Motivated by recent observations of plateaus and minima in the radial abundance distributions of heavy elements in the Milky Way and some other spiral galaxies, we propose a dynamical mechanism for the formation of such features around corotation. Our numerical simulations show that the non-axisymmetric gravitational field of spiral density waves generates cyclone and anticylone gas flows in th...

The circulation of the Eastern Mediterranean Sea is characterized by numerous recurrent or permanent anticyclonic structures, which modulate pathway main currents and exchange water masses in basin. This work aims to describe structures thermohaline properties with particular focus on two anticyclones, Pelops Cyprus gyres, using in-situ (drifters Argo floats) satellite (altimetry) data. gyre in...

The dipole vortex solutions of the Hasegawa-Mima drift wave or equivalently, thequasi-geostrophic Rossby wave equation are shown to be split up into long-lived monopole vortices (cyclones and anticyclones) in the presence of a small scalar, i.e. KdV type, nonlinearity. The lifetime of the dipole vortex varies inversely with the strength of the scalar nonlinearity.