文章基本信息

标题：A high-precision method for measurement of paleoatmospheric CO2 in small polar ice samples
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作者：Jinho Ahn ; Edward J. Brook ; Kate Howell 等
期刊名称：Journal of Glaciology
印刷版ISSN：0022-1430
电子版ISSN：1727-5652
出版年度：2009
卷号：55
期号：191
页码：499-506
DOI：10.3189/002214309788816731
出版社：Cambridge University Press
摘要：We describe a high-precision method, now in use in our laboratory, for measuring the CO 2 mixing ratio of ancient air trapped in polar ice cores. Occluded air in ice samples weighing ∼8–15 g is liberated by crushing with steel pins at −35°C and trapped at −263°C in a cryogenic cold trap. CO 2 in the extracted air is analyzed using gas chromatography. Replicate measurements for several samples of high-quality ice from the Siple Dome and Taylor Dome Antarctic ice cores have pooled standard deviations of <0.9 ppm. This high-precision technique is directly applicable to high-temporal-resolution studies for detection of small CO 2 variations, for example CO 2 variations of a few parts per million on millennial to decadal scales.