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Stratospheric temperature trends: impact of ozone variability and the QBO

Dall'Amico, Mauro and Gray, Lesley J. and Rosenlof, Karen H. and Scaife, Adam A. and Shine, Keith P. and Stott, Peter A. (2010) Stratospheric temperature trends: impact of ozone variability and the QBO. Climate Dynamics, 34, pp. 381-398. Springer. DOI: 10.1007/s00382-009-0604-x.

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Official URL: http://www.springerlink.com/content/n56tw2k9xj546247/fulltext.pdf

Abstract

In most climate simulations used by the Intergovernmental Panel on Climate Change 2007 fourth assessment report, stratospheric processes are only poorly represented. For example, climatological or simple specifications of time-varying ozone concentrations are imposed and the quasi-biennial oscillation (QBO) of equatorial stratospheric zonal wind is absent. Here we investigate the impact of an improved stratospheric representation using two sets of perturbed simulations with the Hadley Centre coupled ocean atmosphere model HadGEM1 with natural and anthropogenic forcings for the 1979–2003 period. In the first set of simulations, the usual zonal mean ozone climatology with superimposed trends is replaced with a time series of observed zonal mean ozone distributions that includes interannual variability associated with the solar cycle, QBO and volcanic eruptions. In addition to this, the second set of perturbed simulations includes a scheme in which the stratospheric zonal wind in the tropics is relaxed to appropriate zonal mean values obtained from the ERA-40 re-analysis, thus forcing a QBO. Both of these changes are applied strictly to the stratosphere only. The improved ozone field results in an improved simulation of the stepwise temperature transitions observed in the lower stratosphere in the aftermath of the two major recent volcanic eruptions. The contribution of the solar cycle signal in the ozone field to this improved representation of the stepwise cooling is discussed. The improved ozone field and also the QBO result in an improved simulation of observed trends, both globally and at tropical latitudes. The Eulerian upwelling in the lower stratosphere in the equatorial region is enhanced by the improved ozone field and is affected by the QBO relaxation, yet neither induces a significant change in the upwelling trend.

Document Type:Article
Title:Stratospheric temperature trends: impact of ozone variability and the QBO
Authors:
AuthorsInstitution or Email of Authors
Dall'Amico, MauroMauro.DallAmico@dlr.de
Gray, Lesley J.UNSPECIFIED
Rosenlof, Karen H.UNSPECIFIED
Scaife, Adam A.UNSPECIFIED
Shine, Keith P.UNSPECIFIED
Stott, Peter A.UNSPECIFIED
Date:2010
Journal or Publication Title:Climate Dynamics
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:34
DOI:10.1007/s00382-009-0604-x
Page Range:pp. 381-398
Publisher:Springer
Status:Published
Keywords:All-forcings simulations of recent climate assessed by the IPCC 2007 AR4 - Observed zonal mean ozone distributions - QBO of stratospheric equatorial zonal wind - 11-year solar cycle - Volcanic eruptions of El Chichón and Mt. Pinatubo - Variability and trends of stratospheric temperatures
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Mauro Dall Amico
Deposited On:05 Aug 2009 12:05
Last Modified:12 Dec 2013 20:41

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