Mapping of C4 plant input from North West Africa into North East Atlantic sediments, supplement to: Huang, Yongsong; Dupont, Lydie M; Sarnthein, Michael; Hayes, John M; Eglinton, Geoffrey (2000): Mapping of C4 plant input from North West Africa into North East Atlantic sediments. Geochimica et Cosmochimica Acta, 64(20), 3505-3513

DOI

Mapping the abundance of 13C in leaf-wax components in surface sediments recovered from the seafloor off northwest Africa (0–35°N) reveals a clear pattern of delta13C distribution, indicating systematic changes in the proportions of terrestrial C3 and C4 plant input. At 20°N latitude, we find that isotopically enriched products characteristic of C4 plants account for more than 50% of the terrigenous inputs. This signal extends westward beneath the path of the dust-laden Sahara Air Layer (SAL). High C4 contributions, apparently carried by January trade winds, also extend far into the Gulf of Guinea. Similar distributions are obtained if summed pollen counts for the Chenopodiaceae-Amaranthaceae and the Poaceae are used as an independent C4 proxy. We conclude that the specificity of the latitudinal distribution of vegetation in North West Africa and the pathways of the wind systems (trade winds and SAL) are responsible for the observed isotopic patterns observed in the surface sediments. Molecular-isotopic maps on the marine-sedimentary time horizons (e.g., during the last glacial maximum) are thus a robust tool for assessing the phytogeographic changes on the tropical and sub-tropical continents, which have important implications for the changes in climatic and atmospheric conditions.

Identifier
DOI https://doi.org/10.1594/PANGAEA.692076
Related Identifier https://doi.org/10.1016/S0016-7037(00)00445-2
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.692076
Provenance
Creator Huang, Yongsong; Dupont, Lydie M; Sarnthein, Michael; Hayes, John M; Eglinton, Geoffrey
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2000
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Representation
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 2 datasets
Discipline Earth System Research
Spatial Coverage (-29.000W, -2.203S, 15.890E, 41.570N); Northeast Atlantic; East Atlantic; Atlantic Ocean; Equatorial Atlantic; off Guinea; eastern Romanche Fracture Zone; Sierra Leone Basin/Guinea Basin; off Liberia; off Cote d Ivoire; off Ghana; off Nigeria-Delta; off Gabun; Cervaro river
Temporal Coverage Begin 1971-01-01T00:00:00Z
Temporal Coverage End 1990-10-13T00:00:00Z