References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-13-12187-2013

Net influence of an internally generated quasi-biennial oscillation on modelled stratospheric climate and chemistry

Hurwitz

M. M.

¹ ² Oman

L. D.

² Newman

P. A.

² Song

I.-S.

https://orcid.org/0000-0001-7211-6035

Goddard Earth Science Technology and Research (GESTAR), Morgan State University, Baltimore, MD, USA

NASA Goddard Space Flight Center, Greenbelt, MD, USA

Korea Institute of Atmospheric Prediction Systems (KIAPS), Seoul, South Korea

17 12 2013

13 24 12187 12197

2013

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/13/12187/2013/acp-13-12187-2013.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/13/12187/2013/acp-13-12187-2013.pdf

A Goddard Earth Observing System Chemistry-Climate Model (GEOSCCM) simulation with strong tropical non-orographic gravity wave drag (GWD) is compared to an otherwise identical simulation with near-zero tropical non-orographic GWD. The GEOSCCM generates a quasi-biennial oscillation (QBO) zonal wind signal in response to a tropical peak in GWD that resembles the zonal and climatological mean precipitation field. The modelled QBO has a frequency and amplitude that closely resembles observations. As expected, the modelled QBO improves the simulation of tropical zonal winds and enhances tropical and subtropical stratospheric variability. Also, inclusion of the QBO slows the meridional overturning circulation, resulting in a generally older stratospheric mean age of air. Slowing of the overturning circulation, changes in stratospheric temperature and enhanced subtropical mixing all affect the annual mean distributions of ozone, methane and nitrous oxide. Furthermore, the modelled QBO enhances polar stratospheric variability in winter. Because tropical zonal winds are easterly in the simulation without a QBO, there is a relative increase in tropical zonal winds in the simulation with a QBO. Extratropical differences between the simulations with and without a QBO thus reflect the westerly shift in tropical zonal winds: a relative strengthening of the polar stratospheric jet, polar stratospheric cooling and a weak reduction in Arctic lower stratospheric ozone.

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