Diffuse spectral reflectance as a proxy for percent carbonate content in North Atlantic sediments

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1999
Editor: 
Journal Title: 
Paleoceanography
Journal Date: 
Apr
Place Published: 
Tertiary Title: 
Volume: 
14
Issue: 
2
Pages: 
171-186
Section / Start page: 
Publisher: 
ISBN Number: 
0883-8305
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000079325100007
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Call Number: 
Abstract: 

Diffuse reflectance records from Feni Drift in the North Atlantic faithfully record sediment percent carbonate. A high-resolution, reflectance-based age model for these sediments derived from an orbitally tuned age model for western equatorial Atlantic, Ceara Rise sediments was generated by spectral frequency mapping. Power spectra of the Feni Drift record indicate statistically significant sub-Milankovitch cyclicity at 7.6-8.4 and 4.8-6.1 kyr. We infer that these similar to 8 and similar to 5 kyr cycles document a linkage between North and equatorial Atlantic climate given our ability to correlate these records. These climate cycles influence Atlantic basin carbonate prior to the intensification of Northern Hemisphere glaciation and thus must arise from some portion of the climate system other than the dynamics of large ice sheets. The presence of these peaks, which could be related to equatorial clipped precession, implies a possible non-linear response to Milankovitch forcing.

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179KDTimes Cited:28Cited References Count:59

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