A preliminary study of the instability and development of ultra-long waves / Yeh Tu-Cheng, Wang Hsiao-Ling.
The instability and development of ultra-long waves under frictionless and adiabatic conditions are discussed. The vertical distribution of the static stability and the vertical wind shear of the basic current are found to be factors controlling the instability of ultra-long waves. The occurrence of...
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| Main Authors: | , |
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| Format: | Government Document Book |
| Language: | English |
| Published: |
L.G. Hanscom Field, Bedford, Massachusetts :
Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force,
1969.
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| Series: | AFCRL ;
69-98. Translations (Air Force Cambridge Research Laboratories (U.S.)) ; no. 41. |
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| Summary: | The instability and development of ultra-long waves under frictionless and adiabatic conditions are discussed. The vertical distribution of the static stability and the vertical wind shear of the basic current are found to be factors controlling the instability of ultra-long waves. The occurrence of instability requires that the environmental static stability increases with height and this condition is fulfilled in the atmosphere by virtue of the existence of the stratosphere. The greater the magnitude of the vertical wind shear, the higher is the degree of instability of these waves. Equations relating the vertical wind shear of the basic current to the variation of static stability are derived on the assumption that the disturbances exert a 'feedback' effect on the basic current. This effect is much more pronounced on vertical wind shear than static stability. In addition to the vertical wind shear of the basic current and the vertical distribution of static stability, the wavelength also affects the development of ultra-long waves though this parameter does not affect the maximum amplitude of the mature disturbance. However, the longer the wavelength, the longer it takes for the disturbance to fully develop. The presence of the stratosphere tends to reduce the amplitude of mature disturbances at low levels and enhance those at high levels. |
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| Item Description: | "March 1969." AD0686238 (from http://www.dtic.mil) AFCRL Research Library. Translated from Acta Meteorologica Sinica, volume 35, n. 2, pp. 174-188, May 1965. Translation supported by the Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force (L.G. Hanscom Field, Mass.), and translated by the Oriental Science Research Library of Emmanuel College, Boston, Massachusetts, under Contract F19628-68-C-0251. |
| Physical Description: | vi, 25 pages : illustrations, tables ; 28 cm. |
| Bibliography: | Includes bibliographical references (page 25) |