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Dependence of velocity variance on sampling time

✍ Scribed by Gabriele C. Wollenweber; Hans A. Panofsky

Publisher
Springer
Year
1989
Tongue
English
Weight
596 KB
Volume
47
Category
Article
ISSN
0006-8314

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✦ Synopsis

The dependence of the lateral and vertical velocity variances on sampling time have been investigated, based on recent spectral models. The results have been compared with observations at Vandenberg Air Force Base and at the Boulder Atmospheric Observatory.

For sampling times of 1 s to 1 hr, the variation of lateral variances is much smaller in neutral than in unstable conditions. In a stable atmosphere, the variances show a stronger increase with sampling time than predicted by the model. The vertical velocity variances do not increase significantly between 1 and 60min. Again in stable conditions, the measurements show a more pronounced increase of variances as compared to the calculations, indicating significant energy between periods of a few to 20 min. This additional energy may be ascribed to gravity waves.

The models cannot be applied in cases with trends in the data. The model tends to underestimate the dependence of variances on sampling time in cases when systems, such as longitudinal vortices or gravity waves exist.

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