Stable oxygen and carbon isotopes ratios of sediment core GeoB9528-3
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2009
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| author | Castañeda, Isla S Mulitza, Stefan Schefuß, Enno Lopes dos Santos, Raquel A Sinninghe Damsté, Jaap S Schouten, Stefan |
| author_facet | Castañeda, Isla S Mulitza, Stefan Schefuß, Enno Lopes dos Santos, Raquel A Sinninghe Damsté, Jaap S Schouten, Stefan |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The carbon isotopic composition of individual plant leaf waxes (a proxy for C3 vs. C4 vegetation) in a marine sediment core collected from beneath the plume of Sahara-derived dust in northwest Africa reveals three periods during the past 192,000 years when the central Sahara/Sahel contained C3 plants (likely trees), indicating substantially wetter conditions than at present. Our data suggest that variability in the strength of Atlantic meridional overturning circulation (AMOC) is a main control on vegetation distribution in central North Africa, and we note expansions of C3 vegetation during the African Humid Period (early Holocene) and within Marine Isotope Stage (MIS) 3 (approx. 50-45 ka) and MIS 5 (approx. 120-110 ka). The wet periods within MIS 3 and 5 coincide with major human migration events out of sub-Saharan Africa. Our results thus suggest that changes in AMOC influenced North African climate and, at times, contributed to amenable conditions in the central Sahara/Sahel, allowing humans to cross this otherwise inhospitable region. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_729198 |
| institution | PANGAEA |
| language | en |
| publishDate | 2009 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable oxygen and carbon isotopes ratios of sediment core GeoB9528-3 Castañeda, Isla S Mulitza, Stefan Schefuß, Enno Lopes dos Santos, Raquel A Sinninghe Damsté, Jaap S Schouten, Stefan 313; GeoB9528-3; Gravity corer (Kiel type); M65/1; Meteor (1986); SL The carbon isotopic composition of individual plant leaf waxes (a proxy for C3 vs. C4 vegetation) in a marine sediment core collected from beneath the plume of Sahara-derived dust in northwest Africa reveals three periods during the past 192,000 years when the central Sahara/Sahel contained C3 plants (likely trees), indicating substantially wetter conditions than at present. Our data suggest that variability in the strength of Atlantic meridional overturning circulation (AMOC) is a main control on vegetation distribution in central North Africa, and we note expansions of C3 vegetation during the African Humid Period (early Holocene) and within Marine Isotope Stage (MIS) 3 (approx. 50-45 ka) and MIS 5 (approx. 120-110 ka). The wet periods within MIS 3 and 5 coincide with major human migration events out of sub-Saharan Africa. Our results thus suggest that changes in AMOC influenced North African climate and, at times, contributed to amenable conditions in the central Sahara/Sahel, allowing humans to cross this otherwise inhospitable region. |
| title | Stable oxygen and carbon isotopes ratios of sediment core GeoB9528-3 |
| topic | 313; GeoB9528-3; Gravity corer (Kiel type); M65/1; Meteor (1986); SL |
| url | https://doi.org/10.1594/PANGAEA.729198 |