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Lidar Remote Sensing of Cirrus Clouds at the Southern Great Plains Site: Comparisons of Extinction and Backscatter Coefficients Derived Using Raman and Backscatter Lidar Technique

Comstock, J.M.(a), Fu, Q.(b), Turner, D.D.(c), and Ackerman, T.P.(a), Pacific Northwest National Laboratory (a), Department of Atmospheric Sciences, University of Washington (b), University of Wisconsin/Pacific Northwest National Laboratory(c)
Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting

Horizontal and vertical inhomogeneity of cirrus clouds is an important issue in radiation modeling and the representation of cirrus clouds in general circulation models (GCMs). Lidar remote sensing is a useful tool for determining the vertical structure of cirrus clouds. Backscatter lidars, which are commonly used in cloud and aerosol studies, estimate layer integrated quantities such as mean layer optical depth and extinction coefficient. This is primarily due to the assumption that the backscatter-to-extinction ratio is constant with height. Using the Raman technique, we can determine vertical profiles of extinction and backscatter coefficient independently. In this study, we compare extinction and backscatter coefficients for cirrus clouds derived using both Raman and backscatter techniques. In addition, we present a case study from the March 2000 Cloud Intensive Observation Period that uses up-to-date single-scattering and microphysical properties to calculate radiative fluxes. This case will help de

Note: This is the poster abstract presented at the meeting; an extended version was not provided by the author(s).