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Internal inertia-gravity waves in the tropical lower stratosphere observed by the Arecibo radarA quasi-periodic wind oscillation with an apparent 20-50 hour period was observed at between 16 and 20 km in every experiment conducted during three periods from 1979 to 1981 with the Arecibo UHF radar. The wave disappeared near 20 km, where the mean zonal flow had easterly shear with height. This phenomenon is discussed in terms of wave absorption at a critical level, and it is suggested that the wave had a westward horizontal phase speed of 10-20 m/sec. On the basis of a relationship from f-plane theory in which the Doppler-shifted wave frequency approaches the Coriolis frequency at the critical level, an intrinsic period and horizontal wavelength at the wave-generated height of 20-30 hours and about 2000 km, respectively, are inferred.
Document ID
19850032548
Document Type
Reprint (Version printed in journal)
Authors
Maekawa, Y. (Instituto Geofisico del Peru Lima, Peru)
Kato, S. (Kyoto University Uji, Japan)
Fukao, S. (Kyoto University Kyoto, Japan)
Sato, T. (Shigaraki MU Observatory Shigaraki, Shiga, Japan)
Woodman, R. F. (Instituto Geofisico del Peru Lima, Peru)
Date Acquired
August 12, 2013
Publication Date
August 1, 1984
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 41
ISSN: 0022-4928
Subject Category
METEOROLOGY AND CLIMATOLOGY
Funding Number(s)
CONTRACT_GRANT: NASA ORDER W-14569
Distribution Limits
Public
Copyright
Other