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Convective boundary layer structure observed during Rose-I using the NOAA 915 MHz radar wind profiler
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1991
[PDF-99.26 MB]
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Description:Time series of radar wind profiler and sodar reflectivity data were analyzed to extract a continuous record of mixing depths in the convective planetary boundary layer. Results indicate that radar signal-tonoise ratio (SNR) data can be used to successfully monitor the elevated inversion heights associated with convective development. Mixing depths in the lowest 200 m (i.e., occurring at night) were determined from sodar facsimile records. In addition to the SNR, vertical velocities and Doppler spectral widths measured by the radar were analyzed to further define CPBL structure. Profiles of vertical velocity variance and skewness derived from high temporal resolution radar data agree with previous observations. The radar-derived skewness profile also indicates a peak in skewness just below the height of the capping inversion. Although previously unobserved, this feature occurs frequently in large eddy simulation model results. Estimates of the turbulence kinetic energy dissipation rate determined from radar spectral widths appear to be about a factor of two too low.
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Rights Information:CC0 Public Domain
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