Deep ocean currents in Antarctica are slowing earlier than predicted
1 year, 6 months ago

Deep ocean currents in Antarctica are slowing earlier than predicted

The Hindu  

Antarctica sets the stage for the world’s greatest waterfall. This Antarctic “bottom water” then spreads north along the sea floor in deep ocean currents, before slowly rising, thousands of kilometres away. Our new research, published in the journal Nature Climate Change, uses real-world observations to decipher how and why the deep ocean around Antarctica has changed over the past three decades. Reductions in the amount of Antarctic bottom water reaching the ocean floor also increases sea levels because the warmer water that replaces it takes up more space. We developed a new approach that combines ship data, mooring records, and a high resolution numerical simulation to calculate the strength of Antarctic bottom water flow and how much oxygen it transports to the deep ocean.

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History of this topic

Scientists studying Antarctic Circumpolar Current to take closer look at 'heat flux gates' letting in warmer water
1 year, 1 month ago

Scientists studying Antarctic Circumpolar Current to take closer look at 'heat flux gates' letting in warmer water

ABC  

In short: The Antarctic Circumpolar Current surrounds Antarctica like a force field, keeping out warmer waters, but scientists are worried about breaches. "The Antarctic Circumpolar Current flows around the icy continent from west to east and acts as our safety belt so that the warm water doesn't reach the Antarctic and melt the ice," the CSIRO's Benoit Legresy explained. "If …

Ocean currents vital for distributing heat could collapse by midcentury, study says
1 year, 4 months ago

Ocean currents vital for distributing heat could collapse by midcentury, study says

Associated Press  

A system of ocean currents that transports heat northward across the North Atlantic could collapse by mid-century, according to a new study, and scientists have said before that such a collapse could cause catastrophic sea-level rise and extreme weather across the globe. “There are large uncertainties in this study, in many prior studies, and in climate impact assessment overall, and …

Melting Antarctic ice may strangle vital ocean currents
1 year, 8 months ago

Melting Antarctic ice may strangle vital ocean currents

Salon  

As Antarctic ice melts, all of that fresh water pours into the ocean, essentially diluting it by reducing its salinity. It found that the world is on the verge of a potentially catastrophic slowdown, which could have a devastating effect on climate change, marine ecosystems, and the stability of Antarctic ice. "Our modeling shows that if global carbon emissions continue …

Rapidly melting Antarctic ice could affect oceans ‘for centuries’
1 year, 8 months ago

Rapidly melting Antarctic ice could affect oceans ‘for centuries’

Al Jazeera  

Scientists warn deep ocean water flows from the Antarctic could decline by 40 percent by 2050, threatening the collapse of circulation crucial for planetary systems. Rapidly melting Antarctic ice is dramatically slowing down the flow of water through the world’s oceans and could have a disastrous effect on global climate, the marine food chain, and even the stability of ice …

Melting Antarctic ice will slow down a major global deep ocean current by 40% by 2050
1 year, 8 months ago

Melting Antarctic ice will slow down a major global deep ocean current by 40% by 2050

Daily Mail  

Melting ice around Antarctica will spark a rapid slowdown of a major global deep ocean current by 2050 that could have devastating impacts on ocean health and the marine food web. Warning: Melting ice around Antarctica will spark a slowdown of a major global deep ocean current by 2050 that could have devastating impacts on ocean health and marine life …

Antarctic sea ice reaches second lowest level in 44 YEARS
2 years, 8 months ago

Antarctic sea ice reaches second lowest level in 44 YEARS

Daily Mail  

Antarctic sea ice has reached its second lowest level in almost half a century, new satellite data reveals, as scientists warn that the melting of the West Antarctic Ice Sheet could cause global sea levels to rise by up to 10 feet. Scientists have revealed the first evidence that rising greenhouse gases have a long-term warming effect on the Amundsen …

Concern grows over Atlantic Ocean ‘conveyor belt’ shutdown
3 years, 1 month ago

Concern grows over Atlantic Ocean ‘conveyor belt’ shutdown

Al Jazeera  

Effects of climate change are slowing a key ocean circulation system with immense consequences for Earth’s climate if it collapses. But the effects of anthropogenic climate change have diminished the flow of this vast conveyor belt system, known as the Atlantic Meridional Overturning Circulation, and recent scientific research suggests it may even be headed for collapse. “Whether it’s just linear, …

Ocean currents are slowing down due to climate change
3 years, 9 months ago

Ocean currents are slowing down due to climate change

CNN  

CNN — Remember the movie, “The Day After Tomorrow,” in which a catastrophic series of global disasters strike after climate change causes the world’s ocean currents to stop? “Both surface warming and the increased water cycle, increased rainfall and the ice melt are all a consequence of global warming” across parts of the North Atlantic Ocean, he said. An increase …

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