An empirical relationship is derived between the multiple-scattering fraction and the linear depolarization ratio by using Monte Carlo simulations of water clouds measured by backscatter lidar. This relationship is shown to hold for clouds having a wide range of extinction coefficients, mean droplet sizes, and droplet size distribution widths. The relationship is also shown to persist for various instrument fields of view and for measurements made within broken cloud fields. The results obtained from the Monte Carlo simulations are verified by using multiple-field-of-view lidar measurements. For space-based lidars equipped to measure linear depolarization ratios, this new relationship can be used to accurately assess signal perturbations due to multiple scattering within nonprecipitating water clouds.
© 2006 Optical Society of America
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
Original Manuscript: February 2, 2006
Revised Manuscript: March 26, 2006
Manuscript Accepted: March 27, 2006
Yongxiang Hu, Zhaoyan Liu, David Winker, Mark Vaughan, Vincent Noel, Luc Bissonnette, Gilles Roy, and Matthew McGill, "Simple relation between lidar multiple scattering and depolarization for water clouds," Opt. Lett. 31, 1809-1811 (2006)