Heating of the lower thermosphere by the dissipation of acoustic waves

Computer Science – Sound

Scientific paper

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Acoustic Propagation, Atmospheric Heating, Gravity Waves, Infrasonic Frequencies, Thermosphere, Wave Attenuation, Acoustic Attenuation, Energy Dissipation, Sound Generators, Turbulence Effects, Water Waves, Wave Generation, Winter

Scientific paper

Infrasound of 0.2 Hz known as microbaroms, generated by interfering ocean waves, propagates into the lower thermosphere where it is dissipated between 110 and 140 km. It is shown here that under average conditions in winter the energy input into this region is of the order of 0.33 W/kg, the same as that estimated for gravity wave dissipation, and capable of producing a heating of at least 30 K/day. To arrive at this result different dissipation mechanisms are discussed, with the calculated attenuation compared to previously published observations and observations of natural infrasound at Palisades, N.Y. Increased acoustic attenuation due to the presence of turbulence is not, in general, in evidence.

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