CHARMS

Multiwavelength lidar data were collected during the Combined HSRL and Raman lidar Measurement Study (CHARMS) IOP, which occurred during July through September 2105 at SGP.  During CHARMS the University of Wisconsin HSRL was located at SGP and acquired aerosol backscatter profiles at 532 nm and 1064 nm, and aerosol extinction and depolarization profiles at 532 nm.  The HSRL aerosol profiles, when combined with the aerosol backscatter and extinction profiles (355 nm) collected by the SGP Raman lidar, provide a suite of three aerosol backscatter (355, 532, 1064 nm) and two aerosol extinction (355, 532 nm) profiles for use in advanced aerosol microphysical retrievals. The PI product “CHARMS Combined Data Set” (https://dis.arm.gov/data/pi/130) contains these multiwavelength lidar measurements.  Currently the 1064 nm backscatter calibration has been computed for 25 days during the CHARMS period; subsequent aerosol microphysical retrievals are restricted to these 25 days. These multiwavelength lidar data were used to derive profiles of aerosol optical and microphysical properties (effective radius, concentration, fine mode fraction) using an automated, unsupervised 3β+2α algorithm. This data set contains the results of this algorithm.

• Aerosol concentration