What is "atmospheric tide"

n. Pressure waves in the atmosphere similar to the tides of the ocean, produced by the gravitational influence of the moon and by thermal expansion and contraction.

Atmospheric tides are global-scale periodic oscillations of the atmosphere. In many ways they are analogous to ocean tides. Atmospheric tides can be excited by:

• The regular day– night cycle in the Sun's heating of the atmosphere ( insolation)
• The gravitational field pull of the Moon
• Non-linear interactions between tides and planetary waves.
• Large-scale latent heat release due to deep convection in the tropics.