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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 33 — Nov. 20, 2007
  • pp: 8170–8180

Study of the statistics of water vapor mixing ratio determined from Raman lidar measurements

Pierre Bosser, Olivier Bock, Christian Thom, and Jacques Pelon  »View Author Affiliations


Applied Optics, Vol. 46, Issue 33, pp. 8170-8180 (2007)
http://dx.doi.org/10.1364/AO.46.008170


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Abstract

The statistical properties of atmospheric water vapor mixing ratio (WVMR) determined as the ratio of Raman lidar signals backscattered from water vapor and nitrogen molecules are studied. It is shown that WVMR estimates can be biased by a small percentage at low signal photon-counting rates due to fluctuations in the nitrogen signal in the denominator of the ratio, the magnitude of the bias being linked to the signal-to-noise ratio of the nitrogen signal. This is particularly important when unbiased estimates are required as in the case of climate studies and global positioning system (GPS) signal calibration. Different bias corrections and a modified ratio formulation are proposed in order to correct or eliminate this bias. The method is successfully applied in processing signals obtained with an experimental Raman lidar system devoted to calibrate GPS signals for slant path delays. It is shown to reduce biases into negligible values in both WVMR and wet path delay estimates in the range interval of 0–7 km.

© 2007 Optical Society of America

OCIS Codes
(010.3640) Atmospheric and oceanic optics : Lidar
(010.3920) Atmospheric and oceanic optics : Meteorology
(010.7030) Atmospheric and oceanic optics : Troposphere
(280.3640) Remote sensing and sensors : Lidar

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: June 20, 2007
Revised Manuscript: October 2, 2007
Manuscript Accepted: October 5, 2007
Published: November 19, 2007

Citation
Pierre Bosser, Olivier Bock, Christian Thom, and Jacques Pelon, "Study of the statistics of water vapor mixing ratio determined from Raman lidar measurements," Appl. Opt. 46, 8170-8180 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-33-8170


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