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From NPR:
"The violent 2022 eruption of Tonga’s Hunga Tonga-Hunga Ha’apai volcano injected an unprecedented amount of water directly into the stratosphere — and the vapor will stay there for years, likely affecting the Earth’s climate patterns, NASA scientists say.
The massive amount of water vapor is roughly 10% of the normal amount of vapor found in the stratosphere, equaling more than 58,000 Olympic-size swimming pools.
“We’ve never seen anything like it,” said atmospheric scientist Luis Millán, who works at NASA’s Jet Propulsion Laboratory. Millán led a study of the water the volcano sent into the sky; the team’s research was published in Geophysical Research Letters.
Earlier large volcanic eruptions have affected climate, but they usually cool temperatures, because they send light-scattering aerosols into the stratosphere. Those aerosols act as a sort of massive layer of sunscreen. But since water vapor traps heat, the Tongan eruption could temporarily raise temperatures a bit, the researchers said.
It normally takes around 2-3 years for sulfate aerosols from volcanoes to fall out of the stratosphere. But the water from the Jan. 15 eruption could take 5-10 years to fully dissipate."
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