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\begin{document}

\title{Late Oligocene Precipitation Seasonality in East Asia Based on \selectlanguage{greek}δ\selectlanguage{english}13C
Profiles in Fossil Wood\selectlanguage{english}}



\author[1]{Jamie R. Vornlocher}%
\author[2]{William E. Lukens}%
\author[1]{Brian A Schubert}%
\author[3]{Cheng Quan}%
\affil[1]{University of Louisiana at Lafayette}%
\affil[2]{James Madison University}%
\affil[3]{Chang'an University}%


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  \date{June 11, 2024}


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\begin{abstract}
The wet summers and dry winters of monsoon systems in East Asia are a
first-order control on food and water security for a significant portion
of the global population today. The onset, characteristics, and drivers
of paleo-monsoonal conditions in East Asia, however, are debated.
Records from the Eocene suggest pronounced rainfall seasonality
consistent with monsoon rainfall across China, likely driven by
migrations of the Inter-Tropical Convergence Zone. Model simulations
indicate that modern-like monsoon circulation of China was established
by the early Miocene at the latest, but uncertainty remains due to a
paucity of proxy records from the Oligocene. Here we provide the first
annually resolved, quantitative estimates of precipitation from East
Asia during the Oligocene, based upon intra-annual variation in carbon
isotopes across growth rings of exquisitely preserved fossil wood from
southern China. We find a clear pattern of consistent, summer-dominated
precipitation with \textasciitilde{}4 times more precipitation in summer
than winter. These data demonstrate that by the late Oligocene,
precipitation patterns in East Asia had similar strength and seasonality
to modern conditions, which suggests the presence of an East Asian
Monsoon-style system prior to the Neogene.%
\end{abstract}%



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\textbf{Hosted file}

\verb`vornlocher et al oligocene monsoon_supporting info.docx`  available at \url{https://authorea.com/users/539616/articles/599964-late-oligocene-precipitation-seasonality-in-east-asia-based-on-%CE%B413c-profiles-in-fossil-wood}

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