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A Study Of Gravity Wave Variability Saturation And Turbulence Generation In The Mesosphere And Lower Thermosphere
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Book Synopsis A Study of Gravity Wave Variability, Saturation, and Turbulence Generation in the Mesosphere and Lower Thermosphere by : David C. Fritts
Download or read book A Study of Gravity Wave Variability, Saturation, and Turbulence Generation in the Mesosphere and Lower Thermosphere written by David C. Fritts and published by . This book was released on 1989 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our principal research objectives were to understand the characteristics of and the processes controlling the fluctuations of velocity, density, and optical properties due to wave and turbulence motions in the middle atmosphere. It was hoped that an increased understanding of these motions and their variability would lead to a better predictive capability for their influence on in situ and ground-based systems using this region in the future. Research progress was made on several fronts. Theoretical efforts focussed on wave propagation and saturation processes, the effects of varying stratification on wave saturation and wave transports of energy and momentum, and the influences of chemical recombination on ion and neutral fluctuations due to waves and turbulence. (edc).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evidence of Gravity Wave Saturation and Local Turbulence Production in the Summer Mesosphere and Lower Thermosphere During the STATE (Structure and Atmospheric Turbulence Environment) Experiment by :
Download or read book Evidence of Gravity Wave Saturation and Local Turbulence Production in the Summer Mesosphere and Lower Thermosphere During the STATE (Structure and Atmospheric Turbulence Environment) Experiment written by and published by . This book was released on 1988 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study used the unique data set obtained during the Structure and Atmospheric Turbulence Environment (STATE) experiment, conducted during June 1983 at Poker Flat, Alaska, to examine the structure and characteristics of the wave field near the summer mesopause. It is shown that the rocket and radar data together permit a much more detailed specification of wave parameters than would be possible using either data set alone. Results of this analysis suggest that the wave field near the summer mesopause is composed, in general, of a superposition of wave motions which act collectively to produce regions in which the wave field is convectively or dynamically unstable. These regions are found to correlate well with zones of enhanced turbulence and small-scale wave activity, suggesting the processes and effects of wave field saturation. Keywords: Gravity waves; Instability; Mesosphere; Thermosphere. Reprints.
Book Synopsis The Upper Mesosphere and Lower Thermosphere by : R. M. Johnson
Download or read book The Upper Mesosphere and Lower Thermosphere written by R. M. Johnson and published by American Geophysical Union. This book was released on 1995-01-09 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 87. This volume provides a review of progress made in recent years in experimental and theoretical investigation of the upper mesosphere and lower thermosphere and coupling between these regions and the ionosphere. Detailed study of the mesosphere/lower thermosphere/ionosphere (MLTI) region has historically been difficult because of its relative inaccessibility to direct measurement techniques and the complex and highly coupled processes which occur there. Although we have still not successfully unraveled all these complex interactions, we have made significant recent progress toward a fuller understanding of the basic state of the MLTI and of the dominant wave and coupling processes. This monograph includes a set of tutorial papers, which review our current understanding of aspects of the MLTI. These tutorials are interspersed with a selection of papers describing research progress on various topics of current interest in this region. The book should therefore be useful both to the newcomer, as an introduction to this field of research, and to the more experienced researcher, providing an overview of research in progress as well as a convenient reference collection of papers describing our current understanding.
Download or read book Middle Atmosphere written by PLUMB and published by Birkhäuser. This book was released on 2013-11-21 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: PAGEOPH, stratosphere, these differences provide us with new evidence, interpretation of which can materially help to advance our understanding of stratospheric dynamics in general. It is now weil established that smaller-scale motions-in particular gravity waves and turbulence-are of fundamental importance in the general circulation of the mesosphere; they seem to be similarly, if less spectacularly, significant in the troposphere, and probably also in the stratosphere. Our understanding of these motions, their effects on the mean circulation and their mutual interactions is progressing rapidly, as is weil illustrated by the papers in this issue; there are reports of observational studies, especially with new instruments such as the Japanese MV radar, reviews of the state of theory, a laboratory study and an analysis of gravity waves and their effects in the high resolution "SKYHI" general circulation model. There are good reasons to suspect that gravity waves may be of crucial significance in making the stratospheric circulation the way it is (modeling experience being one suggestive piece of evidence for this). Direct observational proof has thus far been prevented by the difficulty of making observations of such scales of motion in this region; in one study reported here, falling sphere observations are used to obtain information on the structure and intensity of waves in the upper stratosphere.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Papers on Laser Beam Diagnostics by : Robert N. Hindy
Download or read book Selected Papers on Laser Beam Diagnostics written by Robert N. Hindy and published by SPIE-International Society for Optical Engineering. This book was released on 1996 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers in this volume cover topics including: laser measurements of long distances; surface flaw detection using oblique angle illumination; optical diagnostics of laser-metal interaction during welding; high-speed surface flaw detection; and sulphur chemistry in flames.
Book Synopsis Gravity Wave Processes by : Kevin Hamilton
Download or read book Gravity Wave Processes written by Kevin Hamilton and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of this volume is the observation and modelling of the gravity wave field in the atmosphere. The focus is on the question of how to include the effects of small-scale gravity waves in sophisticated global climate models. The book comprises 26 chapters, including contributions from distinguished experts in observation and theory, along with results from studies of gravity wave parameterization within comprehensive climate models.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1990-08 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Observational Investigation on Gravity Wave Characteristics and Propagation in the Lower Stratosphere and Mesopause by : Zhenhua Li
Download or read book An Observational Investigation on Gravity Wave Characteristics and Propagation in the Lower Stratosphere and Mesopause written by Zhenhua Li and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, investigations on gravity waves are conducted in two regions of the middle atmosphere: the lower stratosphere using high-resolution radiosonde at South Pole and the mesopause region using OH airglow imager at Maui, Hawaii and Cerro Pachon, Chile. Wave characteristics at these regions are deduced and the seasonal variation of wave activity, wave sources, and propagation effect are studied. The study of gravity waves in the lower stratosphere at South Pole reveals that sources other than topography are important even for the lower part of middle atmosphere. Horizontal propagation must be included in parameterization schemes to reflect the fact that waves derived from radiosondes have slant propagation paths. They travel long distance horizontally before they reach higher altitudes. Long term gravity wave characteristics over Maui from 2002 to 2007 are deduced from OH airglow imager. Wave parameters from the long term imager observation provide robust statistics of high-frequency gravity wave in the midlatitudes. Poleward wave propagation preference during summer and equatorward wave propagation preference during winter are observed over Maui. They are also opposite to the seasonal mean meridional wind direction which are always pointing toward winter pole. Momentum fluxes deduced from OH imager are also highly anti-correlated with background winds. At least for the part of spectrum observed by airglow imager, gravity waves act as damping mechanism for diurnal tide. Gravity wave occurrence frequency does not follow the variation of local convective sources and convective sources in a large domain when ducted waves are considered. In fact, with a constant wave source and monthly mean background atmospheric condition, the simulated wave transmission resembles the wave occurrence frequency observed by OH airglow imager at Maui. Thus, at Maui the propagation effect dominates the seasonal variation in wave activity. Gravity wave momentum fluxes deduced from airglow imager provide important observation constraint for gravity wave parameterization for the mesopause region. To explain the cause of seasonal change on meridional propagation preference, three mechanisms are investigated: critical-layer filtering, wave ducting, and Doppler-shifting by local mean wind. Critical-layer filtering failed to explain the propagation preference. Observed gravity wave propagation directions are largely related to the background wind in the airglow layer. This is caused by Doppler-shifting of gravity waves by background wind. Background wind Doppler shifts gravity waves propagating against (along) background wind to higher (lower) frequency and larger (smaller) vertical wavelength. Thus, the observed gravity waves tend to propagate against background wind. The apparent against background wind propagation is largely caused by the contrast in cancellation factor for waves propagate in different direction. To a lesser degree, the difference in dissipation for waves propagate in different direction also contributes to the observed against background wind propagation. The results from this work show gravity wave's propagation in middle atmosphere is strongly affected by atmospheric field. For low frequency waves, their propagation paths are slant and can travel hundreds of kilometers before they reach the middle atmosphere. For high frequency gravity waves, though their propagation paths are mostly vertical, they are subject to ducting and reflection. Due to the large contribution of momentum flux in the Mesosphere and Lower Thermosphere (MLT) by high-frequency, short-horizontal-scale waves, these propagation effects must be included in gravity wave parameterizations.
Book Synopsis A Numerical Study of Two Dimensional Gravity Wave Breaking by : Hanli Liu
Download or read book A Numerical Study of Two Dimensional Gravity Wave Breaking written by Hanli Liu and published by . This book was released on 1996 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Introduction to Atmospheric Gravity Waves by : C. J. Nappo
Download or read book An Introduction to Atmospheric Gravity Waves written by C. J. Nappo and published by Academic Press. This book was released on 2002-08-26 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: CD-ROM contains: 10 computer programs written in FORTRAN77, and 6 ASCII data sets.
Book Synopsis Meteorological and Geoastrophysical Abstracts by :
Download or read book Meteorological and Geoastrophysical Abstracts written by and published by . This book was released on 1996 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annales Geophysicae written by and published by . This book was released on 2009 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of Gravity Wave Saturation Processes in the Lower Stratosphere and Mesosphere by : Hua-Guo Chou
Download or read book An Investigation of Gravity Wave Saturation Processes in the Lower Stratosphere and Mesosphere written by Hua-Guo Chou and published by . This book was released on 1987 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
