DOI: 10.1016/j.palaeo.2014.04.012
论文题名: Refining the pedogenic carbonate atmospheric CO2 proxy and application to Miocene CO2
作者: Breecker D.O. ; Retallack G.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 406 起始页码: 1
结束页码: 8
语种: 英语
英文关键词: Carbon isotopes
; Earth system sensitivity
; Miocene
; Paleosol
; Uncertainty
英文摘要: Quantifying uncertainty is essential for any paleoenvironmental proxy. Recent work on propagating error through the equation used to determine atmospheric CO2 concentrations from paleosol carbonates yields conflicting results. Small magnitude uncertainty from Gaussian error propagation contrasts with larger magnitude uncertainty from Monte Carlo error propagation. The discrepancy is reconciled here by revising partial differential equations for the Gaussian approach. Uncertainties calculated using the two approaches are compared and applied to Miocene calcic paleosols. Monte Carlo-propagated errors are asymmetrical but otherwise agree with Gaussian errors. Three methods for assigning soil-respired CO2 concentrations (S(z)) to paleosols are also compared. A revised calibration of depth to the Bk horizon as a direct proxy for S(z) is presented and although it results in lower atmospheric CO2 concentrations than the original calibration, it results in significantly higher calculated atmospheric CO2 than the use of mean annual precipitation as a proxy for S(z) or assigning S(z) values based on soil order. Averaging atmospheric CO2 concentrations calculated using soil-order based S(z) values from >10 penecontemporaenous and independent paleosols will likely result in useful constraints on Earth system sensitivity. The improvement of proxies for S(z) is needed to increase the accuracy and precision and to resolve potential volatility in CO2 time series. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69318
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geological Sciences, The University of Texas at Austin, Austin, TX, United States; Department of Geological Sciences, The University of Oregon, Eugene, OR, United States
Recommended Citation:
Breecker D.O.,Retallack G.J.. Refining the pedogenic carbonate atmospheric CO2 proxy and application to Miocene CO2[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,406