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\begin{document}

\title{Evolution of Sea Surface Temperature in the Southern Mid-latitudes from
Late Oligocene through Early Miocene}



\author[1,1]{José Guitián}%
\author[1,1]{Heather Stoll}%
\affil[1]{ETH Zurich}%


\vspace{-1em}



  
  \date{June 17, 2024}


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\begin{abstract}
Large Antarctic ice volume changes characterized the middle to Late
Oligocene and the first million years of climate evolution during the
Miocene. However, the sea surface temperature (SST) evolution over this
period remains poorly constrained, as only a few records from
contrasting proxies are available. In this study, we present a long-term
alkenone-derived SST record from sediments drilled by the Ocean Drilling
Program (ODP) at Site 1168 in the west Tasmanian Sea spanning 29.8 Ma to
16.7 Ma. The SST record highlight that the long-term warming in the Late
Oligocene linked to the end of the Middle Oligocene Glacial Interval can
be recognized also at mid-to-high latitudes of the Southern Hemisphere.
Warmer average temperatures (25.5\selectlanguage{ngerman}°C) characterize the period from 24.6
to 22 Ma; average temperatures then decrease by 1 to 2°C into the
Miocene and stabilize by 20.1 Ma. The reconstructed temperatures are
highly variable in the warm Late Oligocene waters, and more stable and
slightly colder in the Early to Middle Miocene. We confirm that this
temperature trend is not an artefact of the latitudinal drift of the
site, as the temperature anomaly relative to the modern water
temperature at the paleolocation confirms the SST trends of the
Oligocene. This is the first alkenone-derived record to reproduce the
long-term Oligocene climate trend previously interpreted from the
benthic \selectlanguage{greek}δ\selectlanguage{english}18O, which recorded a warming and/or reduction in ice volume
from the Middle Oligocene Glacial Interval through the latest Oligocene.%
\end{abstract}%



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