f平面浅水系における回転渦対からの重力波放射(波動(2),一般講演)

概要

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Spontaneous gravity wave radiation from a co-rotating vortex pair is investigated in an f-plane shallow water system. It is well known that gravity waves play very important roles on the atmosphere driving global circulation, especially for the middle atmosphere, since they propagate far away from the source region and put significant amount of momentum and energy flux. Although recent observational studies suggested that gravity waves are radiated from vortical flows, such as polar night jet, sub-tropical jet, and tropical cyclones, the radiation process has not been fully understood. In the present study, we use the most simplified system of f-plane shallow water that includes both gravity waves and vortical flows, and investigate the spontaneous gravity wave radiation from a simple vortex pair both theoretically and numerically. In order to discuss the conditions of gravity wave radiation and propagation, we use the analogy with the theory of the aero-acoustic sound wave radiation (Lighthill theory).
2010-09-09