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.