The response of the stratosphere to solar variability: What role does the QBO play? (Invited)

Details The response of the stratosphere to solar variability: What role does the QBO play? (Invited) The response of the stratosphere to solar variability: What role does the QBO play? (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa44a..01g&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA44A-01

Physics

[1650] Global Change / Solar Variability, [3305] Atmospheric Processes / Climate Change And Variability

Scientific paper

Irradiance variability associated with the 11-year solar cycle is known to affect the composition and temperature structure in the upper stratosphere and at higher altitudes. Solar cycle responses in the lower stratosphere have been harder to document or explain theoretically because the irradiance at wavelengths that penetrate into this region does not vary strongly with the solar cycle. Nevertheless, many studies over the last two decades have documented statistically significant changes, some of which become evident only when observations are stratified by the phase of the equatorial quasi-biennial oscillation (QBO). We present results of simulations carried out with NCAR's Whole Atmosphere Community Climate Model (WACCM) that show responses in the lower tropical stratosphere and winter extratropical stratosphere that are modulated by the phase of the QBO, and that are consistent in many respects with atmospheric observations. An attempt is made to explore physical mechanisms whereby the QBO affects the response of the lower stratosphere to the 11-year solar cycle.

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