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  • ARK-VIII/2; AWI_Paleo; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS19/112; PS19 EPOS II; PS2138-1; Quaternary Environment of the Eurasian North; QUEEN; SL; Svalbard  (2)
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  • 1
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    Planktonic isotope record and clay mineralogy of sediment core PS2138-1
    PANGAEA
    In:  Supplement to: Knies, Jochen; Vogt, Christoph (2003): Freshwater pulses in the eastern Arctic Ocean during Saalian and Early Weichselian ice-sheet collapse. Quaternary Research, 60(3), 243-251, https://doi.org/10.1016/j.yqres.2003.07.008
    Details
    Publication Date: 2023-06-27
    Description: Improved multiparameter records from the northern Barents Sea margin show two prominent freshwater pulses into the Arctic Ocean during MIS 5 that significantly disturbed the regional oceanic regime and probably affected global climate. Both pulses are associated with major iceberg-rafted debris (IRD) events, revealing intensive iceberg/sea ice melting. The older meltwater pulse occurred near the MIS 5/6 boundary (~131,000 yr ago); its ~2000 year duration and high IRD input accompanied by high illite content suggest a collapse of large-scale Saalian Glaciation in the Arctic Ocean. Movement of this meltwater with the Transpolar Drift current into the Fram Strait probably promoted freshening of Nordic Seas surface water, which may have increased sea-ice formation and significantly reduced deep-water formation. A second pulse of freshwater occurred within MIS 5a (~77,000 yr ago); its high smectite content and relatively short duration is possibly consistent with sudden discharge of Early Weichselian ice-dammed lakes in northern Siberia as suggested by terrestrial glacial geologic data. The influence of this MIS 5a meltwater pulse has been observed at a number of sites along the Transpolar Drift, through Fram Strait, and into the Nordic Seas; it may well have been a trigger for the North Atlantic cooling event C20.
    Keywords: ARK-VIII/2; AWI_Paleo; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS19/112; PS19 EPOS II; PS2138-1; Quaternary Environment of the Eurasian North; QUEEN; SL; Svalbard
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Magnetostratigraphy of sediment cores from the eastern Arctic Ocean
    PANGAEA
    In:  Supplement to: Nowaczyk, Norbert R; Knies, Jochen (2000): Magnetostratigraphic results from Eastern Arctic Ocean - AMS14C ages and relative palaeointensity data of the Mono Lake and Laschamp geomagnetic events. Geophysical Journal International, 140, 185-197, https://doi.org/10.1046/j.1365-246x.2000.00001.x
    Details
    Publication Date: 2023-06-27
    Description: A new high-resolution magnetostratigraphic record from the eastern Arctic Ocean has yielded further evidence for the existence of the Laschamp excursion (37–35 ka), the Mono Lake excursion (27–25.5 ka) and possibly another very short excursion (22 ka) inferred from steep negative inclinations. Ages are based on nine AMS (accelerator mass spectrometry) 14C dates, oxygen isotope stratigraphy and correlation with ODP site 983. Estimates of relative palaeointensity variations for the time interval from 80 to 10 ka have revealed that the documented geomagnetic excursions are linked to large fluctuations of the relative palaeointensity. The lowest values were obtained for the two excursions and the normal–reversed (N–R) and reversed–normal (R–N) transitions of the Laschamp polarity excursion, which itself is characterized by a slight increase of relative palaeointensity during its reversed state. The results are in general agreement with palaeointensity studies from other regions, indicating that these fluctuations could be global phenomena and that the geomagnetic field of the Brunhes Chron was very variable in amplitude as well as in geometry. The new result is one of the rare records comprising large directional as well as large relative palaeointensity variations.
    Keywords: ARK-VIII/2; AWI_Paleo; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS19/112; PS19 EPOS II; PS2138-1; Quaternary Environment of the Eurasian North; QUEEN; SL; Svalbard
    Type: Dataset
    Format: application/zip, 5 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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