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  • 2020-2024  (18)
  • 2020-2023  (2)
  • 2022  (17)
  • 2022  (17)
  • 2021  (3)
  • 2021  (3)
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Year
  • 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
    Location Call Number Limitation Availability
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    CITATION GEO-LEO
  • 2
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    Deglacial release of petrogenic and permafrost carbon from the Canadian Arctic impacting the carbon cycle (2022)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: The changes in atmospheric pCO2 provide evidence for the release of large amounts of ancient carbon during the last deglaciation. However, the sources and mechanisms that contributed to this process remain unresolved. Here, we present evidence for substantial ancient terrestrial carbon remobilization in the Canadian Arctic following the Laurentide Ice Sheet retreat. Glacial-retreat-induced physical erosion of bedrock has mobilized petrogenic carbon, as revealed by sedimentary records of radiocarbon dates and thermal maturity of organic carbon from the Canadian Beaufort Sea. Additionally, coastal erosion during the meltwater pulses 1a and 1b has remobilized pre-aged carbon from permafrost. Assuming extensive petrogenic organic carbon oxidation during the glacial retreat, a model-based assessment suggests that the combined processes have contributed 12 ppm to the deglacial CO2 rise. Our findings suggest potentially positive climate feedback of ice-sheet retreat by accelerating terrestrial organic carbon remobilization and subsequent oxidation during the glacial-interglacial transition.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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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
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 4
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    Deglacial release of petrogenic and permafrost carbon from the Canadian Arctic impacting the carbon cycle (2022)
    Springer Science and Business Media LLC
    In:  EPIC3Nature Communications, Springer Science and Business Media LLC, 13(1), pp. 7172-7172, ISSN: 2041-1723
    Details
    Publication Date: 2023-06-23
    Description: 〈jats:title〉Abstract〈/jats:title〉〈jats:p〉The changes in atmospheric 〈jats:italic〉p〈/jats:italic〉CO〈jats:sub〉2〈/jats:sub〉 provide evidence for the release of large amounts of ancient carbon during the last deglaciation. However, the sources and mechanisms that contributed to this process remain unresolved. Here, we present evidence for substantial ancient terrestrial carbon remobilization in the Canadian Arctic following the Laurentide Ice Sheet retreat. Glacial-retreat-induced physical erosion of bedrock has mobilized petrogenic carbon, as revealed by sedimentary records of radiocarbon dates and thermal maturity of organic carbon from the Canadian Beaufort Sea. Additionally, coastal erosion during the meltwater pulses 1a and 1b has remobilized pre-aged carbon from permafrost. Assuming extensive petrogenic organic carbon oxidation during the glacial retreat, a model-based assessment suggests that the combined processes have contributed 12 ppm to the deglacial CO〈jats:sub〉2〈/jats:sub〉 rise. Our findings suggest potentially positive climate feedback of ice-sheet retreat by accelerating terrestrial organic carbon remobilization and subsequent oxidation during the glacial-interglacial transition.〈/jats:p〉
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 5
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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
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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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
  • 7
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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
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Biomarker, bulk parameter, XRF data of sediment core MSM12/2-5-1 from the Labrador Sea (2022)
    PANGAEA
    Details
    Publication Date: 2024-02-05
    Description: The data originates from the gravity core MSM12/2-5-1 (57.538500, -48.738700, recovery 1494 cm, 3492 m water depth) taken during R/V Maria S. Merian cruise MSM12/2 in 2009 in the eastern Labrador Sea (Eirik Drift). The data should provide more precise information on the timing and duration of freshwater forcing, which may help to improve simulations for past and future changes in ocean circulation and climate. We have investigated the very well-dated and high-resolution sediment core from the Eirik Drift, representing an interval from the last deglaciation to Holocene, i.e., the last 19 ka. Four meltwater-related cold events have been identified by abrupt changes in sea surface characteristics, which are based on independent multiple biomarker proxies, including sea-ice proxy IP25 and phytoplankton biomarker IP25 index (PIP25) for sea ice cover, the alkenone unsaturation index for sea surface temperature (SST), and the percentage of tetra-unsaturated alkenones (%C37:4) for meltwater inflow, and X-ray fluorescence (XRF) scanning data. Furthermore, sortable silt mean size has been used to reflect changes in bottom current intensity. In conclusion, our study could improve our understanding of the impact of meltwater injection into subpolar regions on abrupt climate changes during the last glacial termination. Furthermore, the data support modelling results that higher frequency and amplitude of abrupt changes may occur during the transition states from background climates. We found that meltwater pulses following collapse of the Laurentide Ice Sheet and/or Greenland Ice Sheet might have triggered millennial-scale abrupt changes in surface freshening and sea ice concentrations in the Labrador Sea, as well as cooling atmospheric temperatures.
    Keywords: Alkenone; ArcTrain; IP25; Labrador Sea; Meltwater pulse; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sea ice; SST; sterols; XRF
    Type: Dataset
    Format: application/zip, 10 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Highly branched isoprenoid and sterol concentration and accumulation rates of sediment core MSM12/2-5-1 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 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, 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; AGE; Alkenone; ArcTrain; Calculated; DEPTH, sediment/rock; Gas chromatography - Mass spectrometry (GC-MS); GC; Gravity corer; IP25; Labrador Sea; Maria S. Merian; Meltwater pulse; MSM12/2; MSM12/2_647-1; MSM12/2-05-01; Phytoplankton biomarker Brassicasterol IP25 index; Phytoplankton biomarker C25 HBI (Z) triene IP25 index; Phytoplankton biomarker Dinosterol IP25 index; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sea ice; SST; sterols; XRF
    Type: Dataset
    Format: text/tab-separated-values, 1260 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Alkenone concentration, accumulation rates, and SSTs of sediment core MSM12/2-5-1 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: Accumulation rate, alkenones; AGE; Alkenone; Alkenone, C37:4; Alkenone, per unit mass total organic carbon; ArcTrain; Calculated; Calculated from UK'37 (Filippova et al., 2016); Calculated from UK'37 (Müller et al, 1998); Calculated from UK'37 (Rosell-Mele et al., 1995); Calculated from UK37 (Filippova et al., 2016); Calculated from UK37 (Müller et al, 1998); Calculated from UK37 (Rosell-Melé et al., 1995); DEPTH, sediment/rock; Gas chromatography; GC; Gravity corer; IP25; Labrador Sea; Maria S. Merian; Meltwater pulse; MSM12/2; MSM12/2_647-1; MSM12/2-05-01; Phytoplankton biomarker Alkenone IP25 index; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic; Sea ice; Sea surface temperature, annual mean; Sea surface temperature, summer; SST; sterols; XRF
    Type: Dataset
    Format: text/tab-separated-values, 1298 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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