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  • 1
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    Holocene variability in sea‐ice conditions in the eastern Baffin Bay‐Labrador Sea – A north–south biomarker transect study (2022)
    Saini, Jeetendra ; Stein, Ruediger ; Fahl, Kirsten ; [et al.]
    Details
    Publication Date: 2022-10-05
    Description: Reconstructions of sea‐surface conditions during the Holocene were achieved using three sediment cores from northeastern Baffin Bay (GeoB19948‐3 and GeoB19927‐3) and the Labrador Sea (GeoB19905‐1) along a north–south transect based on sea‐ice IP25 and open‐water phytoplankton biomarkers (brassicasterol, dinosterol and HBI III). In Baffin Bay, sea‐surface conditions in the Early Holocene were characterized by extended (early) spring sea ice cover (SIC) prior to 7.6 ka BP. The conditions in the NE Labrador Sea, however, remained predominantly ice‐free in spring/autumn due to the enhanced influx of Atlantic Water (West Greenland Current, WGC) from 11.5 until ~9.1 ka BP, succeeded by a period of continued (spring–autumn) ice‐free conditions between 9.1 and 7.6 ka BP corresponding to the onset of Holocene Thermal Maximum (HTM)‐like conditions. A transition towards reoccurring ice‐edge and significantly reduced SIC conditions in Baffin Bay is evident in the Middle Holocene (~7.6–3 ka BP) probably caused by the variations in the WGC influence associated with the ice melting and can be characterized as HTM‐like conditions. These HTM‐like conditions are predominantly recorded in the NE Labrador Sea area shown by (spring–autumn) ice‐free conditions from 5.9–3 ka BP. In the Late Holocene (last ~3 ka), our combined proxy records from eastern Baffin Bay indicate low in‐situ ice algae production; however, enhanced multi‐year (drifted) sea ice in this area was possibly attributed to the increased influx of Polar Water mass influx and may correlate with the Neoglacial cooling. The conditions in the NE Labrador Sea during the last 3 ka, however, continued to remain (spring–autumn) ice‐free. Our data from the Baffin Bay–Labrador Sea transect suggest a dominant influence of meltwater influx on sea‐ice formation throughout the Holocene, in contrast to sea‐ice records from the Fram Strait area, which seem to follow predominantly the summer insolation trend.
    Description: image
    Description: Deutsche Forschungsgemeinschaft (DFG) http://dx.doi.org/10.13039/501100001659
    Keywords: ddc:551.46
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    The biomarker and bulk parameters of two sediment cores along Baffin Bay-Labrador Sea north-south transect during the Holocene (2021)
    PANGAEA
    Details
    Publication Date: 2024-01-03
    Description: Holocene sea ice and palaeoenvironmental conditions were reconstructed using three sediment cores from northeastern Baffin Bay (GeoB19948-3 and GeoB19927-3) and the Labrador Sea (GeoB19905-1) along a north-south transect based on sea ice IP25 and open-water phytoplankton biomarkers (brassicasterol, dinosterol and HBI III). In Baffin Bay, sea-surface conditions in the Early Holocene were characterized by extended (early) spring sea ice cover (SIC) prior to 7.6 ka BP. The conditions in the NE Labrador Sea, however, remained predominantly ice-free in spring/autumn due to the enhanced influx of Atlantic Water (i.e., WGC; West Greenland Current) from 11.5 to ~9.1 ka BP, succeeded by a period of continued (spring-autumn) ice-free conditions from 9.1 to 7.6 ka BP corresponding to the onset of Holocene Thermal Maximum (HTM)-like conditions. A transition towards reoccurring ice-edge and significantly reduced SIC conditions in Baffin Bay is evident in the Mid Holocene (~7.6-3 ka BP) probably caused by the variations in the WGC influence associated with the ice melting and can be characterized as HTM-like conditions. These HTM-like conditions are predominantly recorded in the NE Labrador Sea area shown by (spring-autumn) ice-free conditions from 5.9-3 ka BP. In the Late Holocene (last ~3 ka), our combined proxy records from eastern Baffin Bay indicate low in-situ ice-algae production, however, enhanced multi-year (drifted) sea ice in this area was possibly attributed to the increased influx of Polar Water mass influx and may correlate with the Neoglacial cooling. The conditions in the NE Labrador Sea during the last 3 ka, however, continued to remain (spring-autumn) ice-free with decreased biological carbonate production probably linked to decreased WGC strength and/or increased Arctic Water influx, coinciding with the Neoglacial cooling.
    Keywords: ArcTrain; AWI_Paleo; Baffin Bay; HBI III; Holocene; IP25; Labrador Sea; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; PIP25 index; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sea ice
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 3
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    Biomarker and bulk parameters of sediment core GeoB19948-3 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; Accumulation rate, (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene; Accumulation rate, 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane; Accumulation rate, 24-Methylcholesta-5,22E-dien-3beta-ol; Accumulation rate, 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; Accumulation rate, calcium carbonate; Accumulation rate, mass; Accumulation rate, total organic carbon; AGE; ArcTrain; AWI_Paleo; Baffin Bay; Calcium carbonate; Calculated; Carbon, organic, total; DEPTH, sediment/rock; Gas chromatography - Mass spectrometry (GC-MS); GC; GeoB19948-3; Gravity corer; HBI III; Holocene; IP25; Labrador Sea; Maria S. Merian; MSM44; MSM44_374-3; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Phytoplankton biomarker Brassicasterol IP25 index; Phytoplankton biomarker C25 HBI (Z) triene IP25 index; Phytoplankton biomarker Dinosterol IP25 index; PIP25 index; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sea ice; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 819 data points
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    DATA PANGAEA
  • 4
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    Biomarker and bulk parameters of sediment core GeoB19905-1 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; Accumulation rate, 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane; Accumulation rate, 24-Methylcholesta-5,22E-dien-3beta-ol; Accumulation rate, 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; Accumulation rate, calcium carbonate; Accumulation rate, mass; Accumulation rate, total organic carbon; AGE; ArcTrain; AWI_Paleo; Baffin Bay; Calcium carbonate; Calculated; Carbon, organic, total; Davis Strait; DEPTH, sediment/rock; Gas chromatography - Mass spectrometry (GC-MS); GC; GeoB19905-1; Gravity corer; HBI III; Holocene; IP25; Labrador Sea; Maria S. Merian; MSM44; MSM44_331-1; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; PIP25 index; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sea ice; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 1554 data points
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    DATA PANGAEA
  • 5
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    Detrital radiogenic isotope records of Sr and Nd from sediment cores MSM44_353-3 (GeoB19927-3) and MSM44_372-4 (GeoB19946-4), Northeastern Baffin Bay (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-18
    Description: This dataset includes downcore radiogenic isotope records of Sr and Nd of the siliciclastic detrital sediment fraction of samples from gravity cores MSM44_353-3 (GeoB19927-3) and MSM44_372-4 (GeoB19946-4), collected during cruise MSM44 in the eastern Baffin Bay in summer 2015. The Sr and Nd isotope ratios were measured with the purpose of reconstructing past provenances of the sedimentary material delivered onto the West Greenland shelf. Sample preparation and measurements of radiogenic isotope ratios were performed in the Isotope Geochemistry Laboratory at MARUM—Centre for Marine Environmental Sciences, University of Bremen, Germany. All samples were washed, decarbonised and separated from possible iron-manganese coatings following a procedure by Gutjahr et al. (2007). Sr and Nd were extracted through column separation using TrisKem Sr.specTM resin (method modified after Deniel & Pin, 2001), and TRU.specTM resin and LN.specTM (method by Pin et al., 1994), respectively. Isotopic ratios were analysed with a Thermo Fisher Scientific TritonTM Plus multicollector thermal ionization mass spectrometer (TIMS). The 143Nd/144Nd ratio is reported in the εNd notation relative to the Chondritic Uniform Reservoir (CHUR) value (143Nd/144Nd = 0.512638; Jacobsen and Wasserburg, 1980).
    Keywords: ArcTrain; Baffin Bay; Center for Marine Environmental Sciences; DEPTH, sediment/rock; Event label; GC; GeoB19927-3; GeoB19946-4; Gravity corer; Holocene; Maria S. Merian; MARUM; MSM44; MSM44_353-3; MSM44_372-4; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, standard deviation; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Provenance; provenance study; Radiogenic isotopes; Sample code/label; Sr-Nd isotopes; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard deviation; ε-Neodymium
    Type: Dataset
    Format: text/tab-separated-values, 216 data points
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    DATA PANGAEA
  • 6
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    Holocene variability in sea-ice conditions in the eastern Baffin Bay-Labrador Sea – A north–south biomarker transect study (2022)
    WILEY-BLACKWELL PUBLISHING
    In:  EPIC3Boreas, WILEY-BLACKWELL PUBLISHING, pp. 1-20, ISSN: 0300-9483
    Details
    Publication Date: 2022-02-15
    Description: Reconstructions of sea-surface conditions during the Holocene were achieved using three sediment cores from northeastern Baffin Bay (GeoB19948-3 and GeoB19927-3) and the Labrador Sea (GeoB19905-1) along a north– south transect based on sea-ice IP25 and open-water phytoplankton biomarkers (brassicasterol, dinosterol and HBI III). In Baffin Bay, sea-surface conditions in the Early Holocene were characterized by extended (early) spring sea ice cover (SIC) prior to 7.6 ka BP. The conditions in the NE Labrador Sea, however, remained predominantly ice-free in spring/autumn due to the enhanced influx of Atlantic Water (West Greenland Current,WGC) from11.5 until ~9.1 ka BP, succeeded by a period of continued (spring–autumn) ice-free conditions between 9.1 and 7.6 ka BP corresponding to the onset of Holocene Thermal Maximum (HTM)-like conditions. A transition towards reoccurring ice-edge and significantly reduced SIC conditions in Baffin Bay is evident in the Middle Holocene (~7.6–3 ka BP) probably caused by the variations in the WGC influence associated with the ice melting and can be characterized as HTM-like conditions. These HTM-like conditions are predominantly recorded in the NE Labrador Sea area shown by (spring– autumn) ice-free conditions from 5.9–3 ka BP. In the Late Holocene (last ~3 ka), our combined proxy records from eastern Baffin Bay indicate low in-situ ice algae production; however, enhanced multi-year (drifted) sea ice in this area was possibly attributed to the increased influx of Polar Water mass influx and may correlate with the Neoglacial cooling. The conditions in the NE Labrador Sea during the last 3 ka, however, continued to remain (spring–autumn) ice-free. Our data from the Baffin Bay–Labrador Sea transect suggest a dominant influence of meltwater influx on sea ice formation throughout the Holocene, in contrast to sea-ice records from the Fram Strait area,which seem to follow predominantly the summer insolation trend.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
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