Robert Rand

VIDEO: Onshore wind turbines emit barometric pressure pulsations, yes, barometric pressure pulsations, as blades rotate through hundreds of feet of atmosphere. Wind industry consultants tend to downplay low frequency noise emissions from wind turbines by saying things like "There's infrasound everywhere." But there's nothing like wind turbine barometric pulsations pulsations{sic] in nature. Nothing. Here's a day's worth of barometric pressure data (acquired 50 Hz, 16-bit recording), then sped up 160x so you can hear the pulses.

The chart shows an "FFT" spectrogram. WT pulses are emitted starting around midnight at 0.7 Hz, about 1.4 seconds apart. The WT signature shows horizzontal[sic] lines. Natural sounds tend to be diffuse vertical lines from gentle wind breezes around the house, or the distant ~0.2 Hz band of microbaroms trending horizontally from surf many hundreds of miles away. Every WT pulse is slightly different because of inflow turbulence. The 2x harmonic at 1.4 Hz is stronger because wind turbine blades act like dipoles (they wave back and forth like long thin subwoofers). The turbines are feckless and slow down when they aren't getting as much wind, stop when not enough wind. Robert Rand on X

Confirmed as correct information from Robert Rand