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  • 2020-2024  (21)
  • 2020-2022  (1)
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  • 1
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    Unknown
    Springer
    In:  (In Press / Accepted) International Journal of Earth Sciences .
    Publication Date: 2021-07-30
    Description: Summary of Ilse Seibold's vita Ilse Seibold, née Usbeck, was born May 8, 1925 in Breslau, Silesia, and went to school in Halle/Saale during WW2. She started her studies of geology and paleontology at the University of Halle and at the Humboldt University in Berlin, and later at the University of Tübingen, where she received her doctorate as micropaleontologist in 1951 with Otto Schindewolf as her supervisor. She remained active as productive scientist over many decades. In 1952, she married Dr. Eugen Seibold, who in 1958 became professor at Kiel University, founded one of Europe's most important institutes for marine geology, and later became president of the German Science Foundation (DFG), and subsequently of the European Science Foundation (ESF). Being a scientist herself Ilse Seibold soon evolved to a deeply reflective insider of geological sciences. She followed her husband during his scientific career from his appointments in Tübingen, Bonn, Karlsruhe, Kiel, to Bonn and Strasbourg/Freiburg i.Br. She accompanied Eugen on his sabbatical leave at Scripps Institution of Oceanography in La Jolla, CA. She participated in countless international scientific meetings. Together with Eugen she published many papers that document her independence and autonomy as scientist. She gained deep insights into the origins of the geosciences and their historical evolution, up to the ideas of fine arts. We are happy that she documented in her publications a broad range of her scientific and distinguished-humane impressions.
    Type: Article , NonPeerReviewed
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  • 2
    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
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  • 3
    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
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  • 4
    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
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  • 5
    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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  • 6
    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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  • 7
    Publication Date: 2024-02-03
    Keywords: Accumulation rate, carbonate free per year; Accumulation rate per year; Atlantic Ocean; Carbonate removal with acetic acid and weighing of dried sample fraction; DEPTH, sediment/rock; Dry mass; GIK/IfG; GIK13291-1; Institute for Geosciences, Christian Albrechts University, Kiel; KAL; Kasten corer; NW Africa; quartz grains; Saharan dust; Sample volume; Senegal; VA-10/3; Valdivia (1961)
    Type: Dataset
    Format: text/tab-separated-values, 288 data points
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  • 8
    Publication Date: 2024-02-03
    Keywords: Atlantic Ocean; 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; GIK13291-1; Institute for Geosciences, Christian Albrechts University, Kiel; KAL; Kasten corer; Quartz; VA-10/3; Valdivia (1961)
    Type: Dataset
    Format: text/tab-separated-values, 696 data points
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  • 9
    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
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  • 10
    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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