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The mean meridional circulation and midlatitude ozone buildup
Umeå University, Faculty of Science and Technology, Space Science.
2005 (English)In: Atmospheric Chemistry and Physics Discussions, ISSN 1680-7367, E-ISSN 1680-7375, Vol. 5, 3159-3172 p.Article in journal (Refereed) Published
Abstract [en]

The wintertime ozone buildup over the Northern Hemisphere (NH) midlatitudes and its connection with the mean meridional circulation in the stratosphere are examined statistically on a monthly basis from October to March ( 1980 - 2002). The ozone buildup begins locally in October with positive total ozone tendencies over the North Pacific, which spread eastward and westward in November and finally cover all midlatitudes in December. The local onset of the buildup in October is not evident in zonal mean ozone tendency, which is close to zero. From November to March, zonal mean total ozone tendency (50 degrees - 60 degrees N) shows a strong correlation (|r|= 0.7) with several zonal mean parameters associated to the mean meridional circulation, namely: eddy heat flux, temperature tendency, the vertical residual velocity and the residual streamfunction. At the same time, on the latitude-altitude cross section, correlation patterns between ozone tendency and widely used eddy heat flux are not uniform during winter. The strongest correlations are located equatorward ( almost throughout the stratosphere) or poleward ( only in the lower stratosphere) of the edge of the polar vortex. Such distribution may depend on the existence of the midlatitude and polar waveguides which defined refraction of upward propagating waves from the troposphere either to the midlatitude stratosphere or to the polar stratosphere. As a consequence of the nonuniform correlation patterns, heat flux averaged over the common region 45 degrees - 75 degrees N, 100 hPa is not always an optimum proxy for statistical models describing total ozone variability in midlatitudes. Other parameters approximating the strength of the mean meridional circulation have more uniform and stable correlation patterns with ozone tendency during winter. We show that the NH midlatitude ozone buildup has a stable statistical relationship with the mean meridional circulation in all months from October to March and half of the interannual variability in monthly ozone tendencies can be explained by applying different proxies of the mean meridional circulation.

Place, publisher, year, edition, pages
Katlenburg-Lindau: European Geosciences Union (EGU), 2005. Vol. 5, 3159-3172 p.
Keyword [en]
middle atmosphere, interannual variability, diabatic circulation, residual circulation, dynamical control, wave activity, stratosphere, winter, mesosphere, temperature
National Category
Meteorology and Atmospheric Sciences
URN: urn:nbn:se:umu:diva-4697DOI: 10.5194/acp-5-3159-2005ISI: 000233610100002OAI: diva2:143908
Available from: 2005-09-22 Created: 2005-09-22 Last updated: 2016-08-26Bibliographically approved
In thesis
1. Impact of Rossby waves on ozone distribution and dynamics of the stratosphere and troposphere
Open this publication in new window or tab >>Impact of Rossby waves on ozone distribution and dynamics of the stratosphere and troposphere
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Several physical mechanisms concerning the impact of Rossby waves on ozone distribution and circulation in the stratosphere and troposphere are studied in the thesis.

Summertime total ozone variability over Middle Asia and Northern Scandinavia shows similar wave-like behaviour with typical periods of 10-20 days and amplitudes of 20-50 Dobson units. These variations are caused by eastward travelling Rossby waves in the lower stratosphere. The same mechanism plays the primary role in the formation of an intense low ozone episode over Scandinavia in August 2003. A strong anticyclone was formed in the troposphere over Europe as a part of a Rossby wave train. The anticyclone coincides with a displaced Artic pool of low-ozone air in the stratosphere aloft of the anticyclone. A combination of the two above-mentioned processes results in the total ozone minimum over Northern Europe for summer 2003.

Interannual variability of the atmospheric circulation and total ozone during winter is strongly controlled by the diabatic (Brewer-Dobson) circulation which is driven by upward propagating waves from the troposphere. In the Northern Hemisphere midlatitudes, wintertime total ozone shows antiphase behaviour with the Arctic Oscillation (AO) index on interannual and decadal time-scales. Weaker (stronger) wave activity leads to less (more) northward ozone transport and to a stronger (weaker) AO.

Rossby wave activity occurs as episodic wave events and this wave forcing is not uniform during winter. The November-December stratospheric eddy heat flux is strongly anticorrelated with the January-February eddy heat flux in the midlatitude stratosphere and troposphere. Weaker upward wave fluxes in early winter lead to stronger upward wave fluxes from the troposphere as well as to a stronger polar night jet during midwinter and vice versa. Hence upward wave activity fluxes in early winter define, to a considerable extent, the subsequent evolution of the midwinter circulation in the stratosphere and troposphere.

32 p.
IRF Scientific Report, ISSN 0284-1703 ; 285
Meteorology, ozone, wave activity, trends, Brewer-Dobson circulation, Rossby waves, Arctic Oscillation, low ozone events, Meteorologi
National Category
Meteorology and Atmospheric Sciences
Research subject
urn:nbn:se:umu:diva-596 (URN)91-7305-946-3 (ISBN)
Public defence
2005-11-04, Aula, Rymdcampus, I10 road, Kiruna, 10:00
Available from: 2005-09-22 Created: 2005-09-22Bibliographically approved

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