Determination of the isotopic composition of atmospheric methane and its application in the Antarctic
A procedure for establishing the C-13/C-12 ratio and the C-14 abundance in the atmospheric methane is discussed. The method involves air sample collection, measurement of the methane mixing ratio by gas chromotography followed by quantitative conversion of the methane in the air samples to CO2 and H...
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1991
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ftnasantrs:oai:casi.ntrs.nasa.gov:19910066691 2023-05-15T13:53:23+02:00 Determination of the isotopic composition of atmospheric methane and its application in the Antarctic Lowe, David C. Brenninkmeijer, Carl A. M. Tyler, Stanley C. Dlugkencky, Edward J. Unclassified, Unlimited, Publicly available Aug 20, 1991 http://ntrs.nasa.gov/search.jsp?R=19910066691 unknown http://ntrs.nasa.gov/search.jsp?R=19910066691 Accession ID: 91A51314 Copyright Other Sources 46 Journal of Geophysical Research; 96; 15 1991 ftnasantrs 2012-02-15T19:06:27Z A procedure for establishing the C-13/C-12 ratio and the C-14 abundance in the atmospheric methane is discussed. The method involves air sample collection, measurement of the methane mixing ratio by gas chromotography followed by quantitative conversion of the methane in the air samples to CO2 and H2O, and analysis of the resulting CO2 for the C-13/C-12 ratio by stable isotope ratio mass spectrometry and measurement of C-14 content by accelerator mass spectrometry. The carbon isotropic composition of methane in air collected at Baring Head, New Zealand, and in air collected on aircraft flights between New Zealand and Antarctica is determined by the method, and no gradient in the composition between Baring Head and the South Pole station is found. As the technique is refined, and more data is gathered, small seasonal and long-term variations in C-13 are expected to be resolved. Other/Unknown Material Antarc* Antarctic Antarctica South pole South pole NASA Technical Reports Server (NTRS) Antarctic New Zealand South Pole The Antarctic |
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NASA Technical Reports Server (NTRS) |
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46 Lowe, David C. Brenninkmeijer, Carl A. M. Tyler, Stanley C. Dlugkencky, Edward J. Determination of the isotopic composition of atmospheric methane and its application in the Antarctic |
topic_facet |
46 |
description |
A procedure for establishing the C-13/C-12 ratio and the C-14 abundance in the atmospheric methane is discussed. The method involves air sample collection, measurement of the methane mixing ratio by gas chromotography followed by quantitative conversion of the methane in the air samples to CO2 and H2O, and analysis of the resulting CO2 for the C-13/C-12 ratio by stable isotope ratio mass spectrometry and measurement of C-14 content by accelerator mass spectrometry. The carbon isotropic composition of methane in air collected at Baring Head, New Zealand, and in air collected on aircraft flights between New Zealand and Antarctica is determined by the method, and no gradient in the composition between Baring Head and the South Pole station is found. As the technique is refined, and more data is gathered, small seasonal and long-term variations in C-13 are expected to be resolved. |
format |
Other/Unknown Material |
author |
Lowe, David C. Brenninkmeijer, Carl A. M. Tyler, Stanley C. Dlugkencky, Edward J. |
author_facet |
Lowe, David C. Brenninkmeijer, Carl A. M. Tyler, Stanley C. Dlugkencky, Edward J. |
author_sort |
Lowe, David C. |
title |
Determination of the isotopic composition of atmospheric methane and its application in the Antarctic |
title_short |
Determination of the isotopic composition of atmospheric methane and its application in the Antarctic |
title_full |
Determination of the isotopic composition of atmospheric methane and its application in the Antarctic |
title_fullStr |
Determination of the isotopic composition of atmospheric methane and its application in the Antarctic |
title_full_unstemmed |
Determination of the isotopic composition of atmospheric methane and its application in the Antarctic |
title_sort |
determination of the isotopic composition of atmospheric methane and its application in the antarctic |
publishDate |
1991 |
url |
http://ntrs.nasa.gov/search.jsp?R=19910066691 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic New Zealand South Pole The Antarctic |
geographic_facet |
Antarctic New Zealand South Pole The Antarctic |
genre |
Antarc* Antarctic Antarctica South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica South pole South pole |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19910066691 Accession ID: 91A51314 |
op_rights |
Copyright |
_version_ |
1766258436220125184 |