Gravity wave intensity and momentum fluxes in the mesosphere over Shigaraki, Japan (35°N, 136°E) during 1986-1997

Annales Geophysicae

N. M.Gavrilov¹  T.Nakamura¹  S.Fukao¹ 

DOI  :  10.1007/s00585-000-0834-z

学科分类：地球科学(综合)

来源: Copernicus Publications

【 摘 要 】

Averaged seasonal variations of windperturbation intensities and vertical flux of horizontal momentum produced byinternal gravity waves (IGWs) with periods 0.2-1 h and 1-6 h are studied at thealtitudes 65-80 km using the MU radar measurement data from the middle and upperatmosphere during 1986-1997 at Shigaraki, Japan (35^° N, 136^° E).IGW intensity has maxima in winter and summer, winter values having substantialinterannual variations. Mean wave momentum flux is directed to the west inwinter and to the east in summer, opposite to the mean wind in the middleatmosphere. Major IGW momentum fluxes come to the mesosphere over Shigaraki fromthe Pacific direction in winter and continental Asia in summer.

Key words: Meteorology and atmospheric dynamics (middleatmosphere dynamics; waves and tides) · Ionosphere (ionospheric disturbances)

【 授权许可】

Unknown