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. 2014 Apr 21;111(19):6876–6881. doi: 10.1073/pnas.1320329111

Fig. 2.

Fig. 2.

Stratigraphic dating of Kr samples. Abbreviations are Oldest Dryas (OD), Bølling–Allerød (B-A), and Younger Dryas (YD). Measurements along the stratigraphically dated profiles (white dots) with Kr samples (black with age uncertainty). (A) Sample Kr-1, located on the main transect (Fig. 1). CH4 data from the EDML core, Antarctica (48). (B) Samples Kr-2 and 4, located on the along-flow profile. δ18Oatm data from the Siple Dome core, Antarctica (45). (C) Sample Kr-3, located on the downstream transect. δ18Oatm (δ18O of atmospheric O2) data are from EDML (46) and CH4 data are from EPICA Dome C (47). The apparent phase shift between the CH4 and δ18Oatm rise across the penultimate deglaciation is mainly a function of the large difference in the atmospheric lifetime of CH4 and O2 (45). Taylor Glacier transect positions have been corrected for the isochrone dip angle (Dataset S1). Taylor Glacier CH4 and δ18Oatm data are not shown for the along-flow and main transects, respectively, as they do not provide a strong age constraint.