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PALEOCEANOGRAPHY

Sargasso Sea Stable Isotope and Cd/Ca Data

Map of data site
Keigwin, L.D., and E.A. Boyle. 1999. Surface and deep ocean variability in the northern Sargasso Sea during marine isotope stage 3. Paleoceanography 14(2):164-170.
Data Coverage North: 33.68 * South: 33.68
West: -57.63 * East: -57.63
Altitude: -4583 m

Data:     Please Cite Data Contributors!
  keigwin1999
  gpc-5k-tab.txt
  md952036-tab.txt

Summary:

New geochemical proxy data from Bermuda Rise piston cores reveal ocean and climate conditions in the northern Sargasso Sea during marine isotope stage 3. Using d18O on the planktonic foraminifer Globigerinoides ruber, we can correlate explicitly with every stadial/interstadial change in Greenland ice between ~32 and 58 ka. These data suggest repetitive changes of ~4°C in the annual average sea surface temperature (SST), with maximum cooling comparable to or greater than SST during glacial maximum conditions. The extent of SST depression is about the same for typical stadial events and for Heinrich events 4 and 5, which we have identified on the Bermuda Rise by traces of ice rafting. Benthic foraminiferal d13C decreases during every stadial event, consistent with reduced production of the deepest component of North Atlantic Deep Water and shoaling of its interface with Antarctic Bottom Water. This interpretation is supported by benthic Cd/Ca data from the climate cycle associated with interstadial 8.
More Info on Paleoceanography Data

Parameters:

Ice Rafted Debris (>150um) count; delta O18 PDB (Globigerinoides ruber); Nuttalides Umbonifera per gram; Cibicidoides sp.; delta C13 PDB (Nuttalides umbonifera); Cadmium/Calcium ratio (Nuttalides umbonifera); Nuttalides Umbonifera; Cibicidoides sp. per gram; delta C13 PDB (Globigerinoides ruber); Cadmium/Calcium ratio (Melonis barleanum); delta C13 PDB (Cibicidoides spp.); Dry Bulk Density (g/cm^3); Cadmium/Calcium ratio (Uvigerina sp.); Ice Rafted Debris per gram; delta O18 PDB (Nuttalides umbonifera); delta O18 PDB (Cibicidoides spp.)

Complete XML Record:

noaa-ocean-2596  (Last Revised: 2007-12-21 )

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