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 GGG2020 version of the retrievals and their comparison to the previous version is found
here;
solar,
Voigt telluric, and non-Voigt telluric
spectral
linelists used in the retrievals are publically available. A technical report
describing the previous (GGG2014) version
of the retrievals is 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. 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.
Sign up to the TCCON Users email list by sending an email to tccon-users-join@caltech.edu with the subject ‘subscribe’.