Journal ArticleDOI
Using radar to estimate dissipation rates in thin layers of turbulence
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In this paper, a method for estimating the energy dissipation rate, e, from radar measurements of the structure parameter, C2n, in stably stratified layers of turbulence is described.Abstract:
A method is described for estimating the energy dissipation rate, e, from radar measurements of the structure parameter, C2n, in stably stratified layers of turbulence. This estimate applies to horizontal layers of turbulence whose thickness, Lt, is less than the vertical resolution, 2Δ, of the radar (Lt, < 2Δ). Both e within the turbulence layer and the average of e over the radar volume, are determined. The derived expression for e is based on a theoretical relation of turbulence layer thicknesses to the buoyancy length.read more
Citations
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Measurement of turbulent energy dissipation rates in the middle atmosphere by radar techniques: A review
TL;DR: In this article, the effects of turbulence on the width of signal spectra received by these radars are discussed, and it is shown how turbulence intensities may be extracted from spectral width measurements.
Journal ArticleDOI
Turbulent diffusivity in the free atmosphere inferred from MST radar measurements: a review
TL;DR: In this paper, two commonly used methods for estimating the dissipation rates, from the backscattered power and from the Doppler width, are discussed, with some of the uncertainty causes being stressed.
Journal ArticleDOI
The dynamical parameters of turbulence theory as they apply to middle atmosphere studies
TL;DR: In this paper, a short review of the relevant turbulent spectra and equations are considered, and their applications in middle atmosphere studies are outlined, and new developments with regard to some of this theory, and especially new understandings about the dynamical parameters used in some of these applications (often referred to as the constants of the equations) are described.
Journal ArticleDOI
Preliminary estimates of the vertical profiles of inner and outer scales from White Sands Missile Range, New Mexico, VHF radar observations
Frank D. Eaton,G. D. Nastrom +1 more
TL;DR: In this article, seasonal profiles from 5 to 20 km above mean sea level of the inner scale have been estimated based on the kinematic viscosity and eddy dissipation rates which were determined from 5 years of nearly continuous 49.25MHz radar observations at White Sands Missile Range, New Mexico.
Journal ArticleDOI
MST radar studies of wind and turbulence in the middle atmosphere
K.S. Gage,Ben B. Balsley +1 more
TL;DR: A survey of recent developments in the observation of wind and turbulence in the stratosphere and mesosphere using MST radars is presented in this paper, where the authors highlight the growing recognition that the MST/ST radar is a valuable tool for routine monitoring of the atmospheric wind field.
References
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Journal ArticleDOI
On the Spectrum of Isotropic Temperature Fluctuations in an Isotropic Turbulence
TL;DR: In this paper, the one-dimensional and three-dimensional spectral equations for a field of isotropic temperature fluctuations in a turbulent environment are derived from the correlation equation. And the relative effective cut-off wave numbers of the two spectra are compared in terms of the fluid Prandtl number.
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The Spectrum of Nearly Inertial Turbulence in a Stably Stratified Fluid.
TL;DR: In this paper, the assumption leading to the classical inertial subrange spectral forms is critically examined, and it is shown how, by slightly relaxing the assumptions, a form can be obtained for the spectrum in the presence of other energy sinks.
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Vertical profiles of refractivity turbulence structure constant: Comparison of observations by the Sunset Radar with a new theoretical model
TL;DR: In this article, the vertical profiles of refractivity turbulence structure constant C2n (which is proportional to the radar volume reflectivity) from about 5 to 15 km are measured by the Sunset Radar every 50 seconds.
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Atmospheric Structure and Radar Backscattering in Clear Air
TL;DR: In this paper, the authors summarized advances in radar backscattering from refractive index irregularities in the clear air and its relationship to atmospheric structure and turbulence, and concluded that strong CAT will be associated with zones of increased radar reflectivity and enhanced radar returns.
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Stratospheric Mixing Estimated from High-Altitude Turbulence Measurements
TL;DR: In this article, the vertical diffusion coefficients in the stratosphere were estimated from data obtained in the High Altitude Clear Air Turbulence (HICAT) investigation, and the square roots of the integrals of these spectra for wavelengths <610 m, designated vi (for the ith component of velocity), were computed and related to the dissipation of kinetic energy.