South of the Usk, a completely different approach seems to hold sway 阿斯克以南盛行的似乎是一种完全不同的方式。
The sufficient and necessary conditions of baroclinic instability of the basic flow including meridional circulation are K2 < 2F and ( Usk+ Vsl) 2> c2k2.The baroclinic instability can occur in only meridional flows. 基本气流含有经圈环流的斜压不稳定充要条件为:K~2<2F和(Usk+Vs1)~2>U0k~2.因而,对纯经向基流也可以出现斜压不稳定。