Citation:

PANGAEA.989273

Name: Radiocarbon dates from Yermak Plateau sediment core KH21-234-34GC1
Published: 2026-01-30
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Arctic; Dinoflagellate; gene copy number; Magnetic susceptibility; Radiocarbon; Sea ice

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Published: 2026-01-30 • DOI registered: 2026-01-30

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Abstract:

Radiocarbon dates were determined by picking shells of Neogloboquadrina pachyderma at four depths from marine sediment core KH21-234-34GC collected from the Yermak Plateu (81.2199280 ˚N, 2.3710955˚E ) with a gravity corer at 1011m water depth during cruise KH21-234. Accelerator mass spectrometry (AMS) 14C dates from the radiocarbon lab at ETH Zurich, and calibrated ages were calculated used the functions BchronCalibrate:sampleAges and Bchronology:PredictAges from the statistical package BChron (version 4.7.7).

Keyword(s):

Arctic; Dinoflagellate; gene copy number; Magnetic susceptibility; Radiocarbon; Sea ice

Supplement to:

Mayers, Kyle M J; Vollmar, Nele Manon; Cordier, Tristan; Weiner, Agnes K M; Müller, Juliane; Larsen, Aud; De Schepper, Stijn (2026): First-year sea ice history in the Arctic Ocean inferred from ancient DNA of Polerella glacialis over the past 50,000 years. Earth and Planetary Science Letters, 678, 119809, https://doi.org/10.1016/j.epsl.2025.119809

Funding:

European Research Council (ERC), grant/award no. 101118519 : Into the Blue - Resolving past Arctic greenhouse climate (i2B)

Horizon 2020 (H2020), grant/award no. 818449 : Genetic information for Arctic sea ice study

Coverage:

Latitude: 81.219928 * Longitude: 2.371096

Date/Time Start: 2021-07-07T14:42:29 * Date/Time End: 2021-07-07T14:42:29

Minimum DEPTH, sediment/rock: 0.69 m * Maximum DEPTH, sediment/rock: 4.54 m

Event(s):

KH21-234-34GC * Latitude: 81.219928 * Longitude: 2.371096 * Date/Time: 2021-07-07T14:42:29 * Elevation: -1011.0 m * Recovery: 466 cm * Campaign: * Basis: * Method/Device: Gravity corer (GC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Site	Site		Mayers, Kyle M J
2	DEPTH, sediment/rock	Depth sed	m	Mayers, Kyle M J		Geocode
3	Age, dated	Age dated	ka	Mayers, Kyle M J	Age, 14C AMS	14C AMS
4	Age, dated, error	Age dated e	±	Mayers, Kyle M J	Age, 14C AMS
5	Laboratory code/label	Lab label		Mayers, Kyle M J		Sample ID
6	Reference/source	Reference		Mayers, Kyle M J
7	Calibration	Calibration		Mayers, Kyle M J		Calibration curve
8	Calendar age, minimum/young	Cal age min	ka BP	Mayers, Kyle M J	Age, 14C calibrated	2.5%
9	Calendar age	Cal age	ka BP	Mayers, Kyle M J	Age, 14C calibrated
10	Calendar age, maximum/old	Cal age max	ka BP	Mayers, Kyle M J	Age, 14C calibrated	97.5%

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

36 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Site	2 Depth sed [m]	3 Age dated [ka]	4 Age dated e [±]	5 Lab label	6 Reference	7 Calibration	8 Cal age min [ka BP]	9 Cal age [ka BP]	10 Cal age max [ka BP]
KH21-234	0.69	4.410	0.062	118423.1.1	this study	marine20	4.145	4.371	4.601
KH21-234	1.99	10.252	0.098	118424.1.1	this study	marine20	10.888	11.219	11.568
KH21-234	3.29	17.479	0.149	118425.1.1	this study	marine20	19.767	20.202	20.603
KH21-234	4.54	55.500	10.947	118426.1.1	this study	None (extrapolated age)	37.850	48.889	54.717