The Antarctic Ice Core Chronology 2023
The Antarctic Ice Core Chronology 2023 (AICC2023) by Marie Bouchet et al. refines EPICA Dome C ice core dating, reducing uncertainty to 900 years over 800,000 years. It diverges from AICC2012, emphasizing precise chronologies for climate research.
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The Antarctic Ice Core Chronology 2023 (AICC2023) is a new chronological framework and timescale for the EPICA Dome C ice core in Antarctica. This work by Marie Bouchet et al. presents highly resolved measurements covering the last five glacial-interglacial transitions, a new low-resolution total air content record, and absolute 81Kr ages. By incorporating novel orbital age markers and accurate firn modeling estimates, the AICC2023 chronology reduces the average uncertainty in the ice chronology from 1700 to 900 years over the last 800,000 years. The new timescale diverges from AICC2012, suggesting age shifts towards older ages over specific marine isotope stages. However, the coherence between AICC2023 and independent chronologies of other archives is improved over certain time intervals. The study highlights the importance of precise chronologies in deep polar ice cores to understand past climate variations and their mechanisms, emphasizing the significance of ongoing efforts to enhance and extend these timescales.
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