Abstract
We report high resolution measurements of the stable isotope ratios of ancient ice (δ18O, δD) from the North Greenland Eemian deep ice core (NEEM, 77.45° N, 51.06° E). The record covers the period 8–130 ky b2k (y before 2000) with a temporal resolution of ≈0.5 and 7 y at the top and the bottom of the core respectively and contains important climate events such as the 8.2 ky event, the last glacial termination and a series of glacial stadials and interstadials. At its bottom part the record contains ice from the Eemian interglacial. Isotope ratios are calibrated on the SMOW/SLAP scale and reported on the GICC05 (Greenland Ice Core Chronology 2005) and AICC2012 (Antarctic Ice Core Chronology 2012) time scales interpolated accordingly. We also provide estimates for measurement precision and accuracy for both δ18O and δD.
Highlights
Background & SummaryThe isotopic composition of ice from deep cores drilled on Greenland and Antarctica has traditionally been used as a proxy for past temperatures[1,2,3,4] offering a picture of past climate that extends as far as 120,000 y in the past[5] for the case of Greenland and 800,000 y for the case of Antarctica[6]
We report high resolution measurements of the stable isotope ratios of ancient ice (δ18O, δD) from the North Greenland Eemian deep ice core (NEEM, 77.45° N, 51.06° E)
Water isotope records can be used in order to resolve climatic signals at higher frequencies, investigate abrupt climate events, count annual layers for the purpose of ice core chronologies and extract paleoclimate information stored in their spectral signature[7,8,9,10,11,12,13,14]
Summary
The isotopic composition of ice from deep cores drilled on Greenland and Antarctica has traditionally been used as a proxy for past temperatures[1,2,3,4] offering a picture of past climate that extends as far as 120,000 y in the past[5] for the case of Greenland and 800,000 y for the case of Antarctica[6]. Water isotope records can be used in order to resolve climatic signals at higher frequencies, investigate abrupt climate events, count annual layers for the purpose of ice core chronologies and extract paleoclimate information stored in their spectral signature[7,8,9,10,11,12,13,14]. Spectroscopic techniques, typically in the near Infra-Red spectral region that allowed for quasi-simultaneous analysis of the three isotope ratios 2H/1H, 17O/16O and 18O/16O on the same water sample[20,21]. Commercial instruments using Cavity Enhanced Spectroscopic techniques allowed for routine simultaneous measurements of δ18O and δD using a greatly reduced amount of sample and with precision and accuracy comparable, if not better than that of IRMS22,23. The record includes significant past-climate events such as the 8.2 ky climatic transition, the last Glacial Termination, as well as the series of Glacial Stadial-Interstadials of the last 120 ky (GI-1, GS-1 to GI-25c, GS-26)[034]
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