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Schubert, Carsten J (2009): Organic geochemistry on sediment profiles from the Arctic Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.729809, Supplement to: Schubert, CJ (1995): Organischer Kohlenstoff in spätquartären Sedimenten des Arktischen Ozeans: Terrigener Eintrag und marine Produktivität (Organic carbon in late Quaternary Arctic Ocean sediments: Terrigenous supply and marine productivity). Berichte zur Polarforschung = Reports on Polar Research, 177, 178 pp, https://doi.org/10.2312/BzP_0177_1995

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Abstract:
During the ARCTIC '91-Expedition with RV 'Polarstern', several Multicorer and Kastenlot-cores were recovered along a profile crossing the eastern part of the Arctic Ocean. The investigated cores consist mainly of clayey-silty sediments, and some units with a higher sand content. In this thesis, detailed sedimentological and organic-geochemical investigations were performed. In part, the near surface sediments were AMS-14C dated making it possible to Interpret the results of the organic-geochemical investigations in terms of climatic changes (isotopic stage 2 to the Holocene). The more or less absence of foraminifers within the long cores prevented the development of an oxygen isotope stratigraphy. Only the results of core PS2174-5 from the Amundsen-Basin could be discussed in terms of the climatic change that could be dated back to oxygen isotope stage 7.
Detailed organic-geochemical investigations in the central Arctic Ocean are rare. Therefore, several different organic-geochemical methods were used to obtain a wide range of data for the Interpretation of the organic matter. The high organic carbon content of the surface sediments is derived from a high input of terrigenous organic matter. The terrigenous organic material is most likely entrained within the sea-ice On the Siberian shelves and released during ice-drift over the Arctic Ocean. Other factors such as iceberg-transport and turbidites are also responsible for the high input of terrigenous organic matter. Due to the more or less closed sea-ice Cover, the Arctic Ocean is known as a low productivity system. A model shows, that only 2 % of the organic matter in central Arctic Ocean sediments is of a marine origin. The influence of the West-Spitsbergen current increases the marine organic matter content to 16 %.
Short chain n-alkanes (C17 and C19) can be used as a marker of marine productivity in the Arctic Ocean. Higher contents of short chain n-alkanes exist in surface sediments of the Lomonosov-Ridge and the Makarov-Basin, indicating a higher marine productivity caused by a reduced sea-ice Cover. The Beaufort-Gyre and Transpolar-Drift drift Patterns could be responsible for the lower sea-ice distribution in this region. The sediments of Stage 2 and Stage 3 in this region are also dominated by a higher content of short chain-nalkanes indicating a comparable ice-drift Pattern during that time.
The content and composition of organic carbon in the sediments of core PS2174-5 reflect glaciallinterglacial changes. Interglacial stages 7 and 5e show a low organic carbon content (C 0,5 %) and, as indicated by high hydrogen-indices, low CIN-ratios, higher content of n-alkanes (C17 and C19) and a higher opal content, a higher marine productivity. In the Holocene, a high content of foraminifers, coccoliths, ostracodes, and sponge spicules indicate higher surface-water productivity. Nevertheless, the low hydrogenindices reveal a high content of terrigenous organic matter. Therefore, the Holocene seems to be different from interglacials 7 and 5e.
During the glacial periods (stages 6, upper 5, and 4), TOC-values are significantly higher (0.7 to 1.3 %). In addition, low hydrogen-indices, high CIN-ratios, low short chain n-alkanes and opal contents provide evidence for a higher input of terrigenous organic matter and reduced marine productivity. The high lignin content in core sections with high TOC-contents, substantiates the high input of terrigenous organic matter. Changes in the content and composition of the organic carbon is believed to vary with the fluctuations in sea-level and sea-ice coverage.
Related to:
Stein, Ruediger; Schubert, Carsten J; Grobe, Hannes; Fütterer, Dieter K (1994): Late Quaternary changes in sediment composition in the central Arctic Ocean: first results of the ARCTIC '91 expedition. In: Thurston, D K (ed.), Proceedings of the international Conference on Arctic Margins, Alaska Geological Society, Anchorage, 1992, 363-368, hdl:10013/epic.13603.d001
Project(s):
Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo)
Quaternary Environment of the Eurasian North (QUEEN)
Funding:
Fourth Framework Programme (FP4), grant/award no. MAS3980185: Quaternary Environment of the Eurasian North
Coverage:
Median Latitude: 87.517178 * Median Longitude: 98.273904 * South-bound Latitude: 83.960300 * West-bound Longitude: 0.000000 * North-bound Latitude: 90.000000 * East-bound Longitude: 159.167500
Date/Time Start: 1991-08-09T00:00:00 * Date/Time End: 1991-09-07T00:00:00
Event(s):
PS2159-3 (PS19/152) * Latitude: 83.960300 * Longitude: 30.369700 * Date/Time: 1991-08-09T00:00:00 * Elevation: -4055.0 m * Penetration: 0.34 m * Recovery: 0.34 m * Location: Nansen Basin * Campaign: ARK-VIII/3 (PS19 ARCTIC91) * Basis: Polarstern * Method/Device: MultiCorer (MUC)
PS2160-3 (PS19/153) * Latitude: 84.881300 * Longitude: 37.951700 * Date/Time: 1991-08-10T00:00:00 * Elevation: -4029.0 m * Penetration: 0.4 m * Recovery: 0.4 m * Location: Nansen Basin * Campaign: ARK-VIII/3 (PS19 ARCTIC91) * Basis: Polarstern * Method/Device: MultiCorer (MUC)
PS2161-1 (PS19/154) * Latitude: 85.449500 * Longitude: 44.421500 * Date/Time: 1991-08-11T00:00:00 * Elevation: -4005.0 m * Penetration: 0.49 m * Recovery: 0.49 m * Location: Nansen Basin * Campaign: ARK-VIII/3 (PS19 ARCTIC91) * Basis: Polarstern * Method/Device: Giant box corer (GKG)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
27 datasets

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Datasets listed in this publication series

  1. Schubert, CJ (1996): Organic geochemistry of sediment core PS2159-3. https://doi.org/10.1594/PANGAEA.51027
  2. Schubert, CJ (1996): Organic geochemistry of sediment core PS2160-3. https://doi.org/10.1594/PANGAEA.51028
  3. Schubert, CJ (1996): Organic geochemistry of sediment core PS2161-1. https://doi.org/10.1594/PANGAEA.51029
  4. Schubert, CJ (1996): Organic geochemistry of sediment core PS2163-1. https://doi.org/10.1594/PANGAEA.51030
  5. Schubert, CJ (1996): Organic geochemistry of sediment core PS2165-5. https://doi.org/10.1594/PANGAEA.51031
  6. Schubert, CJ (1996): Organic geochemistry of sediment core PS2170-4. https://doi.org/10.1594/PANGAEA.51032
  7. Schubert, CJ (1996): Organic geochemistry of sediment core PS2171-2. https://doi.org/10.1594/PANGAEA.51033
  8. Schubert, CJ (1996): Organic geochemistry of sediment core PS2171-4. https://doi.org/10.1594/PANGAEA.51046
  9. Schubert, CJ (1996): Organic geochemistry of sediment core PS2174-2. https://doi.org/10.1594/PANGAEA.51034
  10. Schubert, CJ (1996): Organic geochemistry of sediment core PS2174-5. https://doi.org/10.1594/PANGAEA.51035
  11. Schubert, CJ (1996): Organic geochemistry of sediment core PS2175-4. https://doi.org/10.1594/PANGAEA.51036
  12. Schubert, CJ (1996): Organic geochemistry of sediment core PS2176-2. https://doi.org/10.1594/PANGAEA.51037
  13. Schubert, CJ (1996): Organic geochemistry of sediment core PS2176-3. https://doi.org/10.1594/PANGAEA.51038
  14. Schubert, CJ (1996): Organic geochemistry of sediment core PS2177-3. https://doi.org/10.1594/PANGAEA.51039
  15. Schubert, CJ (1996): Organic geochemistry of sediment core PS2177-5. https://doi.org/10.1594/PANGAEA.51040
  16. Schubert, CJ (1996): Organic geochemistry of sediment core PS2178-4. https://doi.org/10.1594/PANGAEA.51041
  17. Schubert, CJ (1996): Organic geochemistry of sediment core PS2178-5. https://doi.org/10.1594/PANGAEA.51042
  18. Schubert, CJ (1996): Organic geochemistry of sediment core PS2179-3. https://doi.org/10.1594/PANGAEA.51043
  19. Schubert, CJ (1996): Organic geochemistry of sediment core PS2181-4. https://doi.org/10.1594/PANGAEA.51044
  20. Schubert, CJ (1996): Organic geochemistry of sediment core PS2182-4. https://doi.org/10.1594/PANGAEA.51045
  21. Schubert, CJ (1996): Organic geochemistry of sediment core PS2184-3. https://doi.org/10.1594/PANGAEA.51047
  22. Schubert, CJ (1996): Organic geochemistry of sediment core PS2185-3. https://doi.org/10.1594/PANGAEA.51048
  23. Schubert, CJ (1996): Organic geochemistry of sediment core PS2185-6. https://doi.org/10.1594/PANGAEA.51049
  24. Schubert, CJ (1996): Organic geochemistry of sediment core PS2187-4. https://doi.org/10.1594/PANGAEA.51050
  25. Schubert, CJ (1996): Organic geochemistry of sediment core PS2187-5. https://doi.org/10.1594/PANGAEA.51051
  26. Schubert, CJ (1996): Organic geochemistry of sediment core PS2190-1. https://doi.org/10.1594/PANGAEA.51052
  27. Schubert, CJ (1996): Organic geochemistry of sediment core PS2190-5. https://doi.org/10.1594/PANGAEA.51053