At some GRIP/GISP2 sites near the summit of Greenland, annual snow and ice layers can be traced back more than 40,000 years, similar to counting tree rings.
Sources
- Greenland Ice-core Project/Greenland Ice Sheet Project 2 | geochronology | Britannica (britannica.com)
- https://www.academia.edu/20006997/Visual_stratigraphic_dating_of_the_GISP2_ice_core_Basis_reproducibility_and_application (academia.edu)
- https://climatechange.umaine.edu/gisp2/data/ajgow.html (climatechange.umaine.edu)
- https://cp.copernicus.org/articles/4/47/2008/ (cp.copernicus.org)
- https://essd.copernicus.org/articles/15/3351/2023/ (essd.copernicus.org)
- https://www.climate.gov/news-features/climate-tech/climate-core-how-scientists-study-ice-cores-reveal-earths-climate (climate.gov)
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