FIGURE 1. Methane records and EPICA/Dome C deltaD.

From the following article:

Orbital and millennial-scale features of atmospheric CH4 over the past 800,000 years

Laetitia Loulergue, Adrian Schilt, Renato Spahni, Valérie Masson-Delmotte, Thomas Blunier, Bénédicte Lemieux, Jean-Marc Barnola, Dominique Raynaud, Thomas F. Stocker & Jérôme Chappellaz

Nature 453, 383-386(15 May 2008)

doi:10.1038/nature06950

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Bottom to top: deltaD record9; EDC methane record (previously published data2, black diamonds; new data from LGGE, red diamonds; new data from Bern, blue dots); Vostok methane record1. Marine Isotope Stage numbering is given at the bottom of each interglacial. Insert: expanded view of the bottom section of EDC: deltaD values9 (black line), CH4 (black line) from EDC and stack benthic delta18O values (blue line)19 for the period from MIS 16 to 20.2, on their respective age scales. delta18O = [ (18O/16O)sample/(18O/16O)standard]  – 1, where standard is vPDB; deltaD = [ (D/H)sample/(D/H)standard]  – 1 where standard is SMOW.

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