We present the SP19 gas chronology for the South Pole ice core.  The chronology is based on stratigraphic matching of abrupt methane (CH4) changes.  To construct the chronology, abrupt changes in CH4 during the glacial period and small, 20-30ppb, centennial scale changes in CH4 were used with analogous data from the West Antarctic Ice Sheet Divide ice core.  Stratigraphic matching was verified by an optimization algorithm.  The ages cover the last 52,586 years.  Absolute uncertainty increases with depth until ± 540 years.

1643394 Buizert, Christo, 1443472 Brook, Edward, 1804154 Sowers, Todd, 1142517 Aydin, Murat, 1443470 Aydin, Murat, 1443397 Kreutz, Karl, 1443710 Severinghaus, Jeffrey, 1443105 Steig, Eric, 1141839 Steig, Eric, 1443464 Sowers, Todd

Antarctic Glaciology, Antarctic Glaciology, Antarctic Glaciology, Antarctic Glaciology, Antarctic Glaciology, Antarctic Glaciology, Antarctic Glaciology, Antarctic Glaciology, Antarctic Glaciology, Antarctic Ocean and Atmospheric Sciences