Sample Measurements from Metek Doppler SODAR

Sample Measurements from Metek Doppler SODAR

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Samples of Mobile Phase Doppler SODAR and RASS Measured at Marseille (ESCOMPTE 2001)

General
In order to demonstrate features and performance of the small DSDPA90.24 and the 1290 MHz RASS extension Metek installed such system to take part within the French experiment ESCOMPTE near Marseille. The site was often influenced by a well developed land/sea breeze and katabatic wind flow effects.

Data Retrieval
Simultaneously instantaneous and averaged data were calculated by the SODAR. In addition to the mean spectra derived data an off-line cluster algorithm was applied on the instantaneous data for wind speed and wind direction derivation.

Main SODAR Operation Parameters

Ave = 900 Averaging Interval 900 s

Trans = 2000 Acoustic Frequency 200 Hz

Step = 25 Height Steps 25 m

Hmin = 37.5 Start of Sampling 37.5 m, first height is 50 m

Hmax = 500 End of Sampling 500 m, last height is 500 m

Shown Samples

A one week period of wind vectors and potential temperatures (corrected by 0.98 /100 m) are shown in the following plots. Wind speed and wind direction are derived from instantaneous data and temperature is derived from mean spectra in order to show that both analyzing techniques are available simultaneously. On both data a small averaging procedure (SF1) was applied to smooth measuring variables during convective conditions.

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