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Ocean Currents Are Getting Stronger, With Potentially Significant Implications For Climate Change
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Published 5 hours ago:
April 26, 2021 at 12:00 pm
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Scientists already know the oceans are rapidly warming and sea levels are rising. But that’s not all. Now, thanks to satellite observations, we have three decades’ worth of data on how the speeds of ocean surface currents are also changing over time.
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A new study is shedding light on just how much ice could be lost around Antarctica if the international community fails to urgently rein in planet-heating emissions, bolstering arguments for bolder climate policies.
The study, published Thursday in the journal
Geophysical Research Letters, found that over a third of the area of all Antarctic ice shelves including 67% of the area on the Antarctic Peninsula could be at risk of collapsing if global temperatures soar to 4°C above pre-industrial levels.
An ice shelf, as NASA explains, “is a thick, floating slab of ice that forms where a glacier or ice flows down a coastline.” They are found only in Antarctica, Greenland, Canada, and the Russian Arctic and play a key role in limiting sea level rise.
John Church
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For many coastal regions, sea-level rise is a looming crisis threatening our coastal society, livelihoods and coastal ecosystems. A new study, published in Nature Climate Change, has reported the world will lose almost half of its valuable sandy beaches by 2100 as the ocean moves landward with rising sea levels.
Sandy beaches comprise about a third of the world’s coastline. And Australia, with nearly 12,000 kilometres at risk, could be hit hard.
This is the first truly global study to attempt to quantify beach erosion. The results for the highest greenhouse gas emission scenario are alarming, but reducing emissions leads to lower rates of coastal erosion.
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