Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..73..207y&link_type=abstract
Earth and Planetary Science Letters, Volume 73, Issue 2-4, p. 207-210.
Physics
6
Scientific paper
Gas samples from the ice core of Camp Century, Greenland, were analysed by mass spectrometry. It was found that the 18O content of oxygen gas in bubbles at 555 m, 1002 m and 1248 m depth were higher than that of the present air by 0.61, 0.28 and 1.00‰, respectively. The nitrogen-argon ratio of gas in 1248 m core samples was higher than that of the present air. The solution of gas in melt water in bubbles and subsequent pressing out of solution might increase the nitrogen-argon ratio in gas. It was calculated that the original oxygen gas in bubbles of ice core decreased by 1.27%. The oxygen-argon ratio in the same gas was smaller than that of the present air, and the isotopic separation factor of the decrease of oxygen was 1.093, which is too high as a separation factor for solution by melting of ice and for oxygen consumption. These phenomena cannot be explained by processes involving melting of ice and mixing of supercooled droplets with snow. The change of isotopic content of oxygen in bubble air may be due to the change of isotopic content of seawater during glacial periods.
Koji Shigehara
Langway Chester C.
Yoshio Horibe
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