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Stratospheric temperature trends: impact of ozone variability and the QBO

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

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Stratospheric temperature trends: impact of ozone variability and the QBO
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Dall'Amico, MauroMauro.DallAmico@dlr.de
Gray, Lesley J.NICHT SPEZIFIZIERT
Rosenlof, Karen H.NICHT SPEZIFIZIERT
Scaife, Adam A.NICHT SPEZIFIZIERT
Shine, Keith P.NICHT SPEZIFIZIERT
Stott, Peter A.NICHT SPEZIFIZIERT
Datum:2010
Erschienen in:Climate Dynamics
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:34
DOI :10.1007/s00382-009-0604-x
Seitenbereich:Seiten 381-398
Verlag:Springer
Status:veröffentlicht
Stichwörter: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 - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Dynamik der Atmosphäre
Hinterlegt von: Mauro Dall Amico
Hinterlegt am:05 Aug 2009 12:05
Letzte Änderung:12 Dez 2013 20:41

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