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Peculiarities of interannual changes in the mean wind and gravity wave characteristics in the mesosphere over Shigaraki, Japan
Author(s) -
Gavrilov N. M.,
Fukao S.,
Nakamura T.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900559
Subject(s) - mesosphere , atmosphere (unit) , zonal and meridional , atmospheric sciences , momentum (technical analysis) , gravity wave , geology , amplitude , climatology , radar , environmental science , meteorology , stratosphere , gravitational wave , physics , telecommunications , finance , quantum mechanics , astrophysics , computer science , economics
Results are presented of month by month measurements of the mean wind and intensity and momentum fluxes of internal gravity waves (IGWs) with the Middle and Upper atmosphere radar (MU radar) at the altitudes 65–80 km at Shigaraki, Japan (35°N, 136°E) in 1986–1997. The mean zonal wind is eastward in winter and westward in summer, but the amplitude of these annual variations is different in different years, having a minimum in 1992–1994. The mean meridional wind shows substantial quasi‐bi‐annual variations. IGW intensities and momentum fluxes had a maximum in 1991–1994. Some possible reasons for such interannual changes are discussed.