What happens when the Arctic permafrost melts? - Brendan Rogers and Jessica Howard

TL;DR

Ancient animal and plant remains preserved in Arctic permafrost are offering scientists a unique glimpse into the past, but rapid thawing due to climate change poses a threat to these invaluable treasures.

Transcript

In June 2022, a gold miner in the Canadian Yukon made a remarkable discovery. While working on the traditional lands of the Tr’ondëk Hwëch’in First Nation, he uncovered the exceptionally well-preserved frozen remains of a woolly mammoth calf that died 30,000 years ago. But this find isn’t the only of its kind because the Arctic holds many burie... Read More

Key Insights

• 🌱 The Arctic permafrost contains a wealth of well-preserved animal and plant remains, providing invaluable insights into past ecosystems and genetic history.
• 👶 An increasing number of discoveries, including new species and ancient DNA, are challenging previous understandings of extinct animals and early human history.
• 🫢 Climate change and rapid thawing of permafrost put these valuable remains at risk and contribute to the release of large amounts of greenhouse gases, exacerbating global warming.
• 😀 Indigenous and First Nations communities in the Arctic face challenging decisions as they seek to protect their homes, cultures, and traditional ways of life from the impacts of thawing permafrost.

Questions & Answers

Q: What has been the most significant discovery made in Arctic permafrost?

One of the most remarkable discoveries is the perfectly preserved woolly mammoth calf, which died 30,000 years ago. Other discoveries include a 57,000-year-old wolf pup and a new species of mammoth identified using DNA from 1.6-million-year-old teeth.

Q: How does permafrost preserve organic remains so well?

Permafrost acts as a natural freezer and draws moisture away from remains, preventing decomposition. Microorganisms that decompose tissues operate at slower rates in subfreezing temperatures, further aiding preservation.

Q: Why is permafrost thawing at an alarming rate?

Climate change is causing rapid warming in the Arctic at a rate 3 to 4 times faster than the global average. Extreme weather events and wildfires are burning vegetation that helps keep permafrost cool, contributing to its thawing.

Q: What are the potential consequences of permafrost thawing?

Thawing permafrost can lead to ground collapse, flooding, erosion, and landslides, posing a threat to infrastructure and communities. Indigenous and First Nations people in the Arctic are particularly vulnerable to the impacts.

Summary & Key Takeaways

• The Arctic permafrost, covering 15% of the Northern Hemisphere, contains exceptionally well-preserved remains of animals and plants that have been frozen for thousands of years.

• Permafrost acts as a natural freezer, drawing moisture away from buried remains and slowing down decomposition processes, enabling scientists to study ancient DNA and reconstruct the past.

• However, rapid thawing caused by climate change is endangering these ancient treasures and the people who depend on the Arctic region, while also releasing vast amounts of greenhouse gases into the atmosphere.