Ozone Profiling Atmospheric Lidar (OPAL)
The OPAL lidar mobile laboratory at the 1999 Atlanta EPA SuperSite.
Comparison of OPAL and in situ measurements at three locations.
Applications
- Ozone formation/evolution monitoring
- Ozone transport studies
- Aerosol in polluted areas
Basic Parameters Measured
- Ozone concentration profiles
- Particle backscatter profiles
Field Projects
| NEAQS (New England Air Quality Study) | July/August 2002 | New Hampshire |
| Aircraft Plume Study | May 2001 | |
| TexAQS (Texas Air Quality Study) | August/September 2000 | Houston, Texas |
| SOS Atlanta SuperSite (Southern Oxidants Study) | August 1999 | Atlanta, Georgia |
| SOS 99 (Southern Oxidants Study) | June/July 1999 | Nashville, Tennsessee |
| SCOS (Southern California Ozone Study) | June-October 1997 | El Monte, California |
| LIFT (Lidars In Flat Terrain) | August 1996 | Champain/Urbana, Illinois |
| Victorville Ozone Transport Experiment | August 1995 | Victorville, California |
| LAFRS (Los Angeles Free Radical Study) | September 1993 | Los Angeles, California |
| Davis Intercomparison Experiment | July 1993 | Davis, California |
Typical Specifications
| Wavelength | 266 nm | 289 nm | 299 nm | 355 nm | |
| Pulse energy | 6 mJ | 2 mJ | 2 mJ | 6 mJ | |
| Pulse rate | 1 - 10 Hz | ||||
| Scanning Directions | Vertical, horizontal, and in a single vertical plane | ||||
| Minimum range | 60 m | ||||
| Aerosol | |||||
| Maximum range | 1.5 - 3 km | 6 - 7 km | 6 - 7 km | 9 km | |
| Range Resolution | 15 m | ||||
| Ozone | |||||
| Maximum range | 3 km | ||||
| Range Resolution | below 1 km: 60 - 90 m 1 - 2 km: 100 - 150 m 2 - 3 km: 150 - 300 m |
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| Accuracy | Better than +/- 10 ppb | ||||
Specifications were different before 1999.
Contact: Wynn Eberhard
References
Zhao, Y., R.D. Marchbanks, and R.M. Hardesty, "CSD (formerly the Environmental Technology Laboratory)'s Transportable Lower Troposphere Ozone Lidar and Its Applications in Air Quality Studies." 42nd SPIE Annual meeting, Application of Lidar to Current Atmospheric Topics II, Proceedings of SPIE #3127, July 1997, 53-62.
Zhao, Y., R.M. Hardesty, and J.E. Gaynor, "Demonstration of a new and Innovative Ozone Lidar's Capability to Measure Vertical Profiles of Ozone Concentration and Aerosol in the Lower Troposphere." Final report to the California Air Resources Board, December 1994.
Zhao, Y., R.M. Hardesty and M.J. Post, "A Multibeam Transmitter for Signal Dynamic Range Reduction in Incoherent Lidar Systems." Applied Optics 45:7623-7632 (1992).
Zhao, Y., J.N. Howell, and R.M. Hardesty, "Transportable Lidar for the Measurement of Ozone Concentration and Aerosol Profiles in the Lower Troposphere." A&WMA/SPIE International Symposium on Optical Sensing for Environmental Monitoring, October 11-14, 1993, Atlanta, Georgia, 310-320.