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Davies, F; Collier, CG; Bozier, KE; Pearson, GN
Publisher: Royal Meteorological Society
Languages: English
Types: Article
Subjects: other, QC851999, TK5101, QA76, QC350467
A single pulsed Doppler lidar was successfully deployed to measure air flow and turbulence over the Malvern hills, Worcester, UK. The DERA Malvern lidar used was a CO2 µm pulsed Doppler lidar. The lidar pulse repetition rate was 120 Hz and had a pulse duration of 0.6 µs The system was set up to have 41 range gates with range resolution of 112 m. This gave a theoretical maximum range of approximately 4.6 km. The lidar site was 2 km east of the Malvern hill ridge which runs in a north-south direction and is approximately 6 km long. The maximum height of the ridge is 430 m. Two elevation scans (Range-Height Indicators) were carried out parallel and perpendicular to the mean surface flow. Since the surface wind was primarily westerly the scans were carried out perpendicular and parallel to the ridge of the Malvern hills.\ud The data were analysed and horizontal winds, vertical winds and turbulent fluxes were calculated for profiles throughout the boundary layer. As an aid to evaluating the errors associated with the derivation of velocity and turbulence profiles, data from a simple idealized profile was also analysed using the same method. The error analysis shows that wind velocity profiles can be derived to an accuracy of 0.24 m s-1 in the horizontal and 0.3 m s-1 in the vertical up to a height of 2500 m. The potential for lidars to make turbulence measurements, over a wide area, through the whole depth of the planetary boundary layer and over durations from seconds to hours is discussed.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

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    • Estimations of atmospheric boundary layer uxes and other turbulence parameters from Doppler lidar data. J. Geophys. Res., 97, 18409-18423
    • Convection waves: Observations of gravity wave systems over convectively active boundary layers. Q. J. R. Meteorol. Soc., 113, 445-467
    • Remote determination of winds, turbulence spectra and energy dissipation rates in the boundary layer from lidar measurements. J. Atmos. Sci., 37, 978-985
    • A compact pulsed coherent CO2 laser radar for boundary-layer meteorology. Q. J. R. Meteorol. Soc., 125, 2703-2721
    • A case-study of a partially cloudy boundary layer. Q. J. R. Meteorol. Soc., 126, 393-413
    • 'Doppler radar studies of boundary layer wind pro le and turbulence in snow conditions' . Pp. 191-196 in Proceedings of the 14th radar meteorology conference, Tucson, USA. American Meteorological Society, Boston, USA
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  • Discovered through pilot similarity algorithms. Send us your feedback.

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