Citation:

ncomms12247

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Abstract:

In the light of rapidly diminishing sea ice cover in the Arctic during the present atmospheric warming, it is imperative to study the distribution of sea ice in the past in relation to rapid climate change. Here we focus on glacial millennial scale climatic events (Dansgaard/Oeschger events) using the new sea ice proxy IP25 in combination with phytoplankton proxy data and quantification of diatom species in a record from the SE Norwegian Sea. We demonstrate that expansion and retreat of sea ice varied consistently in pace with the rapid climate changes 90 ka to present, and with this present the first IP25 sea ice proxy record resolving the D/O cyclicity going back in time into Marine Isotope Stage 5a. Sea ice retreated abruptly at the start of warm interstadials, but spread rapidly during the cooling phase of the interstadials and became near-perennial and perennial during cold stadials and Heinrich events, respectively. Low salinity surface water and the sea ice edge spread to the Greenland-Scotland Ridge, and during the largest Heinrich events, probably far into the Atlantic Ocean.

Related to:

Hoff, Ulrike; Rasmussen, Tine Lander; Stein, Ruediger; Ezat, Mohamed M; Fahl, Kirsten (2016): (Tab S3) Age determination of sediment core JM11-FI-19PC. PANGAEA, https://doi.org/10.1594/PANGAEA.863447

Coverage:

Latitude: 62.832830 * Longitude: -3.867170

Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 8.01 m

Event(s):

JM11-FI-19PC * Latitude: 62.832830 * Longitude: -3.867170 * Elevation: -1179.0 m * Recovery: 11.09 m * Location: Norwegian Sea * Campaign: * Basis: Jan Mayen * Method/Device: Piston corer (PC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Hoff, Ulrike		Geocode – Corrected depth
2	AGE	Age	ka BP	Hoff, Ulrike		Geocode – BP = 2k;Calc. Ages GICC05
3	Magnetic susceptibility, volume	kappa	10^-6 SI	Ezat, Mohamed M
4	Neogloboquadrina pachyderma sinistral, δ18O	N. pachyderma s δ18O	‰ PDB	Ezat, Mohamed M	Mass spectrometry
5	Carbon, organic, total	TOC	%	Fahl, Kirsten	Element analyser CHN, LECO CNS 2000
6	δ13C	δ13C	‰ PDB	Meyer, Hanno	Mass spectrometry
7	2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass	IP25/sed	µg/g	Fahl, Kirsten	Gas chromatography
8	2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon	IP25/TOC	µg/g	Fahl, Kirsten	Gas chromatography
9	24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass	Brassicasterol/sed	µg/g	Fahl, Kirsten	Gas chromatography
10	24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon	Brassicasterol/TOC	µg/g	Fahl, Kirsten	Gas chromatography
11	Phytoplankton biomarker Brassicasterol IP25 index	PBIP25		Fahl, Kirsten	Calculated
12	4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass	Dinosterol/sed	µg/g	Fahl, Kirsten	Gas chromatography
13	4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon	Dinosterol/TOC	µg/g	Fahl, Kirsten	Gas chromatography
14	Phytoplankton biomarker Dinosterol IP25 index	PDIP25		Fahl, Kirsten	Calculated
15	Fragilariopsis oceanica	F. oceanica	%	Hoff, Ulrike	Counting, diatoms
16	Thalassiosira oestrupii	T. oestrupii	%	Hoff, Ulrike	Counting, diatoms
17	Accumulation rate, diatoms	Acc rate diatom	10⁶ #/cm²/ka	Hoff, Ulrike	Calculated	Diatom frustules
18	Diatoms, total, per unit sediment mass	TDA/sed	10⁶ #/g	Hoff, Ulrike	Calculated	Diatom frustules
19	Sedimentation rate	SR	cm/ka	Hoff, Ulrike	Calculated

License:

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

Size:

3773 data points

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