Estimates of
pCO2 in deep time provide fundamental constraints on ancient
atmospheric conditions, yet can include considerable uncertainty because of
variability related to distinct carbon sources. To better constrain the
role of different OM sources on pCO2 estimates derived from
pedogenic carbonate, Myers et al. use a range of sources of organic
matter to estimate the concentration of carbon dioxide in the atmosphere in
both modern and Jurassic soils. The results indicate that the pedogenic
carbonate CO2 paleobarometer is sensitive to variation in stable
carbon isotope composition of soil-respired CO2. Additionally,
organic matter occluded in pedogenic calcite produces reasonable pCO2
estimates.
Effects of different organic-matter sources on estimates of atmospheric and soil pCO2 using pedogenic carbonate by Timothy S. Myers, Neil J. Tabor, Louis L. Jacobs, and Robert
Bussert
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