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Glacial to deglacial reservoir ages of surface waters in the southern South Pacific
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  • Michael Sarnthein,
  • Kevin Küssner,
  • Frank Lamy,
  • Thomas Alexander Ronge,
  • Gesine Mollenhauer,
  • Ralf Tiedemann,
  • Elisabeth Michel,
  • Giuseppe Siani
Michael Sarnthein
Universitaet zu Kiel

Corresponding Author:[email protected]

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Kevin Küssner
Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research
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Frank Lamy
Alfred Wegener Institute for Polar and Marine Research
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Thomas Alexander Ronge
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
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Gesine Mollenhauer
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Ralf Tiedemann
Alfred Wegener Institute Bremerhaven
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Elisabeth Michel
Laboratoire des Sciences du Climat et de
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Giuseppe Siani
U Paris Sud
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Ocean sediment records document abrupt changes in glacial-to-deglacial circulation and mixing of the ocean, recorded as changes in 14C reservoir ages of surface waters.
Here we present 14C-based high-resolution age records of four sediment cores derived by means of 14C plateau tuning. This provides a detailed and precise stratigraphic correlation between the western and eastern South Pacific and paleoclimate records of Antarctic ice cores as well as 14C reservoir ages. The accuracy and precision of plateau tuning are confirmed in two sediment cores off Chile; in one core by independent land-based age control of four tephra layers, in a second core by a suite of glacial sediment varves. During glacial times, high reservoir ages reaching up to ~1500 yr may reflect
seasonal sea ice and/or a melt water lid at high latitudes both east of New Zealand and off southern Chile and may be linked to northward advection of upwelled old subsurface waters from the Polar Frontal Zone. Our results support the model of a bipolar seesaw at the onset of rapid deglacial Antarctic warming, moreover, they show that the Antarctic Cold Reversal immediately preceded the onset of the Younger Dryas cold spell.