Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa12a..08l&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA12A-08
Physics
3332 Mesospheric Dynamics, 3369 Thermospheric Dynamics (0358), 3379 Turbulence (4490), 3384 Acoustic-Gravity Waves
Scientific paper
The temperature of the terrestrial atmosphere increases rapidly with altitudes above the mesopause. As a result, the atmospheric static stability peaks at the turbopause (100-110 km) at most latitudes and seasons, except at high latitudes in the summer hemisphere. With the large static stability, the wind shear could reach very large values before the atmosphere becomes dynamically unstable. The value and the height range of this attainable large wind shear are consistent with the large wind shear often derived from chemical release wind measurements (low and mid-latitudes) and sodium lidar measurements (summer high latitudes). Moreover, the vertical variation of the large attainable wind shear obtained from the vertical profiles of the Brunt-Väisälä frequency at low and mid-latitudes are also in general agreement with that from the chemical release experiments. The increase of the Brunt-Väisälä frequency also means the decrease of the vertical wavelength of gravity waves in this region. This in turn suggests the likelihood of large perturbative shear, dynamic instability, and interaction between the wave the mean flow. Possible link between the wave-mean flow interaction and the fast meridional transport deduced from observations of water plumes from space shuttle exhaust will also be discussed.
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