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Barotropic instability in frontolytic strain
Author(s) -
Parker D. J.
Publication year - 1998
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49712454913
Subject(s) - barotropic fluid , instability , front (military) , strain (injury) , mechanics , vortex , physics , flow (mathematics) , transient (computer programming) , exponential growth , work (physics) , classical mechanics , meteorology , geology , biology , thermodynamics , computer science , anatomy , quantum mechanics , operating system
Recent observational studies have indicated that a front which is undergoing frontolytic strain may be conducive to rapid growth of waves or secondary cyclones. Previous work has shown that a frontogenetic strain flow will tend to suppress the growth of waves on a two‐dimensional vortex strip: here, the opposite case of negative strain is studied. Justification for considering a basic state which is frontolytic is presented, given the natural transience of this state. The results show that the growth is sufficiently rapid for instability to be relevant on the time‐scale of evolution of the parent front. Waves grow kinematically with the front itself, at an exponential rate. More rapid growth is possible for transient barotropically unstable modes but only for limited time. These results are discussed with a view to their impact on the understanding of atmospheric flows.