A multi-year record of airborne CO<sub>2</sub> observations in the US Southern Great Plains
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Abstract. We report on 10 yr of airborne measurements of atmospheric CO2 mole fraction from continuous and flask systems, collected between 2002 and 2012 over the Atmospheric Radiation Measurement Program Climate Research Facility in the US Southern Great Plains (SGP). These observations were designed to quantify trends and variability in atmospheric mole fraction of CO2 and other greenhouse gases with the precision and accuracy needed to evaluate ground-based and satellite-based column CO2 estimates, test forward and inverse models, and help with the interpretation of ground-based CO2 mole-fraction measurements. During flights, we measured CO2 and meteorological data continuously and collected flasks for a rich suite of additional gases: CO2, CO, CH4, N2O, 13CO2, carbonyl sulfide (COS), and trace hydrocarbon species. These measurements were collected approximately twice per week by small aircraft (Cessna 172 initially, then Cessna 206) on a series of horizontal legs ranging in altitude from 460 m to 5500 m a.m.s.l. Since the beginning of the program, more than 400 continuous CO2 vertical profiles have been collected (2007–2012), along with about 330 profiles from NOAA/ESRL 12-flask (2006–2012) and 284 from NOAA/ESRL 2-flask (2002–2006) packages for carbon cycle gases and isotopes. Averaged over the entire record, there were no systematic differences between the continuous and flask CO2 observations when they were sampling the same air, i.e., over the one-minute flask-sampling time. Using multiple technologies (a flask sampler and two continuous analyzers), we documented a mean difference of < 0.2 ppm between instruments. However, flask data were not equivalent in all regards; horizontal variability in CO2 mole fraction within the 5–10 min legs sometimes resulted in significant differences between flask and continuous measurement values for those legs, and the information contained in fine-scale variability about atmospheric transport was not captured by flask-based observations. The CO2 mole fraction trend at 3000 m a.m.s.l. was 1.91 ppm yr−1 between 2008 and 2010, very close to the concurrent trend at Mauna Loa of 1.95 ppm yr−1. The seasonal amplitude of CO2 mole fraction in the free troposphere (FT) was half that in the planetary boundary layer (PBL) (~ 15 ppm vs. ~ 30 ppm) and twice that at Mauna Loa (approximately 8 ppm). The CO2 horizontal variability was up to 10 ppm in the PBL and less than 1 ppm at the top of the vertical profiles in the FT.
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Abshire, J. B., Riris, H., Allan, G. R., Weaver, C. J., Mao, J. P., Sun, X., Hasselbrack, W. L., Kawa, S. R., and Biraud, S.: Pulsed airborne lidar measurements of atmospheric CO2 column absorption, Tellus B, 62, 770–783, 2010.
Ackerman, T. P., Genio, A. D. D., Ellingson, R. G., Ferrare, R. A., Klein, S. A., McFarquhar, G. M., Lamb, P. J., Long, C. N., and Verlinde, J.: Atmospheric radiation measurement program science plan: current status and future direcitons of the ARM science program, US Department of Energy, Office of Biological and Environmental Research, Washington, DC, 2004.
Bakwin, P. S., Tans, P. P., Hurst, D. F., and Zhao, C. L.: Measurements of carbon dioxide on very tall towers: results of the NOAA/CMDL program, Tellus B, 50, 401–415, 1998.
Billesbach, D. P., Fischer, M. L., Torn, M. S., and Berry, J. A.: A portable eddy covariance system for the measurement of ecosystem-atmosphere exchange of CO2, water vapor, and energy, J. Atmos. Ocean. Tech., 21, 639–650, 2004.
Carouge, C., Rayner, P. J., Peylin, P., Bousquet, P., Chevallier, F., and Ciais, P.: What can we learn from European continuous atmospheric CO2 measurements to quantify regional fluxes – Part 2: Sensitivity of flux accuracy to inverse setup, Atmos. Chem. Phys., 10, 3119–3129, https://doi.org/10.5194/acp-10-3119-2010, 2010.
Chen, H., Winderlich, J., Gerbig, C., Hoefer, A., Rella, C. W., Crosson, E. R., Van Pelt, A. D., Steinbach, J., Kolle, O., Beck, V., Daube, B. C., Gottlieb, E. W., Chow, V. Y., Santoni, G. W., and Wofsy, S. C.: High-accuracy continuous airborne measurements of greenhouse gases (CO2 and CH4) using the cavity ring-down spectroscopy (CRDS) technique, Atmos. Meas. Tech., 3, 375–386, https://doi.org/10.5194/amt-3-375-2010, 2010.
Choi, Y. H., Vay, S. A., Vadrevu, K. P., Soja, A. J., Woo, J. H., Nolf, S. R., Sachse, G. W., Diskin, G. S., Blake, D. R., Blake, N. J., Singh, H. B., Avery, M. A., Fried, A., Pfister, L., and Fuelberg, H. E.: Characteristics of the atmospheric CO2 signal as observed over the conterminous United States during INTEX-N A., J. Geophys. Res.-Atmos., 113, D07301, https://doi.org/10.1029/2007jd008899, 2008.
Ciais, P., Rayner, P., Chevallier, F., Bousquet, P., Logan, M., Peylin, P., and Ramonet, M.: Atmospheric inversions for estimating CO2 fluxes: methods and perspectives, Climatic Change, 103, 69–92, 2010.
Conway, T. J., Tans, P. P., Waterman, L. S., and Thoning, K. W.: Evidence for interannual variability of the carbon-cycle from the national-oceanic-and-atmospheric-administration climate-monitoring-and-diagnostics-laboratory global-air-sampling-network, J. Geophys. Res.-Atmos., 99, 22831–22855, 1994.
Denning, A. S., Fung, I. Y., and Randall, D.: Latitudinal gradient of atmospheric CO2 due to seasonal exchange with land biota, Nature, 376, 240–243, 1995.
Enting, I. G. and Mansbridge, J. V.: Latitudinal distribution of sources and sinks of CO2 – results of an inversion study, Tellus B, 43, 156–170, 1991.
Enting, I. G., Trudinger, C. M., and Francey, R. J.: A synthesis inversion of the concentration and Delta-C-13 of atmospheric CO2, Tellus B, 47, 35–52, 1995.
Fischer, M. L., Torn, M. S., Billesbach, D. P., Doyle, G., Northup, B., and Biraud, S. C.: Carbon, Water, and Heat Flux Responses to Experimental Burning and Drought in a Tallgrass Prairie, Agr. Forest Meteorol., 166–167, 169–174, 2012.
Font, A., Morgui, J. A., and Rodo, X.: Atmospheric CO2 in situ measurements: Two examples of Crown Design flights in NE Spain, J. Geophys. Res.-Atmos., 113, D12308, https://doi.org/10.1029/2007JD009111, 2008.
Friedlingstein, P., Cox, P., Betts, R., Bopp, L., Von Bloh, W. W., Brovkin, V., Cadule, P., Doney, S., Eby, M., Fung, I., Bala, G., John, J., Jones, C., Joos, F., Kato, T., Kawamiya, M., Knorr, W., Lindsay, K., Matthews, H. D., Raddatz, T., Rayner, P., Reick, C., Roeckner, E., Schnitzler, K. G., Schnur, R., Strassmann, K., Weaver, A. J., Yoshikawa, C., and Zeng, N.: Climatecarbon cycle feedback analysis: results from the C4MIP model intercomparison, J. Climate, 19, 3337–3353, 2006.
Gerbig, C., Lin, J. C., Wofsy, S. C., Daube, B. C., Andrews, A. E., Stephens, B. B., Bakwin, P. S., and Grainger, C. A.: Toward constraining regional-scale fluxes of CO2 with atmospheric observations over a continent: 1. Observed spatial variability from airborne platforms, J. Geophys. Res.-Atmos., 108, 4756, https://doi.org/10.1029/2002jd003018, 2003.
Gurney, K. R., Law, R. M., Denning, A. S., Rayner, P. J., Baker, D., Bousquet, P., Bruhwiler, L., Chen, Y. H., Ciais, P., Fan, S., Fung, I. Y., Gloor, M., Heimann, M., Higuchi, K., John, J., Maki, T., Maksyutov, S., Masarie, K., Peylin, P., Prather, M., Pak, B. C., Randerson, J., Sarmiento, J., Taguchi, S., Takahashi, T., and Yuen, C. W.: Towards robust regional estimates of CO2 sources and sinks using atmospheric transport models, Nature, 415, 626–630, 2002.
Gurney, K. R., Law, R. M., Denning, A. S., Rayner, P. J., Pak, B. C., Baker, D., Bousquet, P., Bruhwiler, L., Chen, Y. H., Ciais, P., Fung, I. Y., Heimann, M., John, J., Maki, T., Maksyutov, S., Peylin, P., Prather, M., and Taguchi, S.: Transcom 3 inversion intercomparison: model mean results for the estimation of seasonal carbon sources and sinks, Global Biogeochem. Cy., 18, GB1010, https://doi.org/10.1029/2003GB002111, 2004.
Haszpra, L., Ramonet, M., Schmidt, M., Barcza, Z., Pátkai, Zs., Tarczay, K., Yver, C., Tarniewicz, J., and Ciais, P.: Variation of CO2 mole fraction in the lower free troposphere, in the boundary layer and at the surface, Atmos. Chem. Phys., 12, 8865–8875, https://doi.org/10.5194/acp-12-8865-2012, 2012.
Helliker, B. R., Berry, J. A., Betts, A. K., Bakwin, P. S., Davis, K. J., Denning, A. S., Ehleringer, J. R., Miller, J. B., Butler, M. P., and Ricciuto, D. M.: Estimates of net CO2 flux by application of equilibrium boundary layer concepts to CO2 and water vapor measurements from a tall tower, J. Geophys. Res.-Atmos., 109, D20106, https://doi.org/10.1029/2004jd004532, 2004.
Hill, T. C., Williams, M., Woodward, F. I., and Moncrieff, J. B.: Constraining ecosystem processes from tower fluxes and atmospheric profiles, Ecol. Appl., 21, 1474–1489, 2011.
Huntzinger, D. N., Gourdji, S. M., Mueller, K. L., and Michalak, A. M.: A systematic approach for comparing modeled biospheric carbon fluxes across regional scales, Biogeosciences, 8, 1579–1593, https://doi.org/10.5194/bg-8-1579-2011, 2011.
IPCC: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the IPCC, Cambridge University Press, Cambridge, UK and New York, 2007.
Karion, A., Sweeney, C., Wolter, S., Newberger, T., Chen, H., Andrews, A., Kofler, J., Neff, D., and Tans, P.: Long-term greenhouse gas measurements from aircraft, Atmos. Meas. Tech., 6, 511–526, https://doi.org/10.5194/amt-6-511-2013, 2013.
Keeling, C. D.: The concentration and isotopic abundances of carbon dioxide in the atmosphere, Tellus, 12, 200–203, 1960.
Kuai, L., Worden, J., Kulawik, S., Bowman, K., Lee, M., Biraud, S. C., Abshire, J. B., Wofsy, S. C., Natraj, V., Frankenberg, C., Wunch, D., Connor, B., Miller, C., Roehl, C., Shia, R.-L., and Yung, Y.: Profiling tropospheric CO2 using Aura TES and TCCON instruments, Atmos. Meas. Tech., 6, 63–79, https://doi.org/10.5194/amt-6-63-2013, 2013.
Kulawik, S. S., Jones, D. B. A., Nassar, R., Irion, F. W., Worden, J. R., Bowman, K. W., Machida, T., Matsueda, H., Sawa, Y., Biraud, S. C., Fischer, M. L., and Jacobson, A. R.: Characterization of Tropospheric Emission Spectrometer (TES) CO2 for carbon cycle science, Atmos. Chem. Phys., 10, 5601-5623, https://doi.org/10.5194/acp-10-5601-2010, 2010.
Kulawik, S. S., Worden, J. R., Wofsy, S. C., Biraud, S. C., Nassar, R., Jones, D. B. A., Olsen, E. T., and Osterman, and the TES and HIPPO teams, G. B.: Comparison of improved Aura Tropospheric Emission Spectrometer (TES) CO2 with HIPPO and SGP aircraft profile measurements, Atmos. Chem. Phys. Discuss., 12, 6283–6329, https://doi.org/10.5194/acpd-12-6283-2012, 2012.
Langenfelds, R. L., Francey, R. J., Steele, L. P., Dunse, B. L., Butler, T. M., Spencer, D. A., Kivlighon, L. M., and Meyer, C. P.: Flask sampling from Cape Grim overflights. Baseline Atmospheric Program (Australia) 1999–2000, edited by: Tindale, N. W., Derek, N., and Fraser, P. J., Bureau of Meteorology and CSIRO Atmospheric Research, Melbourne, Australia, 73–75, 2003.
Lin, J. C., Gerbig, C., Wofsy, S. C., Andrews, A. E., Daube, B. C., Grainger, C. A., Stephens, B. B., Bakwin, P. S., and Hollinger, D. Y.: Measuring fluxes of trace gases at regional scales by Lagrangian observations: application to the CO2 budget and rectification airborne (COBRA) study, J. Geophys. Res.-Atmos., 109, D15304, https://doi.org/10.1029/2004JD004754, 2004.
Masarie, K. A., Langenfelds, R. L., Allison, C. E., Conway, T. J., Dlugokencky, E. J., Francey, R. J., Novelli, P. C., Steele, L. P., Tans, P. P., Vaughn, B., and White, J. W. C.: NOAA/CSIRO flask air intercomparison experiment: a strategy for directly assessing consistency among atmospheric measurements made by independent laboratories, J. Geophys. Res.-Atmos., 106, 20445–20464, 2001.
Mays, K. L., Shepson, P. B., Stirm, B. H., Karion, A., Sweeney, C., and Gurney, K. R.: Aircraft based measurements of the carbon footprint of Indianapolis, Environ. Sci. Technol., 43, 7816–7823, 2009.
NACP SIS: available at: http://www.nacarbon.org/nacp/documents/NACP-SIS-final-july05.pdf (last access: 24 September 2012), 2005.
Pales, J. C. and Keeling, C. D.: Concentration of atmospheric carbon dioxide in Hawaii, J. Geophys. Res., 70, 6053–6076, 1965.
Pataki, D. E., Xu, T., Luo, Y. Q., and Ehleringer, J. R.: Inferring biogenic and anthropogenic carbon dioxide sources across an urban to rural gradient, Oecologia, 152, 307–322, 2007.
Pearman, G. I., Hyson, P., and Fraser, P. J.: The global distribution of atmospheric carbondioxide. 1: Aspects of observations and modeling, J. Geophys. Res.-Ocean Atmos., 88, 3581–3590, 1983.
Peters, W., Jacobson, A. R., Sweeney, C., Andrews, A. E., Conway, T. J., Hughes, J., Schaefer, K., Masarie, K. A., Jacobson, A. R., Miller, J. B., Cho, C. H., Ramonet, M., Schmidt, M., Ciattaglia, L., Apadula, F., Helta, D., Meinhardt, F., di Sarra, A. G., Piacentino, S., Sferlazzo, D., Aalto, T., Hatakka, J., Strom, J., Haszpra, L., Meijer, H. A. J., van der Laan, S., Neubert, R. E. M., Jordan, A., Rodo, X., Morgui, J. A., Vermeulen, A. T., Popa, E., Rozanski, K., Zimnoch, M., Manning, A. C., Leuenberger, M., Uglietti, C., Dolman, A. J., Ciais, P., Heimann, M., and Tans, P. P.: An atmospheric perspective on North American carbon dioxide exchange: carbontracker, P. Natl. Acad. Sci. USA, 104, 18925–18930, 2007.
Peters, W., Krol, M. C., van der Werf, G. R., Houweling, S., Jones, C. D., Bousquet, P., Peylin, P., Maksyutov, S., Marshall, J., Rodenbeck, C., Langenfelds, R. L., Steele, L. P., Francey, R. J., Tans, P., and Sweeney, C.: Seven years of recent European net terrestrial carbon dioxide exchange constrained by atmospheric observations, Global. Change. Biol., 16, 1317–1337, 2010.
Pickett-Heaps, C. A., Rayner, P. J., Law, R. M., Ciais, P., Patra, P. K., Bousquet, P., Peylin, P., Maksyutov, S., Marshall, J., Rödenbeck, C., Langenfelds, R. L., Steele, L. P., Francey, R. J., Tans, P., and Sweeney, C.: Atmospheric CO2 inversion validation using vertical profile measurements: analysis of four independent inversion models, J. Geophys. Res.-Atmos, 116, D12305, https://doi.org/10.1029/2010jd014887, 2011.
Rayner, P. J., Enting, I. G., Francey, R. J., and Langenfelds, R.: Reconstructing the recent carbon cycle from atmospheric CO2, delta C-13 and O2/N2 observations, Tellus B, 51, 213–232, 1999.
Rayner, P. J., Law, R. M., O'Brien, D. M., Butler, T. M., and Dilley, A. C.: Global observations of the carbon budget – 3. Initial assessment of the impact of satellite orbit, scan geometry, and cloud on measuring CO2 from space, J. Geophys. Res.-Atmos, 107, 4557, https://doi.org/10.1029/2001JD000618, 2002.
Riley, W. J., Biraud, S. C., Torn, M. S., Fischer, M. L., Billesbach, D. P., and Berry, J. A.: Regional CO2 and latent heat surface fluxes in the Southern Great Plains: measurements, modeling, and scaling, J. Geophys. Res.-Biogeo., 114, G04009, https://doi.org/10.1029/2009JG001003, 2009.
Shepson, P. B., Cambaliza, M., Davis, K., Gurney, K., Lauvaux, T., Richardson, N., Richardson, S., Sweeney, C., and Turnbull, J.: Indianapolis flux experiment (INFLUX): experiment design and new results regarding measurements of urban-area CO2 and CH4 emission fluxes, Abstr. Pap. Am. Chem. S., Vol. 242, 2011.
Stephens, B. B., Gurney, K. R., Tans, P. P., Sweeney, C., Peters, W., Bruhwiler, L., Ciais, P., Ramonet, M., Bousquet, P., Nakazawa, T., Aoki, S., Machida, T., Inoue, G., Vinnichenko, N., Lloyd, J., Jordan, A., Heimann, M., Shibistova, O., Langenfelds, R. L., Steele, L. P., Francey, R. J., and Denning, A. S.: Weak northern and strong tropical land carbon uptake from vertical profiles of atmospheric CO2, Science, 316, 1732–1735, 2007.
Stephens, B. B., Miles, N. L., Richardson, S. J., Watt, A. S., and Davis, K. J.: Atmospheric CO2 monitoring with single-cell NDIR-based analyzers, Atmos. Meas. Tech., 4, 2737–2748, https://doi.org/10.5194/amt-4-2737-2011, 2011.
Stull, R. B.: An Introduction to Boundary Layer Meteorology, Kluwer Academic, Boston, Mass, 666 pp., 1988.
Tans, P. P., Thoning, K. W., Elliott, W. P., and Conway, T. J.: Error-estimates of background atmospheric CO2 patterns from weekly flask samples, J. Geophys. Res.-Atmos, 95, 14063–14070, 1990.
Williams, I. N., Riley, W. J., Torn, M. S., Berry, J. A., and Biraud, S. C.: Using boundary layer equilibrium to reduce uncertainties in transport models and CO2 flux inversions, Atmos. Chem. Phys., 11, 9631–9641, https://doi.org/10.5194/acp-11-9631-2011, 2011.
WMO: Report of the 15th WMO/IAEA meeting of experts on carbon dioxide, other greenhouse gases, and related tracers measurement techniques, Jena, Germany, 2011.
Wunch, D., Toon, G. C., Wennberg, P. O., Wofsy, S. C., Stephens, B. B., Fischer, M. L., Uchino, O., Abshire, J. B., Bernath, P., Biraud, S. C., Blavier, J.-F. L., Boone, C., Bowman, K. P., Browell, E. V., Campos, T., Connor, B. J., Daube, B. C., Deutscher, N. M., Diao, M., Elkins, J. W., Gerbig, C., Gottlieb, E., Griffith, D. W. T., Hurst, D. F., Jiménez, R., Keppel-Aleks, G., Kort, E. A., Macatangay, R., Machida, T., Matsueda, H., Moore, F., Morino, I., Park, S., Robinson, J., Roehl, C. M., Sawa, Y., Sherlock, V., Sweeney, C., Tanaka, T., and Zondlo, M. A.: Calibration of the Total Carbon Column Observing Network using aircraft profile data, Atmos. Meas. Tech., 3, 1351–1362, https://doi.org/10.5194/amt-3-1351-2010, 2010.
Wunch, D., Wennberg, P. O., Toon, G. C., Connor, B. J., Fisher, B., Osterman, G. B., Frankenberg, C., Mandrake, L., O'Dell, C., Ahonen, P., Biraud, S. C., Castano, R., Cressie, N., Crisp, D., Deutscher, N. M., Eldering, A., Fisher, M. L., Griffith, D. W. T., Gunson, M., Heikkinen, P., Keppel-Aleks, G., Kyrö, E., Lindenmaier, R., Macatangay, R., Mendonca, J., Messerschmidt, J., Miller, C. E., Morino, I., Notholt, J., Oyafuso, F. A., Rettinger, M., Robinson, J., Roehl, C. M., Salawitch, R. J., Sherlock, V., Strong, K., Sussmann, R., Tanaka, T., Thompson, D. R., Uchino, O., Warneke, T., and Wofsy, S. C.: A method for evaluating bias in global measurements of CO2 total columns from space, Atmos. Chem. Phys., 11, 12317–12337, https://doi.org/10.5194/acp-11-12317-2011, 2011.
Xueref-Remy, I., Messager, C., Filippi, D., Pastel, M., Nedelec, P., Ramonet, M., Paris, J. D., and Ciais, P.: Variability and budget of CO2 in Europe: analysis of the CAATER airborne campaigns – Part 1: Observed variability, Atmos. Chem. Phys., 11, 5655–5672, https://doi.org/10.5194/acp-11-5655-2011, 2011.