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Free Content Characterization of short time fluctuations in atmospheric wind speeds by LIDAR measurements

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Wind velocity measurements were taken using a Leosphere Windcube LIDAR system, which operates as a pulsed laser Doppler anemometer. Here we report on first results, which show typical characteristics of atmospheric wind velocities. Especially pronounced intermittent (or heavy-tailed) probability density functions (PDF) of wind speed increments are present on all observed time scales. A transition for large time scales towards a more Gaussian shape is found if only ten minute intervals are selected which share the same mean wind speed. Both typical shapes of PDF are well described and modeled by two previously proposed models.

Messungen von Windgeschwindigkeiten wurden mit einem Leosphere Windcube LIDAR-System durchgeführt, welches nach dem Prinzip eines Laser-Doppler-Anemometers arbeitet. Die ersten Ergebnisse zeigen typische Merkmale atmosphärischer Windgeschwindigkeiten, insbesondere ausgeprägt intermittente Wahrscheinlichkeitsdichtefunktionen (PDF) der Windgeschwindigkeits-Inkremente auf allen beobachteten Zeitskalen. Ein Übergang für große Zeitskalen in Richtung einer Gauß-Verteilung wird beobachtet, wenn nur zehn-Minuten-Intervalle mit gleicher mittlerer Windgeschwindigkeit betrachtet werden. Beide typischen Formen der PDF werden mithilfe zweier zuvor vorgeschlagener Modelle gut beschrieben und modelliert.

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Document Type: Research Article

Publication date: 2009-06-01

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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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