Measuring stable isotopes of hydrogen and oxygen in ice by means of laser spectrometry: the Bølling transition in the Dye-3 (south Greenland) ice coreAnnals of Glaciology, 35, p. 125-130, 2002
R. van Trigt, H.A.J. Meijer and E.R. Th. Kerstel
Centre for Isotope Research (CIO), Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland.
Geofysisk Afdeling, Niels Bohr Instituttet for Astronomi, Fysik og Geofysik, Københavns Universitet
We report on the first application of a new technique in ice-core research, based on direct absorption infrared laser spectrometry (LS), for measuring 2H, 17O and 18O isotope ratios. The data are used to calculate the deuterium excess d (defined as δ2H - 8δ18O) for a section of the Dye-3 (south Greenland) deep ice core around the Bølling transition (14 500 BP). The precision of LS is slightly better than that of most traditional methods for deuterium, but not for the oxygen isotopes. The ability to measure δ17O is new and is used here to improve the precision of the δ18O determination. Still, the final precision for δ18O remains inferior to traditional isotope ratio mass spectrometry (IRMS). Therefore, deuterium excess was calculated from a combination of the LS and IRMS isotope determinations.