Coccolith species abundances in ODP Site 1082 of the past 750 ka in the region of the Benguela Current (BC) system
Fuente:
PANGAEA
Guardado en:
| Autor principal: | |
|---|---|
| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
2025
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1867168232095350784 |
|---|---|
| author | Baumann, Karl-Heinz |
| author_facet | Baumann, Karl-Heinz |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_974777 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Coccolith species abundances in ODP Site 1082 of the past 750 ka in the region of the Benguela Current (BC) system Baumann, Karl-Heinz 175-1082; AGE; Algirosphaera spp.; Area; Benguela Current, South Atlantic Ocean; Calcidiscus leptoporus; Calcidiscus quadriperforatus; Calculated, see reference(s); coccolith abundances; Coccoliths; Coccoliths, other; Coccoliths, total; Coccolithus pelagicus; COMPCORE; Composite Core; Counting; DEPTH, sediment/rock; Emiliania huxleyi; Filter, area; Florisphaera profunda; Gephyrocapsa caribbeanica; Gephyrocapsa muellerae; Gephyrocapsa oceanica; Gephyrocapsa spp.; Gladiolithus flabellatus; Hayaster perplexus; Helicosphaera carteri; Helicosphaera pavimentum; Joides Resolution; Leg175; Namibia upwelling; Ocean Drilling Program; ODP; Oolithotus fragilis; Pontosphaera spp.; Pseudoemiliania lacunosa; Quaternary; Reticulofenestra asanoi; Reticulofenestra sessilis; Reticulofenestra spp.; Rhabdosphaera clavigera; Rhabdosphaera spp.; Sample code/label; Sample mass; Scapholithus fossilis; Southeast Atlantic; Split factor; Syracosphaera pulchra; Syracosphaera spp.; Umbellosphaera irregularis; Umbellosphaera tenuis; Umbilicosphaera hulburtiana; Umbilicosphaera sibogae 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. |
| title | Coccolith species abundances in ODP Site 1082 of the past 750 ka in the region of the Benguela Current (BC) system |
| topic | 175-1082; AGE; Algirosphaera spp.; Area; Benguela Current, South Atlantic Ocean; Calcidiscus leptoporus; Calcidiscus quadriperforatus; Calculated, see reference(s); coccolith abundances; Coccoliths; Coccoliths, other; Coccoliths, total; Coccolithus pelagicus; COMPCORE; Composite Core; Counting; DEPTH, sediment/rock; Emiliania huxleyi; Filter, area; Florisphaera profunda; Gephyrocapsa caribbeanica; Gephyrocapsa muellerae; Gephyrocapsa oceanica; Gephyrocapsa spp.; Gladiolithus flabellatus; Hayaster perplexus; Helicosphaera carteri; Helicosphaera pavimentum; Joides Resolution; Leg175; Namibia upwelling; Ocean Drilling Program; ODP; Oolithotus fragilis; Pontosphaera spp.; Pseudoemiliania lacunosa; Quaternary; Reticulofenestra asanoi; Reticulofenestra sessilis; Reticulofenestra spp.; Rhabdosphaera clavigera; Rhabdosphaera spp.; Sample code/label; Sample mass; Scapholithus fossilis; Southeast Atlantic; Split factor; Syracosphaera pulchra; Syracosphaera spp.; Umbellosphaera irregularis; Umbellosphaera tenuis; Umbilicosphaera hulburtiana; Umbilicosphaera sibogae |
| url | https://doi.org/10.1594/PANGAEA.974777 |