Long-wave instability of an isolated front

Details Long-wave instability of an isolated front Long-wave instability of an isolated front

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gapfd..25..235k&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics (ISSN 0309-1929), vol. 25, no. 4, Aug. 1983, p. 235-258.

Physics

Fluid Dynamics

20

Flow Stability, Fronts (Meteorology), Geostrophic Wind, Gravity Waves, Planetary Waves, Atmospheric Circulation, Kinetic Energy, Potential Energy, Reduced Gravity, Vorticity

Scientific paper

The stability of an isolated one-layer reduced gravity front is examined. It is shown that the system is unstable to long-wave disturbances provided merely that a simple condition on the depth profile is satisfied far from the front. The instability does not require the extremum of potential vorticity needed by quasi-geostrophic theory. The instability releases mean kinetic and mean potential energy from the system, but lacking a second layer cannot truly be termed baroclinic instability.

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