A spectacular and explosive volcanic eruption in January 2022 produced the highest plume of steam and ash in recorded history.
humanity has ever seen. But measuring the height of its plume with accuracy took some clever detective work.
As plumes extend through the troposphere , they lose heat, so the temperature of the top of the plume can be used to estimate height., this strategy loses accuracy because the temperature profile of the plume changes again, this time becoming warmer. So, a team of researchers led by Proud took a different approach.
The researchers still relied on data from satellites, but the measurement was based on parallax. If you've ever closed one eye after another and watched objects close to you seem to shift from side to side compared to their background, you've seen parallax in action.
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