We report a discovery of steady long-living slowly eastward moving large-scale coherent twin cyclones, the equatorial modons, in the shallow water model in the equatorial beta-plane, the archetype model of the ocean and atmosphere dynamics in tropics. We start by constructing analytical asymptotic modon solutions in the non-divergent velocity approximation and then show by simulations with a high-resolution numerical scheme that such configurations evolve into steady dipolar solutions of the full model. In the atmospheric context, the modons persist in the presence of moist convection, being accompanied and enhanced by specific patterns of water-vapour condensation.
https://doi.org/10.1063/1.5080415 Accessed 78 times | Last updated 05.02.2019
Rostami2019_POF.pdf Accessed 407 times | Last updated 05.02.2019
Rostami, M., Zeitlin, V. (2019): Eastward-moving convection-enhanced modons in shallow water in the equatorial tangent plane. AIP – In: Physics of Fluids, Vol. 31, DOI: 10.1063/1.5080415
|Authors||Rostami, Masoud and Zeitlin, Vladimir|
|Title||Eastward-moving convection-enhanced modons in shallow water in the equatorial tangent plane|
|Journal||Physics of Fluids|