Propagation of surface deformation coupled with convection waves under the excitation of a chemical wave train

Oscillation of surface deformation synchronized with oscillation of convection was found in a thin solution layer of a Belousov-Zhabotinsky reaction in which a spiral wave train was excited. To clarify the underlying mechanism of establishing oscillatory convection in the system, we measured the velocity of the convective flow at the surface and the angle of the surface tilt of the solution simultaneously. The convection and surface deformation showed propagation behavior. The propagating waves had a long wavelength (more than 100 mm) and a rapid propagation velocity (about 2.5 mm/s) compared to those of a chemical wave train.