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A Theory of Generation of Clear Air Turbulence
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English
Abstract
This paper presents additional information of a theoretical nature and a synoptic case study concerning the nature of the generation of Clear Air Turbulence.
The hypothesis in this paper is that
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(a)
Shear is generated rapidly in a specific region of the atmosphere.
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(b)
The shear reaches a critical value and the flow field becomes turbulent.
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(c)
The turbulent flow field, in the form of a cell or eddy, is carried away from the source region and gradually decays.
The theory on which the prediction of shear is based is developed on a nonlinear basis to show that if convection of vorticity is neglected, the vertical component of the vorticity depends quadratically with time on the solenoids of temperature and divergence of velocity, plus another smaller term. Thus the horizontal shear of the velocity may be expected in certain large scale synoptic situations to grow nonlinearly.
Synoptic analysis has been made by computer program of a well-known case of CAT: April, 1962. Data will be presented comparing theory with observation of CAT.
Authors
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Citation
Moore, R. and Krishnamurti, T., "A Theory of Generation of Clear Air Turbulence," SAE Technical Paper 660176, 1966, https://doi.org/10.4271/660176.Also In
References
- Moore R. L. Krishnamurti T. N. Nature 1966
- Endlich R. M. “The Mesoscale Structure of Some Regions of Clear Air Turbulence,” Journal of Applied Meteorology 3 261 276 1964
- Reiter E. R. Abele N. “Jet Stream Structure and Clear Air Turbulence (CAT),” Journal of Applied Meteorology 3 247 260 1964
- Krishnamurti T. N. “The Subtropical Jet Stream of Winter,” Journal of Meteorology 311 340 1961
- George J. J. “A Different Synoptic Look at Some Cases of Clear Air Turbulence,” Eastern Airlines, Inc. 1965
- Stinson J. R. Cohen S. H. “Use of Isogon-Isovel Chart and the Isogon Deviation Field in Forecasting Atmosphere Turbulence,” Navy Weather Research Facility Norfolk, Va. July 1965
- Moore R. L. Douglas Aircraft Company, Inc.
- Truesdell, C. “The Kinematics of Vorticity,” Indiana University Press Bloomington, Ind. 1954
- Thompson P. D. “Numerical Weather Analysis and Prediction,” The Macmillan Company New York, N. Y. 1 170 1961