Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41b0711m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA41B-0711
Physics
0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 0342 Middle Atmosphere: Energy Deposition, 3332 Mesospheric Dynamics
Scientific paper
Satellite and ground-based measurements of zonal winds in the tropical upper stratosphere and mesosphere show that the semi-annual oscillation (SAO) in zonal wind is modulated by the phase of the quasi-biennial oscillation (QBO) in lower stratospheric winds. Above 85 km, effects of the diurnal tide hinder satellite-based observations of this feature. Furthermore, most observational records of the mesospheric QBO (MQBO) cover only 2-3 cycles, which may be too short to fully describe the interannual variability. For these reasons, model simulations of the MQBO are useful for quantifying its long-term impact on tracer transport throughout the middle atmosphere. The SAO in mesospheric winds is simulated in a zonally averaged two-dimensional model in which dynamics, radiation, and photochemistry are fully coupled. When an interactive (i.e. not imposed) stratospheric QBO is introduced in a twenty-year simulation, a mesospheric QBO is reproduced in the 60-80 km region that is qualitatively similar to observations, although there are significant quantitative discrepancies. For example, the amplitude of the modeled MQBO ( ~ 10 meters per second) is a factor of two smaller than what is observed. In addition, the altitude of the peak MQBO signal in the model is approximately 10 km lower than observed in ground based radar data. Possible reasons for these discrepancies, and the impact of the modeled MQBO on the transport of constituents throughout the middle atmosphere, will be discussed.
Eckermann Stephen D.
McCormack John P.
Siskind David E.
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