A perturbation method is used to find approximate analytical solution to the problem about transformation of a low frequency internal wave in a two-layer rotating liquid over a localized underwater obstacle of a mesoscale length. It is shown that the perturbation of a wave in the upper layer is proportional to its relative thickness and for actual oceanic stratification in the presence of the seasonal pycnocline is insignificant even for obstacles whose height is comparable with the thickness of the lower layer.
Department of Marine and Inland Water Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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