ACINN Graduate Seminar - SS 2024
2024-06-19 at 16:15 (on-line and on-site)
The REAL and M²HATS
Shane D. Mayor
California State University, Chico, California, USA
The Raman-shifted Eye-safe Aerosol Lidar (REAL) is a ground-based scanning aerosol lidar well-suited for boundary layer and micrometeorological studies. Raman, in the name, refers to stimulated Raman scattering employed in the transmitter to generate energetic laser pulses at a wavelength of 1.54 microns. Because REAL is not a Doppler lidar or a micropulse lidar, it can quickly provide high-resolution aerosol imagery and reveal fine-scale aerosol structures. Moreover, by applying the Typhoon wavelet-based motion estimation algorithm, 2-component horizontal vector flow fields in the atmospheric surface layer can be calculated from the advection of aerosol features. This approach to remote wind measurement is very similar to particle image velocimetry (PIV) which is popular in aeronautical engineering.
The Multipoint Monin-Obukhov Similarity Theory Horizontal Array Turbulence Study (M2HATS) occurred from July to September of 2023 near Tonopah, Nevada. The goal of the experiment was to collect observations to confirm multipoint MOST. In addition to the REAL, we deployed a linear array of 50 sonic anemometers, 2 flux towers, 3 Doppler lidars, 2 micropulse water vapor DIALs, 2 profiling radars, and launched radiosondes twice daily. One goal is to use the vector fields from the REAL and Typhoon to compute 2D velocity spectra in the surface layer. We plan to use the wind measurements from the linear array of sonic anemometers as a truth and develop a transfer function for the filtering effect of the lidar imagery. The analysis of the large data set is just beginning. Any preliminary results will be shared.
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