Clear Air Turbulence And Its Detection

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Evaluation Of Clear Air Turbulence Detection By Ground Based Radars Special Rawinsondes And Aircraft 1967 1971

Author : Roland J. Boucher
ISBN : UOM:39015095130756
Genre : Aeronautics in meteorology
File Size : 61.75 MB
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During the winter operations, from 1967 to 1971, of Clear Air Turbulence (CAT) research at Wallops Island, Virginia, the Weater Radar Branch of Air Force Cambridge Research Laboratories observed eighteen cases of significant turbulence, defined as cases of light-to-moderate or moderate intensity. The report presents the meteorological data for each of these cases, consisting of synoptic sea level and upper air charts and rawinsonde data, observations of clear air echoes with powerful radars, and aircraft data which are used to indicate the present location and intensity of the turbulence.
Category: Aeronautics in meteorology

Atmospheric Mesostructure And Clear Air Turbulence

Author : Gary J. Thompson
ISBN : UOM:39015095125962
Genre : Atmospheric models
File Size : 73.83 MB
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The mesoscale atmospheric structure in and around regions of clear air turbulence (CAT) is investigated. It is shown that the formation and dissipation of clear air turbulence at several different altitudes is closely related to changes in the atmospheric mesostructure. The turbulence is located in the region of two sloping boroclinic zones and can be attributed to Kelvin-Helmholtz instability resulting from strong wind directional oscillations between these two stable layers. The meteorological sounding data reveal that the lower stable layer and the layer of strong directional oscillations undergo significant upward vertical displacement. The change in turbulence activity can be directly correlated with this motion, and the breakdown of the turbulence and the double stability structure occur almost simultaneously. (Author).
Category: Atmospheric models

National Air Meeting On Clear Air Turbulence

Author : Society of Automotive Engineers
ISBN : WISC:89038661559
Genre : Atmospheric turbulence
File Size : 61.85 MB
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This publication is divided into two sections: detection of clear air turbulence; and operational aspects. Partial contents include: clear air turbulence problems and solutions a state-of-the-art report; the feasibility of optical radar to detect clear air turbulence; early warning of clear air turbulence by photometric measurements; analysis of clear air turbulence incidents and much more.
Category: Atmospheric turbulence

Remote Sensing Of Earth Resources

Author : NASA Scientific and Technical Information Facility
ISBN : UVA:X001009076
Genre : Earth sciences
File Size : 33.31 MB
Format : PDF
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Category: Earth sciences

Aviation Turbulence

Author : Robert Sharman
ISBN : 9783319236308
Genre : Technology & Engineering
File Size : 44.9 MB
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Anyone who has experienced turbulence in flight knows that it is usually not pleasant, and may wonder why this is so difficult to avoid. The book includes papers by various aviation turbulence researchers and provides background into the nature and causes of atmospheric turbulence that affect aircraft motion, and contains surveys of the latest techniques for remote and in situ sensing and forecasting of the turbulence phenomenon. It provides updates on the state-of-the-art research since earlier studies in the 1960s on clear-air turbulence, explains recent new understanding into turbulence generation by thunderstorms, and summarizes future challenges in turbulence prediction and avoidance.
Category: Technology & Engineering

Case Studies Of Clear Air Turbulence Using The Diagnostic Number Tendency Formulation

Author : John L. Keller
ISBN : STANFORD:36105024670205
Genre : Clear air turbulence
File Size : 64.16 MB
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The results of four case studies of clear air turbulence (CAT) using the diagnostic Richardson number tendency (DRT) formulation are highlighted. The performance of this technique in resolving regions of documented CAT encounters is encouraging. Its operational adaptability appears particularly attractive in that input data can be supplied by the currently operational rawinsonde system. Two CAT indices are calculated deterministically, sensing synoptic scale changes in static stability and vertical wind shear conductive for supporting mesoscale CAT layers. These two indices reveal volumes of the troposphere which act as source regions for patches of CAT. The first, the time to reach the critical Richardson number necessary for the initiation of turbulent conditions, was first used by Oard (1974). A second index is devised which is an adaptation of Roach's (1970) work relating synoptic scale and mesoscale energetical coupling and gives more information on the relative intensity of these source regions. The output from the DRT computer module highlights specific regions of the atmosphere which can be interpreted operationally in terms of a CAT encounter probability. (NTRL site)
Category: Clear air turbulence

Proceedings

Author :
ISBN : PSU:000002879949
Genre : Atmospheric turbulence
File Size : 27.55 MB
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Category: Atmospheric turbulence