Articles | Volume 15, issue 7
Atmos. Chem. Phys., 15, 3739–3754, 2015
Atmos. Chem. Phys., 15, 3739–3754, 2015

Research article 07 Apr 2015

Research article | 07 Apr 2015

Methane as a diagnostic tracer of changes in the Brewer–Dobson circulation of the stratosphere

E. E. Remsberg

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Cited articles

Al-Saadi, J. A., Pierce, R. B., Fairlie, T. D., Kleb, M. M., Eckman, R. S., Grose, W. L., Natarajan, M., and Olsen, J. R.: Response of middle atmosphere chemistry and dynamics to volcanically elevated sulfate aerosol: three-dimensional coupled model simulations, J. Geophys. Res., 106, 27255–27275, 2001.
Andrews, D. G., Holton, J. R., and Leovy, C. B.: Middle atmosphere dynamics, Academic Press, Inc., Orlando, Florida, 489 pp., 1987.
Baldwin, M. P. and Dunkerton, T. J.: Biennial, quasi-biennial, and decadal oscillations of potential vorticity in the northern stratosphere, J. Geophys. Res., 103, 3919–3928, 1998.
Birner, T. and Bönisch, H.: Residual circulation trajectories and transit times into the extratropical lowermost stratosphere, Atmos. Chem. Phys., 11, 817–827,, 2011.
Bönisch, H., Engel, A., Birner, Th., Hoor, P., Tarasick, D. W., and Ray, E. A.: On the structural changes in the Brewer–Dobson circulation after 2000, Atmos. Chem. Phys., 11, 3937–3948,, 2011.
Short summary
Time series of the satellite-observed stratospheric tracer, CH4, are analyzed to see whether they indicate a significant trend for the hemispheric Brewer--Dobson circulation (BDC) for 1992-2005. Trends in CH4 for the lower stratosphere are generally positive and equivalent to those of the troposphere. However, the Northern Hemisphere BDC is clearly accelerated in the mid-stratosphere (20 to 7hPa). Corresponding trends for the Southern Hemisphere are smaller and less significant.
Final-revised paper