Coccolith species abundances in ODP Site 1082 of the past 750 ka in the region of the Benguela Current (BC) system

DOI

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.

Identifier
DOI https://doi.org/10.1594/PANGAEA.974777
Related Identifier References https://doi.org/10.1016/j.marmicro.2004.04.011
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.974777
Provenance
Creator Baumann, Karl-Heinz ORCID logo
Publisher PANGAEA
Publication Year 2025
Funding Reference German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID Ba 1648/1 Evolution of coccolithophores in the Southeast Atlantic (ODP Site 1082)
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 4699 data points
Discipline Earth System Research
Spatial Coverage (11.821 LON, -21.094 LAT); Benguela Current, South Atlantic Ocean