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Article
North Atlantic Intermediate to Deep Water Circulation and Chemical Stratification During the Past 1 Myr
Paleoceanography
  • Benjamin P. Flower, University of South Florida
  • D. W. Oppo, Woods Hole Oceanographic Institution
  • J. F. McManus, Woods Hole Oceanographic Institution
  • K. A. Venz, University of Florida
  • D. A. Hodell, University of Florida
  • J. L. Cullen, Salem Stale University
Document Type
Article
Publication Date
8-1-2000
Digital Object Identifier (DOI)
dx.doi.org/10.1029/1999PA000430
Disciplines
Abstract
Benthic foraminiferal carbon isotope records from a suite of drill sites in the North Atlantic are used to trace variations in the relative strengths of Lower North Atlantic Deep Water (LNADW), Upper North Atlantic Deep Water (UNADW), and Southern Ocean Water (SOW) over the past 1 Myr. During glacial intervals, significant increases in intermediate-to-deep delta(13)C gradients (commonly reaching >1.2 parts per thousand) are consistent with changes in deep water circulation and associated chemical stratification. Bathymetric delta(13)C gradients covary with benthic foraminiferal delta(18)O and covary inversely with Vostok CO2, in agreement with chemical stratification as a driver of atmospheric CO2 changes. Three deep circulation indices based on delta(13)C show a phasing similar to North Atlantic sea surface temperatures, consistent with a Northern Hemisphere control of NADW/SOW variations. However, lags in the precession band indicate that factors other than deep water circulation control ice volume variations at least in this band.
Citation / Publisher Attribution

Paleoceanography, v. 15, no. 4, p. 388-403.

Citation Information
Benjamin P. Flower, D. W. Oppo, J. F. McManus, K. A. Venz, et al.. "North Atlantic Intermediate to Deep Water Circulation and Chemical Stratification During the Past 1 Myr" Paleoceanography Vol. 15 Iss. 4 (2000) p. 388 - 403
Available at: http://works.bepress.com/benjamin_flower/1/