Internal gravity wave selection in the upper troposphere and lower stratosphere observed by the MU radar: Preliminary results |
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| Authors: | Manabu D Yamanaka Shoichiro Fukao Hiromasa Matsumoto Toru Sato Toshitaka Tsuda Susumu Kato |
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| Institution: | (1) Faculty of Education, Yamaguchi University, 753 Yamaguchi-shi, Yamaguchi, Japan;(2) Radio Atmospheric Science Center, Kyoto University, 611 Uji, Kyoto, Japan;(3) Department of Electrical Engineering, Kyoto University, Yoshida, 606 Kyoto, Japan |
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| Abstract: | Marked wavelike variations of the lower stratospheric wind observed on 7–10 May, 1985 by an MST radar in Japan (by the MU radar) are analyzed assuming that they are induced by monochromatic internal inertio-gravity waves. These variations are mainly composed of two modes (periods: 22 and 24 hours), both of which have zonal phase velocities (C
X
) slower than the mean westerly wind ( ). A statistical analysis of the zonal phase velocity shows thatC
X
 above andC
X
 below the tropopause jet stream, which is considered to be a vivid proof of wave selection due to the tropospheric mean flow and upward wave emission from the tropopause jet. A comparison between the MU radar results and routine meteorological observations leads to the conclusion that the marked waves appear when the jet stream takes a maximum wind speed. |
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| Keywords: | MST radar observation internal gravity waves monochromatic analysis wave-mean flow interaction |
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