Octopus DNA reveals West Antarctic Ice Sheet collapse 129,000 years ago
Climate change is causing Earth’s systems to warm, leading to significant changes in Antarctica, particularly in the loss of ice mass from the West Antarctic Ice Sheet (WAIS).
The findings in the latest study say that if the temperature goes up even a little, as expected in the most positive plans to fight climate change, it could lead to the collapse of WAIS and a rise in sea levels.
The WAIS has been losing ice at approximately 159 gigatons per year, contributing to rising global sea levels. There is uncertainty about the potential instability of the WAIS, and its collapse could result in a sea level rise of approximately 3.3 to 5 meters, causing human displacement and ecological losses in coastal areas.
Scientists looked at old evidence to see how Antarctica’s ice sheet behaved in the past when the Earth was warmer.
They used genetic information from an octopus to learn about the connection between different parts of Antarctica. They found signs supporting the idea that the ice sheet might have collapsed.
This is important because it helps us predict what might happen to sea levels in the future due to climate change.
Revelations from octopus DNA
The analysis of the octopus, Pareledone turqueti, and its genetic data suggests that the WAIS might have collapsed in the past when temperatures were just a bit warmer than they are now.
The study found that the octopus population experienced significant changes around certain periods, such as during glacial stages and interglacial periods.
These changes aligned with the collapse of the WAIS. The findings also suggest that the octopus population declined during the Last Interglacial period, around 129,000 to 116,000 years ago, when temperatures were slightly warmer than pre-industrial levels.
The octopus’s genetic history gives unexpected insights, suggesting that parts of Antarctica were connected in the past, and the whole ice sheet might have collapsed.
Understanding how the ice sheet acted in the past is crucial to figuring out what might happen to it now. This raises important questions about whether similar events could happen again with how the Earth’s temperature changes now.
Even a small temperature increase, as expected in plans to fight climate change, could make the ice sheet collapse. The study concluded that if the WAIS collapses, it could cause a big rise in sea levels, which would be bad for the planet.
The study shows that the tipping point for the WAIS might be in the range of the temperature targets set by the world to fight climate change.
The Paris Agreement stipulates limiting global temperature increase to below 2 degrees Celsius while pursuing efforts to limit the increase to 1.5 degrees.
Source: Interesting Engineering
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Octopus DNA reveals West Antarctic Ice Sheet collapse 129,000 years ago