Open AccessThe “African humid period” and the record of marine upwelling from excess 230 Th in Ocean Drilling Program Hole 658C
Author(s) -
Adkins Jess,
deMenocal Peter,
Eshel Gidon
Publication year - 2006
Publication title -
paleoceanography
Language(s) - English
Resource type - Journals
eISSN - 1944-9186
pISSN - 0883-8305
DOI - 10.1029/2005pa001200
Subject(s) - upwelling , younger dryas , geology , oceanography , terrigenous sediment , monsoon , paleoceanography , holocene , period (music) , sediment , paleoclimatology , climatology , radiocarbon dating , paleontology , climate change , physics , acoustics
Using a high‐resolution 230 Th 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 230 Th 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.