Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 2004 | Published
Journal Article Open

Quasi-biennial oscillation and quasi-biennial oscillation--annual beat in the tropical total column ozone: A two-dimensional model simulation

Abstract

The National Centers for Environmental Prediction–Department of Energy Reanalysis 2 data are used to calculate the monthly mean meridional circulation and eddy diffusivity from 1979 to 2002 for use in the California Institute of Technology–Jet Propulsion Laboratory two-dimensional (2-D) chemistry and transport model (CTM). This allows for an investigation of the impact of dynamics on the interannual variability of the tropical total column ozone for all years for which the Total Ozone Mapping Spectrometer and the Solar Backscatter Ultraviolet merged total ozone data are available. The first two empirical orthogonal functions (EOFs) of the deseasonalized and detrended stratospheric stream function capture 88% of the total variance on interannual timescales. The first EOF, accounting for over 70% of the interannual variance, is related to the quasi-biennial oscillation (QBO) and its interaction with annual cycles, the QBO-annual beat (QBO-AB). The 2-D CTM provides realistic simulations of the seasonal and interannual variability of ozone in the tropics. The equatorial ozone anomaly from the model is close to that derived from the observations. The phase and amplitude of the QBO are well captured by the model. The magnitude of the QBO signal is somewhat larger in the model than it is in the data. The QBO-AB found in the simulated ozone agrees well with that in the observed data.

Additional Information

© 2004 by the American Geophysical Union. Article first published online: 20 Aug 2004. Manuscript Accepted: 2 Jun 2004. Manuscript Revised: 24 Mar 2004. Manuscript Received: 24 Nov 2003. We thank T. Schneider for kindly giving us his code for computing the stream function, E. Fleming for sending us his stream function, and K. K. Tung, V. Natraj, X. L. Huang, M. Gerstell, C. Parkinson, and two anonymous reviewers for helpful comments. This work was supported by NASA grant NAG1-1806.

Attached Files

Published - jgrd11147.pdf

Files

jgrd11147.pdf
Files (696.5 kB)
Name Size Download all
md5:4334042ba76c67f9669fc17b13b43681
696.5 kB Preview Download

Additional details

Created:
August 22, 2023
Modified:
October 17, 2023