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On the origin of steep edges and filaments in vorticity and potential vorticity fieldsHigh-resolution numerical calculations are shown which capture the fundamental process responsible for the intensification of vorticity gradients in an isolated vortex subject to externally imposed distrubances. Imposition of almost any weak strain or shear field in stripping away the relatively weak vorticity at the edge of the vortex and leaves it with gradients four to six orders of magnitude greater than in the initial state. Calculations displaying such enormous gradients have never been reported previously, because of the artificial eddy diffusivities that always limit such gradients in standard numerical models. The present calculations, which have no such limitations, have been made possible by the development of a novel and robust new numerical technique for vortex dynamics called contour surgery.
Document ID
19890005222
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dritschel, D. G. (Cambridge Univ. Cambridge, United Kingdom)
Date Acquired
September 5, 2013
Publication Date
May 1, 1988
Publication Information
Publication: NASA, Goddard Space Flight Center, Polar Ozone Workshop. Abstracts
Subject Category
Environment Pollution
Accession Number
89N14593
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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