Vertical wind velocity measurements by a Doppler lidar and comparisons with a Doppler sodar

Details Vertical wind velocity measurements by a Doppler lidar and comparisons with a Doppler sodar Vertical wind velocity measurements by a Doppler lidar and comparisons with a Doppler sodar

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apopt..20.2048c&link_type=abstract

Applied Optics, vol. 20, June 15, 1981, p. 2048-2054. Research supported by the Consiglio Nazionale delle Ricerche and Commissio

Physics

Optics

3

Atmospheric Scattering, Doppler Effect, Optical Radar, Planetary Boundary Layer, Sodar, Vertical Air Currents, Wind Velocity Measurement, Aerosols, Argon Lasers, Backscattering, Interferometers, Pulsed Lasers, Spectrum Analysis

Scientific paper

Doppler lidar measurements of the vertical velocity field in the planetary boundary layer are presented and compared with similar measurements made by a Doppler sodar system. The lidar system is based on a single-frequency Ar(plus) laser emitting a pulsed beam of narrowband radiation vertically through the atmosphere, where it is backscattered from atmospheric aerosols and the backscattered radiation is spectrally analyzed with a spherical Fabry-Perot interferometer along with a sample of the transmitted signal. The internal consistency of the lidar measurements indicates a precision of 0.1 m/sec for scans of 25-sec duration. Comparison of lidar results with those of a monostatic, vertically pointing Doppler sodar device obtained during nights with horizontal winds of less than 1 m/sec and the axes of the two instruments 53 m apart reveal correlation coefficients between the two outputs of approximately 0.5. A comparison of the velocity power spectra provided by the two systems shows good agreement at small frequencies, however, the sodar values are found to be consistently lower at high frequencies due to its limited spatial resolution. It is concluded that Doppler lidar can be used to measure radial wind velocities in small volumes without contamination from orthogonal wind components.

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