MULTICHRON - Constraining modeled multidecadal climate variability in the Atlantic using proxies derived from marine bivalve shells and coralline algae



 Jan 2018   2019   2020  2021



multichron shells web
Arctica islandica shells from the Faroe shelf. Credit: Carin Andersson Dahl.

MULTICHRON is a community-based effort investigating the multidecadal signal in North Atlantic sclerochronological records. This initiative builds on a number of ongoing and recently ended sclerochronological projects.

The PAGES MULTICHRON project is creating a data set of annually resolved records from high northern latitudes. Understanding natural climate variability and its driving factors (both external forcings and internal feedback processes) is crucial for the robust assessment of future climate change in a high-CO2 world.

Several studies have linked multidecadal variability to oscillations in the oceans, large-scale circulation patterns, and atmospheric dynamics, but also to variations in the external climate forcing. Robust proxy-based reconstructions of past environmental conditions can provide a crucial test of model performance over a wider range of conditions and a larger period of time than is possible with instrumental records alone. In particular, large challenges still exist in terms of understanding and modeling decadal to multidecadal variability.

The primary goal of this project is to identify and investigate key mechanisms of multidecadal variability in the marine climate system of the NE Atlantic Ocean by integrating results from state-of-the-art climate model simulations with high-resolution (annual and better), paleoclimate reconstructions for the last few centuries derived from precisely-dated sclerochronological archives.

> MULTICHRON scientific goals



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