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\begin{document}

\title{Glacial to deglacial reservoir ages of surface waters in the southern
South Pacific}



\author[1]{Michael Sarnthein}%
\author[2]{Kevin Küssner}%
\author[3]{Frank Lamy}%
\author[4]{Thomas Alexander Ronge}%
\author[5]{Gesine Mollenhauer}%
\author[6]{Ralf Tiedemann}%
\author[7]{Elisabeth Michel}%
\author[8]{Giuseppe Siani}%
\affil[1]{Universitaet zu Kiel}%
\affil[2]{Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research}%
\affil[3]{Alfred Wegener Institute for Polar and Marine Research}%
\affil[4]{Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung}%
\affil[5]{Alfred-Wegener-Institute}%
\affil[6]{Alfred Wegener Institute Bremerhaven}%
\affil[7]{Laboratoire des Sciences du Climat et de}%
\affil[8]{U Paris Sud}%


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  \date{June 14, 2024}


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\begin{abstract}
Ocean sediment records document abrupt changes in glacial-to-deglacial
circulation and mixing of the ocean, recorded as changes in
\textsuperscript{14}C reservoir ages of surface waters.

Here we present \textsuperscript{14}C-based high-resolution age records
of four sediment cores derived by means of \textsuperscript{14}C 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 \textsuperscript{14}C 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 \textasciitilde{}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.%
\end{abstract}%



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