Tonga volcano blast was uncommon, could even warm the Earth & More News

 

NEW YORK (AP) — When an undersea volcano erupted in Tonga in January, its watery blast was big and weird — and scientists are nonetheless attempting to know its impacts.

The volcano, referred to as Hunga Tonga-Hunga Ha’apai, shot hundreds of thousands of tons of water vapor excessive up into the environment, in response to a examine revealed Thursday in the journal Science.

The researchers estimate the eruption raised the quantity of water in the stratosphere — the second layer of the environment, above the vary the place people reside and breathe — by round 5%.

Now, scientists are attempting to determine how all that water could have an effect on the environment, and whether or not it would warm Earth’s floor over the subsequent few years.

“This was a once-in-a-lifetime occasion,” mentioned lead writer Holger Voemel, a scientist at the National Center for Atmospheric Research in Colorado.

Big eruptions normally cool the planet. Most volcanoes ship up giant quantities of sulfur, which blocks the solar’s rays, defined Matthew Toohey, a local weather researcher at the University of Saskatchewan who was not concerned in the examine.

The Tongan blast was a lot soggier: The eruption began beneath the ocean, so it shot up a plume with rather more water than standard. And since water vapor acts as a heat-trapping greenhouse gasoline, the eruption will most likely increase temperatures as a substitute of reducing them, Toohey mentioned.

It’s unclear simply how a lot warming could be in retailer.

Karen Rosenlof, a local weather scientist at the National Oceanic and Atmospheric Administration who was not concerned with the examine, mentioned she expects the results to be minimal and momentary.

“This quantity of enhance may warm the floor a small quantity for a brief period of time,” Rosenlof mentioned in an e-mail.

The water vapor will stick round the higher environment for just a few years earlier than making its manner into the decrease environment, Toohey mentioned. In the meantime, the further water may additionally velocity up ozone loss in the environment, Rosenlof added.

But it’s arduous for scientists to say for positive, as a result of they’ve by no means seen an eruption like this one.

The stratosphere stretches from round 7.5 miles to 31 miles (12 km to 50 km) above Earth and is normally very dry, Voemel defined.

Voemel’s crew estimated the volcano’s plume utilizing a community of devices suspended from climate balloons. Usually, these instruments can’t even measure water ranges in the stratosphere as a result of the quantities are so low, Voemel mentioned.

Another analysis group monitored the blast utilizing an instrument on a NASA satellite tv for pc. In their examine, revealed earlier this summer season, they estimated the eruption to be even larger, including round 150 million metric tons of water vapor to the stratosphere — thrice as a lot as Voemel’s examine discovered.

Voemel acknowledged that the satellite tv for pc imaging might need noticed elements of the plume that the balloon devices couldn’t catch, making its estimate increased.

Either manner, he mentioned, the Tongan blast was in contrast to something seen in current historical past, and finding out its aftermath could maintain new insights into our environment.

___

The Associated Press Health and Science Department receives assist from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely accountable for all content material.

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