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Measurements of stable isotopes and ...

Rice, Andrew LaMarche.

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Measurements of stable isotopes and isotope effects in atmospheric methane.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Measurements of stable isotopes and isotope effects in atmospheric methane./
作者:	Rice, Andrew LaMarche.
面頁冊數:	298 p.
附註:	Chair: Ralph J. Cicerone.
Contained By:	Dissertation Abstracts International63-01B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3039223
ISBN:	049352469X

Measurements of stable isotopes and isotope effects in atmospheric methane.
Rice, Andrew LaMarche.

Measurements of stable isotopes and isotope effects in atmospheric methane. - 298 p.

Chair: Ralph J. Cicerone.

Thesis (Ph.D.)--University of California, Irvine, 2002.

Measurements of stable carbon and hydrogen isotope ratios in atmospheric methane provide valuable information for constraining budget estimates and understanding temporal and spatial variability in methane abundance. The development of a new analytical technique, continuous flow gas chromatography isotope ratio mass spectrometry, for the measurement of <super>13</super>C/<super> 12</super>C and D/H ratios in atmospheric methane is described. This technique provides for measurement on a 60 ml aliquot of ambient air compared with the more conventional technique of offline preparation followed by dual inlet isotope ratio mass spectrometry which requires at least three orders of magnitude more air. Additionally, isotope analysis can be performed much more rapidly while retaining a comparable level of precision. Using this and other analytical techniques, measurements of methane mixing and isotope ratios are reported from air collected at several remote clean air sites: Montaña de Oro, California, Niwot Ridge, Colorado, and from recent Pacific Ocean transects. D/H ratios in background atmospheric methane are the first to be reported from this laboratory. Observed seasonal behavior in the D/H ratios is roughly anti-correlated with observed methane mixing ratios and is in large part sink-driven. These observations contrast with that of <super>13</super>C/<super>12</super>C ratios which appear more source-driven in their seasonal behavior. Measurements of <super>13</super>C/<super>12</super>C and D/H ratios are also reported from whole air samples collected from the upper troposphere and lower stratosphere aboard the NASA ER2 and comprise the most extensive high precision data set to date. These measurements show significant enrichment in the heavy isotopomers with decreasing methane mixing ratio as a result of kinetic isotope effects in methane chemical loss processes.

ISBN: 049352469XSubjects--Topical Terms:

545717
Biogeochemistry.

Measurements of stable isotopes and isotope effects in atmospheric methane.
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