First absolute seasonal temperature estimates for greenhouse climate from clumped isotopes in bivalve shells

Niels De Winter, Inigo Müller, Ilja Kocken, Nicolas Thibault, Clemens Vinzenz Ullmann, Alexander Farnsworth, Daniel Lunt, Philippe Claeys, Martin Ziegler

Research output: Other contribution

Abstract

The seasonal variability of sea surface temperatures plays a fundamental role in climate dynamics and species distribution. As such, it is essential to better understand seasonal variability in warm climates of the past. Previous reconstructions of seasonality in deep time are relatively unconstrained, relying on unsupported assumptions such as estimates of seawater composition and negligible seasonal bias. This work presents the first absolute seasonal temperature reconstructions based on clumped isotope measurements in bivalve shells which, critically, do not rely on these assumptions. Our new approach reconstructs highly precise mid-latitude (~50°N) monthly temperatures from individual oyster and rudist shells of the Campanian (78 million years ago) greenhouse period (15—27 °C seasonal range). Our analysis demonstrates that seasonal bias and previous assumptions about sea water oxygen isotope composition can lead to highly inaccurate temperature reconstructions, distorting our understanding of the behavior of greenhouse climates and our ability to model them. Our results agree remarkably well with fully coupled climate model simulations showing greenhouse climates outside the tropics were warmer with higher seasonality than previously thought.
Original languageUndefined/Unknown
TypePreprint in review of manuscript titled "First absolute seasonal temperature estimates for greenhouse climate from clumped isotopes in bivalve shells"
Media of outputnone
Number of pages26
DOIs
Publication statusPublished - 18 Nov 2020

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