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Influence of anthropogenic climate gas changes on the summer mesospheric/lower thermospheric meridional wind

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Abstract:

A model study is performed to simulate the effect of the observed atmospheric CO2 increase and O3 decrease on the northern hemisphere (NH) summer middle atmosphere meridional circulation. It is found that, due to a reduction of gravity wave filtering through the stratospheric / mesospheric easterly jet, the mesopause region meridional wind at midlatitudes decreases by up to 2ms-1, i.e. about 25%, if the middle atmospheric CO2 content is increased by 10% and O3 is reduced up to 10% at high latitudes reflecting the changes of atmospheric composition over the last 30 years. The model results are in good agreement with midlatitude long-term radar wind measurements at that altitude.



Mit Hilfe eines einfachen Zirkulationsmodells wurde der Einfluss des beobachteten CO2-Anstiegs und des Ozonru¨ckgangs auf die mesospha¨rische Meridionalzirkulation der sommerlichen Nordhemispha¨re untersucht. Es ergibt sich, dass durch eine Verringerung der Filterwirkung der Ostwinde in der Stratospha¨re und Mesospha¨re in Bezug auf Schwerewellen der Meridionalwind um 25% reduziert wird, wenn der Gehalt an CO2 in der mittleren Atmospha¨re um etwa 10% steigt und derjenige von O3 um 10% sinkt. Diese Modellergebnisse sind in U¨bereinstimmung mit Ergebnissen von Radarwindmessungen.

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Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2003/0012-0037

Publication date: January 1, 2003

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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