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Comment on ``Piecewise potential vorticity inversion: Elementary tests''

Methven, J. and de Vries, H. (2008) Comment on ``Piecewise potential vorticity inversion: Elementary tests''. Journal of the Atmospheric Sciences, 65 (9). pp. 3003-3008. ISSN 1520-0469

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To link to this article DOI: 10.1175/2008JAS2769.1

Abstract/Summary

Egger (2008) constructs some idealised experiments to test the usefulness of piecewise potential vorticity inversion (PPVI) in the diagnosis of Rossby wave dynamics and baroclinic development. He concludes that, ``PPVI does not help us to understand the dynamics of linear Rossby waves. It provides local tendencies of the streamfunction which are unrelated to the true ones. The same way, the motion of baroclinic waves in shear flow cannot be understood by using PPVI. Moreover, the effect of boundary temperatures as determined by PPVI is unrelated to the flow evolution.'' He goes further in arguing that we should not consider velocities as ``induced'' by PV anomalies defined by carving up the global domain. However, these conclusions partly reflect the limitations of his idealised experiments and the manner in which the PV components were partitioned from one another.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
ID Code:1146
Publisher:American Meteorological Society

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