Citation:

PANGAEA.975790 (dataset in review)

Name: Radioactive isotope analysis of sediment core PS115/2_2
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Arctic Ocean; Eurasian Ice Sheet History; Late Pleistocene; Organic carbon (OC) burial

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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. Our age model, a fundamental prerequisite for any kind of paleoclimatic reconstruction, is based on magnetostratigraphy, 230Th and 231Pa excess (230Thex and 231Paex) records, and AMS14C ages. The radioisotopes 230Th, 232Th, 231Pa, 234U and 235U (238U) were analysed by means of isotope dilution sector field ICP-mass spectrometry (SF-ICP-MS). As independent age control proxies, extinction ages of 230Thex and 231Paex have been determined (cf., Hillaire-Marcell et al., 2017; Geibert et al., 2021; Song et al., 2023). For details and methods, we refer to Stein et al. (this paper).

Keyword(s):

Arctic Ocean; Eurasian Ice Sheet History; Late Pleistocene; Organic carbon (OC) burial

References:

Geibert, Walter; Matthiessen, Jens; Stimac, Ingrid; Wollenburg, Jutta Erika; Stein, Ruediger (2021): Glacial episodes of a freshwater Arctic Ocean covered by a thick ice shelf. Nature, https://doi.org/10.1038/s41586-021-03186-y

Hillaire-Marcel, Claude; Ghaleb, Bassam; de Vernal, Anne; Maccali, Jenny; Cuny, K; Jacobel, Allison W; Le Duc, Cynthia; McManus, Jerry F (2017): A new chronology of Late Quaternary sequences from the Central Arctic Ocean based on “Extinction Ages” of their excesses in 231Pa and 230Th. Geochemistry, Geophysics, Geosystems, 18(12), 4573-4585, https://doi.org/10.1002/2017GC007050

Song, Tengfei; Hillaire-Marcel, Claude; Liu, Yanguang; Ghaleb, Bassam; de Vernal, Anne (2023): Cycling and behavior of 230Th in the Arctic Ocean: Insights from sedimentary archives. Earth-Science Reviews, 244, 104514, https://doi.org/10.1016/j.earscirev.2023.104514

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:

German Research Foundation (DFG), grant/award no. STE 412/30: ArcOP-Pilot

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: 7.54 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: * Basis: * 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: * Basis: * Method/Device: Box corer (BC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Stein, Ruediger
2	DEPTH, sediment/rock	Depth sed	m	Stein, Ruediger		Geocode
3	AGE	Age	ka BP	Stein, Ruediger		Geocode
4	Thorium-232	232Th	dpm/g	Geibert, Walter	Isotope dilution, SF-ICP-MS
5	Thorium-232, standard deviation	232Th std dev	±	Geibert, Walter
6	Thorium-230	230Th	dpm/g	Geibert, Walter	Isotope dilution, SF-ICP-MS
7	Thorium-230, standard deviation	230Th std dev	±	Geibert, Walter
8	Thorium-230 excess	230Th xs	dpm/g	Geibert, Walter	Isotope dilution, SF-ICP-MS
9	Thorium-230 excess, standard deviation	230Th xs std dev	±	Geibert, Walter
10	Protactinium-231	231Pa	dpm/g	Geibert, Walter	Isotope dilution, SF-ICP-MS
11	Protactinium-231, standard deviation	231Pa std dev	±	Geibert, Walter
12	Protactinium-231 excess	231Pa xs	dpm/g	Geibert, Walter	Isotope dilution, SF-ICP-MS
13	Protactinium-231 excess, standard deviation	231Pa xs std dev	±	Geibert, Walter
14	Uranium-234	234U	dpm/g	Geibert, Walter	Isotope dilution, SF-ICP-MS	the uranium fractions for the depths 232, 262, 288, 292, 298, 302, 322 and 332 cm were lost during analysis and were calculated by linear interpolation from neighboring depth intervals.
15	Uranium-234, standard deviation	234U std dev	±	Geibert, Walter		the uranium fractions for the depths 232, 262, 288, 292, 298, 302, 322 and 332 cm were lost during analysis and were calculated by linear interpolation from neighboring depth intervals.
16	Uranium-238	238U	dpm/g	Geibert, Walter	Isotope dilution, SF-ICP-MS	the uranium fractions for the depths 232, 262, 288, 292, 298, 302, 322 and 332 cm were lost during analysis and were calculated by linear interpolation from neighboring depth intervals.
17	Uranium-238, standard deviation	238U std dev	±	Geibert, Walter		the uranium fractions for the depths 232, 262, 288, 292, 298, 302, 322 and 332 cm were lost during analysis and were calculated by linear interpolation from neighboring depth intervals.
18	Uranium-235	235U	dpm/g	Geibert, Walter	Isotope dilution, SF-ICP-MS	the uranium fractions for the depths 232, 262, 288, 292, 298, 302, 322 and 332 cm were lost during analysis and were calculated by linear interpolation from neighboring depth intervals.
19	Uranium-235, standard deviation	235U std dev	±	Geibert, Walter		the uranium fractions for the depths 232, 262, 288, 292, 298, 302, 322 and 332 cm were lost during analysis and were calculated by linear interpolation from neighboring depth intervals.
20	Uranium-234/Uranium-238 activity ratio	(234U/238U)		Geibert, Walter	Isotope dilution, SF-ICP-MS	the uranium fractions for the depths 232, 262, 288, 292, 298, 302, 322 and 332 cm were lost during analysis and were calculated by linear interpolation from neighboring depth intervals.
21	Uranium-234/Uranium-238 activity ratio, standard deviation	(234U/238U) std dev	±	Geibert, Walter		the uranium fractions for the depths 232, 262, 288, 292, 298, 302, 322 and 332 cm were lost during analysis and were calculated by linear interpolation from neighboring depth intervals.

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:

2193 data points

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