9 October 2009 Comparison of lidar calibration at 1064-nm channel using the water-phase and cirrus clouds
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Abstract
Lidar calibration at the 1064-nm channel is explored by using the low-level water-phase cloud and high cirrus cloud. Based on a known constant of lidar ratio in the optically thick water cloud, the lidar calibration constant is estimated by integrating lidar returns in the cloud. By using wavelength independence of cirrus cloud backscatter, the lidar constant is analyzed with the two-wavelength signals ratio at 532-nm and 1064-nm after correcting aerosol transmittance from sunphotometer measurement. Calibration constants by these two separate methods are compared on the same day and show consistency with the relative difference of less than 30% in general. We further verify the calibration constant by regressing lidar signals with calibrated ceilometer data in the low planetary boundary layer (PBL). Moreover, the calibration result is tested by applying it to estimate aerosol backscatter at 1064-nm and Angstrom exponent. In the end, normalized daily averages of lidar constants over two-month period are presented.
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Yonghua Wu, Yonghua Wu, Shuki Chaw, Shuki Chaw, Barry Gross, Barry Gross, Fred Moshary, Fred Moshary, Sam Ahmed, Sam Ahmed, } "Comparison of lidar calibration at 1064-nm channel using the water-phase and cirrus clouds", Proc. SPIE 7479, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing V, 74790V (9 October 2009); doi: 10.1117/12.830643; https://doi.org/10.1117/12.830643
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