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Hörner, Tanja; Stein, Ruediger; Fahl, Kirsten (2017): Biomarker analyses on sediment core BP00-07/07 from the southern Kara Sea (Arctic Ocean). PANGAEA, https://doi.org/10.1594/PANGAEA.871593, Supplement to: Hörner, T et al. (2017): Evidence for Holocene centennial variability in sea ice cover based on IP25 biomarker reconstruction in the southern Kara Sea (Arctic Ocean). Geo-Marine Letters, 37(5), 515-526, https://doi.org/10.1007/s00367-017-0501-y

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Abstract:
The Holocene is characterized by the late Holocene cooling trend as well as by internal short-term centennial fluctuations. As Arctic sea ice acts as a significant component (amplifier) within the climate system, investigating its past long- and short-term variability and controlling processes is beneficial for climate future predictions. This study presents the first biomarker-based (IP25 and PIP25) sea ice reconstruction from the Kara Sea (Core BP00-07/07), covering the last 8 ka. These biomarker proxies reflect conspicuous short-term sea ice variability during the last 6.5 ka that is identified unprecedentedly in the source region of Arctic sea ice by means of a direct sea ice indicator. Prominent peaks of extended sea ice cover occurred at ~3, ~2, ~1.3 and ~0.3 ka Spectral analysis of the IP25 record revealed ~400- and ~950-year cycles. These periodicities may be related to the Arctic/North Atlantic Oscillation (AO/NAO), but probably also to internal climate system fluctuations. This demonstrates that sea ice belongs to a complex system that more likely depends on multiple internal forcing.
Coverage:
Latitude: 74.657600 * Longitude: 81.141100
Date/Time Start: 2000-09-07T06:22:00 * Date/Time End: 2000-09-07T06:22:00
Minimum DEPTH, sediment/rock: 0.105 m * Maximum DEPTH, sediment/rock: 7.005 m
Event(s):
BP00-07/07 * Latitude: 74.657600 * Longitude: 81.141100 * Date/Time: 2000-09-07T06:22:00 * Elevation: -38.0 m * Recovery: 7.23 m * Location: Kara Sea * Campaign: BP00 * Basis: Akademik Boris Petrov * Device: Gravity corer (GC) * Comment: gravity corer 8 m
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmFahl, KirstenGeocode
2Carbon, organic, totalTOC%Fahl, Kirsten
32,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment massIP25/sedµg/gFahl, KirstenElement analyser CHN, LECO CNS 2000
42,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit mass total organic carbonIP25/TOCµg/gFahl, KirstenElement analyser CHN, LECO CNS 2000
524-Methylcholesta-5,22E-dien-3beta-ol per unit sediment massBrassicasterol/sedµg/gFahl, KirstenGas chromatography - Mass spectrometry (GC-MS)
624-Methylcholesta-5,22E-dien-3beta-ol per unit mass total organic carbonBrassicasterol/TOCµg/gFahl, KirstenGas chromatography - Mass spectrometry (GC-MS)
724-Methylcholest-5-en-3beta-ol per unit sediment massCampesterol/sedµg/gFahl, KirstenGas chromatography - Mass spectrometry (GC-MS)
824-Methylcholest-5-en-3beta-ol per unit mass total organic carbonCampesterol/TOCµg/gFahl, KirstenGas chromatography - Mass spectrometry (GC-MS)
924-Ethylcholest-5-en-3beta-ol per unit sediment massbeta-Sitosterol/sedµg/gFahl, KirstenGas chromatography - Mass spectrometry (GC-MS)
1024-Ethylcholest-5-en-3beta-ol per unit mass total organic carbonbeta-Sitosterol/TOCµg/gFahl, KirstenGas chromatography - Mass spectrometry (GC-MS)
114alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment massDinosterol/sedµg/gFahl, KirstenGas chromatography - Mass spectrometry (GC-MS)
124alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit mass total organic carbonDinosterol/TOCµg/gFahl, KirstenGas chromatography - Mass spectrometry (GC-MS)
Size:
891 data points

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