Free Content Spatial averaging-effects on turbulence measured by a continuous-wave coherent lidar

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Abstract:

The influence of spatial volume averaging of a focused continuous-wave coherent Doppler lidar on observed wind turbulence in the atmospheric surface layer is described and analysed. For the first time, comparisons of lidar-measured turbulent spectra with spectra simultaneously obtained from a mast-mounted sonic anemometer at 78 meters height over homogeneous terrain at the test station for large wind turbines at Høvsøre in Western Jutland, Denmark are presented for various backscattering and cloud conditions. Good agreement is found between lidar-measured spectra and spectra predicted by applying a theoretical lidar sampling filter to the three-dimensional turbulence structure.

German
Der Einfluss der räumlichen Mittelung eines kohärenten fokussierenden Dauerstrich-Doppler-Lidars auf Windmessungen in der atmosphärischen bodennahen Schicht wird analysiert und beschrieben. Die unter variablen atmosphärischen Rückstreu- und Wolkenbedingungen durchgeführten Lidarmessungen werden mit Messungen eines an einem Mast in 78 m Höhe über homogenem Terrain montierten Ultraschall-Anemometer verglichen. Gute Übereinstimmung wird zwischen den Messungen gefunden, und die Lidar-Spektren lassen sich gut durch einen Modell-Ansatz, basierend auf der Theorie der räumlichen Mittelung, erklären.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2009/0379

Publication date: June 1, 2009

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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