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Tropospheric response to climate change: Implications for stratospheric dynamics

PI: Elisa Manzini
Institution: Instituto Nazionale di Geofisica e Vulcanologia
Additional Investigators: MA Giorgetta, K Krüger, M. Sigmond
Abstract:
Climate change in the stratosphere may occur either by direct radiative processes within the stratosphere in response to changes in atmospheric composition or by indirect dynamical processes, driven by the tropospheric response to changes in atmospheric composition. A first step in determining the causes of changes in the stratosphere is therefore to characterize the dynamics of the tropospheric response and to estimate the sensitivity to climate change of the wave activity that comes out of the troposphere and that may influence the stratosphere. With the aim of determining the implication of the tropospheric response to climate change for stratospheric dynamics, it is proposed to analyze selected IPCC simulations for selected time periods. At first, the characterization of the model response will be done by means of zonal means of basic fields as temperature and zonal wind, for appropriate time averages. After a further selection of model results, for interesting cases, it is proposed to estimate the wave activity emanating from the troposphere by means of the Transformed Eulerian Mean Diagnostics.
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