(Table 1) Gas tie points used to correlate the ice cores NGRIP and EDML ...

• Main Authors: Capron, Emilie, Landais, Amaëlle, Lemieux-Dudon, Bénédicte, Schilt, Adrian, Masson-Delmotte, Valerie, Buiron, Daphné, Chappellaz, Jérôme A, Dahl-Jensen, Dorthe, Johnsen, Sigfús Jóhann, Leuenberger, Markus Christian, Loulergue, Laetitia, Oerter, Hans
• Format: Dataset
• Language: English
• Published: PANGAEA 2010
• Subjects: ipy; DEPTH, ice/snow; Depth, reference; Gas age; Age, comment; Age, error; Ice drill; NGRIP; Sampling/drilling ice; European Project for Ice Coring in Antarctica EPICA; International Polar Year 2007-2008 IPY; North Greenland Ice Core Project NGRIP; Antarc*; Antarctic; Antarctica; Dronning Maud Land; EPICA; Greenland; Greenland ice core; Greenland Ice core Project; Greenland ice cores; ice core; International Polar Year; IPY; North Greenland; North Greenland Ice Core Project
• Online Access: https://dx.doi.org/10.1594/pangaea.786135; https://doi.pangaea.de/10.1594/PANGAEA.786135

Water isotope records from the EPICA Dronning Maud Land (EDML) and the NorthGRIP ice cores have revealed a one to one coupling between Antarctic Isotope Maxima (AIM) and Greenland Dansgaard-Oeschger (DO) events back to 50 kyr. In order to explore if this north–south coupling is persistent over Marine Isotopic Stage 5 (MIS 5), a common timescale must first be constructed.Here, we present new records of d18O of O2 (d18Oatm) and methane (CH4) measured in the air trapped in ice from the EDML (68–147 kyr) and NorthGRIP (70–123 kyr) ice cores. We demonstrate that, through the period of interest, CH4 records alone are not sufficient to construct a common gas timescale between the two cores. Millennial-scale variations of d18Oatm are evidenced over MIS 5 both on the Antarctic and Greenland ice cores and are coupled to CH4 profiles to synchronise the NorthGRIP and EDML records. They are shown to be a precious tool for ice core synchronisation.With this new dating strategy, we produce the first continuous and accurate ... : Gas tie points used to correlate NorthGRIP and EDML (EPICA Dronning Maud Land, Latitude: -75.002, Longitude: 0.068) records by minimizing the area between the NorthGRIP and EDML d18Oatm and CH4 records and associated uncertainties. Note that synchronisation uncertainties are minimal for DO events 19, 20 and 21 thanks to the use of d15N. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...