Computer Science
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011gecoa..75.7099g&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 75, Issue 22, p. 7099-7116.
Computer Science
Scientific paper
The terrestrial carbon cycle and the role of atmospheric CO 2 concentrations in controlling global temperatures can be inferred from the study of ancient soils (paleosols). Soil-formed goethite and calcite have been the primary minerals used as a geochemical proxy for reconstructing atmospheric p CO 2 from ancient terrestrial records. In the case of goethite, optimum sampling strategies for reconstructing p CO 2 focus on the portion of the soil profile that displays steep gradients in both soil CO 2 concentration and δ 13 C values of soil CO 2 such that a keeling plot can be developed for a given soil and atmospheric p CO 2 can be calculated from it. We report data from a Carboniferous paleosol that depart from the expected linear trends. The results indicate that pedogenic goethite is sensitive to variations in the isotopic composition of soil CO 2 , over a range of timescales, and can record these variations in the carbon isotope composition and mole fraction of Fe(CO 3 )OH in solid solution with goethite. We explore possible environmental conditions that can drive these changes as a function of either moisture controlled variations in soil respired CO 2 or in the residence time of carbon in soils. The implications of this result are overestimation of paleoatmospheric p CO 2 from pedogenic goethite.
Gulbranson Erik L.
Montan~ez Isabel P.
Tabor Neil J.
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