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On the Application and Interpretation of Keeling Plots in Paleo Climate Research – Deciphering Δ13C of Atmospheric Co2 Measured in Ice Cores : Volume 3, Issue 3 (14/06/2006)

By Köhler, P.

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Book Id: WPLBN0003975040
Format Type: PDF Article :
File Size: Pages 61
Reproduction Date: 2015

Title: On the Application and Interpretation of Keeling Plots in Paleo Climate Research – Deciphering Δ13C of Atmospheric Co2 Measured in Ice Cores : Volume 3, Issue 3 (14/06/2006)  
Author: Köhler, P.
Volume: Vol. 3, Issue 3
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Schmitt, J., Fischer, H., & Köhler, P. (2006). On the Application and Interpretation of Keeling Plots in Paleo Climate Research – Deciphering Δ13C of Atmospheric Co2 Measured in Ice Cores : Volume 3, Issue 3 (14/06/2006). Retrieved from http://www.ebooklibrary.org/


Description
Description: Alfred Wegener Institute for Polar and Marine Research, P.O. Box 12 01 61, 27515 Bremerhaven, Germany. The Keeling plot analysis is an interpretation method widely used in terrestrial carbon cycle research to quantify exchange processes of carbon between terrestrial reservoirs and the atmosphere. Here, we analyse measured data sets and artificial time series of the partial pressure of atmospheric carbon dioxide (pCO2) and of Δ13C of CO2 over industrial and glacial/interglacial time scales and investigate to what extent the Keeling plot methodology can be applied to longer time scales. The artificial time series are simulation results of the global carbon cycle box model BICYCLE. Our analysis shows that features seen in pCO2 and Δ13C during the industrial period can be interpreted with respect to the Keeling plot. However, only a maximum of approximately half of the signal can be explained by this method. The signals recorded in ice cores caused by abrupt terrestrial carbon uptake or release loose information due to air mixing in the firn before bubble enclosure and limited sampling frequency. For less abrupt changes as occurring during glacial cycles carbon uptake by the ocean cannot longer be neglected. We introduce an equation for the calculation of the effective isotopic signature of long-term changes in the carbon cycle, in which the ocean is introduced as third reservoir. This is a paleo extention of the two reservoir mass balance equations of the Keeling plot approach. Steady state analyses of changes in the terrestrial and marine biosphere lead to similar effective isotopic signatures (−8.6 per mil) of the carbon fluxes perturbing the atmosphere. These signatures are more positive than the Δ13C signals of the sources, e.g. the terrestrial carbon pools themselves (~−25 per mil). In all other cases the effective isotopic signatures are larger (−8.2 per mil to −0.7 per mil), and very often indistinguishable in the light of the uncertainties. Therefore, a back calculation from well distinct fluctuations in pCO2 and Δ13C to identify their origin using the Keeling plot approach seems not possible.

Summary
On the application and interpretation of Keeling plots in paleo climate research – deciphering Δ13C of atmospheric CO2 measured in ice cores

 

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