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Quasi-Geostrophic Theory
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Author / Producer
Date
2024
Publication Type
Encyclopedia Entry
ETH Bibliography
yes
Citations
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Abstract
Synoptic- and larger-scale atmospheric flow in the extra-tropics is almost geostrophic in character indicating an approximate balance between the Coriolis and pressure gradient forces. The concept of quasi-geostrophy (QG) encapsulates compactly and elegantly the dynamics whereby a flow can retain this character although both the maintenance of geostrophy and the existence of other key flow features require a non-geostrophic flow component.
Consideration is given to the observational foundation of the QG concept, its mathematical formulation, and its subtle dynamics. In addition, a cursory case-study analysis is provided to demonstrate the essence of QG dynamics and the utility of the QG perspective.
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Publication status
published
Editor
Book title
Reference Module in Earth Systems and Environmental Sciences
Journal / series
Volume
(Pages 393–403)
Pages / Article No.
Publisher
Elsevier
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Dynamical meteorology; Vorticity; Divergence; Coriolis force; Potential vorticity; Rossby waves; Omega equation; Balanced flow; Cyclogenesis
Organisational unit
03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich