TMF Tropospheric Ozone Lidar (a.k.a. TMTOL)
This Differential Absorption ozone Lidar (DIAL) was designed in the early 1990s to contribute measurements of tropospheric ozone and aerosols to the Network for the Deteciton of Atmospheric Composition Change (NDACC). It was reconfigured and optimized in 1998 for tropospheric ozone exclusively, then upgraded in 2018 to measure at ranges as close as 100-m above ground and contribute to the Tropospheric Ozone Lidar Network (TOLNet). Routine data acquisition started in 1999 and the instrument has since measured over 2500 tropospheric ozone profiles.
The system uses the Rayleigh scattering technique, and includes 6 receiving channels (3 channels operating at the ozone-absorbed wavelength of 289 nm and 3 channels at the weakly-absorbed wavelength of 299 nm). The tropospheric ozone DIAL pair 289/299 nm allows ozone retrievals between the altitudes of 2.6 km and 20 km. To extend the vertical range upward, the signal received from either the 308 or 355 nm (low-range) channel of our co-located stratospheric DIAL is used with the (upper range) 299 nm of the tropospheric ozone system to form a hybrid DIAL pair allowing ozone to be retrieve in the lower stratosphere (12-27 km).
- Instrument vertical resolution: 75-m until 2012, 7.5-m since 2012
- Vertical range: ozone: 2.5-25 km
- Instrument temporal resolution: Anything from 5-min to 2-hours, depending on the application
- Typical measurement frequency: 3-5 times per week, mainly nighttime, occasionally daytime
- Occasionally run for multiple consecutive days for case studies and campaigns
- Typical total number of measurements per year: 200.
McDermid, I. S., G. Beyerle, D. A. Haner, and T. Leblanc, "Redesign and improved performance of the tropospheric ozone lidar at the jet propulsion laboratory table mountain facility," Appl. Opt. 41, 7550-7555 (2002), https://doi.org/10.1364/AO.41.007550
Chouza, F., Leblanc, T., Brewer, M., and Wang, P.: Upgrade and automation of the JPL Table Mountain Facility tropospheric ozone lidar (TMTOL) for near-ground ozone profiling and satellite validation, Atmos. Meas. Tech., 12, 569-583, https://doi.org/10.5194/amt-12-569-2019, 2019