Citation:

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.

Project(s):

Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo)

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: * Basis: Akademik Boris Petrov * Method/Device: Gravity corer (GC) * Comment: gravity corer 8 m

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Fahl, Kirsten		Geocode
2	Carbon, organic, total	TOC	%	Fahl, Kirsten
3	2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass	IP25/sed	µg/g	Fahl, Kirsten	Element analyser CHN, LECO CNS 2000
4	2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon	IP25/TOC	µg/g	Fahl, Kirsten	Element analyser CHN, LECO CNS 2000
5	24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass	Brassicasterol/sed	µg/g	Fahl, Kirsten	Gas chromatography - Mass spectrometry (GC-MS)
6	24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon	Brassicasterol/TOC	µg/g	Fahl, Kirsten	Gas chromatography - Mass spectrometry (GC-MS)
7	24-Methylcholest-5-en-3beta-ol per unit sediment mass	Campesterol/sed	µg/g	Fahl, Kirsten	Gas chromatography - Mass spectrometry (GC-MS)
8	24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon	Campesterol/TOC	µg/g	Fahl, Kirsten	Gas chromatography - Mass spectrometry (GC-MS)
9	24-Ethylcholest-5-en-3beta-ol per unit sediment mass	b-Sitosterol/sed	µg/g	Fahl, Kirsten	Gas chromatography - Mass spectrometry (GC-MS)
10	24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon	b-Sitosterol/TOC	µg/g	Fahl, Kirsten	Gas chromatography - Mass spectrometry (GC-MS)
11	4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass	Dinosterol/sed	µg/g	Fahl, Kirsten	Gas chromatography - Mass spectrometry (GC-MS)
12	4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon	Dinosterol/TOC	µg/g	Fahl, Kirsten	Gas chromatography - Mass spectrometry (GC-MS)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

891 data points

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