Preprints
https://doi.org/10.5194/essd-2025-364
https://doi.org/10.5194/essd-2025-364
01 Jul 2025
 | 01 Jul 2025
Status: this preprint is currently under review for the journal ESSD.

A database of databases for Common Era paleoclimate applications

Michael N. Evans, Lucie J. Lücke, Kevin J. Fan, and Feng Zhu

Abstract. We present a database of curated databases (DoD2k version 1) developed for Common Era (1–2000 A.D.) paleoclimate research. The DoD2k leverages existing community efforts, many of which arise from the PAGES (Past Global Changes) 2k working group, and the codebase developed by the paleoclimate data informatics communities over the past decade. Using a common, compact set of terms for metadata and data management, we merge five existing curated databases. These individual curated databases represent a range of approaches, from single archive-single observation to multiarchive-multiobservation collections, and span a total of 14 archives, 49 data types, and 4613 records within the Common Era. We then use a multistage algorithm to remove duplicates, checking against a common set of metadata and comparison metrics. We illustrate the value of the DoD2k with two applications. In the first, we extract the moisture and temperature subset of records and perform an empirical orthogonal function (EOF) analysis on the resulting multi-archive, multi-observation dataset. In the second, we show that calcite speleothem oxygen isotopic composition is consistent with proxy system simulations. DoD2k may also be useful for paleoclimatic detection and attribution analysis using proxy system modeling, data assimilation, and deep learning for the development and testing of improved proxy system models.

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Michael N. Evans, Lucie J. Lücke, Kevin J. Fan, and Feng Zhu

Status: open (until 28 Aug 2025)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
Michael N. Evans, Lucie J. Lücke, Kevin J. Fan, and Feng Zhu

Data sets

DoD2k Database of Databases for Common Era Paleoclimatology Michael N. Evans et al. https://doi.org/10.25921/sptp-g618

Interactive computing environment

DoD2k compile proxy database Python functions and Jupyter notebooks Lucie J. Luecke https://zenodo.org/records/15676256

Michael N. Evans, Lucie J. Lücke, Kevin J. Fan, and Feng Zhu

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Short summary
We present a database of databases (DoD2k) for Common Era (1–2000 A.D.) paleoclimate research. The DoD2k leverages existing code and 5 curated databases, eliminates duplicates, and contains 4613 records. We analyze for common features across moisture and temperature sensitive records, and we test cave carbonate data simulations against observations. DoD2k is expected to be useful for detecting climate change on decadal timescales and for improving data models and paleoclimate reconstructions.
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