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PALEOCEANOGRAPHY

Equatorial Pacific Planktonic Foraminifera Carbon and Oxygen Isotope Data

Map of data site
Spero, H.J., and D.W. Lea. 2002. The cause of carbon isotope minimum events on glacial terminations. Science 296:522-525.
Data Coverage North: 2.25 * South: 2.25
West: -90.95 * East: -90.95
Altitude: -2348 m

Start Year: 150000 14C yr BP * End Year: 1100 14C yr BP

Data:     Please Cite Data Contributors!
  spero2002
  t16319sp-tab.txt

Summary:

The occurrence of carbon isotope minima at the beginning of glacial terminations is a common feature of planktic foraminifera carbon isotopic records from the Indo-Pacific, sub-Antarctic, and South Atlantic. We use the delta 13C record of a thermocline-dwelling foraminifera, Neogloboquadrina dutertrei, and surface temperature estimates from the eastern equatorial Pacific to demonstrate that the onset of delta 13C minimum events and the initiation of Southern Ocean warming occurred simultaneously. Timing agreement between the marine record and the delta 13C minimum in an Antarctic atmospheric record suggests that the deglacial events were a response to the breakdown of surface water stratification, renewed Circumpolar Deep Water upwelling, and advection of low delta 13C waters to the convergence zone at the sub-Antarctic front. On the basis of age agreement between the absolute delta 13C minimum in surface records and the shift from low to high delta 13C in the deep South Atlantic, we suggest that the delta 13C rise that marks the end of the carbon isotope minima was due to the resumption of North Atlantic Deep Water influence in the Southern Ocean.
More Info on Paleoceanography Data

Parameters:

radiocarbon years before 1950AD; delta C13 PDB (Neogloboquadrina dutertrei >500 micron); delta C13 PDB (Globigerinoides ruber 250-355 micron); delta O18 PDB (Neogloboquadrina dutertrei >500 micron)

Complete XML Record:

noaa-ocean-2583  (Last Revised: 2008-04-10 )

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