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.
CHARMS
charms > CHARMS Multiwavelength lidar aerosol retrievalData Source Type(s) > PI
Purpose
Recent advances in both lidar retrieval theory and algorithm development demonstrate that vertically resolved retrievals using such multi-wavelength lidar measurements of aerosol backscatter and extinction can help constrain both the aerosol optical (e.g., complex refractive index, scattering, etc.) and microphysical properties (e.g., effective radius, concentrations) as well as provide qualitative aerosol classification. Based on this work, the NASA Langley Research Center (LaRC) HSRL group developed automated algorithms for classifying and retrieving aerosol optical and microphysical properties, demonstrated these retrievals using data from the unique NASA/LaRC airborne multi-wavelength HSRL-2 system, and validated the results using coincident airborne in situ data. The CHARMS data set was collected to attempt similar retrievals using ground-based lidar data at SGP.
Primary Measurements
Data Details
| Contact | Richard Ferrare |
| Resource(s) |
Data Directory ReadMe |
| Data format | hdf5 |
| Content time range | 1 August 2015 - 29 September 2015 |
| Attribute accuracy | No formal attribute accuracy tests were conducted. |
| Positional accuracy | No formal positional accuracy tests were conducted. |
| Data Consistency and Completeness | Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. |
| Access Restriction | No access constraints are associated with this data. |
| Use Restriction | No use constraints are associated with this data. |
| File naming convention | sgp 10 min charms data yyymmddtttt 10 min resol 120 m vertical resolution aerosol microphysics TiARA algorithm for public release |
| Citations | https://www.osti.gov/scitech/biblio/1333926-charms-combined-data-set |