Baumann, Karl-Heinz (2025): Coccolith species abundances in ODP Site 1082 of the past 750 ka in the region of the Benguela Current (BC) system [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.974777
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Published: 2025-01-28 • DOI registered: 2025-02-26
Abstract:
Late Pleistocene coccolith data of ODP Site 1082 from the eastern South Atlantic off Namibia were analysed to document spatial and temporal changes in surface–ocean circulation, upwelling intensity, and associated productivity. The studied site is located on the continental slope close to prominent oceanographic features such as the coastal upwelling mixing area, the open oceanic realm, and the warm-water regime of the Angola Current. Highest numbers of total coccoliths up to >30x10⁹ coccoliths g⁻¹ sediment were observed during relatively warm periods characterised by decreased upwelling intensity. These elevated numbers of coccoliths are due to higher surface water temperatures and document a domain probably influenced by lower nutrient concentrations in an area where oceanic and filamentous water mix. In contrast, low numbers of coccoliths during glacial periods probably characterise time intervals of enhanced upwelling accompanied by a broad filamentous mixing area. Coccoliths of the genus Gephyrocapsa are the most abundant taxa in samples of Site 1082. Their occurrences are characterised by abrupt changes in the investigated time interval. In addition, Calcidiscus leptoporus, Pseudoemilinia lacunosa, and Reticulofenestra asanoi contribute a common part of the assemblage.
Related to:
Baumann, Karl-Heinz; Freitag, T (2004): Pleistocene fluctuations in the northern Benguela Current system as revealed by coccolith assemblages. Marine Micropaleontology, 52(1-4), 195-215, https://doi.org/10.1016/j.marmicro.2004.04.011
Project(s):
Ocean Drilling Program (ODP)
Funding:
German Research Foundation (DFG), grant/award no. Ba 1648/1: Evolution of coccolithophores in the Southeast Atlantic (ODP Site 1082)
Coverage:
Latitude: -21.094194 * Longitude: 11.820556
Date/Time Start: 1997-09-13T00:00:00 * Date/Time End: 1997-09-13T00:00:00
Minimum DEPTH, sediment/rock: 0.30 m * Maximum DEPTH, sediment/rock: 73.97 m
Event(s):
175-1082 * Latitude: -21.094194 * Longitude: 11.820556 * Date/Time: 1997-09-13T00:00:00 * Elevation: -1280.6 m * Penetration: 929.6 m * Recovery: 853 m * Location: Benguela Current, South Atlantic Ocean * Campaign: Leg175 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 102 cores; 929.6 m cored; 0 m drilled; 91.8% recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Baumann, Karl-Heinz | |||
| 2 | DEPTH, sediment/rock | Depth sed | m | Baumann, Karl-Heinz | Geocode – corrected | |
| 3 | AGE | Age | ka BP | Baumann, Karl-Heinz | Geocode | |
| 4 | Filter, area | Filter area | mm2 | Baumann, Karl-Heinz | ||
| 5 | Area | Area | mm2 | Baumann, Karl-Heinz | ||
| 6 | Sample mass | Samp m | g | Baumann, Karl-Heinz | ||
| 7 | Split factor | Split F | Baumann, Karl-Heinz | |||
| 8 | Coccoliths | Cocco | # | Baumann, Karl-Heinz | Counting | total |
| 9 | Coccoliths, total | Cocco | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 10 | Algirosphaera spp. | Algirosphaera spp. | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 11 | Calcidiscus leptoporus | C. leptoporus | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 12 | Calcidiscus quadriperforatus | C. quadriperforatus | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 13 | Coccolithus pelagicus | C. pelagicus | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 14 | Emiliania huxleyi | E. huxleyi | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 15 | Florisphaera profunda | F. profunda | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 16 | Gladiolithus flabellatus | G. flabellatus | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 17 | Gephyrocapsa caribbeanica | G. caribbeanica | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 18 | Gephyrocapsa muellerae | G. muellerae | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 19 | Gephyrocapsa oceanica | G. oceanica | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 20 | Gephyrocapsa spp. | Gephyrocapsa spp. | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | small |
| 21 | Hayaster perplexus | H. perplexus | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 22 | Helicosphaera carteri | H. carteri | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 23 | Helicosphaera pavimentum | H. pavimentum | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 24 | Oolithotus fragilis | O. fragilis | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 25 | Pontosphaera spp. | Pontosphaera spp. | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 26 | Pseudoemiliania lacunosa | P. lacunosa | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 27 | Reticulofenestra asanoi | R. asanoi | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 28 | Reticulofenestra sessilis | R. sessilis | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 29 | Reticulofenestra spp. | Reticulofenestra spp. | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 30 | Rhabdosphaera clavigera | R. clavigera | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 31 | Rhabdosphaera spp. | Rhabdosphaera spp. | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 32 | Scapholithus fossilis | S. fossilis | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 33 | Syracosphaera pulchra | S. pulchra | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 34 | Syracosphaera spp. | Syracosphaera spp. | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 35 | Umbilicosphaera sibogae | U. sibogae | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 36 | Umbilicosphaera hulburtiana | U. hulburtiana | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 37 | Umbellosphaera irregularis | U. irregularis | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 38 | Umbellosphaera tenuis | U. tenuis | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | |
| 39 | Coccoliths, other | Cocco oth | 106 #/g | Baumann, Karl-Heinz | Calculated, see reference(s) | Unknown |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
4699 data points
Download Data
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