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Saini, Jeetendra; Stein, Ruediger; Fahl, Kirsten; Weiser, Jens; Hebbeln, Dierk; Hillaire-Marcel, Claude; de Vernal, Anne (2020): Biomarker record of sediment core MSM44_353-3. PANGAEA,

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Arctic sea ice is a critical component of the climate system, known to influence ocean circulation, earth's albedo, and ocean-atmosphere heat and gas exchange. Current developments in the use of IP25 (a sea ice proxy with 25 carbon atoms only synthesized by Arctic sea ice diatoms) have proven it to be a suitable proxy for palaeo-sea ice reconstructions over hundreds of thousands to even million years timescales. In the NE-Baffin Bay, off NW-Greenland, Melville Bugt is a climate-sensitive region characterized by strong seasonal sea ice variability and strong melt-water discharge from the Greenland Ice Sheet (GIS). Here, we present a centennial-scale resolution Holocene sea ice record, based on IP25 and open-water phytoplankton biomarkers (brassicasterol, dinosterol and HBI III) using core GeoB19927-3 (73°35.26' N, 58°05.66' W). Seasonal to ice-edge conditions near the core site is documented for most of the Holocene period with some significant variability. A cold interval, in the lower-most part, characterized by extensive sea ice cover and very low local productivity is succeeded by an interval (~9.4-8.5 ka BP)) with reduced sea ice cover, enhanced GIS spring melting, and strong influence of the West Greenland Current (WGC) in the earliest part of the record. From ~8.5 untill ~7.8 ka BP, a cooling event is recorded by ice algae and phytoplankton biomarkers. They indicate an enhanced sea ice cover, possibly related to the opening of Nares Strait, which may have led to an increased influx of Polar Water into NE-Baffin Bay. The interval between ~7.8 and ~3.0 ka BP is characterized by generally reduced sea ice cover with millennial-scale variability of the (late winter/early spring) ice-edge limit, increased open-water conditions (polynya-type), and a dominant WGC carrying warm waters at least as far as the Melville Bugt area. During the last ~3.0 ka BP, our biomarker records do not reflect the late Holocene 'Neoglacial cooling' observed elsewhere in the Northern Hemisphere, possibly due to the persistent influence of the WGC and interactions with the adjacent fjords. Peaks in HBI III at about ~2.1 and ~1.3 ka BP, interpreted as persistent ice-edge situations might, correlate with the Roman Warm Period (RWP) and Medieval Climate Anomaly (MCA), respectively, in-phase with the North Atlantic Oscillation (NAO) mode. When integrated with marine and terrestrial records from other circum-Baffin Bay areas (Disko Bay, the Canadian Arctic, the Labrador Sea), the Melville Bugt biomarker records point to close ties with high Arctic and Northern Hemispheric climate conditions, driven by solar and oceanic circulation forcings.
Baffin Bay; brassicasterol; HBI III; Holocene; IP25; PIP25 index; Sea ice
Supplement to:
Saini, Jeetendra; Stein, Ruediger; Fahl, Kirsten; Weiser, Jens; Hebbeln, Dierk; Hillaire-Marcel, Claude; de Vernal, Anne (2020): Holocene variability in sea ice and primary productivity in the northeastern Baffin Bay. arktos - The Journal of Arctic Geosciences,
Latitude: 73.587670 * Longitude: -58.094330
Date/Time Start: 2015-07-08T18:20:00 * Date/Time End: 2015-07-08T18:20:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 11.45 m
MSM44_353-3 (GeoB19927-3) * Latitude: 73.587670 * Longitude: -58.094330 * Date/Time: 2015-07-08T18:20:00 * Elevation: -932.0 m * Recovery: 1147 cm * Location: Baffin Bay * Campaign: MSM44 * Basis: Maria S. Merian * Method/Device: Gravity corer (GC)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmSaini, JeetendraGeocode
2AGEAgeka BPSaini, JeetendraGeocode
3Carbon, organic, totalTOC%Saini, Jeetendra
4Size fraction 2.000-0.063 mm, sand2000-63 µm%Saini, JeetendraGrain size, sievingvol %
5Sedimentation rateSed ratecm/kaSaini, JeetendraCalculated
6Accumulation rate, sediment, meanMARg/cm2/kaSaini, JeetendraCalculated
7Accumulation rate, total organic carbonAcc rate TOCg/cm2/kaSaini, Jeetendra
82,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment massIP25/sedµg/gSaini, JeetendraGas chromatography - Mass spectrometry (GC-MS)
92,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit mass total organic carbonIP25/TOCµg/gSaini, JeetendraGas chromatography - Mass spectrometry (GC-MS)
10Accumulation rate, 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecaneAcc rate IP25µg/cm2/kaSaini, JeetendraCalculated
1124-Methylcholesta-5,22E-dien-3beta-ol per unit sediment massBrassicasterol/sedµg/gSaini, JeetendraGas chromatography - Mass spectrometry (GC-MS)
1224-Methylcholesta-5,22E-dien-3beta-ol per unit mass total organic carbonBrassicasterol/TOCµg/gSaini, JeetendraGas chromatography - Mass spectrometry (GC-MS)
13Accumulation rate, 24-Methylcholesta-5,22E-dien-3beta-olAcc rate brassicasterolµg/cm2/kaSaini, JeetendraCalculated
144alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment massDinosterol/sedµg/gSaini, JeetendraGas chromatography - Mass spectrometry (GC-MS)
154alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit mass total organic carbonDinosterol/TOCµg/gSaini, JeetendraGas chromatography - Mass spectrometry (GC-MS)
16Accumulation rate, 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-olAcc rate dinosterolµg/cm2/kaSaini, JeetendraCalculated
17(9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment massC25 HBI (Z) triene/sedµg/gSaini, JeetendraGas chromatography - Mass spectrometry (GC-MS)
18(9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass organic carbonC25 HBI (Z) triene/TOCµg/gSaini, JeetendraGas chromatography - Mass spectrometry (GC-MS)
19Accumulation rate, (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-eneAcc rate C25 HBI (Z) trieneµg/cm2/kaSaini, JeetendraCalculated
20Phytoplankton biomarker HBI TR25 indexHBI TR25Saini, JeetendraCalculated
21Phytoplankton biomarker Brassicasterol IP25 indexPBIP25Saini, JeetendraCalculated
22Phytoplankton biomarker Dinosterol IP25 indexPDIP25Saini, JeetendraCalculated
23Phytoplankton biomarker C25 HBI (Z) triene IP25 indexP(III)IP25Saini, JeetendraCalculated
2385 data points

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