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Ann. Geophys., 18, 834-843, 2000
www.ann-geophys.net/18/834/2000/
© European Geosciences Union 2000
Gravity wave intensity and momentum fluxes in the mesosphere over Shigaraki, Japan (35°N, 136°E) during 1986-1997
N. M. Gavrilov1, S. Fukao2, and T. Nakamura2
1Atmospheric Physics Department, Saint-Petersburg University, Petrodvorets, 192904, Russia
2Radio Atmospheric Science Center, Kyoto University, Uji, 611-01, Japan
Correspondence to: N.M. Gavilov
Abstract. Averaged seasonal variations of wind
perturbation intensities and vertical flux of horizontal momentum produced by
internal gravity waves (IGWs) with periods 0.2-1 h and 1-6 h are studied at the
altitudes 65-80 km using the MU radar measurement data from the middle and upper
atmosphere during 1986-1997 at Shigaraki, Japan (35° N, 136° E).
IGW intensity has maxima in winter and summer, winter values having substantial
interannual variations. Mean wave momentum flux is directed to the west in
winter and to the east in summer, opposite to the mean wind in the middle
atmosphere. Major IGW momentum fluxes come to the mesosphere over Shigaraki from
the Pacific direction in winter and continental Asia in summer.
Key words: Meteorology and atmospheric dynamics (middle
atmosphere dynamics; waves and tides) · Ionosphere (ionospheric disturbances)
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