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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 21 — Jul. 20, 2011
  • pp: 3987–3999

Calibration of the 1064 nm lidar channel using water phase and cirrus clouds

Yonghua Wu, Chuen Meei Gan, Lina Cordero, Barry Gross, Fred Moshary, and Sam Ahmed  »View Author Affiliations


Applied Optics, Vol. 50, Issue 21, pp. 3987-3999 (2011)
http://dx.doi.org/10.1364/AO.50.003987


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Abstract

Calibration is essential to derive aerosol backscatter coefficients from elastic scattering lidar. Unlike the visible UV wavelengths where calibration is based on a molecular reference, calibration of the 1064 nm lidar channel requires other approaches, which depend on various assumptions. In this paper, we analyze two independent calibration methods which use (i) low-altitude water phase clouds and (ii) high cirrus clouds. In particular, we show that to achieve optimal performance, aerosol attenuation below the cloud base and cloud multiple scattering must be accounted for. When all important processes are considered, we find that these two independent methods can provide a consistent calibration constant with relative differences less than 15%. We apply these calibration techniques to demonstrate the stability of our lidar on a monthly scale, along with a natural reduction of the lidar efficiency on an annual scale. Furthermore, our calibration procedure allows us to derive consistent aerosol backscatter coefficients and angstrom coefficient profiles ( 532 1064 nm ) along with column extinction-to-backscatter ratios which are in good agreement with sky radiometer inversions.

© 2011 Optical Society of America

OCIS Codes
(010.3640) Atmospheric and oceanic optics : Lidar
(280.3640) Remote sensing and sensors : Lidar
(010.1615) Atmospheric and oceanic optics : Clouds

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: November 22, 2010
Revised Manuscript: May 24, 2011
Manuscript Accepted: May 24, 2011
Published: July 14, 2011

Citation
Yonghua Wu, Chuen Meei Gan, Lina Cordero, Barry Gross, Fred Moshary, and Sam Ahmed, "Calibration of the 1064 nm lidar channel using water phase and cirrus clouds," Appl. Opt. 50, 3987-3999 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-21-3987

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