HR: 1340h
AN: A13D-0977    [Abstracts]
TI: Spatial Patterns and Mechanisms of the Quasi-biennial Oscillation-Annual Beat of Ozone
AU: * Shia, R
EM: rls@gps.caltech.edu
AF: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, 91125
AU: Jiang, X
EM: xun@gps.caltech.edu
AF: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, 91125
AU: Jiang, X
EM: xun@gps.caltech.edu
AF: Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, 91125
AU: Jones, D B
EM: dbj@atmosp.physics.utoronto.ca
AF: Department of Physics, University of Toronto, Toronto, ON M5S 1A7
AU: Waliser, D E
EM: duane.waliser@jpl.nasa.gov
AF: Sciences Division, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, MS 183-501
AU: Yung, Y L
EM: yly@gps.caltech.edu
AF: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, 91125
AB: An idealized two-dimensional (2-D) chemistry and transport model (CTM) is used to investigate the spatial patterns of, and mechanism for, the QBO-annual beat (QBO-AB) signal in ozone in the tropics and subtropics. Principal component analysis (PCA) is applied to the detrended, deseasonalized and filtered total column ozone anomaly from the standard model. The first two empirical orthogonal functions (EOFs) capture over 98.5% of the total variance. The first EOF, accounting for 70.3% of the variance, displays a structure attributable to the approximately symmetric QBO with a period of 28 months. The second EOF, capturing 28.2% of the variance, is related to the QBO-AB at 20 months. An extended EOF analysis reveals the characteristic pattern of the downward propagation of QBO and upward propagation of QBO-AB. The upward propagation of QBO-AB is a result of the interaction between the Brewer-Dobson Circulation (BDC) and QBO. We also found similar propagations of the ozone QBO and QBO-AB in the Merged Ozone Data.
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
DE: 1610 Atmosphere (0315, 0325)
DE: 1620 Climate dynamics (0429, 3309)
DE: 3334 Middle atmosphere dynamics (0341, 0342)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005