The Total Carbon Column Observing Network's GGG2020 data version

The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs), beginning in 2004, from over 30 current or past measurement sites around the world using solar absorption spectroscopy in the near-infrared (near-IR) region. TCCON GHG data have been used extensively for multiple purposes, including in studies of the carbon cycle and anthropogenic emissions, as well as to validate and improve observations from space-based sensors. Here, we describe an update to the retrieval algorithm used to process the TCCON near-IR solar spectra and to generate the associated data products. This version, called GGG2020, was initially released in April 2022. It includes updates and improvements to all steps of the retrieval, including but not limited to the conversion of the original interferograms into spectra, the spectroscopic information used in the column retrieval, post hoc air mass dependence correction, and scaling to align with the calibration scales of in situ GHG measurements. All TCCON data are available through https://tccondata.org/ (last access: 22 April 2024) and are hosted on CaltechDATA (https://data.caltech.edu/, last access: 22 April 2024). Each TCCON site has a unique DOI for its data record. An archive of all the sites' data is also available with the DOI 10.14291/TCCON.GGG2020 . The hosted files are updated approximately monthly, and TCCON sites are required to deliver data to the archive no later than 1 year after acquisition. Full details of data locations are provided in the "Code and data availability" section.

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Related Links

Related Dataset #1 : 2020 TCCON Data Release

Related Dataset #2 : Atmospheric Voigt Line List for the TCCON 2020 Data Release

Related Dataset #3 : TCCON data from Jet Propulsion Laboratory (US), 2011, Release GGG2020.R0

Related Dataset #4 : TCCON data from Lauder (NZ), Release GGG2020.R0

Related Dataset #5 : TCCON data from Ny-Ålesund, Svalbard (NO), Release GGG2020.R0

Related Dataset #6 : TCCON data from Orléans (FR), Release GGG2020.R0

Related Dataset #7 : TCCON data from Tsukuba (JP), 125HR, Release GGG2020.R0

Related Dataset #8 : TCCON data from Xianghe, China, Release GGG2020.R0

Related Dataset #9 : NOAA AirCore atmospheric sampling system profiles

Related Dataset #10 : Trends in globally-averaged CO2 determined from NOAA Global Monitoring Laboratory measurements.

Related Dataset #11 : Nitrous Oxide (N2O) hemispheric and global monthly means from the NOAA/GML halocarbons program.

Related Dataset #12 : Earth System Research Laboratory Carbon Cycle and Greenhouse Gases Group Flask-Air Sample Measurements of CO2 at Global and Regional Background Sites, 1967-Present

Related Dataset #13 : Multi-laboratory compilation of atmospheric carbon dioxide data for the period 1957-2018; obspack_co2_1_GLOBALVIEWplus_v5.0_2019_08_12

Related Dataset #14 : Multi-laboratory compilation of atmospheric carbon dioxide data for the period 1957-2018; obspack_ch4_1_GLOBALVIEWplus_v2.0_2020_04_24

Related Dataset #15 : Multi-laboratory compilation of atmospheric carbon dioxide data for the period 1957-2020; obspack_co2_1_GLOBALVIEWplus_v7.0_2021-08-18

Related Dataset #16 : Earth System Research Laboratory Carbon Cycle and Greenhouse Gases Group Flask-Air Sample Measurements of CO2, CH4, CO, N2O, H2, and SF6 from the Aircraft Program, 1992-Present

Related Software #1 : TCCON/GGG – GGG2020
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Author Laughner, J. L.
Toon, G. C.
Mendonca, J.
Petri, C.
Roche, S.
Wunch, D.
Blavier, J.
Griffith, D. W. T.
Heikkinen, P.
Keeling, R. F.
Kiel, M.
Kivi, R.
Roehl, C. M.
Stephens, Britton
Baier, B. C.
Chen, H.
Choi, Y.
Deutscher, N. M.
DiGangi, J. P.
Gross, J.
Herkommer, B.
Jeseck, P.
Laemmel, T.
Lan, X.
McGee, E.
McKain, K.
Miller, J.
Morino, I.
Notholt, J.
Ohyama, H.
Pollard, D. F.
Rettinger, M.
Riris, H.
Rousogenous, C.
Sha, M. K.
Shiomi, K.
Strong, K.
Sussmann, R.
Té, Y.
Velazco, V. A.
Wofsy, S. C.
Zhou, M.
Wennberg, P. O.
Publisher UCAR/NCAR - Library
Publication Date 2024-05-06T00:00:00
Digital Object Identifier (DOI) Not Assigned
Alternate Identifier N/A
Resource Version N/A
Topic Category geoscientificInformation
Progress N/A
Metadata Date 2025-07-10T20:02:16.173457
Metadata Record Identifier edu.ucar.opensky::articles:27208
Metadata Language eng; USA
Suggested Citation Laughner, J. L., Toon, G. C., Mendonca, J., Petri, C., Roche, S., Wunch, D., Blavier, J., Griffith, D. W. T., Heikkinen, P., Keeling, R. F., Kiel, M., Kivi, R., Roehl, C. M., Stephens, Britton, Baier, B. C., Chen, H., Choi, Y., Deutscher, N. M., DiGangi, J. P., Gross, J., Herkommer, B., Jeseck, P., Laemmel, T., Lan, X., McGee, E., McKain, K., Miller, J., Morino, I., Notholt, J., Ohyama, H., Pollard, D. F., Rettinger, M., Riris, H., Rousogenous, C., Sha, M. K., Shiomi, K., Strong, K., Sussmann, R., Té, Y., Velazco, V. A., Wofsy, S. C., Zhou, M., Wennberg, P. O.. (2024). The Total Carbon Column Observing Network's GGG2020 data version. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d77p93mx. Accessed 28 August 2025.

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