Abstract
Abstract The stability of the classical Norwegian polar front model is reinvestigated, using a numerical technique to supplement the precise conclusions which are possible in the limiting case of zero density difference or zero wavenumber. Instead of using the primitive equations, a system of filtered momentum equations which neglects the substantial derivative of the ageostrophic put of the horizontal wind is used to test the applicability to meteorological problems. For Rossby numbers ≪0.4, the agreement between the primitive and the semigeostrophic equations is found to he good provided that the Richardson number is not ton small. Unstable waves are found only at Rossby numbers less than a critical value; large-scale shear instability exists at small Richardson number and quasigeostrophic baroclinic instability occurs at larger Richardson number.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.