How can researchers date Antarctica’s oldest ice?
Wolff and colleagues propose comparing future deep ice-core measurements with dated marine records to build age models reaching toward 1.5 million years. Their approach uses relationships among water isotopes, ocean temperatures and dust or iron records.
Wolff, Fischer, van Ommen and Hodell (2022), Climate of the Past 18, 1563–1577, Figure 1. DOI: 10.5194/cp-18-1563-2022. Location map made with GeoMapApp (Ryan et al., 2009), as credited in the figure caption.
CC BY 4.0; article and original Figure 1 retained with attribution.
Scope and limitations
A methods proposal, not a newly recovered 1.5-million-year climate record. Extending correlations beyond 800,000 years requires assumptions; the paper also identifies unresolved issues with beryllium-10 comparisons. Its figure is a map of study locations, not an isotope time series.