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08 Feb 2008
Status : this preprint was under review for the journal CP but the revision was not accepted.
An improved method for delta 15 N measurements in ice cores
F. S. Mani , P. Dennis , W. T. Sturges , R. Mulvaney , and M. Leuenberger
The use of isotopic ratios of nitrogen gas (δ15 N) trapped in ice cores as a paleothermometer to characterise abrupt climate changes is becoming a widespread technique. The versatility of the technique could be enhanced, for instance in quantifying small temperature changes during the last glacial period in Antarctic ice cores, by using high precision methods. In this paper, we outline a method for measuring δ15 N to a precision of 0.006\permil (1σ, n=9) from replicate ice core samples. The high precision results from removing oxygen, carbon dioxide and water vapour from the air extracted from ice cores. The advantage of the technique is that it does not involve correction for isobaric interference due to CO+ ions. We also highlight the importance of oxygen removal from the sample, and how it influences δ15 N measurements. The results show that a small amount of oxygen in the sample can be detrimental to achieving an optimum precision in δ15 N measurements of atmospheric nitrogen trapped ice core samples.
Received: 20 Dec 2007 – Discussion started: 08 Feb 2008
Publisher's note : Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
F. S. Mani , P. Dennis , W. T. Sturges , R. Mulvaney , and M. Leuenberger
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Status: closed
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Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
F. S. Mani , P. Dennis , W. T. Sturges , R. Mulvaney , and M. Leuenberger
F. S. Mani , P. Dennis , W. T. Sturges , R. Mulvaney , and M. Leuenberger
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