The rhythmic beating of geysers at Doublet Pool provides insight into the changes in energy within the Yellowstone hydrothermal system. As throngs of people gather around Old Faithful, eagerly anticipating its next eruption, a small pool located just north of Yellowstone National Park's most famous
The water surface of Doublet Pool vibrating. Credit: Jamie Farrell/University of Utah
The regular thumping of Doublet Pool is not just a novel spectacle for visitors. A recent study conducted by researchers from thehas revealed that the time between each episode of thumping is a direct indicator of the amount of energy heating the pool from the bottom, as well as how much heat is escaping through the surface. Doublet Pool, the study authors conclude, serves as a sort of “thumping thermometer” for Yellowstone National Park.
The thumping, Lin said, which lasts about 10 minutes, is caused by bubbles in the plumbing system that feeds water, heated by a magma system beneath Yellowstone, to Doublet Pool. When those bubbles of water vapor reach the cool upper reaches of the hydrothermal conduit, they collapse suddenly. Thump.
What else was happening on Geyser Hill during those same times? On September 15, 2018, Ear Spring, which is 200 feet northwest of Doublet Pool, erupted for the first time since 1957. After the eruption, the water in Doublet Pool boiled. The team is still working to understand how the blowing wind at the surface of the pool impacts the heat at the bottom, but it’s clear that the wind removes heat energy from the water, just like blowing over a hot drink–or a pot of pasta about to boil over—cools it off.
The heating rate for Doublet Pool works out to around 3-7 megawatts of energy. For comparison, Lin said, it would take about 100 household furnaces burning at the same time to heat up Doublet Pool enough to thump.
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