Total Carbon Column Observing Network (TCCON)

TCCON is a network of ground-based Fourier Transform Spectrometers recording direct solar spectra in the near infrared spectral region. From these spectra, accurate and precise column-averaged abundances of CO2, CH4, N2O, HF, CO, H2O, and HDO are retrieved and reported here. A technical report describing the GGG2014 version of the retrievals is found here; solar, Voigt telluric, and non-Voigt telluric spectral linelists used in the retrievals are publically available.

Data in netCDF format are publicly available no later than one year after the spectra are recorded; many sites release their data earlier. Citation and data use requirements are included in the license associated with each record. Column averaging kernels and a priori profiles are included in the files. Information on how to use these can be found here. To produce TCCON a priori profiles for locations and times where there are no TCCON measurements, a stand-alone program can be downloaded. A JSON file describing the correspondence between GGG2014 and GGG2020 public file variable names can be downloaded.


Please review the TCCON data use guidelines before downloading TCCON data. A tool is available to generate citations for TCCON data and sites in Bibtex format.

Sign up to the TCCON Users email list by sending an email to tccon-users-join@caltech.edu with the subject ‘subscribe’.

TCCON Column-Averaged Dry-Air Mole Fractions of CO2, CO, N2O, CH4, H2O, HDO, and HF






Site Start Date End Date
Bremen (DE) [bremen01] 2009-01-06 2021-06-24
Burgos [burgos01] 2017-03-03 2023-02-08
Caltech (US) [pasadena01] 2012-09-20 2023-09-19
Darwin (AU) [darwin01] 2013-01-01 2022-12-27
East Trout Lake [easttroutlake01] 2016-10-03 2023-10-29
Edwards (US) [edwards01] 2013-07-20 2023-09-27
Eureka (CA) [eureka01] 2010-07-25 2020-07-07
Four Corners (US) [fourcorners01] 2013-03-16 2013-10-03
Garmisch (DE) [garmisch01] 2007-07-18 2023-05-04
Hefei (PRC) [hefei01] 2015-11-02 2022-12-19
Harwell [harwell01] 2021-05-30 2023-09-30
Indianapolis (US) [indianapolis01] 2012-08-23 2012-12-01
Izana (ES) [izana01] 2014-01-02 2023-08-30
Jet Propulsion Laboratory (US) [jpl01] 2007-07-01 2008-06-23
Jet Propulsion Laboratory (US) [jpl02] 2011-05-19 2018-05-14
Karlsruhe (DE) [karlsruhe01] 2014-01-15 2023-06-26
Lauder (NZ) [lauder01] 2004-06-28 2010-02-19
Lauder (NZ) [lauder02] 2013-01-02 2018-09-30
Lauder (NZ) [lauder03] 2018-10-02 2023-03-31
Lamont (US) [lamont01] 2011-04-16 2023-09-30
Manaus (BR) [manaus01] 2014-09-30 2015-07-27
Nicosia (CY) [nicosia01] 2019-09-01 2023-02-21
Ny-Ålesund [nyalesund01] 2005-03-16 2022-09-22
Orléans (FR) [orleans01] 2009-09-06 2023-01-21
Paris (FR) [paris01] 2014-09-23 2023-08-08
Park Falls (US) [parkfalls01] 2004-06-02 2023-10-01
Réunion Island (RE) [reunion01] 2015-03-01 2020-07-18
Rikubetsu (JP) [rikubetsu01] 2014-06-24 2021-06-30
Saga (JP) [saga01] 2011-07-28 2022-10-14
Sodankylä (FI) [sodankyla01] 2009-05-16 2023-05-30
Tsukuba (JP) [tsukuba02] 2014-03-28 2021-03-31
Wollongong (AU) [wollongong01] 2013-01-04 2023-04-25
Xianghe [xianghe01] 2018-06-14 2023-01-27

The TCCON is closely affiliated with the Network for the Detection of Atmospheric Composition Change Infrared Working Group (NDACC-IRWG), that produces vertical profiles of the concentrations of many of the same gases and several others. For more information see the NDACC website.