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Vogts, Angela; Schefuß, Enno; Badewien, Tanja; Rullkötter, Jürgen (2012): n-Alkane analyses from an transect of marine surface sediments off southwest Africa. PANGAEA,, Supplement to: Vogts, A et al. (2012): n-Alkane parameters from a deep sea sediment transect off Southwest Africa reflect continental vegetation and climate conditions. Organic Geochemistry, 47, 109-119,

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An isobathic transect of marine surface sediments from 1°N to 28°S off southwest Africa was used to further evaluate the potential of the chain length distribution and carbon stable isotope composition of higher plant n-alkanes as proxies for continental vegetation and climate conditions. We found a strong increase in the n-C29-33 weighted mean average d13C values from -33 per mil near the equator to around -26 per mil further south. Additionally, C25-35n-alkanes reveal a southward trend of increasing average chain length from 30.0 to 30.5. The data reflect the changing contribution of plants employing different photosynthetic pathways (C3 and C4) and/or being differently influenced by the environmental conditions of their habitat. The C4 plant proportions calculated from the data (ca. 20% for rivers draining the rainforest, to ca. 70% at higher latitude) correspond to the C4 plant abundance in continental catchment areas postulated by considering prevailing wind systems and river outflows. Furthermore, the C4 plant contribution to the sediments correlates with the mean annual precipitation and aridity at selected continental locations in the postulated catchment areas, suggesting that the C4 plant fraction in marine sediments can be used to assess these environmental parameters.
Median Latitude: -13.772784 * Median Longitude: 12.566642 * South-bound Latitude: -33.500000 * West-bound Longitude: 8.378333 * North-bound Latitude: 4.000000 * East-bound Longitude: 22.000000
Date/Time Start: 1996-01-31T00:00:00 * Date/Time End: 1998-03-10T13:09:00
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  1. Vogts, A; Schefuß, E; Badewien, T et al. (2012): (Supplementary Table A ) Locations employed for calculation of continental environmental conditions with WebWIMP Modelling program and values obtained as displayed in Fig. 1.
  2. Vogts, A; Schefuß, E; Badewien, T et al. (2012): (Supplementary Table B) Data for locations employed as representatives of potential catchment areas.
  3. Vogts, A; Schefuß, E; Badewien, T et al. (2012): (Table 1) Sample information and analytical data for bulk material with standard deviation (1 Sigma).
  4. Vogts, A; Schefuß, E; Badewien, T et al. (2012): (Table 2) Major terrestrial n-alkanes.
  5. Vogts, A; Schefuß, E; Badewien, T et al. (2012): (Table 3) Stable carbon isotope composition of major terrestrial n-alkanes with standard deviation (1 Sigma) of measurements and weighted mean average (WMA).
  6. Vogts, A; Schefuß, E; Badewien, T et al. (2012): (Table 5) Calculations of abundance of C4 plant-derived material at sample locations based on different n-alkane parameters.
  7. Vogts, A; Schefuß, E; Badewien, T et al. (2012): (Table 6) Postulated scenarios explaining abundance of C4 plant material in sediments based on river discharge and wind trajectories and map of proportion (%) of continental vegetation using the C4 pathway.