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On the mix-down times of dynamically active potential vorticity filaments

Esler, JG; Polvani, LM; Plumb, RA; (1999) On the mix-down times of dynamically active potential vorticity filaments. Geophysical Research Letters , 26 (19) 2953 - 2956. 10.1029/1999GL010875. Green open access

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Abstract

A simple model is used to study the evolution of potential vorticity filaments, viewed in cross-section, subject to steady shear and deformation flows representative of the large-scale atmospheric circulation. It is found that the balanced, ageostrophic circulation induced by the anomalous potential vorticity can cause the evolution of a dynamically active filament to differ substantially from that of a dynamically passive filament in a similar background flow. It is suggested that estimates of the mix-down time of material contained in atmospheric filaments need to be corrected to allow for this effect.

Type:Article
Title:On the mix-down times of dynamically active potential vorticity filaments
Open access status:An open access version is available from UCL Discovery
DOI:10.1029/1999GL010875
Publisher version:http://dx.doi.org/10.1029/1999GL010875
Language:English
Additional information:Copyright 1999 by the American Geophysical Union
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Mathematics

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