Schefuß, Enno; Schouten, Stefan; Jansen, J H Fred; Sinninghe Damsté, Jaap S (2004): Accumulation rates of plant-wax-derived long-chain C25 to C35 odd-numbered n-alkanes and δ¹³C values of the n-C31 alkane of ODP Hole 175-1077B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.139752, Supplement to: Schefuß, E et al. (2003): African vegetation controlled by tropical sea surface temperatures in the mid-Pleistocene period. Nature, 422(6930), 418-421, https://doi.org/10.1038/nature01500
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Abstract:
The dominant forcing factors for past large-scale changes in vegetation are widely debated. Changes in the distribution of C4 plants-adapted to warm, dry conditions and low atmospheric CO2 concentrations (Collatz et al., 1998, doi:10.1007/s004420050468) -have been attributed to marked changes in environmental conditions, but the relative impacts of changes in aridity, temperature (Pagani et al., 1999, doi:10.1126/science.285.5429.876; Huang et al., 2001, doi:10.1126/science.1060143) and CO2 concentration (Cerling et al., 1993, doi:10.1038/361344a0; Kuypers et al., 1999, doi:10.1038/20659) are not well understood. Here, we present a record of African C4 plant abundance between 1.2 and 0.45 million years ago, derived from compound-specific carbon isotope analyses of wind-transported terrigenous plant waxes. We find that large-scale changes in African vegetation are linked closely to sea surface temperatures in the tropical Atlantic Ocean. We conclude that, in the mid-Pleistocene, changes in atmospheric moisture content - driven by tropical sea surface temperature changes and the strength of the African monsoon - controlled aridity on the African continent, and hence large-scale vegetation changes.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -5.179940 * Longitude: 10.436360
Date/Time Start: 1997-08-30T11:30:00 * Date/Time End: 1997-08-31T04:55:00
Minimum DEPTH, sediment/rock: 62.77 m * Maximum DEPTH, sediment/rock: 144.99 m
Event(s):
175-1077B * Latitude: -5.179940 * Longitude: 10.436360 * Date/Time Start: 1997-08-30T11:30:00 * Date/Time End: 1997-08-31T04:55:00 * Elevation: -2381.4 m * Penetration: 205.1 m * Recovery: 211.45 m * Location: Benguela Current, South Atlantic Ocean * Campaign: Leg175 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 205.1 m cored; 0 m drilled; 103.1 % recovery
Comment:
mcd-scale after Jansen & Dupont (2001, doi:10.2973/odp.proc.sr.175.236.2001), Age after Dupont et al. (2001, doi:10.1130/0091-7613(2001)029<0195:MPECIT>2.0.CO;2)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | Depth, composite | Depth comp | mcd | Schefuß, Enno | Intercore correlation | |
| 4 | Sample code/label | Sample label | Schefuß, Enno | DSDP/ODP/IODP sample designation | ||
| 5 | Accumulation rate, mass | MAR | g/cm2/ka | Schefuß, Enno | Calculated, see reference(s) | |
| 6 | Sum n-alkanes C25-C35 | s n-alk (25-35) | µg/g | Schefuß, Enno | Calculated, see reference(s) | |
| 7 | Sum odd numbered n-alkanes C25-C35 | A odd (25-35) | µg/g | Schefuß, Enno | Calculated, see reference(s) | |
| 8 | n-Alkane, average chain length | ACL n-Alkane | Schefuß, Enno | Calculated, see reference(s) | ||
| 9 | n-Alkane, C31/(C29+C31) ratio | Norm31 | Schefuß, Enno | Calculated, see reference(s) | ||
| 10 | Carbon Preference Index, n-Alkanes (C25-C33) | CPI 25-33 | Schefuß, Enno | Calculated, see reference(s) | ||
| 11 | n-Alkane C25-C35, flux | Flux C25-C35 | µg/m2/a | Schefuß, Enno | Calculated, see reference(s) | |
| 12 | Sum odd numbered n-alkanes C25-C35, flux | A odd (C25-C35) flux | µg/m2/a | Schefuß, Enno | Calculated, see reference(s) | |
| 13 | n-Alkane C29, δ13C | C29 δ13C | ‰ PDB | Schefuß, Enno | Gas chromatography - Mass spectrometry (GC-MS) | |
| 14 | n-Alkane C4 plant, reference to C29 | C4 plant n-Alkane ref C29 | % | Schefuß, Enno | Calculated, see reference(s) | calculation: C4 = -21.5 per mil, C3 = -36.0 per mil |
| 15 | n-Alkane C31, δ13C | C31 δ13C | ‰ PDB | Schefuß, Enno | Gas chromatography - Mass spectrometry (GC-MS) | |
| 16 | n-Alkane C4 plant, reference to C31 | C4 plant n-Alkane ref C31 | % | Schefuß, Enno | Calculated, see reference(s) | calculation: C4 = -21.5 per mil, C3 = -36.0 per mil |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2492 data points
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