Atmospheric Secondary Ozone Layer

SANTEE and PEEDEE helped perform and analyze output from numerical simulations of the National Center for Atmospheric Research (NCAR) Whole Atmosphere Community Climate Model (WACCM). Here, MAUI helped us understand the unusual increase in ozone amount during wintertime breakdown of the circumpolar flow (known as the polar vortex). In the above figure, we see a strong enhancement in ozone around the 100-km altitude when the breakdown occurs (at lifecycle day 0). This study was led by an undergraduate student (Olga V. Tweedy) who is now a Ph.D. student at the Johns Hopkins University.

Caption.  Composite evolution of the night-time ozone concentration over the wintertime Northern Hemisphere polar region.

Acknowledgements.  This study was supported by the National Science Foundation (NSF) under grants AGS-RUI-1116123 and AGS-MRI-0958616 and the South Carolina NASA Space Grant. V. Limpasuvan was also supported by the Kerns Palmetto Professorship through the Provost’s Office.


Tweedy, O. V.. 2012: Polar Ozone Maxima during Vortex Break-Down, 2012 Proceedings to the National Conference on Undergraduate Research, Weber State University, Ogden, Utah

Tweedy, O. V., V. Limpasuvan, Y. J. Orsolini, A. K. Smith, R. Garcia, C. Randall, O.-K. Kvissel, D. Kinnison, F. Stordal, V. Harvey, and A. Chandran, 2013: Nighttime Secondary Ozone Layer during Major Stratospheric Sudden Warmings in Specified-Dynamics WACCM, Journal of Geophysical Research, 118, doi:10.1002/jgrd.50651.

Key Presentations:

Council on Undergraduate Research (CUR) Poster on the Hill, “Wintertime Polar Ozone Evolution during Stratospheric Vortex Break­Down”, O. Tweedy, Capitol Hill (Washington, D.C; 24 April 2012)

American Geophysical Union (AGU) Fall Meeting 2012, “The Response of Polar Mesosphere-Low Thermospheric Ozone to Stratospheric Sudden Warming”, O. Tweedy, V. Limpasuvan, A. Smith, Y. Orsolini, C. Randall, R. Garcia, D. Kinnison, A. Chandra, O-K. Kvissel (San Francisco, CA; 6 December 2012)

Stratospheric-troposphere Processes and their Role in Climate (SPARC) 2014 General Assembly, “Nighttime Secondary Ozone Layer during Major Stratospheric Sudden Warmings in Specified-Dynamics WACCM”, O.V. Tweedy, V. Limpasuvan, Y. Orsolini, A. Smith, R. Garcia, D. Kinnison, C. Randall, O-K. Kvissel, F. Stordal, V. Lynn Harvey, A. Chandran (Queenstown, New Zealand; 12-17 January 2014)