.2312/BzPM_0728_2019
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.975805
Provenance
Creator Stein, Ruediger ORCID logo; Frederichs, Thomas ORCID logo; Fahl, Kirsten ORCID logo; Geibert, Walter ORCID logo; Matthiessen, Jens ORCID logo; Niessen, Frank ORCID logo; Vogt, Christoph ORCID logo; Sassenroth, Cynthia; Bazhenova, Evgenia A (ORCID: 0000-0002-8092-702X)
Publisher PANGAEA
Publication Year 2025
Funding Reference German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID STE 412/30 ArcOP-Pilot
Rights Creative Commons Attribution 4.0 International; Data access is restricted (moratorium, sensitive data, license constraints); https://creativecommons.org/licenses/by/4.0/
OpenAccess false
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 4164 data points
Discipline History; Humanities
Spatial Coverage (123.480W, 81.244S, 123.484E, 81.244N); Arctic Ocean
Temporal Coverage Begin 2018-09-14T14:49:00Z
Temporal Coverage End 2018-09-14T17:41:00Z