OCO-2 target-mode observations and comparison to TCCON

NASA's Orbiting Carbon Observatory 2 (OCO-2) has been successfully measuring column-averaged dry-air mole fractions of carbon dioxide (XCO2) in the Earth's atmosphere for more than three years. These space-based measurements are compared to ground-based observations from the Total Carbon Column Observing Network (TCCON). The TCCON is a global network of high resolution ground-based Fourier Transform Spectrometers that record spectra of the sun in the near-infrared spectral region. From these spectra, accurate and precise column-averaged abundances of atmospheric constituents including CO2 are retrieved. The OCO-2 target mode allows the satellite to turn and stare at a TCCON station as it passes overhead, providing information about the quality, biases, and errors in the OCO-2 data. In this work, we will present the latest update on comparisons between OCO-2 and TCCON data including the OCO-2 v8 dataset.