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Depolarization and Backscatter Unattended Lidar (DABUL)
DABUL operates automatically from its own weatherproof housing, with
remote control and data download through a communications link.
NOAA/ETL and the University of Maryland - Baltimore County's Physics
Department are collaborating to develop and deploy a long-term, unattended
infrared spectroradiometer and lidar to monitor and study the radiative
effects of water vapor, aerosols, and thin clouds in the upper troposphere.
The infrared spectro-radiometer will measure atmospheric emitted spectral
radiance over the wavelength range of about 3-23 micrometers, while the
lidar will detect clouds and aerosol layers.
Applications:
- Cloud Geometry
- Cloud Phase
- Aerosol Scattering Ratio
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- Extinction Profiles
- Optical Depth
- Mixed Layer Height
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Field Projects:
Basic Parameters Measured:
- Molecular & Particle Backscatter
- Depolarization Ratio
Typical Operating Specifications:
Wavelength
| 523 nm |
Pulse energy
| 25 µJ |
Pulse rate |
2000 Hz |
Average Time: |
1 to 10 s |
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Scan |
180 ° in elevation angle |
Range Resolution: |
30 m |
Minimum range |
60 m |
Maximum range |
40 km |
References:
Eberhard, W.L., R.A. Alvarez, J.M. Intrieri, S.P. Sandburg, K.W. Koenig,
and K.R. Healy, "Automated All-Weather Lidar with Scanning Option."
Proceedings, 19th International Laser Radar Conference, July 6-10,
1998, Annapolis, MD., 639-642 (1998).
Alvarez, R.J., W.L. Eberhard, J.M. Intrieri, C.J. Grund, and S.P.
Sandberg, "A depolarization and backscatter lidar for unattended
operation in varied meteorological conditions." Proceedings, 10th
Symposium on Meterological Observations and Instrumentation, January 11-16,
1998, Phoenix, AZ. American Meterological Society, Boston, MA. (1998).
Grund, C.J., and S.P. Sandberg, "Depolarization and Backscatter Lidar
for Unattended Operation." Proceedings, 18th International Laser Radar
Conference, July 22-26, 1996, Berlin, Germany, A. Ansmann et al. ed.,
Springer, 3-6. (1996).
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