Total Carbon Column Observing Network (TCCON)

TCCON Data Archive

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. The HF and HDO retrievals are uncalibrated and hence preliminary. Data are updated monthly on the first of the month. The data become publicly available no later than one year after the measurements are recorded, and many sites choose to release their data much sooner.

For the latest TCCON information, please visit the TCCON Wiki. For citation information and our data policy, please see our Data Use Policy. For site-specific information and data analysis descriptions, please read the Data Description. Auxiliary data (column averaging kernels, a priori profiles) are included in the netCDF files provided below. Information on how to use our column averaging kernels and a priori profiles can be found on our Auxiliary Data page.

The TCCON is closely affiliated with the Network for the Detection of Atmospheric Composition Change Infrared Working Group (NDACC-IRWG). In contrast with TCCON, which produces column-averaged dry-air mole fractions, the NDACC produces vertical profiles of the concentrations of many of the same gases and several others. The NDACC website and links to their database can be found at

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

Site Start Date End Date
Park Falls (parkfalls01) 2004-05-26 Ongoing
Lamont (lamont01) 2008-07-06 Ongoing
Wollongong (wollongong01) 2008-06-26 Ongoing
Darwin (darwin01) 2005-08-28 Ongoing
Orléans (orleans01) 2009-08-29 Ongoing
Białystok (bialystok01) 2009-03-01 Ongoing
Bremen (bremen01) 2005-01-06 Ongoing
Ny-Ålesund (nyalesund01) 2005-03-14 Ongoing
JPL2007 (jpl01) 2007-07-01 2008-06-22
JPL2011 (jpl02) 2011-12-08 2013-03-31
Reunion Island/Île de La Réunion (reunion01) 2011-10-06 Ongoing
Garmisch (garmisch01) 2007-07-16 Ongoing
Lauder120HR (lauder01) 2004-06-20 2011-02-28
Lauder125HR (lauder02) 2010-02-02 Ongoing
Tsukuba120HR (tsukuba01) 2008-12-25 2010-03-22
Tsukuba125HR (tsukuba02) 2011-08-04 Ongoing
Karlsruhe (karlsruhe01) 2010-04-19 Ongoing
Ascension Island (ascension01) 2012-05-22 Ongoing
Eureka (eureka01) 2010-07-24 Ongoing
Sodankylä (sodankyla01) 2009-02-06 Ongoing
Izaña (izana01) 2007-05-18 Ongoing
Indianapolis/InFLUX (indianapolis01) 2012-08-23 2012-12-01
Edwards/Dryden/Armstrong (edwards01) 2013-07-20 Ongoing
Saga (saga01) 2011-07-28 Ongoing
Four Corners (fourcorners01) 2011-03-01 2013-09-30
Pasadena/Caltech (pasadena01) 2012-09-20 Ongoing