The Effect of Decadal Solar UV Variability on the Middle Atmosphere: A 2-D Modeling Perspective
John McCormack [mccormack@nrl.navy.mil], Naval Research Laboratory, Washington DC

One of the fundamental problems in solar-climate studies is to identify the relevant physical mechanisms capable of translating the effects of solar variability at higher altitudes downward to the earth's surface. This presentation will review the effects of the 11-year cycle in solar UV irradiance on middle atmospheric photochemistry, radiation, and dynamics from both an observational and modeling perspective. Recent zonally averaged (2D) model calculations suggest that one possible mechanism involves solar cycle modulation in the strength of the quasi-biennial oscillation (QBO) in equatorial stratospheric winds. The implications of this result for sun-climate studies will be discussed.