Vogts, Angela; Badewien, Tanja; Rullkötter, Jürgen; Schefuß, Enno (2016): Hydrogen isotope compositions of terrestrial plant-wax n-alkanes analysed on a transect of marine surface sediment samples from 1°N to 28°S off southwest Africa. PANGAEA, https://doi.org/10.1594/PANGAEA.859819, Supplement to: Vogts, A et al. (2016): Near-constant apparent hydrogen isotope fractionation between leaf wax n-alkanes and precipitation in tropical regions: Evidence from a marine sediment transect off SW Africa. Organic Geochemistry, 96, 18-27, https://doi.org/10.1016/j.orggeochem.2016.03.003
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A transect of marine surface sediment samples from 1° N to 28° S off southwest Africa was analysed to verify the application of hydrogen isotope compositions of terrestrial plant-wax n-alkanes preserved in ocean sediments as a proxy for continental hydrological conditions. Conditions on the adjacent continent range from humid evergreen forests to deciduous forests, wood- and shrub land and further to arid grasslands and deserts. The hydrogen isotope values for the dominant n-alkane homologues (C29, C31 and C33) vary from -123 per mil to -141 per mil VSMOW and correlate with the modelled hydrogen isotope composition of mean annual and growing season precipitation of postulated continental source areas (r up to 0.8, p < 0.01). The apparent hydrogen isotope fractionation between alkanes and mean annual precipitation is remarkably uniform (-109 per mil on average, Sigma <= 5 per mil, n = 27). Potentially, effects of aridity on the apparent hydrogen isotope fractionation are concealed by the contribution of different plants (C3 dicotyledons vs C4 grasses). Thus, isotope ratios of leaf wax n-alkanes preserved in ocean margin sediments in these and similar tropical regions may be directly converted to dD ratios of ancient precipitation by employing a constant hydrogen isotope fractionation.
Median Latitude: -13.742015 * Median Longitude: 12.571770 * 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
Datasets listed in this publication series
- Vogts, A; Badewien, T; Rullkötter, J et al. (2016): (Supplementary Table 1) Locations employed to depict continental environmental conditions at ca. 350 km from the coast. https://doi.org/10.1594/PANGAEA.859455
- Vogts, A; Badewien, T; Rullkötter, J et al. (2016): (Supplementary Table 2) Data of locations employed as representatives of potential catchment areas. https://doi.org/10.1594/PANGAEA.859501
- Vogts, A; Badewien, T; Rullkötter, J et al. (2016): (Supplementary Table 3) Monthly values for hydrogen isotopic composition and precipitation amount in potential catchment areas. https://doi.org/10.1594/PANGAEA.859555
- Vogts, A; Badewien, T; Rullkötter, J et al. (2016): (Table 1) Sample information and stable hydrogen isotope composition of long-chain n-alkanes and weighted mean average stable hydrogen isotope composition. https://doi.org/10.1594/PANGAEA.859572
- Vogts, A; Badewien, T; Rullkötter, J et al. (2016): (Table 2) Hydrogen isotope composition of precipitation for postulated continental source areas. https://doi.org/10.1594/PANGAEA.859644
- Vogts, A; Badewien, T; Rullkötter, J et al. (2016): (Table 3) Apparent hydrogen isotope fractionation between sediment derived n-alkanes and calculated mean annual precipitation for continental locations at 350 km distance from the coast in postulated source areas. https://doi.org/10.1594/PANGAEA.859809
- Vogts, A; Badewien, T; Rullkötter, J et al. (2016): (Table 5) C4 contribution to the dominating n-alkanes and correlation coefficients for the apparent fractionation of the alkanes. https://doi.org/10.1594/PANGAEA.859812