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

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© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
29 Aug 2016
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Comparisons of the Orbiting Carbon Observatory-2 (OCO-2) XCO2 measurements with TCCON
Debra Wunch1,12, Paul O. Wennberg1, Gregory Osterman2,1, Brendan Fisher2,1, Bret Naylor2,1, Coleen M. Roehl1, Christopher O'Dell3, Lukas Mandrake2,1, Camille Viatte1, David W. Griffith4, Nicholas M. Deutscher4,5, Voltaire A. Velazco4, Justus Notholt5, Thorsten Warneke5, Christof Petri5, Martine De Maziere6, Mahesh K. Sha6, Ralf Sussmann7, Markus Rettinger7, David Pollard8, John Robinson8, Isamu Morino9, Osamu Uchino9, Frank Hase10, Thomas Blumenstock10, Matthaeus Kiel10, Dietrich G. Feist11, Sabrina G. Arnold11, Kimberly Strong12, Joseph Mendonca12, Rigel Kivi13, Pauli Heikkinen13, Laura Iraci14, James Podolske14, Patrick W. Hillyard14,19, Shuji Kawakami15, Manvendra K. Dubey16, Harrison A. Parker16, Eliezer Sepulveda17, Omaira E. G. Rodriguez17, Yao Te18, Pascal Jeseck18, Michael R. Gunson2,1, David Crisp2,1, and Annmarie Eldering2,1 1California Institute of Technology, Pasadena, CA, USA
2Jet Propulsion Laboratory, Pasadena, CA, USA
3Colorado State University, Fort Collins, CO, USA
4University of Wollongong, Wollongong, Australia
5University of Bremen, Bremen, Germany
6Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
7Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK-IFU), Garmisch-Partenkirchen, Germany
8National Institute of Water and Atmospheric Research, Auckland, New Zealand
9National Institute for Environmental Studies (NIES), Tsukuba, Japan
10Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK-ASF), Karlsruhe, Germany
11Max Planck Institute for Biogeochemistry, Jena, Germany
12University of Toronto, Toronto, Canada
13Finnish Meteorological Institute, Sodankylä, Finland
14NASA Ames Research Center, Moffett Field, CA, USA
15Japan Aerospace Exploration Agency (JAXA), Tsukuba, Japan
16Los Alamos National Laboratory, Los Alamos, NM, USA
17AEMet, Izaña, Tenerife, Spain
18LERMA-IPSL, Sorbonne Universités, UPMC Univ Paris 06, CNRS, Observatoire de Paris, PSL Research University, 75005, Paris, France
19Bay Area Environmental Research Institute, Petaluma, CA, USA
Abstract. NASA's Orbiting Carbon Observatory-2 (OCO-2) has been measuring carbon dioxide column-averaged dry air mole fractions, XCO2, in the Earth’s atmosphere for almost two years. In this paper, we describe the comparisons between the OCO-2 version 7Br retrievals and XCO2 estimates from OCO-2's primary ground-based validation network: the Total Carbon Column Observing Network (TCCON). The OCO-2 XCO2 retrievals, after bias correction, agree well globally with the TCCON for nadir, glint, and target observations, with median differences less than 0.5 ppm and RMS differences typically below 1.5 ppm. Target observations over TCCON stations correlate best with the TCCON data (R2 = 0.83) on a global scale. At local scales, the target comparisons reveal residual biases likely related to surface properties and aerosol scattering. It is thus crucial to continue measurement comparisons with TCCON to monitor and evaluate the OCO-2 XCO2 data quality throughout its mission.

Citation: Wunch, D., Wennberg, P. O., Osterman, G., Fisher, B., Naylor, B., Roehl, C. M., O'Dell, C., Mandrake, L., Viatte, C., Griffith, D. W., Deutscher, N. M., Velazco, V. A., Notholt, J., Warneke, T., Petri, C., De Maziere, M., Sha, M. K., Sussmann, R., Rettinger, M., Pollard, D., Robinson, J., Morino, I., Uchino, O., Hase, F., Blumenstock, T., Kiel, M., Feist, D. G., Arnold, S. G., Strong, K., Mendonca, J., Kivi, R., Heikkinen, P., Iraci, L., Podolske, J., Hillyard, P. W., Kawakami, S., Dubey, M. K., Parker, H. A., Sepulveda, E., Rodriguez, O. E. G., Te, Y., Jeseck, P., Gunson, M. R., Crisp, D., and Eldering, A.: Comparisons of the Orbiting Carbon Observatory-2 (OCO-2) XCO2 measurements with TCCON, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-227, in review, 2016.
Debra Wunch et al.
Debra Wunch et al.

Data sets

OCO-2 Level 2 bias-corrected XCO2 and other select fields from the full-physics retrieval aggregated as daily files, Retrospective processing V7r, version 7r
OCO-2 Science Team/Michael Gunson, Annmarie Eldering
TCCON data from Park Falls, Wisconsin, USA, Release GGG2014R0
Wennberg, P. O., Roehl, C., Wunch, D., Toon, G. C., Blavier, J.-F., Washenfelder, R., Keppel-Aleks, G., Allen, N., and Ayers, J.
TCCON data from Lamont, Oklahoma, USA, Release GGG2014R0
Wennberg, P. O., Wunch, D., Roehl, C., Blavier, J.-F., Toon, G. C., Allen, N., Dowell, P., Teske, K., Martin, C., and Martin., J.
TCCON data from California Institute of Technology, Pasadena, California, USA, Release GGG2014R1
Wennberg, P. O., Wunch, D., Roehl, C., Blavier, J.-F. L., Toon, G. C., and Allen, N.
TCCON data from Orleans, France, Release GGG2014R0
Warneke, T., Messerschmidt, J., Notholt, J., Weinzierl, C., Deutscher, N. M., Petri, C., Grupe, P., Vuillemin, C., Truong, F., Schmidt, M., Ramonet, M., and Parmentier, E.
TCCON data from Paris, France, Release GGG2014R0
Te, Y., Jeseck, P., and Janssen, C.
TCCON data from Garmisch, Germany, Release GGG2014R0
Sussmann, R. and Rettinger, M.
TCCON data from Eureka, Canada, Release GGG2014R0
Strong, K., Mendonca, J., Weaver, D., Fogal, P., Drummond, J., Batchelor, R., and Lindenmaier, R.
TCCON data from Lauder, New Zealand, 125HR, Release GGG2014R0
Sherlock, V., Connor, B. J., Robinson, J., Shiona, H., Smale, D., and Pollard, D.
TCCON data from Bremen, Germany, Release GGG2014R0
Notholt, J., Petri, C., Warneke, T., Deutscher, N. M., Buschmann, M., Weinzierl, C., Macatangay, R., and Grupe, P.
TCCON data from Rikubetsu, Hokkaido, Japan, Release GGG2014R1
Morino, I., Yokozeki, N., Matzuzaki, T., and Shishime, A.
TCCON data from Tsukuba, Ibaraki, Japan, 125HR, Release GGG2014R1
Morino, I., Matsuzaki, T., and Shishime, A.
TCCON data from Saga, Japan, Release GGG2014R0
Kawakami, S., Ohyama, H., Arai, K., Okumura, H., Taura, C., Fukamachi, T., and Sakashita, M.
TCCON data from Armstrong Flight Research Center, Edwards, CA, USA, Release GGG2014R0
Iraci, L., Podolske, J., Hillyard, P., Roehl, C., Wennberg, P. O., Blavier, J.-F., Landeros, J., Allen, N., Wunch, D., Zavaleta, J., Quigley, E., Osterman, G., Albertson, R., Dunwoody, K., and Boyden, H.
TCCON data from Karlsruhe, Germany, Release GGG2014R1
Hase, F., Blumenstock, T., Dohe, S., Gross, J., and Kiel, M.
TCCON data from Wollongong, Australia, Release GGG2014R0
Griffith, D. W. T., Velazco, V. A., Deutscher, N. M., Murphy, C., Jones, N., Wilson, S., Macatangay, R., Kettlewell, G., Buchholz, R. R., and Riggenbach, M.
TCCON data from Darwin, Australia, Release GGG2014R0
Griffith, D. W. T., Deutscher, N. M., Velazco, V. A., Wennberg, P. O., Yavin, Y., Aleks, G. K., Washenfelder, R., Toon, G. C., Blavier, J.-F., Murphy, C., Jones, N., Kettlewell, G., Connor, B. J., Macatangay, R., Roehl, C., Ryczek, M., Glowacki, J., Culgan, T., and Bryant, G.
TCCON data from Ascension Island, Saint Helena, Ascension and Tristan da Cunha, Release GGG2014R0
Feist, D. G., Arnold, S. G., John, N., and Geibel, M. C.
TCCON data from Manaus, Brazil, Release GGG2014R0
Dubey, M., Henderson, B., Green, D., Butterfield, Z., Keppel-Aleks, G., Allen, N., Blavier, J.-F., Roehl, C., Wunch, D., and Lindenmaier, R.
TCCON data from Bialystok, Poland, Release GGG2014R1
Deutscher, N. M., Notholt, J., Messerschmidt, J., Weinzierl, C., Warneke, T., Petri, C., Grupe, P., and Katrynski, K.
TCCON data from Reunion Island (La Reunion), France, Release GGG2014R0
De Maziere, M., Sha, M. K., Desmet, F., Hermans, C., Scolas, F., Kumps, N., Metzger, J.-M., Duflot, V., and Cammas, J.-P.
TCCON data from Izana, Tenerife, Spain, Release GGG2014R0
Blumenstock, T., Hase, F., Schneider, M., Garcia, O., and Sepulveda, E.
Debra Wunch et al.


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Short summary
This paper describes the comparisons between NASA's Orbiting Carbon Observatory (OCO-2) column-averaged dry-air mole fractions of CO2 with its primary ground-based validation network, the Total Carbon Column Observing Network (TCCON). The paper shows that while the standard bias correction does a good job of reducing spurious variability globally in the satellite measurements, local biases remain.
This paper describes the comparisons between NASA's Orbiting Carbon Observatory (OCO-2)...