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Thursday, May 7, 2020 | History

2 edition of model of gravity-wave-induced variability and turbulence in the stratified free atmosphere found in the catalog.

model of gravity-wave-induced variability and turbulence in the stratified free atmosphere

C. W Fairall

model of gravity-wave-induced variability and turbulence in the stratified free atmosphere

by C. W Fairall

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  • 32 Currently reading

Published by U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Wave Propagation Laboratory, For sale by the National Technical Information Service in Boulder, Colo, Springfield, Va .
Written in English

    Subjects:
  • Gravity waves -- Mathematical models,
  • Atmospheric turbulence -- Mathematical models

  • Edition Notes

    Other titlesModel of gravity wave induced variability and turbulence in the stratified free atmosphere
    StatementC.W. Fairall
    SeriesNOAA technical memorandum ERL WPL -- 179, NOAA technical memorandum ERL WPL -- 179
    ContributionsWave Propagation Laboratory
    The Physical Object
    Paginationiii, 65 p. :
    Number of Pages65
    ID Numbers
    Open LibraryOL17929697M

    Numerical simulation of the dynamics of homogeneous turbulence of a stably stratified fluid in the presence of a vertical constant-density gradient was carried by: The TLS turbulence packages were designed to collect high-quality, finescale in situ measurements of temperature, velocity (along-stream component), and small-scale turbulence (C 2 T and ε).The system consists of a lifting platform (a parafoil kite or an aerodynamic blimp, depending on the wind conditions) that can loft a vertical array of lightweight by:

    Gravity waves exist in all types of geophysical fluids, such as lakes, oceans, and atmospheres. They play an important role in redistributing energy at disturbances, such as mountains or seamounts and they are routinely studied in meteorology and oceanography, particularly simulation models, atmospheric weather models, turbulence, air pollution, and climate research.5/5(2).   [1] We proposed a broad spectral data‐analyzing method to study the altitude and seasonal variability of gravity wave (GW)‐associated dynamics in the lower atmosphere at a midlatitude by using the radiosonde data from Miramar Nas (°N, °W), California, during – Generally, the presented primary statistical features of GW parameters and their seasonal variation Cited by:

      Growth and decay of turbulence in a stably stratified shear flow - Volume - J. J. Rohr, E. C. Itsweire, K. N. Helland, C. W. Van AttaCited by: Cognitive chaos: Why turbulence sustains in supercritically stratified free atmosphere? (Extended abstract EMS) Sergej S. Zilitinkevich 1Finnish Meteorological Institute, Helsinki, Finland 2Division of Atmospheric Sciences, University of Helsinki, Finland 3Department of Radio Physics, University of Nizhniy Novgorod, Russia 4Faculty of Geography, Moscow University, Russia.


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Model of gravity-wave-induced variability and turbulence in the stratified free atmosphere by C. W Fairall Download PDF EPUB FB2

A model of gravity-wave-induced variability and turbulence in the stratified free atmosphere. Assuming regions with Ri turbulent, we can examine a number of aspects of the occurrence of clear-air turbulent breakdown in the stratified free atmosphere. For a typical tropospheric condition, the average turbulent layer thickness turns out to be about 35 m and about 20% of the troposphere appears to be actively by: The momentum transport by gravity waves is of great importance to the atmospheric circulation, structure and variability, especially in the middle atmosphere.

Gravity waves are also closely related to various severe weather phenomena, such as downslope windstorms, orographic precipitation and clear-air turbulence. At high wavenumbers the model exhibits a wavenumber to the -3 dependence, which is characteristic of a continuum of internal gravity waves whose amplitudes are controlled by a breaking process.

By employing a random phase between wavenumber amplitude components. Turbulence and gravity waves in the vicinity of a midtropospheric warm front: A case study using VHF echo-intensity measurements and radiosonde dataAuthor: Andreas Muschinski.

Even more importantly, this turbulence structure in the free atmosphere resembles the turbulence structure in the stably stratified upper ocean remarkably well (e.g., Woods ). Kelvin–Helmholtz shear instabilities have been observed in both the inversion at the top of the ABL and the thermocline immediately below the by: Turbulence in the Stratified Atmosphere (10)31 As the vertical velocity spectra were also weaker than predicted by an isotropic theory, they suggested that anisotropy of the B.S.R.

could account for these by: Influences of Gravity Waves on Convectively Induced Turbulence (CIT): A Review The variability of turbulence values with respect to model resolution and distance away from convection is also.

Some examples of such turbulence layers and the concur- rent gravity wave oscillations, observed in the low latitude mesosphere over the Arecibo Observatory/Puerto Rico are discussed. This turbulence structures which are intermittent on short time scales but Cited by: 9. Planet.

Space Sei.Vol. 21, pp. 6 to Pcraamon Pres Printed in Northern Ireland TURBULENCE, BILLOWS AND GRAVITY WAVES IN A HIGH SHEAR REGION OF THE UPPER ATMOSPHERE K. LLOYD and C. LOW Weapons Research Establishment, Salisbury, South Australia, Australia and R. VINCENT University of Adelaide, South Australia, Australia (Received in Cited by: The author focuses first on the fundamentals and then progresses to such topics as the atmospheric boundary layer, turbulence in the upper atmosphere, turbulence in the core of the earth, zonal winds in the giant planets, turbulence within the interior of the sun, the Cited by: Variability of flow regimes and turbulence scalings in a model of an inhomogeneously stratified, tropopause jet is investigated through high-resolution, forced, three-dimensional numerical.

The RUC model S CATCAT domain is shown in Fig. 2 along with a 1-h forecast of winds at hPa valid at UTC 18 February. An intense 92 m s −1 jet maximum is apparent in the vicinity of the G-IV track, and an impressively strong cyclonic shear exists to its northeast.

As this northwesterly jet streak approached the base of a sharp upper-level trough, noticeable diffluence developed in Cited by: Purchase An Introduction to Atmospheric Gravity Waves, Volume - 2nd Edition.

Print Book & E-Book. ISBN  Such turbulence is commonly referred to as convectively induced turbulence or CIT, and can be hazardous to aviation.

Although this turbulence can occur both within and outside the convection, out-of-cloud CIT is particularly hazardous, since it occurs in clear air and cannot be seen by eye or onboard by: 2. To investigate the dynamics of gravity waves in stratified Boussinesq flows, a model is derived that consists of all three-gravity-wave-mode interactions (the GGG model), excluding interactions involving the vortical mode.

The GGG model is a natural extension of weak turbulence theory that accounts for exact three-gravity-wave by: 8. Turbulence and Mixing in the Free Atmosphere Inferred from High-Resolution Soundings CAROL ANNE CLAYSON1 and LAKSHMI KANTHA2 1. Department of Meteorology and Geophysical Fluid Dynamics Institute.

The premise and predictive power of the methodology relies on the reduction of the flow organization and structure at small scales. For instance, the resolved-scale dynamics capture the complex cloud shapes whereas the turbulence model represents the effects of stratified turbulence in a small volume (1 3 – 50 3 m 3) of the by: 3.

near shear-free turbulence (St turbulence (St > 5). The normalized buoyancy flux attains maximum values of for near shear-free turbulence at Nt 1 and attenuates to small even negative values (counter gradient flux) for larger values of Nt. The evolution of buoyancy flux differs with increasing values of by: 4.

An essentially new turbulence closure scheme for neutral and stably stratified atmospheric boundary layers is presented. The scheme is based on the prognostic turbulent energy equation, which is the sum of the turbulent kinetic and turbulent potential by:.

Sensitivity of stratified turbulence to the buoyancy Reynolds number. In this article we present direct numerical simulations of stratified flow at resolutions of up to ${8}^{2} \times $, to explore scalings for the dynamics of stably stratified by: The reach and impact of atmospheric gravity waves and gravity-wave-induced phenomena span a range of spatial scales, from mesoscale to global scale and affect both the weather and climate.

While in the lower atmosphere their impacts usually remain regional, in the upper atmosphere they can dominate atmospheric processes on a much larger scale.2. Turbulence in a stably stratified-free atmosphere. Turbulence is a gas flow where there is a system of vortices of different sizes, which are creating chaotic variations of gas parameters in space and time (Monin and Yaglom,).

As a result, coefficients of mass, momentum and energy transfer are many orders higher than molecular Cited by: