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Quasi-biennial oscillation and tracer distributions in a coupled chemistry-climate model

Tian, W. S., Chipperfield, M. P., Gray, L. J. and Zawodny, J. M. (2006) Quasi-biennial oscillation and tracer distributions in a coupled chemistry-climate model. Journal of Geophysical Research, 111 (D20). ISSN 0148-0227

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To link to this article DOI: 10.1029/2005JD006871

Abstract/Summary

[ 1] We have used a fully coupled chemistry-climate model (CCM), which generates its own wind and temperature quasi-biennial oscillation (QBO), to study the effect of coupling on the QBO and to examine the QBO signals in stratospheric trace gases, particularly ozone. Radiative coupling of the interactive chemistry to the underlying general circulation model tends to prolong the QBO period and to increase the QBO amplitude in the equatorial zonal wind in the lower and middle stratosphere. The model ozone QBO agrees well with Stratospheric Aerosol and Gas Experiment II and Total Ozone Mapping Spectrometer satellite observations in terms of vertical and latitudinal structure. The model captures the ozone QBO phase change near 28 km over the equator and the column phase change near +/- 15 degrees latitude. Diagnosis of the model chemical terms shows that variations in NOx are the main chemical driver of the O-3 QBO around 35 km, i.e., above the O-3 phase change.

Item Type:Article
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
ID Code:5491
Uncontrolled Keywords:GENERAL-CIRCULATION MODEL GRAVITY-WAVE PARAMETERIZATION INTERANNUAL VARIABILITY 2-DIMENSIONAL MODEL DIMENSIONAL MODEL MIDDLE ATMOSPHERE OZONE QBO STRATOSPHERE SIMULATION IMPACT
Additional Information:D20301
Publisher:American Geophysical Union

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