Firn Air Inert Gas and Oxygen Observations from Siple Dome, 1996, and the South Pole, 2001

Data Contributors SEVERINGHAUS, JEFFREY P. BATTLE, M. BENDER, MICHAEL Parameters FIRN ICE CORE AIR BUBBLES ICE SHEETS ISOTOPES SNOW/ICE CHEMISTRY Instruments CORING DEVICES FLASKS MASS SPECTROMETERS

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This data set includes gas ratios in polar firn air: O₂/N₂, ¹⁵N/¹⁴N, ⁴⁰Ar/N₂, ⁴⁰Ar/³⁶Ar, ⁴⁰Ar/³⁸Ar, ⁸⁴Kr/³⁶Ar, ¹³²Xe/³⁶Ar, and ²²Ne/³⁶Ar. Investigators sampled air from the permeable snowpack (firn) layer at two sites: Siple Dome, Antarctica in 1996 and at the South Pole in 2001. They observed and modeled the processes of gravitational settling, thermal fractionation, and preferential exclusion of small gas molecules from closed air bubbles. The purpose of this study was to understand these physical processes, which affect the composition of bubbles trapped in ice. By measuring these gas ratios in the ancient air preserved in bubbles trapped in ice, researchers can determine past atmospheric composition and local temperature changes along with the relative timing and magnitude of such events.

The data file is available in Microsoft Excel format. The research paper is available in PDF. Data and the research paper are available via FTP.

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See Also

• Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole
• Siple Dome Core Data from Measurements of the d18O of Paleoatmospheric O2
• Siple Dome Ice Core Chemistry and Ion Data
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