Abstract
The ratio of millimeter radar and High Spectral Resolution Lidar (HSRL) backscatter are used to determine drizzle rates which are compared to conventional ground based measurements. The robustly calibrated HSRL backscatter cross section provides advantages over measurements made with traditional lidars.
Highlights
Marine stratus clouds are an important feature of the global climate system
Measurements made with conventional lidar are hampered by: 1) changes in the transmission of the output window caused by water accumulation, 2) the difficulty of correcting the backscatter signal for atmospheric extinction, 3) the effects of multiple scattering, and 4) the need to convert backscatter measurements to extinction
The use of High Spectral Resolution Lidar (HSRL) data avoids many of these problems
Summary
Marine stratus clouds are an important feature of the global climate system. Cloud lifetime is sensitive to drizzle rates. Measurements made with conventional lidar are hampered by: 1) changes in the transmission of the output window caused by water accumulation, 2) the difficulty of correcting the backscatter signal for atmospheric extinction, 3) the effects of multiple scattering, and 4) the need to convert backscatter measurements to extinction. The use of High Spectral Resolution Lidar (HSRL) data avoids many of these problems. HSRL backscatter measurements are referenced to the known molecular scattering cross-section at each point in the profile and are independent of changes in window and atmospheric transmission. This ratio can be computed for our size distribution using Mie theory backscatter efficiencies QbsRadar for radar and QbsLidar for lidar scattering along with the radar wavelength, radar:
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