noaa-forcing-25030 Paleo-pCO2 Database Western USA Miocene Paleosol CO2 Uncertainty Estimation Breecker, D.O.; Retallack, G.J. Paleo-pCO2 Database Western USA Miocene Paleosol CO2 Uncertainty Estimation 2018-08-28 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25030 Investigator D.O. Breecker Investigator G.J. Retallack earth science paleoclimate climate forcing carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing,null,null,N,median; from paleosols earth science paleoclimate climate forcing carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing,null,null,N,from paleosols earth science paleoclimate climate forcing carbon dioxide,bulk atmosphere,percentile,parts per million,null,climate forcing,null,null,N,2.5 percentile; from paleosols earth science paleoclimate climate forcing age,null,null,million years ago,null,climate forcing,null,null,N,null earth science paleoclimate climate forcing carbon dioxide,bulk atmosphere,percentile,parts per million,null,climate forcing,null,null,N,97.5 percentile; from paleosols earth science paleoclimate climate forcing carbon dioxide geoscientificInformation 23000000 cal yr BP 5500000 cal yr BP Complete 34.9 41.5 -103.1 -100 Continent North America United States Of America Ogallala Formation>LATITUDE >LONGITUDE None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII D.O. Breecker, G.J. Retallack 2014 Palaeogeography, Palaeoclimatology, Palaeoecology 406 1-8 10.1016/j.palaeo.2014.04.012 https://www.sciencedirect.com/science/article/pii/S0031018214001953

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. STUDY NOTES: Carbon isotope (d13C) data and CO2 estimate uncertainty evaluations for Miocene paleosols from the western United States, contributed to the Paleo-pCO2 Database

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/breecker2014paleosol.txt NOAA Template File; Western USA Miocene Paleosol CO2 Uncertainty Estimation GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/breecker2014paleosol.xlsx Excel File; Western USA Miocene Paleosol CO2 Uncertainty Estimation USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11