Increase in volcanic eruptions at the end of the ice age caused by melting ice caps and erosion

February 1, 2016
Increase in volcanic eruptions at the end of the ice age caused by melting ice caps and erosion
3-D model simulation of a glaciation on the Villarrica Volcano (Chile). Credit: Pietro Sternai

The combination of erosion and melting ice caps led to a massive increase in volcanic activity at the end of the last ice age, according to new research. As the climate warmed, the ice caps melted, decreasing the pressure on the Earth's mantle, leading to an increase in both magma production and volcanic eruptions. The researchers, led by the University of Cambridge, have found that erosion also played a major role in the process, and may have contributed to an increase in atmospheric carbon dioxide levels.

"It's been established that melting and volcanic activity are linked - but what we've found is that erosion also plays a key role in the cycle," said Dr Pietro Sternai of Cambridge's Department of Earth Sciences, the paper's lead author, who is also a member of Caltech's Division of Geological and Planetary Science. "Previous attempts to model the huge increase in atmospheric CO2 at the end of the last failed to account for the role of erosion, meaning that CO2 levels may have been seriously underestimated."

Using numerical simulations, which modelled various different features such as ice caps and glacial erosion rates, Sternai and his colleagues from the University of Geneva and ETH Zurich found that erosion is just as important as in driving the increase in magma production and subsequent volcanic activity. The results are published in the journal Geophysical Research Letters.

Although the researchers caution not to draw too strong a link between anthropogenic (human-caused) climate change and increased volcanic activity as the timescales are very different, since we now live in a period where the ice caps are being melted by climate change, they say that the same mechanism will likely work at shorter timescales as well.

Over the past million years, the Earth has gone back and forth between ice ages, or glacial periods, and , with each period lasting for roughly 100,000 years. During the interglacial periods, such as the one we live in today, volcanic activity is much higher, as the lack of pressure provided by the ice caps means that volcanoes are freer to erupt. But in the transition from an ice age to an interglacial period, the rates of erosion also increase, especially in mountain ranges where volcanoes tend to cluster.

Glaciers are considered to be the most erosive force on Earth, and as they melt, the ground beneath is eroded by as much as ten centimetres per year, further decreasing the pressure on the volcano and increasing the likelihood of an eruption. A decrease in pressure enhances the production of magma at depth, since rocks held at lower pressure tend to melt at lower temperatures.

When volcanoes erupt, they release more into the atmosphere, creating a cycle that speeds up the warming process. Previous models that attempted to explain the increase in atmospheric CO2 during the end of the last ice age accounted for the role of deglaciation in increasing , but did not account for , meaning that CO2 levels may have been significantly underestimated.

A typical ice age lasting 100,000 years can be characterised into periods of advancing and retreating ice - the ice grows for 80,000 years, but it only takes 20,000 years for that ice to melt.

"There are several factors that contribute to climate warming and cooling trends, and many of them are related to the Earth's orbital parameters," said Sternai. "But we know that much faster warming that cooling can't be caused solely by changes in the Earth's orbit - it must be, at least to some extent, related to something within the Earth system itself. Erosion, by contributing to unload the Earth's surface and enhance volcanic CO2 emissions, may be the missing factor required to explain such persistent climate asymmetry."

Explore further: Activity on seafloor linked to icy ebb and flow on surface

More information: Pietro Sternai et al. Deglaciation and glacial erosion: a joint control on magma productivity by continental unloading, Geophysical Research Letters (2016). DOI: 10.1002/2015GL067285

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cjones1
1 / 5 (1) Feb 01, 2016
I don't believe the particulate matter from volcanic activity is factored proportionally in regards to ice and glacial melt. In modern times, the effects of Carbon black soot from industrialization may contribute to melting of polar and glacial ice provided the winds transport it there. I don't know if examination of loess deposits can provide further information of the past on this area.
24volts
1 / 5 (4) Feb 01, 2016
"since we now live in a period where the ice caps are being melted by climate change" That is the biggest crock of horse crap I've read in a while on here. We are speeding up the climate change; I will agree on that but we are NOT the main cause of it. The Earth has been cycling back and forth between ice ages and no ice ages for millions of years and possibly a couple of billion years. We are just roughly in the middle of a cycle. It's going to eventually get cold again and ice up again unless mankind figures out how to control weather. It's just going to take a long time and we will probably have killed ourselves off by then anyway. Maybe the cockroaches in charge then will see the next ice age.

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