Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa34a..02g&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SA34A-02
Physics
3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Waves And Tides
Scientific paper
A large-scale oscillation with period near 2 days is a ubiquitous feature of the summer mesosphere; it has been detected in ground-based and satellite observations, and reproduced with a variety of numerical models. The current consensus is that the 2-day oscillation is forced through baroclinic instability of the summertime stratospheric jet and takes the form of the gravest Rossby-gravity normal mode of zonal wavenumber k=3. We present SABER observations for 2002-2004 that strongly support this view, and show further that the 2-day wave is part of a set of normal modes excited in the vicinity of the region of strong curvature of the summer jet. Besides the k=3, RG mode, these include the k=4 RG mode (~1.8 days), and Rossby modes at k=2 (2.5-3 days) and k=1 (~5 days). SABER observations also reveal that the wavenumber composition of this 2-day ``complex" is different in southern and northern summer, at least in the data currently available from SABER.
Garcia Rafael
Lieberman Ruth
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