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| Titel |
Improved CRDS δ13C Stability Through New Calibration Application For CO2 And CH4 |
| VerfasserIn |
Chris Rella, Caleb Arata, Nabil Saad, Graham Leggett, Natasha Miles, Scott Richardson, Ken Davis |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250108288
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| Publikation (Nr.) |
 EGU/EGU2015-8039.pdf |
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| Zusammenfassung |
| Stable carbon isotope ratio measurements of CO2 and CH4 provide valuable insight into
global and regional sources and sinks of the two most important greenhouse gases.
Methodologies based on Cavity Ring-Down Spectroscopy (CRDS) have been developed and
are capable of delivering δ13C measurements with a precision better than 0.12 permil for CO2
and 0.4 permil for CH4 (1 hour window, 5 minute average). Here we present a method to
further improve this measurement stability. We have developed a two-point calibration
method which corrects for δ13C drift due to a dependence on carbon species concentration.
This method calibrates for both carbon species concentration as well as δ13C. In
addition, we further demonstrate that this added stability is especially valuable
when using carbon isotope data in linear regression models such as Keeling plots,
where even small amounts of error can be magnified to give inconclusive results.
Furthermore, we show how this method is used to validate multiple instruments
simultaneously and can be used to create the standard samples needed for field calibrations. |
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