Variances and spectra of vertical velocity just above the surface layer |
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| Authors: | H. A. Panofsky C. Mazzola |
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| Affiliation: | (1) Dept. of Meteorology, College of Earth and Mineral Sciences, Pennsylvania State University, University Park, Pa., USA |
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| Abstract: | Variances and spectra of vertical velocity at 75 m and 225 m obtained by aircraft have been analyzed. Given effective roughness lengths for the different terrain types, nomograms for the standard deviations were constructed as functions of wind speed and lapse rate, guided by theoretical considerations.Normalized spectra agree well with analogous spectra obtained elsewhere, and with requirements of similarity theory; however, over mountainous terrain, low-frequency spectra peaks appear, the frequency of which appears to be independent of height. |
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