Scanning tropospheric ozone and aerosol lidar with double-gated photomultipliers
2009
The
OzoneProfiling
Atmospheric Lidaris a scanning four-wavelength ultraviolet differential absorption
lidarthat measures
tropospheric ozoneand
aerosols. Derived profiles from the
lidardata include
ozoneconcentration,
aerosolextinction, and calibrated
aerosolbackscatter.
Aerosolcalibrations assume a clear air region aloft. Other products include
cloud baseheights,
aerosollayer heights, and scans of particulate plumes from aircraft. The
aerosoldata range from 280 m to 12 km with 5 m range resolution, while the
ozonedata ranges from 280 m to about 1.2 km with 100 m resolution. In horizontally homogeneous atmospheres, data from multiple-elevation angles is combined to reduce the minimum altitude of the
aerosoland
ozoneprofiles to about 20 m. The
lidardesign, the characterization of the
photomultipliertubes,
ozoneand
aerosolanalysis techniques, and sample data are described. Also discussed is a double-gating technique to shorten the gated turn-on time of the
photomultipliertubes, and thereby reduce the detection of background light and the outgoing laser pulse.
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