It was not "Global Warming" after all...

[Ravin R10 man]

~~Antarctic heat

Researchers have long known that volcanoes lurk under the ice of West Antarctica. This is a seismically active region, where East and West Antarctica are rifting apart. In 2013, a team of scientists even found a new volcano beneath the West Antarctic Ice Sheet.

West Antarctica is also hemorrhaging ice due to climate change, and recent studies have suggested there is no way to reverse the retreat of West Antarctic glaciers. However, the timing of this retreat is still in question, Schroeder said - it could take hundreds of years, or thousands. It's important to understand which, given that meltwater from the West Antarctic Ice Sheet contributes directly to sea level rise.

Scientists use computer models to try to predict the future of the ice sheet, but their lack of understanding of subglacial geothermal energy has been a glaring gap in these models. Measuring geothermal activity under the ice sheet is so difficult that researchers usually just enter one, uniform estimate for the contributions of geothermal heat to melting, Schroeder said.

Of course, volcanism isn't uniform. Geothermal hotspots no doubt influence melting more in some areas than in others.

"It's the most complex thermal environment you might imagine," study co-author Don Blankenship, a geophysicist at UT Austin, said in a statement. "And then, you plop the most critical dynamically unstable ice sheet on planet Earth in the middle of this thing, and then you try to model it. It's virtually impossible."

Hotspots melting

To unravel the complexity, the researchers built on a previous study they published in 2013 that mapped out the system of channels that flows beneath the Thwaites Glacier, a fast-flowing glacier that scientists say is vulnerable to global warming.

Using data from airborne radar, the researchers were able to figure out where these subglacial streams were too full to be explained by flow from upstream. The swollen streams revealed spots of unusually high melt, Schroeder said. Next, the researchers checked out the subglacial geology in the region and found that fast-melting spots were disproportionately clustered near confirmed West Antarctic volcanoes, suspected volcanoes or other presumed hotspots.

"There's a pattern of hotspots," Schroeder said. "One of them is next to Mount Takahe, which is a volcano that actually sticks out of the ice sheet."

The minimum average heat flow beneath Thwaites Glacier is 114 milliwatts per square meter (or per about 10 square feet) with some areas giving off 200 milliwatts per square meter or more, the researchers report today (June 9) in the journal Proceedings of the National Academy of Sciences. (A milliwatt is one-thousandth of a watt.) In comparison, Schroeder said, the average heat flow of the rest of the continents is 65 milliwatts per square meter.

"It's pretty hot by continental standards," he said.

The extra melt caused by subglacial volcanoes could lubricate the ice sheet from beneath, hastening its flow toward the sea, Schroeder said. To understand how much the volcanic melt contributes to this flow - and what that means for the future of the West Antarctic Ice Sheet - glaciologists and climate scientists will have to include the new, finer-grained findings in their models. Schroeder and his colleagues also plan to expand their study to other glaciers in the region.

"Anywhere in the West Antarctic Ice Sheet is going to be a candidate for high melt areas," he said. "And we have radar data covering much of it."

[wtnhunt]

Science and history prove that this planet in its history has gone through cyclic climate changes since its beginning. That goes back well before any of the talk of "global warming". So many alarmists were so quick to blame "global warming" on the current weather cycles. Amazes me that there were some bright scientists that actually fell for the hype and some still believe it.