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Bogus, Kara A; Zonneveld, Karin A F; Fischer, David; Kasten, Sabine; Bohrmann, Gerhard; Versteegh, Gerard J M (2012): Organic matter based proxies from surface sediments along three transects on the Pakistan continental margin [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.804009, Supplement to: Bogus, KA et al. (2012): The effect of meter-scale lateral oxygen gradients at the sediment-water interface on selected organic matter based alteration, productivity and temperature proxies. Biogeosciences, 9, 1553-1570, https://doi.org/10.5194/bg-9-1553-2012

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Abstract:
A valid assessment of selective aerobic degradation on organic matter (OM) and its impact on OM-based proxies is vital to produce accurate environmental reconstructions. However, most studies investigating these effects suffer from inherent environmental heterogeneities. In this study, we used surface samples collected along two meter-scale transects and one longer transect in the northeastern Arabian Sea to constrain initial OM heterogeneity, in order to evaluate selective aerobic degradation on temperature, productivity and alteration indices at the sediment-water interface. All of the studied alteration indices, the higher plant alkane index, alcohol preservation index, and diol oxidation index, demonstrated that they are sensitive indicators for changes in the oxygen regime. Several export production indices, a cholesterol-based stanol/stenol index and dinoflagellate lipid- and cyst-based ratios, showed significant (more than 20%) change only over the lateral oxygen gradients. Therefore, these compounds do not exclusively reflect surface water productivity, but are significantly altered after deposition. Two of the proxies, glycerol dibiphytanyl glycerol tetraether-based TEX86 sea surface temperature indices and indices based on phytol, phytane and pristane, did not show any trends related to oxygen. Nevertheless, unrealistic sea surface temperatures were obtained after application of the TEX86, TEX86L, and TEX86H proxies. The phytol-based ratios were likely affected by the sedimentary production of pristane. Our results demonstrate the selective impact of aerobic organic matter degradation on the lipid and palynomorph composition of surface sediments along a short lateral oxygen gradient and suggest that some of the investigated proxies may be useful tracers of changing redox conditions at the sediment-water interface.
Project(s):
Center for Marine Environmental Sciences (MARUM)
Coverage:
Median Latitude: 24.494287 * Median Longitude: 62.874816 * South-bound Latitude: 24.191783 * West-bound Longitude: 62.738450 * North-bound Latitude: 24.884533 * East-bound Longitude: 63.027350
Date/Time Start: 2007-11-05T05:38:00 * Date/Time End: 2007-11-14T14:45:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
10 datasets

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Datasets listed in this publication series

  1. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Figure 3) Pore water oxygen and Fe2+ values of sediment core GeoB12312-3. https://doi.org/10.1594/PANGAEA.803595
  2. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Figure 3) Pore water oxygen and Fe2+ values of sediment core GeoB12321-1. https://doi.org/10.1594/PANGAEA.803649
  3. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Figure 3) Pore water oxygen and Fe2+ values of sediment core GeoB12331-1. https://doi.org/10.1594/PANGAEA.803650
  4. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Figure 4) Manganese porewater concentrations of sediment core GeoB12326-8. https://doi.org/10.1594/PANGAEA.803653
  5. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Figure 4) Manganese porewater concentrations of sediment core GeoB12326-10. https://doi.org/10.1594/PANGAEA.803699
  6. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Supplement 1) Lipid biomarkers in the three investigated transects, OMZ (GeoB 12312, 12321, 12331), below-OMZ-seep (GeoB 12326), and OMZ-seep (GeoB 12328). https://doi.org/10.1594/PANGAEA.803860
  7. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Supplement 2) GDGT peak areas and distribution used in the TEX86 indices calculated for the three studied transects, OMZ (GeoB 12312, 12321, 12331), below-OMZ-seep (GeoB 12326) and OMZ-seep (GeoB 12328). https://doi.org/10.1594/PANGAEA.803857
  8. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Supplement 3) Dinoflagellate cyst concentrations of the three transects OMZ (GeoB 12312, 12321, 12331), below-OMZ-seep (GeoB 12326), and OMZ-seep (GeoB 12328). https://doi.org/10.1594/PANGAEA.803811
  9. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Supplement 3) Dinoflagellate cyst count data by species of the three transects OMZ (GeoB 12312, 12321, 12331), below-OMZ-seep (GeoB 12326), and OMZ-seep (GeoB 12328). https://doi.org/10.1594/PANGAEA.803795
  10. Bogus, KA; Zonneveld, KAF; Fischer, D et al. (2012): (Table 1) Sample location descriptions and oxygen classification scheme. https://doi.org/10.1594/PANGAEA.803764