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. Column averaging kernels and a priori profiles are included in the files. Information on how to use these can be found here.
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. Please review these before downloading the data.
The following documents provide additional information about the TCCON products:
- Instructions to use the column averaging kernels and a priori profiles
- A report describing the GGG2020 version of the retrievals and their comparison to the previous version
- A report on the impact of the change in prior meteorology starting 1 Apr 2024
- The ESSD paper on GGG2020
- A report describing the previous (GGG2014) version of the retrievals
- A JSON file describing the correspondence between GGG2014 and GGG2020 public file variable names
To produce TCCON a priori profiles for locations and times where there are no TCCON measurements, a stand-alone program can be downloaded.
Additionally, the GGG2020 linelists are available for download:
Sign up to the TCCON Users email list by sending an email to tccon-users-join@caltech.edu with the subject ‘subscribe’.