The NDACC welcomes as a Cooperating Network the Total Column Carbon Observing Network (TCCON). Though the primary data product is high precision total column CO2 several other gases are retrieved and archived as well. Sites for the network span the globe to provide diverse and targeted data for use as validation sites for the GOSAT and OCO-2 CO2 observing satellites as well as monitoring the seasonal cycle and long-term evolution of CO2. The network shares common methodologies, technical issues and membership with the NDACC/IRWG. The instruments are solar viewing Fourier transform spectrometers providing near-infrared spectra. Employing a network wide common retrieval technique and site specific aircraft calibrated retrievals the network aims to provide a temporally dense, globally consistent data coverage. Details and data can be found at