HR: 0800h
AN: GC31B-0341    [Abstracts]
TI: Influence of the solar cycle on the Quasi-Biennial Oscillation period
AU: * Kuai, L
EM: kl@gps.caltech.edu
AF: California Institute of Technology, Caltech, Planetary Science, Mail Code:150-21 1200 E. California Ave., Pasadena, CA 91125, United States
AU: Shia, R
EM: rls@gps.caltech.edu
AF: California Institute of Technology, Caltech, Planetary Science, Mail Code:150-21 1200 E. California Ave., Pasadena, CA 91125, United States
AU: Jiang, X
EM: Xun.Jiang@jpl.nasa.gov
AF: Jet Propulsion Laboratory, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Tung, K
EM: tung@amath.washington.edu
AF: University of Washington, Department of Applied Mathematics, Seattle, WA 98195, United States
AU: Yung, Y L
EM: yly@gps.caltech.edu
AF: California Institute of Technology, Caltech, Planetary Science, Mail Code:150-21 1200 E. California Ave., Pasadena, CA 91125, United States
AB: From the 1960s to the early 90s, the westerly phase of the Quasi-Biennial Oscillation (QBO) was observed to have a longer period during the solar minima [Salby and Callaghan, 2000]. During the same period, the stratosphere was contaminated by volcanic aerosols. For the two solar cycles before and after this interval, the QBO period exhibited the opposite behavior. To determine the true dependence of the QBO period on the solar cycle in the absence of volcanic aerosols, we performed an 82-year model simulation of the QBO using a two- and-a-half-dimension model. Analysis of the model simulation indicates a positive correlation between the QBO period and the solar flux. Above 30 hPa, the easterly phase QBO duration increases more rapidly with solar flux than that of the westerly phase. However, below 50 hPa the westerly QBO duration increases faster. The mechanism for these changes is discussed.
DE: 1610 Atmosphere (0315, 0325)
DE: 1650 Solar variability (7537)
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 7538 Solar irradiance
SC: Global Environmental Change [GC]
MN: 2007 Fall Meeting