Local mixing events in the upper-troposphere and lower-stratosphere. Part I: detection with the Lyapunov diffusivity

D'Ovidio, Francesco; Shuckburgh, Emily; Legras, Bernard. 2009 Local mixing events in the upper-troposphere and lower-stratosphere. Part I: detection with the Lyapunov diffusivity. Journal of the Atmospheric Sciences, 66 (12). 3678-3694. 10.1175/2009JAS2982.1

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Abstract/Summary

A new diagnostic (the "Lyapunov diffusivity'') is presented that has the ability to quantify isentropic mixing in diffusion units and detects local mixing events by describing latitude-longitude variability. It is a hybrid diagnostic, combining the tracer-based effective diffusivity with the particle-based Lyapunov exponent calculation. Isentropic mixing on the 350-K surface shows that there is significant longitudinal variation to the strength of mixing at the northern subtropical jet, with a strong mixing barrier over Asia and the western Pacific, a weaker mixing barrier over the western Atlantic, and active mixing regions at the jet exits over the eastern Pacific and Atlantic.

Item Type:	Article
Identification Number/DOI:	10.1175/2009JAS2982.1
Programmes:	BAS Programmes > Other Special Projects
ISSN:	0022-4928
NORA Subject Terms:	Atmospheric Sciences
Date made live:	25 Oct 2010 13:35
URI:	http://nora.nerc.ac.uk/id/eprint/10737

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