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

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doi:10.5194/amt-2016-279
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
15 Sep 2016
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.
Intercomparability of XCO2 and XCH4 from the United States TCCON sites
Jacob K. Hedelius1, Harrison Parker2, 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
7Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA
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 (U.S.). 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 U.S. 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. Discuss., doi:10.5194/amt-2016-279, in review, 2016.
Jacob K. Hedelius et al.

Data sets

TCCON data from Lamont, Oklahoma, USA, Release GGG2014R1.
P. O. Wennberg, D. Wunch, C. Roehl, J.-F. Blavier, G. C. Toon, N. Allen, P. Dowell, K. Teske, C. Martin, and J. Martin
doi:10.14291/tccon.ggg2014.lamont01.R1/1255070
TCCON data from Park Falls, Wisconsin, USA, Release GGG2014R0.
P. O. Wennberg, C. Roehl, D. Wunch, G. C. Toon, J.-F. Blavier, R. Washenfelder, G. Keppel-Aleks, N. Allen, and J. Ayers
doi:10.14291/tccon.ggg2014.parkfalls01.R0/1149161
TCCON data from Armstrong Flight Research Center, Edwards, CA, USA, Release GGG2014R1.
L. Iraci, J. Podolske, P. Hillyard, C. Roehl, P. O. Wennberg, J.-F. Blavier, J. Landeros, N. Allen, D. Wunch, J. Zavaleta, E. Quigley, G. Osterman, R. Albertson, K. Dunwoody, and H. Boyden
doi:10.14291/tccon.ggg2014.edwards01.R1/1255068
TCCON data from California Institute of Technology, Pasadena, California, USA, Release GGG2014R1.
P. O. Wennberg, D. Wunch, C. Roehl, J.-F. Blavier, G. C. Toon, and N. Allen
doi:10.14291/tccon.ggg2014.pasadena01.R1/1182415
Jacob K. Hedelius et al.

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Short summary
A pair of portable spectrometers, assumed to be internally precise, were taken to 4 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.
A pair of portable spectrometers, assumed to be internally precise, were taken to 4 different...
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