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  • 1
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    High-resolution organic geochemical bulk parameter and biomarker records in sediment core PS100/270-1 from off eastern North Greenland (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-09
    Description: The Northeast Greenland continental shelf became one of the tipping elements in our climate system. Ongoing mass loss of the Greenland Ice Sheet, intensive sea-ice loss, the influence of warm, recirculating Atlantic Water towards the inner shelf, intensive bottom-melting at the underside of local marine-terminating outlet glaciers, glacier retreat and ice-sheet disintegration plays a fundamental role in terms of ongoing anthropogenic warming. Marine sediment Core PS100/270 was recovered aboard the RV Polarstern cruise PS100 in 2016 directly in front of 79NG on the inner NEG continental shelf (79°29.83'N, 18°8.40'W) in a water depth of 424 m. Chronology of the 9.51 m long Core PS100/270 is based on 13 AMS 14C ages, measured on benthic foraminifera. Sediment samples of Core PS100/270 were investigated to analyse microfossil assemblages, biomarker and bulk parameter proxy data. Additionally, the lithology, x-ray radiographs and geophysical properties (wet bulk density and magnetic susceptibility) were considered to perform a direct comparison with other records nearby e.g. PS2623. Four distinct lithofacies units were identified within this sedimentary record and are based on the, x-ray, lithology and biomarker data: stiff, overconsolidated diamiction; an indistinct/irregular laminated silty clay; a laminated silty clay and silty clay. Gravity Core PS100/270 was selected and studied in detail to reconstruct past sea-ice formation and ice-sheet dynamics, terrigenous input, primary productivity and the influence of warm, recirculating Atlantic Water on the shelf during the late Weichselian deglacial to late Holocene. The new high-resolution records presented here from the Northeast Greenland continental shelf provide helpful information about the pace of small- and large-scale climate variations, form the basis to improve future climate predictions and might serve as suitable analogue to ongoing anthropogenic warming by covering warmer periods in the past e.g. early Holocene Thermal Maximum.
    Keywords: 79°Glacier; Atlantic Water; Ice Sheet; Northeast Greenland; Sea ice
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Bulk parameters determined in sediment core PS100/270-1 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-09
    Keywords: 79°Glacier; Accumulation rate, calcium carbonate; Accumulation rate, total organic carbon; AGE; ARK-XXX/2, GN05; Atlantic Water; Calcium carbonate; Carbon, inorganic, total; Carbon, organic, total; Carbon, total; DEPTH, sediment/rock; GC; Gravity corer; Ice Sheet; Northeast Greenland; North Greenland Sea; Polarstern; PS100; PS100/270-1; Sea ice; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 1004 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Foraminifera record in sediment core PS100/270-1 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-09
    Keywords: 79°Glacier; Accumulation rate, Cassidulina neoteretis; Accumulation rate, Cassidulina reniforme; Accumulation rate, mass; AGE; ARK-XXX/2, GN05; Atlantic Water; Cassidulina neoteretis; Cassidulina reniforme; DEPTH, sediment/rock; Foraminifera, benthic; Foraminifera, benthic, flux; Foraminifera, planktic; Foraminifera, planktic, flux; GC; Gravity corer; Ice Sheet; Northeast Greenland; North Greenland Sea; Polarstern; PS100; PS100/270-1; Sea ice
    Type: Dataset
    Format: text/tab-separated-values, 344 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    IP25 and highly branched isoprenoids in sediment core PS100/270-1 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-09
    Keywords: (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit mass total organic carbon; (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene per unit sediment mass; (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; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene 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; 79°Glacier; Accumulation rate, (9E)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene; Accumulation rate, (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene; Accumulation rate, 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene; Accumulation rate, 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane; AGE; ARK-XXX/2, GN05; Atlantic Water; DEPTH, sediment/rock; GC; Gravity corer; Ice Sheet; Northeast Greenland; North Greenland Sea; Polarstern; PS100; PS100/270-1; Sea ice
    Type: Dataset
    Format: text/tab-separated-values, 1674 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Sterols in sediment core PS100/270-1 (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Keywords: 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Ethylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol 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; 79°Glacier; Accumulation rate, 24-Ethylcholest-5-en-3beta-ol; Accumulation rate, 24-Methylcholest-5-en-3beta-ol; Accumulation rate, 24-Methylcholesta-5,22E-dien-3beta-ol; Accumulation rate, 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; AGE; ARK-XXX/2, GN05; Atlantic Water; DEPTH, sediment/rock; GC; Gravity corer; Ice Sheet; Northeast Greenland; North Greenland Sea; Polarstern; PS100; PS100/270-1; Sea ice
    Type: Dataset
    Format: text/tab-separated-values, 1777 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Holocene Interactions Between Glacier Retreat, Sea Ice Formation, and Atlantic Water Advection at the Inner Northeast Greenland Continental Shelf (2020)
    In:  EPIC3Paleoceanography and Paleoclimatology, 35(11), pp. 1-25, ISSN: 2572-4517
    Details
    Publication Date: 2020-11-16
    Description: During the past four decades significant decrease in Arctic sea ice and a dramatic ice mass loss of the Greenland Ice Sheet (GIS) has been coincident with global warming and an increase in atmospheric CO2. In Northeast Greenland significant mass loss from the outlet glaciers Nioghalvfjerdsbræ (79NG) and Zachariæ Isstrøm (ZI) and intensive seasonal breakup of the local Norske Øer Ice Barrier (NØIB) have also been observed since 2000. In order to better understand the processes driving these modern changes, studies of paleoclimate records are important and of major societal relevance. A multiproxy study including organic‐biogeochemical and micropaleontological proxies was carried out on a marine sediment core recovered directly in front of 79NG. Data from Core PS100/270 evidenced a strong inflow of warm recirculating Atlantic Water across the Northeast Greenland shelf from the early Holocene between ~10 and 7.5 ka. An overall high in phytoplankton productivity occurred within a stable sea ice margin regime, accompanied by 79NG retreat most probably triggered by peak solar insolation and changes in the local ocean circulation. Enhanced basal melt of the underside of 79NG at ~7.5 ka then led to the total disintegration of the ice shelf. The released freshwater would have driven water column stratification and promoted the formation of the local landfast ice barrier, which is shown by lowered biomarker values and foraminifera abundances toward the end of the early Holocene. Near perennial sea ice conditions with short summers and 79NG retreat to the inner fjord then prevailed from ~7.5 to ~0.8 ka.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 7
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    Holocene Interactions Between Glacier Retreat, Sea Ice Formation, and Atlantic Water Advection at the Inner Northeast Greenland Continental Shelf (2021)
    Details
    Publication Date: 2021-07-04
    Description: During the past four decades significant decrease in Arctic sea ice and a dramatic ice mass loss of the Greenland Ice Sheet (GIS) has been coincident with global warming and an increase in atmospheric CO2. In Northeast Greenland significant mass loss from the outlet glaciers Nioghalvfjerdsbræ (79NG) and Zachariæ Isstrøm (ZI) and intensive seasonal breakup of the local Norske Øer Ice Barrier (NØIB) have also been observed since 2000. In order to better understand the processes driving these modern changes, studies of paleoclimate records are important and of major societal relevance. A multiproxy study including organic‐biogeochemical and micropaleontological proxies was carried out on a marine sediment core recovered directly in front of 79NG. Data from Core PS100/270 evidenced a strong inflow of warm recirculating Atlantic Water across the Northeast Greenland shelf from the early Holocene between ~10 and 7.5 ka. An overall high in phytoplankton productivity occurred within a stable sea ice margin regime, accompanied by 79NG retreat most probably triggered by peak solar insolation and changes in the local ocean circulation. Enhanced basal melt of the underside of 79NG at ~7.5 ka then led to the total disintegration of the ice shelf. The released freshwater would have driven water column stratification and promoted the formation of the local landfast ice barrier, which is shown by lowered biomarker values and foraminifera abundances toward the end of the early Holocene. Near perennial sea ice conditions with short summers and 79NG retreat to the inner fjord then prevailed from ~7.5 to ~0.8 ka.
    Description: Key Points: Multiproxy record allowed reconstruction of NEG ice sheet retreat and sea ice history from the last deglaciation to the late Holocene. Increased inflow of warm recirculating Atlantic Water linked to retreat and disintegration of the 79NG between 10 and 7.5 ka. Extended to even perennial sea ice conditions were predominant on the inner NE Greenland shelf since 7.5 ka.
    Description: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI) http://dx.doi.org/10.13039/501100003207
    Description: NERC Radiocarbon Laboratory
    Description: UK NERC
    Keywords: 551.31 ; sea‐ice ; Holocene ; biomarkers ; Northeast Greenland ; 79°Glacier ; Greenland Ice Sheet
    Type: article
    Location Call Number Limitation Availability
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    CITATION GEO-LEO
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