Abstract: ingular vectors on a barotropic circular vortex consisting of three regions of piecewise-constant vorticity are investigated under the L2 norm to reveal the shape and growth rate of possible perturbations that may contribute ...

Abstract: he linear stability of a zonal flow confined in a domain within horizontal top and bottom boundaries is examined under full consideration of the Coriolis force. The basic zonal flow is assumed to be in thermal wind balance ...

Abstract: he geometry and behavior of the polygonal eye of Typhoon Sinlaku (T0216) are presented both objectively and quantitatively based on the ground-based radar data by using two types of spectral analyses (i.e., Fourier analysis ...

Abstract: If a cyclonic vortex is bounded by a zero isotach surrounding its center at some radius, it is inevitably accompanied by negative vorticity regions somewhere within it. Since the radial gradient of vorticity changes its ...

Abstract: An elliptical eye was observed in Typhoon Herb during its passage around the Sakishima Islands located in the southwest of the Okinawa Islands in Japan on 30?31 July 1996. Later analysis showed that this elliptical eye had ...