Scientists issue warning after making troubling discovery in waters off Antarctica: 'Could be more unstable'
A recent discovery by a team of Australian scientists reveals that an ocean current, which acts as a safeguard by protecting Antarctica from warm water that would otherwise melt the region's ice, is at risk of failing.
Relatively little is known about the Antarctic Slope Current (ASC), but scientists do understand its importance in acting as Antarctica's last line of defense from preventing warm water from invading the region. New research that was recently published in Geophysical Research Letters looks at how this current, which acts as a vital barrier, "will respond to changes in wind, heating, and meltwater under climate change."
"We found meltwater from Antarctica is speeding up the current, known as the Antarctic Slope Current," the authors of the study wrote in an article for the Conversation, per Phys.org. "And it's set to become even faster by mid-century."
"A faster current could be more unstable," added the researchers. "This means eddies of warm water could eat away at Antarctica's ice, posing a major concern for the stability of Earth's climate system."
The team of scientists warned that "humanity must act now" to protect this natural buffer, which is helping to keep Antarctica's ice shelves from vanishing.
The study's authors point out that in vulnerable low-lying coastal regions, even a minimal sea-level rise of just a few centimeters can double the likelihood of flooding events. Rising sea levels allow saltwater to encroach further inland, contaminating freshwater supplies and impacting crop yields.
The Union of Concerned Scientists has linked human activity to rising global temperatures that are melting ice sheets and releasing vast volumes of freshwater into the North Atlantic. This invasion of freshwater is disturbing the delicate balance of ocean circulation patterns and contributing to rising sea levels as the relatively less salty and less dense water takes up more space.
A study published in May showed that the Northeastern U.S. experienced up to eight days of flooding annually because of the disruption of the Atlantic Meridional Overturning Circulation. The research concluded that up to 50% of the total flooding events at monitored sites in the Northeast might be tied directly to the weakening circulation.
Rising sea levels in Charleston, South Carolina, are making what used to be an occasional nuisance for the coastal city into a more routine disruption for the community, as rising tides bring water into homes and businesses.
"Humanity must act fast to preserve the current, by cutting carbon emissions," warned the authors of the study on the changes to the ASC. "When it comes to Antarctica, this action isn't optional—it's the only way to hold the line."
Transitioning from dirty energy sources to clean, renewable options is the most effective way to cut carbon pollution that is overheating our planet. Even relatively small changes we can make in our homes can help. Washing clothes in cold water, upgrading to LED bulbs, and unplugging "energy vampires" can have an impact and make a difference.
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