Data Description

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Citation:
Knies, J (1994): Investigations on two sediment cores from the Arctic Ocean. doi:10.1594/PANGAEA.727527,
Supplement to: Knies, Jochen (1994): Spätquartäre Sedimentation am Kontinentalhang nordwestlich Spitzbergens. Der letzte Glazial/Interglazial-Zyklus. Diploma Thesis, Fachbereich Geowissenschaften und Geographie der Justus-Liebig-Universität Giessen & Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, 95 pp, hdl:10013/epic.33262.d001
Abstract:
During the "RV Polarstem"-Expedition ARK VIII/2 sediment samples were obtained at the continental slope of NW-Spitsbergen. Detailed sedimentological and geochemical analysis were carried out at two undisturbed box cores (PS2122-1GKG, PS2123-2GKG) as well as two gravity cores (PS2122-1SL, PS2123-2SL). The following parameters were deterrnined: Organic carbon, nitrogen and carbonate contents, hydrogen index, stable isotopes, ice rafted debris, grain-size distribution and biogenic opal. The main objective of this study was the reconstruction of paleoenvironmental changes off the northwest coast of Spitsbergen during the last glacial/interglacial-cycle, i.e., during the last about 128.000 years.
The results of the investigations can be summarized as follows:
- During isotope stage 1 (Holocene) and 5.5 (Eemian Interglacial), light stable isotopes (d180: 3.4-2 %o; d13C: 0.26-0.5 %o), increased bioturbation, high content of planktonic foraminifera and biogenic opal and low quantity of ice-rafted material, indicate seasonally ice-free conditions along the northwest coast due to the intfluence of the Westspitsbergen Current.
- Additionally, the sediment characteristics of the middle of isotope stage 2 (Last Glacial Maximum) and at the end of stage 3 confirms an inflow of warmer Atlantic water. The highest production of planktonic and benthic foraminifera (N. pachyderma sin., Cassidulina teretis) (CaC03: 10 %) may reflect the expansion of the 'Whalers Bay'-Polynya as a result of the influence of the Westspitsbergen Current. Presumably, occasionally open-ice conditions provide sufficient precipitation to buildup the Svalbard/Barents Ice Sheet.
- The time intervals for the glacier advances on Svalbard given by Mangerud et al. (1992), can be correlated with increased accumulation of ice-rafted material in the sediments at the northwest coast of Spitsbergen. Especially during isotope stage 4 and at the beginning of the Last Glacial Maximum (isotope stage 2), a drastically increased supply of coarse terrigenous material occurs. The high accumulation rate (0.18-0.21 g/cm**2/ka) of terrigenous organic carbon is indicated by high C/N ratios (until 16) and low hydrogen index (50 mg HC/gC). In constrast to deep sea sediments in the Fram-Strait (Hebbeln 1992), the glacier advance between 118.000 and 108.000 years B.P. ist documented in the continental slope sediments.
- At the end of the Weichselian ice age, the deglaciation at the northwest coast starts with a typical melt-water signal in the stables isotope record (d18O: 3.5 %o; d13C: -0.16 %o) and high contents of gravel (6-13 %). The signal can be assigned to an event at the westcoast of Spitsbergen (core NP90-39), dated to 14.500 years B.P. (Andersen et al. 1993).
Related to:
Rachor, Eike (1992): Scientific Cruise Report of the 1991 Arctic Expedition ARK-VIII/2 of RV Polarstern (EPOS II: Study of the European Arctic Shelf, SEAS, of the European Science Foundation) (Wissenschaftlicher Fahrtbericht über die Arktis-Expedition ARK VIII/2 von 1991 mit FS Polarstern). Berichte zur Polarforschung = Reports on Polar Research, 115, 150 pp, doi:10.2312/BzP_0115_1992 *
Other version:
Project(s):
Coverage:
Median Latitude: 80.263419 * Median Longitude: 8.678965 * South-bound Latitude: 80.134000 * West-bound Longitude: 7.507167 * North-bound Latitude: 80.390000 * East-bound Longitude: 9.856700
Date/Time Start: 1991-07-06T14:50:00 * Date/Time End: 1991-07-07T19:06:00
Event(s):
PS2122-1 (PS19/084) * * Latitude: 80.372917 * Longitude: 7.507167 * Date/Time: 1991-07-06T14:50:00 * Elevation: -702.0 m * Recovery: 0.45 m * Penetration: 0.45 m * Location: Yermak Plateau * * Campaign: ARK-VIII/2 (PS19 EPOS II) * * Basis: Polarstern * * Device: Giant box corer *
PS2122-2 (PS19/084) * * Latitude: 80.373000 * Longitude: 7.507167 * Date/Time: 1991-07-06T15:15:00 * Elevation: -702.0 m * Recovery: 5.78 m * Penetration: 10.00 m * Location: Yermak Plateau * * Campaign: ARK-VIII/2 (PS19 EPOS II) * * Basis: Polarstern * * Device: Gravity corer (Kiel type) * * Comment: Lot 10m
PS2123-2 (PS19/086) * * Latitude: 80.155500 * Longitude: 9.847833 * Date/Time: 1991-07-07T08:24:00 * Elevation: -573.0 m * Recovery: 6.48 m * Penetration: 10.00 m * Location: Yermak Plateau * * Campaign: ARK-VIII/2 (PS19 EPOS II) * * Basis: Polarstern * * Device: Gravity corer (Kiel type) * * Comment: Lot 10m
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