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\begin{document}

\title{A Coral Diagenesis and Physiology Framework for Improving Coral \selectlanguage{greek}δ\selectlanguage{english}18O
Paleoclimate Reconstructions\selectlanguage{english}}



\author[1]{Luis Gabriel Rodriguez}%
\author[1]{Alyssa R. Atwood}%
\author[2]{Kim Cobb}%
\author[3]{Hussein R Sayani}%
\author[3]{Pamela Ruth Grothe}%
\affil[1]{Florida State University}%
\affil[2]{Brown University}%
\affil[3]{Georgia Institute of Technology}%


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  \date{May 22, 2024}


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\selectlanguage{english}
\begin{abstract}
Reef-building corals provide seasonally resolved records of past climate
variability from the ocean via variations in their oxygen isotope
composition (\selectlanguage{greek}δ\selectlanguage{english}18O). However, a variety of non-climatic factors can
influence coral \selectlanguage{greek}δ\selectlanguage{english}18O including processes associated with coral
biomineralization and post-depositional alteration of the coral
skeleton, which add uncertainty to coral based paleoclimate
reconstructions. These uncertainties are especially large in mean
climate reconstructions developed from coral \selectlanguage{greek}δ\selectlanguage{english}18O values due to the
large variability that exists in mean skeletal \selectlanguage{greek}δ\selectlanguage{english}18O signatures. We
present a novel framework to minimize this uncertainty in mean coral
\selectlanguage{greek}δ\selectlanguage{english}18O records based on a regression model that uses four commonly
measured properties in coral skeletons and associated coral \selectlanguage{greek}δ\selectlanguage{english}18O
records. We test the ability of the model to reduce noise in a Holocene
climate reconstruction comprised of 37 coral \selectlanguage{greek}δ\selectlanguage{english}18O records from
Kiritimati in the equatorial Pacific. Up to 43\% of the variance in the
detrended Holocene dataset is accounted for by a combination of four
predictors: (1) mm-scale variability in a coral \selectlanguage{greek}δ\selectlanguage{english}18O record, (2) the
physical extent of diagenetic alteration, (3) coral extension rate, and
(4) the mean coral \selectlanguage{greek}δ\selectlanguage{english}13C value. Once these non-climatic artifacts are
removed from the reconstruction, the weighted variance of the Holocene
dataset is reduced by 46\% and the uncertainty in the trend of coral
\selectlanguage{greek}δ\selectlanguage{english}18O over time is reduced by 26\%. These results have important
implications for the climate interpretation of this Holocene data set.
This framework has the potential to improve other paleoclimate records
based on ensembles of coral \selectlanguage{greek}δ\selectlanguage{english}18O records.%
\end{abstract}%



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\textbf{Hosted file}

\verb`Scorecard_Manuscrupt_Rodriguez_020724.docx`  available at \url{https://authorea.com/users/745290/articles/717421-a-coral-diagenesis-and-physiology-framework-for-improving-coral-%CE%B418o-paleoclimate-reconstructions}

\textbf{Hosted file}

\verb`Scorecard_SuppMat_Rodriguez_020224.docx`  available at \url{https://authorea.com/users/745290/articles/717421-a-coral-diagenesis-and-physiology-framework-for-improving-coral-%CE%B418o-paleoclimate-reconstructions}

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