According to a recently released NASA study, mantle plumes that reach up from the Earth’s mantle spread out under the crust of Antarctica’s Marie Byrd Land.
These sources, however, are unclear on establishing a timeline for such a rise in ocean levels.
Discover Magazine reports:
Dozens of feet of sea level rise could take millennia, but the latest estimates suggest as much as 8 feet by the end of the century on the extreme end of projections. That timeline is still one of the biggest unknowns.
Should we start considering how geothermal activity might be affecting ice sheets?
A new NASA study adds evidence that a geothermal heat source called a mantle plume lies deep below Antarctica’s Marie Byrd Land, explaining some of the melting that creates lakes and rivers under the ice sheet. Although the heat source isn’t a new or increasing threat to the West Antarctic ice sheet, it may help explain why the ice sheet collapsed rapidly in an earlier era of rapid climate change, and why it is so unstable today.
The stability of an ice sheet is closely related to how much water lubricates it from below, allowing glaciers to slide more easily. Understanding the sources and future of the meltwater under West Antarctica is important for estimating the rate at which ice may be lost to the ocean in the future.
Antarctica’s bedrock is laced with rivers and lakes, the largest of which is the size of Lake Erie. Many lakes fill and drain rapidly, forcing the ice surface thousands of feet above them to rise and fall by as much as 20 feet (6 meters). The motion allows scientists to estimate where and how much water must exist at the base […]
They found that the flux of energy from the mantle plume must be no more than 150 milliwatts per square meter. For comparison, in U.S. regions with no volcanic activity, the heat flux from Earth’s mantle is 40 to 60 milliwatts. Under Yellowstone National Park — a well-known geothermal hot spot — the heat from below is about 200 milliwatts per square meter averaged over the entire park, though individual geothermal features such as geysers are much hotter.
We now know that the area is much more active with geothermal heat than previously thought.
And previous studies have shown that this activity isn’t evenly distributed throughout a large area, but highly concentrated in some places over others.
If climate alarmists want to continue promoting the notion that global warming is responsible for western Antarctic ice sheets melting, they will need to explain why “magma migration and volcanism” isn’t affecting Antarctic ice.
The Daily Caller reports:
A 2014 University of Texas study found western Antarctica was a literal hotbed for geothermal heat. Researchers concluded that “large areas at the base of Thwaites Glacier are actively melting in response to geothermal flux consistent with rift-associated magma migration and volcanism.”
The following year, another team of U.S. scientists found there’s a huge amount of geothermal heat under western antarctica. “The high geothermal heat flux may help to explain why ice streams and subglacial lakes are so abundant and dynamic in this region,” the study found.
Earlier this year, Scottish researchers found 91 previously unidentified volcanoes under the Antarctic ice sheet, including one that’s some 13,000 feet tall.
If one of these volcanoes were to erupt it could further destabilise west Antarctica’s ice sheets,” Robert Bingham,a study co-author, told The Guardian. “Anything that causes the melting of ice – which an eruption certainly would – is likely to speed up the flow of ice into the sea.
“The big question is: how active are these volcanoes? That is something we need to determine as quickly as possible,” Bingham said.
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