Carbon-13 isotopic composition of atmospheric methane across Heinrich Stadials 1 and 5, and Dansgaard Oesgher Event 12, WAIS Divide Ice Core, Antarctica

This dataset includes ~60-year resolution measurements of the Carbon-13 isotopic Composition of Atmospheric Methane (δ13C-CH4) of gas bubbles from the WAIS Divide Ice Core. All measurements were made at the Oregon State University Ice Core and Quaternary Geochemistry Laboratory (Corvallis, OR) using a new methane stable isotope analytical system. The data includes depth-adjacent replicate samples (separated by no more than 0.3m of depth) and is split up into two sheets for the two different intervals measured (Heinrich Stadial 1 and Heinrich Stadial 5 / Dansgaard Oeschger Event 12). The data are displayed as a function of WAIS Divide depth and were corrected for gravitational and diffusional fractionation that occurs in the firn column according to Buizert et al., 2013. 1-sigma measurement uncertainty is also included and is determined from analytical uncertainty and uncertainties associated with diffusional and gravitational fractionation.

The manuscript presenting and analyzing these data is in preparation for publication as of April 2023.