Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.a33a0154s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #A33A-0154
Physics
[3319] Atmospheric Processes / General Circulation, [3337] Atmospheric Processes / Global Climate Models, [3362] Atmospheric Processes / Stratosphere/Troposphere Interactions
Scientific paper
An idealized atmospheric dynamical model is used to simulate stratospheric final warming events, by imposing a transition from winter to summer radiative equilibrium temperatures only in the stratosphere. Large numbers of final warming events are simulated, with different strengths of topographical forcing. It is found that the onset dates of final warmings become earlier and the influence of the final warming extends deeper into the troposphere as the topographic amplitude is increased. This is consistent with observations that there is stronger downward influence of the final warming in the Northern Hemisphere than in the Southern Hemisphere. Mechanisms of downward influence are investigated using a zonally symmetric model. Planetary-scale waves are found to be primarily responsible for changes in tropospheric winds (in contrast to the primary role of synoptic-scale waves in mediating stratospheric downward influences on climate timescales). Lower-stratospheric wave driving during the final warming induces a residual circulation that affects the tropospheric circulation. In addition, stratospheric zonal winds affect the propagation of planetary waves in the upper-troposphere, resulting in a burst of planetary wave activity and the deceleration of tropospheric zonal winds.
Chen Gang
Robinson Walter A.
Sun Lantao
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