Journal of the Meteorological Society of Japan. Ser. II
Online ISSN : 2186-9057
Print ISSN : 0026-1165
ISSN-L : 0026-1165
Southern Hemisphere Planetary-scale Waves and Blocking
Harald Lejenas
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1988 Volume 66 Issue 5 Pages 777-781

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Abstract

The importance of stationary and travelling planetary-scale waves for southen hemisphere blocking has been investigated. The data used are 500-mb geopotential height data from nine winter seasons. The first three zonal harmonics of these data were decomposed in a low-pass filtered quasi-stationary part, and a travelling part being the difference between the unfiltered and filtered values.
The behaviour of the planetary-scale waves during periods with blocked flow is documented. It is found that unlike blocking in the northern hemisphere there is no systematic behaviour of the ultra-long waves during southern hemisphere blocking.

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