Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41b0719g&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA41B-0719
Physics
2439 Ionospheric Irregularities, 3334 Middle Atmosphere Dynamics (0341, 0342), 3337 Numerical Modeling And Data Assimilation, 3384 Waves And Tides
Scientific paper
Simple numerical filters are applied to extract wind variances with time scales 0.1 - 1 hr and 1 - 5 hr from the observations with medium frequency (MF) radar at altitudes 70 - 90 km over Hawaii (22 N, 159 W) during the years 1990 - 2000. Seasonal and interannual variations of the wind variances (which could be attributed to intensity of atmospheric internal gravity waves - IGWs) are examined. The mean zonal wind has annual cycle below 83 - 86 km and semiannual cycle above. Seasonal variations of the intensity of IGWs with periods 0.1 - 1 hr and 1 - 5 hr show two maxima (in winter and summer) below altitude 80 km. Above the maxima of IGW intensity are shifted to the equinoxes. Interannual changes of the seasonal variations of IGW intensity are larger at the altitudes below 75 km (with larger winter maxima between years 1994 - 1997) and above 85 km where the changes may be different for longer- and shorter-period IGWs. Evidences are obtained for quasi-two-biannual and longer-period interannual variations of IGW intensity. Numerical modeling shows that the observed altitude changes in the seasonal variations of wind variances may be explained by a superposition of IGWs generated at different levels in the troposphere and middle atmosphere and by influence of the profiles of background wind and temperature on IGW propagation.
Fritts David C.
Gavrilov Nikolai M.
Riggin Dennis M.
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