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<p>A series of attenuated atmospheric backscatter profiles were measured at 1572 nm by the CO<span class="inline-formula">₂</span> Sounder lidar during the eight flights of the 2017 ASCENDS/ABoVE (Active Sensing of CO<span class="inline-formula">₂</span> Emission over Nights, Days, and Seasons, Arctic Boreal Vulnerability Experiment) airborne campaign. In addition to measuring the column average CO<span class="inline-formula">₂</span> mixing ratio from the laser signals reflected by the ground, the CO<span class="inline-formula">₂</span> Sounder lidar also recorded the height-resolved attenuated atmospheric backscatter profiles beneath the aircraft. We have recently processed these vertical profiles with a 15 m vertical spacing and 1 s integration time along the flight path (<span class="inline-formula">∼</span> 200 m) for all the 2017 flights and have posted the results at NASA Distributed Active Archive Center (DAAC) for Biogeochemical Dynamics <a href="https://doi.org/10.3334/ORNLDAAC/2051">https://doi.org/10.3334/ORNLDAAC/2051</a> (Sun et al., 2022). This paper describes the measurement principles, the data processing technique, and the signal to noise ratios.</p>