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Rapid Melting of Glaciers Has Shifted Earth’s Axis, Study Reveals

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Since 1980, the planet’s north and south poles have moved roughly four meters in distance, and new research shows that shifts in the Earth’s rotational axis have accelerated since the 1990s as a result of the widespread melting of glaciers—a clear manifestation, scientists say, of the climate emergency.

“Faster ice melting under global warming was the most likely cause of the directional change of the polar drift in the 1990s,” Shanshan Deng—a researcher from the Institute of Geographic Sciences and Natural Resources Research at the Chinese Academy of Sciencestold the American Geophysical Union (AGU) Thursday.

In a study published last month in the peer-reviewed journal Geophysical Research Letter, Deng and her co-authors found that changes in terrestrial water storage—particularly the accelerated loss of water stored on land due to melting glaciers—redistributed enough of the world’s mass to drive “the rapid polar drift toward the east after the 1990s.”

As The Guardian explained Friday:

The planet’s geographic north and south poles are the point where its axis of rotation intersects the surface, but they are not fixed. Changes in how the Earth’s mass is distributed around the planet cause the axis, and therefore the poles, to move.

In the past, only natural factors such as ocean currents and the convection of hot rock in the deep Earth contributed to the drifting position of the poles. But the new research shows that since the 1990s, the loss of hundreds of billions of tons of ice a year into the oceans resulting from the climate crisis has caused the poles to move in new directions.

The scientists found the direction of polar drift shifted from southward to eastward in 1995 and that the average speed of drift from 1995 to 2020 was 17 times faster than from 1981 to 1995.

The AGU noted that “researchers have been able to determine the causes of polar drifts starting from 2002 based on data from the Gravity Recovery and Climate Experiment (GRACE), a joint mission by NASA and the German Aerospace Center, launched with twin satellites that year and a follow-up mission in 2018.”

Data from the GRACE satellites has enabled scientists to “link glacial melting to movements of the pole in 2005 and 2012, both following increases in ice losses,” The Guardian reported. “But Deng’s research breaks new ground by extending the link to before the satellite’s launch, showing human activities have been shifting the poles since the 1990s, almost three decades ago.”

While Deng’s team showed that the accelerated decline in water stored on land stemming from glacial losses “is the main driver” of polar drift since the 1990s, the researchers wrote that groundwater depletion in non-glacial regions has also contributed to the movements.

“Groundwater is stored under land but, once pumped up for drinking or agriculture, most eventually flows to sea, redistributing its weight around the world,” The Guardian noted. “In the past 50 years, humanity has removed 18 trillion tons of water from deep underground reservoirs without it being replaced.”

Vincent Humphrey, a climate scientist at the University of Zurich who was not involved in the study, told AGU that the new research “tells you how strong this mass change is—it’s so big that it can change the axis of the Earth.”

This shift in the Earth’s axis, however, is too small to affect daily life, Humphrey added. It could change the length of day, but only by milliseconds.

Nonetheless, other climate experts such as Jonathan Overpeck of the University of Arizona, have said before that the mere fact that the climate crisis is driving polar movements demonstrates “how real and profoundly large an impact humans are having on the planet.”

Republished from CommonDreams.org under Creative Commons

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Animals

Scientists Thrilled by Discovery of Rare, Mammoth 400-Year-Old Coral

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A massive 400-year-old hard coral discovered on the Great Barrier Reef has scientists expressing their sense of surprise and excitement.

Named Muga dambhi by the Manbarra people, the Indigenous group who have traditionally taken care of the land, the “exceptionally large” brown and cream-colored coral is located off the coast of Goolboodi or Orpheus Island in the Great Barrier Reef.

It is believed that the coral was spawned some 421 to 438 years ago, meaning that its age predates the arrival of Captain James Cook and the advent of colonization in Australia, notes the Guardian.

The spectacular coral is about 35 feet wide and over 17 feet high, and is double the size of the nearest coral.

Scientists and members of the community participating in a marine science course discovered the specimen earlier this year.

While not the largest coral in the world, the huge find is of major significance to the local ecosystem, according to Adam Smith, an adjunct professor at James Cook University who wrote the field note on the find.

“It’s like a block of apartments,” Smith said. “It attracts other species. There’s other corals, there’s fish, there’s other animals around that use it for shelter or for feeding, so it’s pretty important for them.”

“It’s a bit like finding a giant redwood tree in the middle of a botanic gardens,” he added.

It is likely that the coral hasn’t been discovered for such a long time due to its location in a relatively remote and unvisited portion of a Marine National Park zone that enjoys a high degree of protection.

“Over the last 20 or 30 years, no one has noticed, or observed, or thought it newsworthy enough to share photos, or document, or do research on this giant coral,” Smith said.

The coral is in remarkable condition, with over 70 percent of its surface covered in live coral, coral rock and microalgae. No disease, bleaching or recently deceased coral has been recorded on the specimen.

“The cumulative impact of almost 100 bleaching events and up to 80 major cyclones over a period of four centuries, plus declining nearshore water quality contextualise the high resilience of this Porites coral,” the field note added.

The specific coral has been given the name Muga dhambi, meaning big coral, out of respect for the Indigenous knowledge, language, and culture of the Manbarra Traditional Owners.

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Greenland Ice Washed Away as Summit Sees Rain for First Time in Recorded History

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For the first time in recorded history, torrential downpours of rain have struck Greenland’s icy summit nearly two miles above sea level.

Greenland, an environmentally sensitive island, is typically known for its majestic ice sheet and snowy climate, but this is fast changing due to a massive melt taking place this summer.

However, the typical snowfall has been replaced in recent years not simply by a few showers, but by heavy rainfall. The torrential downpour last week was so huge, in fact, that it washed away a terrifying amount of ice across some 337,000 square miles of the ice shelf’s surface, reports Earther.

Temperatures at the ice shelf had simultaneously warmed to a significant degree, with the summit reaching 33 degrees Fahrenheit – within a degree above freezing and the third time that the shelf has surpassed freezing temperatures this decade.

The fact that rain is falling on ice rather than snow is also significant because it is melting ice across much of southern Greenland, which already saw huge melting events last month, while hastening rising sea levels that threaten to submerge whole coastal cities and communities.

To make matters worse, any new ice formed by the freezing rainwater will not last long. The ice shelf currently existing on Greenland was formed by the compression of snow over innumerable years, which shines bright white and reflects sunlight away rather than absorbing it, as ice from frozen rain does.

The huge scale of the melt and accompanying rainfall illustrate the growing peril of rapidly warming climate conditions across the globe.

“This event by itself does not have a huge impact, but it’s indicative of the increasing extent, duration, and intensity of melting on Greenland,” wrote Ted Scambos, a senior research scientist at the National Snow and Ice Data Center at the University of Colorado. “Like the heat wave in the [U.S. Pacific] northwest, it’s something that’s hard to imagine without the influence of global climate change.”

“Greenland, like the rest of the world, is changing,” Scambos told the Washington Post. “We now see three melting events in a decade in Greenland — and before 1990, that happened about once every 150 years. And now rainfall: in an area where rain never fell.”

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South Korean Toilet Turns Poo Into Green Energy and Pays Its Users Digital Cash

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What if your morning #2 not only powered your stove to cook your eggs, but also allowed you to pay for your coffee and pastry on the way to class?

It seems like an absurd question, but one university in South Korea has invented a toilet that allows human excrement to not only be used for clean power, but also dumps a bit of digital currency into your wallet that can be exchanged for some fruit or cup noodles at the campus canteen, reports Reuters.

The BeeVi toilet – short for Bee-Vision – was designed by urban and environmental engineering professor Cho Jae-weon of the Ulsan National Institute of Science and Technology (UNIST), and is meant to not only save resources but also reward students for their feces.

The toilet is designed to first deliver your excrement into a special underground tank, reducing water use, before microorganisms break the waste down into methane, a clean source of energy that can power the numerous appliances that dorm life requires.

“If we think out of the box, feces has precious value to make energy and manure,” Cho explained. “I have put this value into ecological circulation.”

The toilet can transform approximately a pound of solid human waste – roughly the average amount people poop per day – into some 50 liters of methane gas, said Cho. That’s about enough to generate half a kilowatt hour of electricity, enough to transport a student throughout campus for some of their school day.

Cho has even devised a special virtual currency for the BeeVi toilet called Ggool, or honey in Korean. Users of the toilet can expect to earn 10 Ggool per day, covering some of the many expenses students rack up on campus every day.

Students have given the new system glowing reviews, and don’t even mind discussing their bodily functions at lunchtime – even expressing their hopes to use their fecal credits to purchase books.

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