Stability of North Atlantic water masses in face of pronounced climate variability during the Pleistocene
Figure S2: Unsmoothed benthic _18O records from seven Atlantic sites and one Pacific site, 846, correlated to the Shackleton et al. (1.424Mb)
Figure S3: Benthic _13C data plotted to age based on _18O correlations shown in Figure S2. (1.295Mb)
Raymo, Maureen E.
Oppo, Delia W.
Flower, Benjamin P.
Hodell, David A.
McManus, Jerry F.
Kleiven, Helga F.
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Geochemical profiles from the North Atlantic Ocean suggest that the vertical δ13C structure of the water column at intermediate depths did not change significantly between glacial and interglacial time over much of the Pleistocene, despite large changes in ice volume and iceberg delivery from nearby landmasses. The most anomalous δ13C profiles are from the extreme interglaciations of the late Pleistocene. This compilation of data suggests that, unlike today (an extreme interglaciation), the two primary sources of northern deep water, Norwegian-Greenland Sea and Labrador Sea/subpolar North Atlantic, had different characteristic δ13C values over most of the Pleistocene. We speculate that the current open sea ice conditions in the Norwegian-Greenland Sea are a relatively rare occurrence and that the high-δ13C deep water that forms in this region today is geologically unusual. If northern source deep waters can have highly variable δ13C, then this likelihood must be considered when inferring past circulation changes from benthic δ13C records.
Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 19 (2004): PA2008, doi:10.1029/2003PA000921.
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