... resulting in the formation of so-called rings or synoptic eddies These rings, and in particular the warm-core rings which are surface intensified, have long since been identified in the vicinity of the ... Fluids 3, 2 644 (1991) 44 , 53, 54 34 Miyazaki, T.: Elliptical instability in a stably stratified rotating fluid Phys Fluids 5, 2702 (1993) 44 , 45 35 Moore, D.W., Saffman, P.G.: The instability of ... discriminant, δ = R + (ζ + ), appears in (2.36) as the opposite of the determinant of the governing matrix Sipp and Jacquin [48 ] showed that if there exists a particular streamline on which δ < 0, the...