Polarization lidar: An extended three-signal calibration approach

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Date
2019
Volume
12
Issue
2
Journal
Series Titel
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Publisher
Göttingen : Copernicus GmbH
Abstract

We present a new formalism to calibrate a threesignal polarization lidar and to measure highly accurate height profiles of the volume linear depolarization ratios under realistic experimental conditions. The methodology considers elliptically polarized laser light, angular misalignment of the receiver unit with respect to the main polarization plane of the laser pulses, and cross talk among the receiver channels. A case study of a liquid-water cloud observation demonstrates the potential of the new technique. Long-term observations of the calibration parameters corroborate the robustness of the method and the long-term stability of the three-signal polarization lidar. A comparison with a second polarization lidar shows excellent agreement regarding the derived volume linear polarization ratios in different scenarios: A biomass burning smoke event throughout the troposphere and the lower stratosphere up to 16 km in height, a dust case, and also a cirrus cloud case.

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Keywords
biomass burning, calibration, cirrus, detection method, equipment, experimental study, laser method, lidar, methodology, parameter estimation, smoke, stratosphere, troposphere
Citation
Jimenez, C., Ansmann, A., Engelmann, R., Haarig, M., Schmidt, J., & Wandinger, U. (2019). Polarization lidar: An extended three-signal calibration approach. 12(2). https://doi.org//10.5194/amt-12-1077-2019
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License
CC BY 4.0 Unported