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

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

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2953e&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 19, p. 2953-2956

Physics

3

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Meteorology And Atmospheric Dynamics: Stratosphere/Troposphere Interactions, Meteorology And Atmospheric Dynamics: General Or Miscellaneous

Scientific paper

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.

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