Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa53a..05h&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SA53A-05
Physics
0300 Atmospheric Composition And Structure, 0350 Pressure, Density, And Temperature, 3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Waves And Tides
Scientific paper
In the Numerical Spectral Model, small-scale gravity waves propagating in the north/south direction can generate zonal mean (m = 0) meridional wind oscillations with periods between 2 and 4 months (Mayr et al., JASTP, 2003). These oscillations tend to be confined to low latitudes and have been interpreted to be the meridional counterpart of the wave-driven Quasi Biennial Oscillation in the zonal circulation. Intra-annual scillations with similar periods have been seen in the meridional winds based on UARS data (Huang and Reber, JGR, 2003). Wave driven meridional winds across the equator should generate, due to dynamical heating and cooling, temperature oscillations with opposite phase in the two hemispheres. We have analyzed SABER temperature measurements in the altitude range between 55 and 95 km to investigate the existence of such variations. Because there are also strong tidal signatures (up to about 20ºK) in the data, our algorithm estimates both mean values and tides together. Based on SABER temperature data, the intra-annual variations with periods between 2 and 4 months can have amplitudes up to 5 ºK or more, depending on the altitude. Their amplitudes are in qualitative agreement with those inferred from UARS data (from different years). The SABER and UARS temperature variations reveal pronounced hemispherical asymmetries, which are qualitatively consistent with wave driven meridional wind oscillations across the equator.
Huang Frank T.
Mayr Hans G.
Mlynczak M. M.
Reber Carl A.
Russell Joellen
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