Vertical profiles, up to 914 m, of simultaneous measurements of the rate of dissipation of temperature variance (N) and turbulent kinetic energy (E), in certain broad classifications are presented. The statistical distribution of the data, which appears to be closely log-normal is discussed. The pro
Microscale temperature fluctuations in the atmospheric surface layer
β Scribed by G. A. McBean
- Publisher
- Springer
- Year
- 1982
- Tongue
- English
- Weight
- 698 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0006-8314
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β¦ Synopsis
Microscale temperature fluctuations were measured at 2 m above a grassy surface. The temperature-derivative spectrum was in general agreement with earlier results but the bump at nondimensional wavenumbers higher than 0.02 was not as pronounced as has been observed. The Obukhov-Corrsin constant for the one-dimensional temperature spectrum was evaluated to be 0.92 ? 0.05, consistent with recent results. The effects of instability and the vertical variation of temperature variance and kinetic energy dissipation are postulated to explain some of the difference with other spectra.
π SIMILAR VOLUMES
Production, transport and dissipation terms in the temperature variance equation have been measured in the atmospheric surface layer. The transport term is, within the experimental uncertainty, negligible. The dissipation term, determined by assuming local isotropy, is approximately equal to product
Production, transport and dissipation terms in the mean cube temperature equation have been evaluated from measurements in the atmospheric surface layer under moderately unstable conditions. The transpart term, calcuIated by making use of the quasi-Gaussian approximation, is, on average, comparable
## Abstract This paper describes a singleβbeam infrared fluctuation hygrometer, operating in the 2.7 ΞΌm water vapour band. By restricting attention to frequencies making up the atmospheric eddy spectrum, a calibration equation for fluctuations is obtained which is independent of moderately stable i