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. As part of international efforts to monitor air quality,several satellite missions such as the Tropospheric Monitoring Instrument(TROPOMI) were deployed and others, like Tropospheric Emissions: MonitoringPollution (TEMPO), are planned for the near future. In support of thevalidation of these missions, major upgrades to the tropospheric ozone lidarlocated at the Jet Propulsion Laboratory Table Mountain Facility (TMF) wererecently performed. These modifications include the full automation of thesystem, which now allows unattended measurements during frequent satelliteoverpasses, and a new receiver that extends the measurement capabilities ofthe system down to 100 m above surface. The automation led to the systematic operation of the lidar during dailyTROPOMI overpasses, providing more than 139 reference profiles sinceJanuary 2018. Ozone profiles retrieved using the new lidar receiver werecompared to ozonesonde profiles obtained from a co-located tethered balloon.An agreement of about 5 % with the ozonesonde down to an altitude range of100 m a.g.l. was observed. Furthermore, the stability of the receiverconfiguration was investigated. Comparisons between the lowest pointretrieved by the lidar and a co-located surface ozone photometer showed nosign of drift over a 2-month test period and an agreement better than10 %. Finally, measurements from a 24 h intensive measurement periodduring a stratospheric intrusion event showed good agreement with two free-flying ozonesondes. These comparisons revealed localized differences betweensonde and lidar, possibly owing to the differing vertical resolutions(between 52 and 380 m for lidar and about 100 m for the sonde).

Upgrade and automation of the JPL Table Mountain Facility tropospheric ozone lidar (TMTOL) for near-ground ozone profiling and satellite validation