✦ LIBER ✦

The evaluation of vertical velocity and thickness tendency from Sutcliffe's theory

✍ Scribed by F. H. Bushby

Publisher: John Wiley and Sons
Year: 1952
Tongue: English
Weight: 534 KB
Volume: 78
Category: Article
ISSN: 0035-9009
DOI: 10.1002/qj.49707833705

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✦ Synopsis

Abstract

The field of mean vertical velocity in the 1,000–500 mb layer of the atmosphere due to large‐scale atmospheric systems is computed for six synoptic situations. The method is based on the Sutcliffe ‘development’ theory and an atmospheric model is used in which the isobaric divergence of the velocity field is taken to be a linear function of pressure passing through a level of non‐divergence in mid‐troposphere. The effect of vertical stability on vertical velocity is examined.

The components of thickness tendency due to the computed vertical velocity are evaluated and compared with the differences between the observed thickness changes and their advective components. Some reference is made to the relationship between vertical velocity and rate of rainfall.

General results apparent from the six situations examined are stated and one situation is described in detail. It is concluded that in middle latitudes the difference in vertical velocity between an ordinary stable and a neutral atmosphere may frequently be fourfold and that the component of thickness tendency evaluated from the computed vertical velocity gives a reasonable estimate of the effect of vertical motion on changes in thickness.

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