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Hoff, Ulrike; Rasmussen, Tine Lander; Stein, Ruediger; Ezat, Mohamed; Fahl, Kirsten (2016): Total organic carbon, delta13C, biomarker, diatom distributions in sediment core JM11-FI-19PC. PANGAEA,, Supplement to: Hoff, U et al. (2016): Sea ice and millennial-scale climate variability in the Nordic seas 90 ka to present. Nature Communications, 7, 10 pp,

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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; Fahl, Kirsten (2016): (Tab S3) Age determination of sediment core JM11-FI-19PC. PANGAEA,
Latitude: 62.832830 * Longitude: -3.867170
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 8.01 m
JM11-FI-19PC * Latitude: 62.832830 * Longitude: -3.867170 * Elevation: -1179.0 m * Recovery: 11.09 m * Location: Norwegian Sea * Campaign: JM11 * Basis: Jan Mayen * Method/Device: Piston corer (PC)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmHoff, UlrikeGeocode – Corrected depth
2AGEAgeka BPHoff, UlrikeGeocode – BP = 2k;Calc. Ages GICC05
3Susceptibility, volumekappa10-6 SIEzat, Mohamed
4Neogloboquadrina pachyderma sinistral, δ18ON. pachyderma s δ18O‰ PDBEzat, MohamedMass spectrometry
5Carbon, organic, totalTOC%Fahl, KirstenElement analyser CHN, LECO CNS 2000
6δ13Cδ13C‰ PDBMeyer, HannoMass spectrometry
72,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment massIP25/sedµg/gFahl, KirstenGas chromatography
82,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit mass total organic carbonIP25/TOCµg/gFahl, KirstenGas chromatography
924-Methylcholesta-5,22E-dien-3beta-ol per unit sediment massBrassicasterol/sedµg/gFahl, KirstenGas chromatography
1024-Methylcholesta-5,22E-dien-3beta-ol per unit mass total organic carbonBrassicasterol/TOCµg/gFahl, KirstenGas chromatography
11Phytoplankton biomarker Brassicasterol IP25 indexPBIP25Fahl, KirstenCalculated
124alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment massDinosterol/sedµg/gFahl, KirstenGas chromatography
134alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit mass total organic carbonDinosterol/TOCµg/gFahl, KirstenGas chromatography
14Phytoplankton biomarker Dinosterol IP25 indexPDIP25Fahl, KirstenCalculated
15Fragilariopsis oceanicaF. oceanica%Hoff, UlrikeCounting, diatoms
16Thalassiosira oestrupiiT. oestrupii%Hoff, UlrikeCounting, diatoms
17Accumulation rate, diatomsAcc rate diatom106 #/cm2/kaHoff, UlrikeCalculatedDiatom frustules
18Diatoms, total abundance per unit sediment massTDA/sed106 #/gHoff, UlrikeCalculatedDiatom frustules
19Sedimentation rateSed ratecm/kaHoff, UlrikeCalculated
3773 data points

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