Extension of the stable oxygen isotope and density profile of the B26 ice core ...

• Main Authors: Vinther, Bo Møllesøe, Freitag, Johannes, Kipfstuhl, Sepp, Weißbach, Stefanie, Karlsson, Nanna Bjørnholt, Münch, Thomas, Hörhold, Maria
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2022
• Subjects: density; firn core; North Greenland Traverse; stable water isotopes; Firn corer; Glaciology @ AWI AWI_Glac; North Greenland Eemian Ice Drilling NEEM; Polar Terrestrial Environmental Systems @ AWI AWI_Envi; Greenland; ice core; North Greenland
• Online Access: https://dx.doi.org/10.1594/pangaea.945670; https://doi.pangaea.de/10.1594/PANGAEA.945670

The firn core array of the North Greenland Traverse (NGT) provides unique climatic information for North Greenland until the mid 1990ies. In order to extend this climate record into more recent time, some of the drill sites were revisited and extension cores were drilled. The record is a composite of snow liners (from the surface to 1.29 m depth) and a consecutive firn core from 1.47 m depth to 30.00 m depth with a diameter of 75 cm. Density was measured by weighing the 55 cm long bags. Stable oxygen isotopes (δ18O) were measured at the Niels Bohr Institute, Copenhagen, Denmark. Using raw, un-calibrated dielectrical profiling (DEP) data from the field (NEEM Set-up), volcanic tie points were derived. Together with the smoothed density data and the isotopic composition the record was dated by layer counting. The annual mean values of δ18O were obtained based on this dating. Based on the density measurements and the dating, the annual accumulation rate in water equivalent depth was derived. ... : This data set belongs to the data sets of firn cores B18_2012, B21_2012, B23_2012 and NGRIP_2012. ...