Temporal Scales of Convective Coherent Structures Derived from Sodar Data |
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| Authors: | I V Petenko V A Bezverkhnii |
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| Institution: | (1) Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow, Russia, RU |
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| Abstract: | Summary The temporal variability of thermal turbulence and vertical velocity derived from sodar measurements during periods of atmospheric
free convection is studied using both spectral and wavelet analysis. A promising approach to analyse atmospheric processes,
an advanced high-resolution spectrum estimation technique is described. Variance spectra of meteorological and turbulent parameters
are shown to have their specific comb shape at a low-frequency range. Spectra and wavelet transforms of the data obtained
at different sites both indicate the existence of some representative predominant temporal scales in time variations of the
convective boundary layer structure. The most evident temporal scales revealed are centered around 7–9 and 18–22 minutes.
Received October 16, 1998 Revised April 15, 1999 |
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