Computer Science
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2277s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 8, pp.2277-2283
Computer Science
1
Scientific paper
Retention of CO 2 on three air-dried and partly water-saturated glacial and eolian sediments was measured at 20°C for a range in, P CO 2 that commonly occurs in unsaturated zones. Ratios of the relative losses of CO 2 and 14 CO 2 from a surrogate atmosphere overlying the sediments were 1:1 for the dry condition. For the wet condition, those relative losses were generally 1:2, indicating bicarbonateion formation and C-isotope exchange. Mass losses of CO 2 per surface area of sediment were similar for dry and wet conditions; however, CO 2 losses for the wet condition were 8 to 17 times greater than losses predicted by calcite equilibria. Occurrence of this comparatively large reservoir of immobile, exchangeable C in unsaturated zones can cause alteration of the C-isotope composition of soil CO 2 and of dissolved inorganic C in interstitial water, and needs to be considered when modeling 14 CO 2 movement in the unsaturated zone or when interpreting radiocarbon ages of infiltrating water.
Armstrong David E.
Striegl Robert G.
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