Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43a1561m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA43A-1561
Physics
1650 Solar Variability (7537), 3334 Middle Atmosphere Dynamics (0341, 0342), 3367 Theoretical Modeling, 3384 Acoustic-Gravity Waves, 3389 Tides And Planetary Waves
Scientific paper
We present results from the Numerical Spectral Model (NSM), which focus on the temperature environment of the mesopause region where Polar Mesospheric Clouds (PMC) form. The dynamical interactions originate from the stratospheric Quasi-biennial Oscillation (QBO) of the zonal circulation, which is generated in the NSM primarily by parameterized small-scale gravity waves (GW) and by planetary waves owing to the baroclinic instability. In contrast to the zonal winds that are confined to low latitudes, the associated temperature variations extend to high latitudes and in particular at higher altitudes. The meridional circulation redistributes the energy, and one can show that the associated vertical winds produce through adiabatic heating and cooling inter-annual year-to-year temperature variations from 5 to 10 K in the polar mesopause region. Our analysis also demonstrates that the non-linear interaction between the QBO and the dominant annual cycle produces significant inter-hemispheric differences. Salby and Callaghan (J. Clim. 2000) analyzed 41 years of radiosonde measurements at 20 km and found in the QBO zonal winds a relatively large (~ 8 m/s) solar cycle (SC) modulation. This observation was reproduced in a study with the NSM where the amplitude of the imposed SC varies with height exponentially from 0.2% at the ground to 20% at 100 km and above (Mayr et al., GRL, 2006). That model also generates QBO (inter-annual) temperature variations in the polar mesopause region but with a measurable SC modulation. Over the 10-year period of the imposed SC forcing, the QBO temperature amplitude varies on average by more than 1 K in the polar region, depending on the hemisphere. And the phase of the QBO temperature modulation, relative to the SC peak, can vary by up to 3 years.
Huang Frank T.
Mayr Hans G.
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