New atmospheric gas retrievals using the GGG2020 version of the Total Carbon Column Observing Network (TCCON) dataset are significantly improved compared with the previous GGG2014 data version. The GGG2020 retrievals have lower variability across the network, better spectral fits, and smaller biases. The exception to this is XCH4 , which is, on ...

The Total Carbon Column Observing Network (TCCON) is a network of ground-based Fourier Transform Spectrometers that record direct solar absorption spectra of the atmosphere in the near-infrared. From these spectra, accurate and precise column-averaged abundances of atmospheric constituents including CO2, CH4, N2O, HF, CO, H2O, and HDO, are retri...