Melting glaciers could cause more volcanic eruptions

Climate change is likely to have an explosive consequence: volcanic eruptions. Antarctic glaciers have been slowly melting as temperatures rise, unearthing hidden volcanoes in the process. The eruptions of these could further worsen climate change and disrupt global ecosystems. But melting glaciers will only continue without the proper intervention to curb emissions.

Lava locked away

As warming temperatures cause glaciers to melt, that melt raises sea levels, which in turn tampers with the oceans’ saltwater ecosystems and can lead to flooding. Melting glaciers may also lead to an increase in volcanic eruptions, according to a new study presented at the Goldschmidt Conference in Prague and set to be peer reviewed later this year. “Hundreds of dormant subglacial volcanoes worldwide — particularly in Antarctica — could become more active as climate change accelerates glacier retreat,” said a news release about the study.

Evidence suggests that the “thick ice caps act as lids on volcanoes,” said Inside Climate News. Once the weight is removed, there is no longer pressure on the magma chamber underneath, allowing for eruptions to occur. “When you take the load off, it’s just like opening a Coca-Cola bottle or a champagne bottle,” Brad Singer, a geoscientist at the University of Wisconsin who led the research, said to Inside Climate News. “It’s under pressure, and the dissolved gases in the melt come out as bubbles.”

The researchers analyzed six volcanoes in Chile to investigate how the Patagonian Ice Sheet’s changes over time affected volcanic behavior. While the link between glaciers and volcanoes had been previously observed in Iceland, this study is one of the first to “show a surge in volcanism on a continent in the past, after the last ice age ended,” said The Guardian. The same processes could occur in Antarctica, parts of North America, New Zealand and Russia as the ice sheets melt.

A glacial pace

Increased volcanic activity will likely have detrimental effects on the climate and global ecosystem. “The cumulative effect of multiple eruptions can contribute to long-term global warming because of a buildup of greenhouse gases,” Pablo Moreno-Yaeger, who presented the research at the conference, said in the news release. “This creates a positive feedback loop, where melting glaciers trigger eruptions, and the eruptions in turn could contribute to further warming and melting.”

Unfortunately, the world’s glaciers are now melting faster than ever before. Over the past approximately ten years, “glacier losses were more than a third higher than during the period 2000-2011,” said the BBC. And the potential consequences go beyond just volcanic eruptions. Eruptions “release sulfate aerosols that reflect sunlight back into space,” and this has led to “cooling events following past eruptions, some of which have triggered major famines,” said Live Science. One study even found that melting polar ice is causing Earth’s rotation to slow.

Without intervention, the melting is going to continue. The “amount of ice lost by the end of the century will strongly depend on how much humanity continues to warm the planet by releasing carbon dioxide and other greenhouse gases,” the BBC said.