Visual Stratigraphy-Based Age Scale Developed for the Shallow Mount Siple Firn Core, Antarctica
Here we present a case study for using visual stratigraphy to date a shallow firn core from coastal West Antarctica. The Mount Siple ice core has the potential to reconstruct climate in this data-sparse region over recent decades. Line scanned images of the 24 m firn core were used to generate a grey-scale, which displays variability consistent with annual cycles. The resulting Mount Siple age scale spans from 1998 ± 1 to 2017 CE. This study demonstrates that the seasonal changes in the grey-scale record provide an independent method of dating firn cores. However, the presence of melt layers at this site has introduced an error of ±1 year. Visual line stratigraphy has the unique advantage over traditional annual layer counting, based on chemical or isotopic species, of being non-destructive and relatively inexpensive. Visual line stratigraphy has proved to be an effective dating method for this site.
Authors: Brown, Joseph W., Moser, Dorothea E. ORCID record for Dorothea E. Moser, Emanuelsson, Daniel B. ORCID record for Daniel B. Emanuelsson, Thomas, Elizabeth R. ORCID record for Elizabeth R. Thomas