(NAS Colloquium) Carbon Dioxide and Climate Change (1997) / Chapter Skim
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Pages 71-77
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From page 71... ...
Keeling, held November 13-15, 1995, at the National Academy of Sciences, Irvine, CA. Gases in ice cores MICHAEL BENDER*
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First, seasonal layering may be absent and air may be trapped throughout the bubble closeoff zone. In this case, the composition of the bulk trapped gases in ice cores will be further convoluted because of the finite closeoff interval.
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The final process influencing the composition of gas in polar firn and ice cores is effusion. Craig et al.
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8346 CO11OqUiUm PaPer: Bender et al.
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Studies of trapped gases in ice cores have revealed preanthropogenic levels of two other properties. The preanthropogenic N2O concentration is estimated to have been about 275-285 ppbv, compared with a contemporary value of about 311 ppbv (24, 31, 32~.
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Sci. USA 94 (1997J organic carbon in biogenic debris falling out of the surface ocean, and changes in the calcium carbonate compensation depth in the deep ocean have been invoked to change the alkalinity of surface waters.
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(1985) in The Carbon Cycle and Atmospheric CO2: Natural Variations Archean to Present, Geophysical Monograph Series, eds.
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