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000820659 1001_ $$0P:(DE-Juel1)129141$$aPloeger, Felix$$b0$$eCorresponding author
000820659 245__ $$aSeasonal and inter-annual variability of lower stratospheric age of air spectra
000820659 260__ $$aKatlenburg-Lindau$$bEGU$$c2016
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000820659 520__ $$aTrace gas transport in the lower stratosphere is investigated by analysing seasonal and inter-annual variations of the age of air spectrum – the probability distribution of stratospheric transit times. Age spectra are obtained using the Chemical Lagrangian Model of the Stratosphere (CLaMS) driven by ERA-Interim winds and total diabatic heating rates, and using a time-evolving boundary-impulse-response (BIER) method based on multiple tracer pulses. Seasonal age spectra show large deviations from an idealized stationary uni-modal shape. Multiple modes emerge in the spectrum throughout the stratosphere, strongest at high latitudes, caused by the interplay of seasonally varying tropical upward mass flux, stratospheric transport barriers and recirculation. Inter-annual variations in transport (e.g. quasi-biennial oscillation) cause significant modulations of the age spectrum shape. In fact, one particular QBO phase may determine the spectrum's mode during the following 2–3 years. Interpretation of the age spectrum in terms of transport contributions due to the residual circulation and mixing is generally not straightforward. It turns out that advection by the residual circulation represents the dominant pathway in the deep tropics and in the winter hemisphere extratropics above 500 K, controlling the modal age in these regions. In contrast, in the summer hemisphere, particularly in the lowermost stratosphere, mixing represents the most probable pathway controlling the modal age.
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000820659 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-16-10195-2016$$gVol. 16, no. 15, p. 10195 - 10213$$n15$$p10195 - 10213$$tAtmospheric chemistry and physics$$v16$$x1680-7324$$y2016
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