An improved method for delta 15N measurements in ice cores
The use of isotopic ratios of nitrogen gas (δ15N) 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 pe...
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fttriple:oai:gotriple.eu:10670/1.8dl2wp 2023-05-15T13:42:16+02:00 An improved method for delta 15N measurements in ice cores Mani, F. S. Dennis, P. Sturges, W. T. Mulvaney, R. Leuenberger, M. 2018-09-26 https://doi.org/10.5194/cpd-4-149-2008 https://cp.copernicus.org/preprints/cpd-2007-0048/ en eng doi:10.5194/cpd-4-149-2008 10670/1.8dl2wp https://cp.copernicus.org/preprints/cpd-2007-0048/ undefined Geographica Helvetica - geography eISSN: 1814-9332 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2018 fttriple https://doi.org/10.5194/cpd-4-149-2008 2023-01-22T18:39:33Z The use of isotopic ratios of nitrogen gas (δ15N) 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 δ15N to a precision of 0.006permil (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 δ15N measurements. The results show that a small amount of oxygen in the sample can be detrimental to achieving an optimum precision in δ15N measurements of atmospheric nitrogen trapped ice core samples. Text Antarc* Antarctic ice core Unknown Antarctic |
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envir geo Mani, F. S. Dennis, P. Sturges, W. T. Mulvaney, R. Leuenberger, M. An improved method for delta 15N measurements in ice cores |
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description |
The use of isotopic ratios of nitrogen gas (δ15N) 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 δ15N to a precision of 0.006permil (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 δ15N measurements. The results show that a small amount of oxygen in the sample can be detrimental to achieving an optimum precision in δ15N measurements of atmospheric nitrogen trapped ice core samples. |
format |
Text |
author |
Mani, F. S. Dennis, P. Sturges, W. T. Mulvaney, R. Leuenberger, M. |
author_facet |
Mani, F. S. Dennis, P. Sturges, W. T. Mulvaney, R. Leuenberger, M. |
author_sort |
Mani, F. S. |
title |
An improved method for delta 15N measurements in ice cores |
title_short |
An improved method for delta 15N measurements in ice cores |
title_full |
An improved method for delta 15N measurements in ice cores |
title_fullStr |
An improved method for delta 15N measurements in ice cores |
title_full_unstemmed |
An improved method for delta 15N measurements in ice cores |
title_sort |
improved method for delta 15n measurements in ice cores |
publishDate |
2018 |
url |
https://doi.org/10.5194/cpd-4-149-2008 https://cp.copernicus.org/preprints/cpd-2007-0048/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cpd-4-149-2008 10670/1.8dl2wp https://cp.copernicus.org/preprints/cpd-2007-0048/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cpd-4-149-2008 |
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1766165996015452160 |