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Derivation of tropospheric methane from TCCON CH₄ and HF total column observations

Saad, K. M. and Wunch, D. and Toon, G. C. and Bernath, P. and Boone, C. and Connor, B. and Deutscher, N. M. and Griffith, D. W. T. and Kivi, R. and Notholt, J. and Roehl, C. and Schneider, M. and Sherlock, V. and Wennberg, P. O. (2014) Derivation of tropospheric methane from TCCON CH₄ and HF total column observations. Atmospheric Measurement Techniques, 7 (9). pp. 2907-2918. ISSN 1867-8548.

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The Total Carbon Column Observing Network (TCCON) is a global ground-based network of Fourier transform spectrometers that produce precise measurements of column-averaged dry-air mole fractions of atmospheric methane (CH₄). Temporal variability in the total column of CH₄ due to stratospheric dynamics obscures fluctuations and trends driven by tropospheric transport and local surface fluxes that are critical for understanding CH₄ sources and sinks. We reduce the contribution of stratospheric variability from the total column average by subtracting an estimate of the stratospheric CH₄ derived from simultaneous measurements of hydrogen fluoride (HF). HF provides a proxy for stratospheric CH₄ because it is strongly correlated to CH₄ in the stratosphere, has an accurately known tropospheric abundance (of zero), and is measured at most TCCON stations. The stratospheric partial column of CH₄ is calculated as a function of the zonal and annual trends in the relationship between CH₄ and HF in the stratosphere, which we determine from ACE-FTS satellite data. We also explicitly take into account the CH₄ column averaging kernel to estimate the contribution of stratospheric CH₄ to the total column. The resulting tropospheric CH₄ columns are consistent with in situ aircraft measurements and augment existing observations in the troposphere.

Item Type:Article
Related URLs:
URLURL TypeDescription
Saad, K. M.0000-0002-2501-6223
Wunch, D.0000-0002-4924-0377
Toon, G. C.0000-0003-4174-7541
Deutscher, N. M.0000-0002-2906-2577
Griffith, D. W. T.0000-0002-7986-1924
Kivi, R.0000-0001-8828-2759
Roehl, C.0000-0001-5383-8462
Wennberg, P. O.0000-0002-6126-3854
Additional Information:© Author(s) 2014. This work is distributed under the Creative Commons Attribution 3.0 License. Received: 15 Feb 2014 – Discussion started: 07 Apr 2014 – Revised: 18 Jul 2014 – Accepted: 06 Aug 2014 – Published: 10 Sep 2014. Support for this research was received from NASA’s Carbon Cycle Science program (NNX10AT83G, James Randerson, PI). Part of this work was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. US funding for TCCON comes from NASA grants NNX11AG01G, NAG5-12247, NNG05-GD07G, and NASA Orbiting Carbon Observatory Program. We are grateful to the DOE ARM program for technical support in Lamont and Darwin and Jeff Ayers for technical support in Park Falls. European funding is from GEOMON, InGOS, and IMECC. From 2004 to 2011 the Lauder TCCON program was funded by the New Zealand Foundation of Research Science and Technology contracts CO1X0204, CO1X0703 and CO1X0406. Since 2011 the program has been funded by NIWA’s Atmosphere Research Programme 3 (2011/13 Statement of Corporate Intent). Australian funding is from the Australian Research Council, DP0879468 and LP0562346. Funding for the ACE-FTS mission is primarily provided by the Canadian Space Agency. NCEP Reanalysis data are provided by NOAA/OAR/ESRL PSD. SGP aircraft flask data were obtained through the ARM Program sponsored by the US Department of Energy, Office of Science, Office of Biological and Environmental Research and were generated by NOAA-ESRL, Carbon Cycle Greenhouse Gases Group. Baring Head NIWA surface data were provided courtesy of Gordon Brailsford, Dave Lowe and Ross Martin. We would also acknowledge the contributions of in situ vertical profiles from the HIPPO, IMECC, INTEX, Learjet, and START08 campaigns. Color schemes for Figs. 1 and 3 are from Brewer, Cynthia A., 200x. Edited by: G. Stiller
Funding AgencyGrant Number
Orbiting Carbon Observatory (OCO)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
New Zealand Foundation of Research Science and TechnologyCO1X0204
New Zealand Foundation of Research Science and TechnologyCO1X0703
New Zealand Foundation of Research Science and TechnologyCO1X0406
National Institute of Water and Atmospheric Research (NIWA)UNSPECIFIED
Australian Research CouncilDP0879468
Australian Research CouncilLP0562346
Canadian Space Agency (CSA)UNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20200529-093432972
Persistent URL:
Official Citation:Saad, K. M., Wunch, D., Toon, G. C., Bernath, P., Boone, C., Connor, B., Deutscher, N. M., Griffith, D. W. T., Kivi, R., Notholt, J., Roehl, C., Schneider, M., Sherlock, V., and Wennberg, P. O.: Derivation of tropospheric methane from TCCON CH4 and HF total column observations, Atmos. Meas. Tech., 7, 2907–2918,, 2014.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103553
Deposited By: George Porter
Deposited On:01 Jun 2020 14:26
Last Modified:01 Jun 2020 14:26

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