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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 10, 1481-1493, 2017
http://www.atmos-meas-tech.net/10/1481/2017/
doi:10.5194/amt-10-1481-2017
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
20 Apr 2017
Intercomparability of XCO2 and XCH4 from the United States TCCON sites
Jacob K. Hedelius1, Harrison Parker2,3, Debra Wunch3,a, Coleen M. Roehl3, Camille Viatte3, Sally Newman3, Geoffrey C. Toon4,3, James R. Podolske5, Patrick W. Hillyard5,6, Laura T. Iraci5, Manvendra K. Dubey2, and Paul O. Wennberg3,7 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
2Earth and Environmental Science, Los Alamos National Laboratory, Los Alamos, NM, USA
3Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
5NASA Ames Research Center, Mountain View, CA, USA
6Bay Area Environmental Research Institute, Petaluma, CA, USA
7Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
anow at: Department of Physics, University of Toronto, Toronto, Ontario, Canada
Abstract. The Total Carbon Column Observing Network (TCCON) has become the standard for long-term column-averaged measurements of CO2 and CH4. Here, we use a pair of portable spectrometers to test for intra-network bias among the four currently operating TCCON sites in the United States (US). A previous analytical error analysis has suggested that the maximum 2σ site-to-site relative (absolute) bias of TCCON should be less than 0.2 % (0.8 ppm) in XCO2 and 0.4 % (7 ppb) in XCH4. We find here experimentally that the 95 % confidence intervals for maximum pairwise site-to-site bias among the four US TCCON sites are 0.05–0.14 % for XCO2 and 0.08–0.24 % for XCH4. This is close to the limit of the bias we can detect using this methodology.

Citation: Hedelius, J. K., Parker, H., Wunch, D., Roehl, C. M., Viatte, C., Newman, S., Toon, G. C., Podolske, J. R., Hillyard, P. W., Iraci, L. T., Dubey, M. K., and Wennberg, P. O.: Intercomparability of XCO2 and XCH4 from the United States TCCON sites, Atmos. Meas. Tech., 10, 1481-1493, doi:10.5194/amt-10-1481-2017, 2017.
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Short summary
Two portable spectrometers, assumed to be internally precise, were taken to four different sites with (stationary) TCCON spectrometers. Biases of column averaged CO2 and CH4 measured among the TCCON sites were estimated experimentally. Results suggest that maximum (95 % confidence interval) bias among sites is less than what was estimated from a previous analytical error analysis.
Two portable spectrometers, assumed to be internally precise, were taken to four different sites...
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