Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.a13i..03n&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #A13I-03
Physics
0342 Middle Atmosphere: Energy Deposition (3334), 1650 Solar Variability (7537), 1739 Solar/Planetary Relationships, 3334 Middle Atmosphere Dynamics (0341, 0342)
Scientific paper
The winter hemisphere stratosphere is a fluid heated by solar ultraviolet radiation at the equator and cooled by outgoing infrared radiation at the pole. Hence, it shares many basic characteristics with classical rotating annulus fluid experiments. It is suggested that much of the non-linear convective dynamics observed in classical rotating annulus fluid experiments has an analogy in the non-linear convective dynamics of the winter hemisphere stratosphere. Particular attention is paid to very strong stratospheric warming events observed during solar sunspot maximum periods (e.g., 1957 and 2002). Such warming events may be triggered in a way analogous to when a rotating annulus's thermal Rossby number exceeds a certain threshold value so as to degenerate into a Hadley like circulation regime. The critical importance of the phase of the equatorial Quasi- Biennial Oscillation upon such events is also discussed.
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