On the linear approximation of velocity and density profiles in the problem of baroclinic instability

The linear approximation of density and velocity profiles is compared to mo re realistic models Kith vertically inhomogeneous density gradients and non zero anomalous vorticity (i.e., the nonplanetary part of potential vorticit y). Calculations based on the parameters of "real life" currents in the Nor thern Pacific demonstrate that these effects. acting together can make baro clinic instability 2.5-6 times stronger and dramatically expand the spectra l range of unstable disturbances toward the short-wave region (by a factor of more than 20-30).