Stein, Ruediger; Frederichs, Thomas; Fahl, Kirsten; Geibert, Walter; Matthiessen, Jens; Niessen, Frank; Vogt, Christoph; Sassenroth, Cynthia; Bazhenova, Evgenia A: Biomarkers of sediment core PS115/2_2 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.975976 (dataset in review), In: Stein, R et al.: A 430 kyrs multi-proxy record of Eurasian Ice Sheet history and organic carbon burial in the eastern Eurasian Basin, Arctic Ocean [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.975790 (dataset in review)
Abstract:
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. Based on the presence of specific biomarkers indicative for increased preservation of labile algae-type OC under anoxic sedimentary conditions, we demonstrate that even during strong glacial intervals there must have been at least occasionally open-water (polynya-type) conditions along the Eurasian continental margin in front of the ice sheet with marine and sea-ice algae productivity (cf., Fahl & Stein, 2012; Naafs et al., 2024). For details and methods, we also refer to Stein et al. (this paper).
References:
Fahl, Kirsten; Stein, Ruediger (2012): Modern seasonal variability and deglacial/Holocene change of central Arctic Ocean sea-ice cover: New insights from biomarker proxy records. Earth and Planetary Science Letters, 351-352, 123-133, https://doi.org/10.1016/j.epsl.2012.07.009
Naafs, Bernhard David A; Blewett, Jerome; Pancost, Richard D (2024): Bacterial diether lipids as a novel proxy to reconstruct past changes in sedimentary oxygenation. Geochimica et Cosmochimica Acta, S0016703724003922, https://doi.org/10.1016/j.gca.2024.07.036
Stein, Ruediger (2019): The Expedition PS115/2 of the Research Vessel POLARSTERN to the Arctic Ocean in 2018. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 728, 249 pp, https://doi.org/10.2312/BzPM_0728_2019
Funding:
Coverage:
Median Latitude: 81.244115 * Median Longitude: 123.481940 * South-bound Latitude: 81.244100 * West-bound Longitude: 123.479940 * North-bound Latitude: 81.244130 * East-bound Longitude: 123.483940
Date/Time Start: 2018-09-14T14:49:00 * Date/Time End: 2018-09-14T17:41:00
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 7.65 m
Event(s):
PS115/2_2-1 * Latitude: 81.244130 * Longitude: 123.479940 * Date/Time: 2018-09-14T14:49:00 * Elevation: -3665.0 m * Location: Arctic Ocean * Campaign: PS115/2 * Basis: Polarstern * Method/Device: Giant box corer (GKG)
PS115/2_2-2 * Latitude: 81.244100 * Longitude: 123.483940 * Date/Time: 2018-09-14T17:41:00 * Elevation: -3669.0 m * Location: Arctic Ocean * Campaign: PS115/2 * Basis: Polarstern * Method/Device: Box corer (BC)
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1105 data points