Carbon dioxide retention and carbon exchange on unsaturated Quaternary sediments
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Abstract
Retention of CO2 on three air-dried and partly water-saturated glacial and eolian sediments was measured at 20°C for a range in, PCO2 that commonly occurs in unsaturated zones. Ratios of the relative losses of CO2 and 14CO2 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 CO2 per surface area of sediment were similar for dry and wet conditions; however, CO2 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 CO2 and of dissolved inorganic C in interstitial water, and needs to be considered when modeling 14CO2 movement in the unsaturated zone or when interpreting radiocarbon ages of infiltrating water.
Suggested Citation
Striegl, R.G., Armstrong, D., 1990, Carbon dioxide retention and carbon exchange on unsaturated Quaternary sediments: Geochimica et Cosmochimica Acta, v. 54, no. 8, p. 2277-2283, https://doi.org/10.1016/0016-7037(90)90051-L.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Carbon dioxide retention and carbon exchange on unsaturated Quaternary sediments |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/0016-7037(90)90051-L |
| Volume | 54 |
| Issue | 8 |
| Year Published | 1990 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Coop Res Unit Seattle |
| Description | 7 p. |
| First page | 2277 |
| Last page | 2283 |