Abstract
The Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) has been measuring atmospheric composition by solar occultation from low Earth orbit since 2004. A new version (4.0) of ACE-FTS processing has added low altitude CO2 as a routine data product. ACE provides a near global data set of altitude profiles of CO2 volume mixing ratios (VMRs) on a 1 km grid from 5 to 18 km. We provide an initial evaluation of these data using occultations from the month of May for 2004–2017 in the 55°–70°S latitude range. Comparisons are made with ground-based measurements at Macquarie Island, the South Pole, the CarbonTracker 2017 model and G. Toon's empirical model. Agreement for trends is good, but ACE-FTS VMRs have a low bias at 5.5 and 6.5 km in altitude.
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