The "African humid period" and the record of marine upwelling from excess Th-230 in Ocean Drilling Program Hole 658C

Publication Status is "Submitted" Or "In Press: 
Yes
LDEO Publication: 
Yes
Publication Type: 
Year of Publication: 
2006
Editor: 
Journal Title: 
Paleoceanography
Journal Date: 
Oct 20
Place Published: 
Tertiary Title: 
Volume: 
21
Issue: 
4
Pages: 
-
Section / Start page: 
Publisher: 
ISBN Number: 
0883-8305
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000241698000001
LDEO Publication Number: 
Call Number: 
Abstract: 

[ 1] Using a high-resolution Th-230 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 Th-230 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.

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100VPTimes Cited:5Cited References Count:57

DOI: 
Doi 10.1029/2005pa001200