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A numerical investigation of polar lows

โœ Scribed by C. N. Duncan

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
773 KB
Volume
103
Category
Article
ISSN
0035-9009

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โœฆ Synopsis

Abstract

A quasiโ€geostrophic numerical model is employed to find normal mode solutions for unstable disturbances with low static stability near the earth's surface. Three occasions on which polar lows developed are analysed to provide the necessary data for the model. The normal mode solutions which are obtained are, therefore, those which have the highest growth rates under conditions in which polarโ€air depressions have developed. Since the model is twoโ€dimensional, being a crossโ€section through the mean flow, the perturbation amplitude and energy conversion rates of the growing disturbances in this plane are described for each case. It is shown that horizontal variations in static stability are an important factor in the forecasting problem and some criteria for polarโ€low development are suggested.

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