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  • 2020-2024  (20)
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  • 1
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    Active Nordic Seas deep-water formation during the last glacial maximum (2022)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: The Nordic Seas are the primary location where the warm waters of the North Atlantic Current densify to form North Atlantic Deep Water, which plays a key part in the modern Atlantic Meridional Overturning Circulation. The formation of dense water in the Nordic Seas and Arctic Ocean and resulting ocean circulation changes were probably driven by and contributed to the regional and global climate of the last glacial maximum (LGM). Here we map the source and degree of mixing of deep water in the Nordic Seas and through the Arctic Gateway (Yermak Plateau) over the past 35 thousand years using neodymium isotopes (εNd) measured on authigenic phases in deep-sea sediments with a high spatial and temporal resolution. We find that a large-scale reorganization of deep-water formation in the Nordic Seas took place between the LGM (23–18 thousand years ago) and the rapid climate shift that accompanied the subsequent deglaciation (18–10 thousand years ago). We show that homogeneous εNd signatures across a wide range of sites support LGM deep-water formation in the Nordic Seas. In contrast, during the deglaciation, disparate and spatially variable εNd values are observed leading to the conclusion that deep-water formation may have been reduced during this time.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Saharan dust transported Quartz grains in sediment cores GIK13289-1/-2 and GIK13291-1, off Senegal (NW Africa) (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Description: Two deep-sea cores, GIK13891 and GIK13291, retrieved off Mauretania (NW Africa) from the top of a ca. 250 m high seamount and from the seamount's foot were studied. Planktonic foraminifera oxygen isotope records in conjunction with 14C ages in the upper core sections were used to establish a stratigraphy. Sedimentological studies of both cores focused on the occurrence and abundance of giant grains of up to 1500 µm. Three possible transport ways for those giant grains are being discussed: a) transport by turbidity currents b) erosion from the seamount top c) eolian delivery. The sedimentological results, including SEM pictures, point mainly to erosion and additional eolian delivery of the giant grains.
    Keywords: GIK/IfG; Institute for Geosciences, Christian Albrechts University, Kiel; NW Africa; quartz grains; Saharan dust; Senegal
    Type: Dataset
    Format: application/zip, 6 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Glacial to deglacial reservoir ages of surface waters in the southern South Pacific (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Description: Ocean sediment records document abrupt changes in glacial-to-deglacial circulation and mixing of the ocean, recorded as changes in 14C reservoir ages of surface waters. Here we present 14C-based high-resolution age records of four sediment cores from the western and eastern continental margins of the South Pacific. Global correlation of centennial-scale ocean variability requires centennial-scale precision in age control which can be established by means of 14C plateau tuning. The accuracy and precision of plateau tuning are now confirmed in two sediment cores off Chile; in one core by independent land-based age control of four tephra layers, in a second core by a suite of peak glacial sediment varves. The results from the cores support the model of a bipolar seesaw at the onset of fast deglacial Antarctic warming, moreover, they show that the Antarctic Cold Reversal immediately preceded the onset of the Younger Dryas cold spell. During peak glacial times, high reservoir ages reaching up to ~1500 yr and paired ice-rafted debris and sediment laminations may reflect seasonal sea ice and/or a melt water lid at high latitudes off southern Chile, likewise east of Southern New Zealand.
    Keywords: 14C plateau tuning; ages of tephra layers; bipolar seesaw; centennial-scale ocean variability; deglacial variability; GIK/IfG; Institute for Geosciences, Christian Albrechts University, Kiel; Last Glacial Maximum; peak glacial sediment varves; planktic 14C reservoir ages; Radiocarbon chronology; southern South Pacific
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Number of quartz grains 〉150 µm and percentage distribution by size range between 150 µm and 〉400 µm in sediment core GIK13289-1/-2 (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Keywords: Atlantic Ocean; BCR; Box corer (Reineck); Counting 〉150 µm fraction; Counting 〉400 µm fraction; Counting 150-175 µm fraction; Counting 175-200 µm fraction; Counting 200-225 µm fraction; Counting 225-250 µm fraction; Counting 250-275 µm fraction; Counting 275-300 µm fraction; Counting 300-325 µm fraction; Counting 325-350 µm fraction; Counting 350-375 µm fraction; Counting 375-400 µm fraction; DEPTH, sediment/rock; GIK/IfG; GIK13289-1/2; Institute for Geosciences, Christian Albrechts University, Kiel; NW Africa; Quartz; quartz grains; Saharan dust; Senegal; VA-10/3; Valdivia (1961)
    Type: Dataset
    Format: text/tab-separated-values, 444 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Sample dry weights and accumulation rates for bulk sediment and carbonate-free sand-sized fractions of sediment core GIK13289-1/-2 (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Keywords: Accumulation rate, carbonate free per year; Accumulation rate per year; Atlantic Ocean; BCR; Box corer (Reineck); Carbonate removal with acetic acid and weighing of dried sample fraction; DEPTH, sediment/rock; Dry mass; GIK/IfG; GIK13289-1/2; Institute for Geosciences, Christian Albrechts University, Kiel; NW Africa; quartz grains; Saharan dust; Sample volume; Senegal; VA-10/3; Valdivia (1961)
    Type: Dataset
    Format: text/tab-separated-values, 246 data points
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    DATA PANGAEA
  • 6
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    Radiocarbon chronology of sediment core GIK23074-1 (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Keywords: Age, 14C AMS; Age, dated; Age, dated standard error; Age, difference; Age, Uranium-Thorium; Age model; calculated, 1 sigma; Calendar age; Deposition time; DEPTH, sediment/rock; GIK/IfG; GIK23074-1; Institute for Geosciences, Christian Albrechts University, Kiel; KAL; Kasten corer; Laboratory code/label; M2/2; Meteor (1986); Norwegian Sea; Plateau; Reservoir age; Reservoir effect/correction; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 358 data points
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    DATA PANGAEA
  • 7
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    Radiocarbon chronology of sediment core PS75/104-1 (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Keywords: Age, 14C AMS; Age, dated; Age, dated standard error; Age, Uranium-Thorium; Age model; ANT-XXVI/2; Depth, error; DEPTH, sediment/rock; Fraction modern carbon; Fraction modern carbon, error; GIK/IfG; Institute for Geosciences, Christian Albrechts University, Kiel; KL; Laboratory code/label; Piston corer (BGR type); Plateau; Polarstern; PS75/104-1; PS75 BIPOMAC; Reservoir age; Reservoir age, standard error; Sedimentation rate; South Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 653 data points
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    DATA PANGAEA
  • 8
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    Foraminiferal and sediment leachate neodymium isotopes from the Nordic Seas and Arctic Ocean (2022)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: Authigenic neodymium isotopes measured on bulk sediment leachates and mixed planktic foraminifera from deep-sea sediment cores from the Nordic Seas and Arctic Ocean dated from the last glacial to modern. Data was used to reconstruct past changes in ocean circulation in this region. Neodymium isotope data was collected on a Thermo Fischer Neptune Plus Multicollector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS).
    Keywords: 104-642B; AGE; Arctic Ocean; ARK-II/5; ARK-IX/4; ARK-VII/1; ARK-VIII/3; Barents Sea; BC; Box corer; Comment; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Foraminifera, planktic ε-Neodymium; Foraminifera, planktic ε-Neodymium, standard deviation; Fram Strait; GC; Giant box corer; GIK17730-4; GIK21878-2 PS17/050; GIK21878-3 PS17/050; GIK23071-2; GIK23071-3; GIK23074-1; GIK23243-2 PS05/431; GIK23262-2; GKG; Gravity corer; Greenland Sea; Healy; Healy-Oden Trans Arctic Expedition 2005 (HOTRAX05); Helmer Hanssen; HH11; HH11-09GC; HH2011; HLY0503; HLY0503-22JPC-TC; James Clark Ross; Joides Resolution; JPC; JR142; JR142-GC19; JR20000727; JR20060728; JR20080823; JR211; JR211-16GC; JR51; JR51-28GC; Jumbo Piston Core; KAL; Kasten corer; Laptev Sea; Leg104; M13/2; M2/2; M7/2; MC-ICP-MS (Thermo Scientific, Neptune); Meteor (1986); Neodymium isotopes; Nordic Seas; Norwegian Sea; PC; Piston corer; Polarstern; PS05; PS1243-2; PS17; PS1878-2; PS1878-3; PS19/245; PS19 ARCTIC91; PS2212-3; PS2474-3; PS27; PS27/059; Sample code/label; V27; V27-60; V27-86; Vema; Yermak Plateau; ε-Neodymium, authigenic; ε-Neodymium, authigenic, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 432 data points
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    DATA PANGAEA
  • 9
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    Stable isotope ratios of benthic foraminifera of sediment core GIK13289-1/2 (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Keywords: Atlantic Ocean; BCR; Box corer (Reineck); Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; GIK/IfG; GIK13289-1/2; Institute for Geosciences, Christian Albrechts University, Kiel; Mass spectrometer Finnigan MAT 251; NW Africa; quartz grains; Saharan dust; Senegal; Uvigerina peregrina, δ13C; Uvigerina peregrina, δ18O; VA-10/3; Valdivia (1961)
    Type: Dataset
    Format: text/tab-separated-values, 114 data points
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    DATA PANGAEA
  • 10
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    Stable isotope ratios of planktonic foraminifera of sediment core GIK13289-1/2 (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-03
    Keywords: Atlantic Ocean; BCR; Box corer (Reineck); DEPTH, sediment/rock; GIK/IfG; GIK13289-1/2; Globigerina bulloides, δ13C; Globigerina bulloides, δ18O; Globigerinoides ruber white, δ13C; Globigerinoides ruber white, δ18O; Globorotalia inflata, δ13C; Globorotalia inflata, δ18O; Institute for Geosciences, Christian Albrechts University, Kiel; Mass spectrometer Finnigan MAT 251; NW Africa; quartz grains; Saharan dust; Senegal; VA-10/3; Valdivia (1961)
    Type: Dataset
    Format: text/tab-separated-values, 224 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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