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The OPAL lidar mobile laboratory at the 1999 Atlanta EPA SuperSite.
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Comparison of OPAL and in situ measurements at 3 locations.
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Nd:YAG-Based Ozone Profiling Atmospheric Lidar (OPAL)
Applications
- Ozone formation/evolution monitoring
- Ozone transport studies
- Aerosol in polluted areas
Field Projects
Basic Parameters Measured
- Ozone concentration profiles
- Particle backscatter profiles
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 |
Transmitter Configuration |
Multibeam |
Single beam |
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 |
Accuracy: | Better than +/- 10 ppb |
Specifications were different before 1999.
References
Zhao, Y., R.D. Marchbanks, and R.M. Hardesty,
"ETL'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.
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