(Table 1) Radionuclide content in ODP Hole 108-658C

DOI

Using a high-resolution 230Th normalized record of sediment flux, we document the deglacial and Holocene history of North African aridity and coastal upwelling at Ocean Drilling Program Hole 658C. At both the end of the Younger Dryas and after the 8.2 ka event, there are significant drops in terrigenous accumulation at our site, indicating an increase in the monsoon moisture flux over Africa at this time. At 5.5 ka, there is an abrupt end to the "African humid period" and a return to stronger upwelling conditions. For carbonate and opal fluxes the 230Th normalization completely changes the shape of each record based on percentage variations alone. This site is a clear example of how variations in one sediment component can obscure changes in the others, and it demonstrates the need for radionuclide measurements more generally in paleoceanography. By taking our new records and a large amount of previous data from this site we conclude that increases in African moisture are tightly coupled to decreases in coastal upwelling intensity.

Supplement to: Adkins, Jess F; deMenocal, Peter B; Eshel, Gidon (2006): The “African humid period” and the record of marine upwelling from excess 230Th in Ocean Drilling Program Hole 658C. Paleoceanography, 21(4), PA4203

Identifier
DOI https://doi.org/10.1594/PANGAEA.833739
Related Identifier https://doi.org/10.1029/2005PA001200
Related Identifier https://doi.org/10.1029/2006PA001388
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.833739
Provenance
Creator Adkins, Jess F ORCID logo; deMenocal, Peter B (ORCID: 0000-0002-7191-717X); Eshel, Gidon
Publisher PANGAEA
Publication Year 2006
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 992 data points
Discipline Earth System Research
Spatial Coverage (-18.581 LON, 20.749 LAT); Canarias Sea
Temporal Coverage Begin 1986-03-08T00:45:00Z
Temporal Coverage End 1986-03-08T16:00:00Z