Summary
Highlights
In 2014, a helicopter crew discovered a massive crater in Siberia, over 80 feet wide and deeper than a 15-story building. This was no ordinary sinkhole, as debris was spread far outside, suggesting an explosion. Scientists found unusually high levels of methane, leading them to believe it was a 'methane bomb.' More craters have since been discovered, appearing during periods of unusually warm weather, raising concerns about a connection to climate change.
In 2017, scientists in Alaska investigated Esieh Lake, where a local pilot reported unusual bubbling. The team found it was belching over ten tons of methane daily, making it the highest flux methane seep discovered in the Arctic. Sonar scans revealed a 50-foot deep hole at the source of the bubbles. Both the Siberian craters and Esieh Lake are located on permafrost, a layer of frozen earth spanning a quarter of the Northern Hemisphere, which is now thawing rapidly.
Alaska's 'drunken forests' and rapidly slumping landscapes near Fox, Alaska, demonstrate the dramatic and rapid changes occurring due to thawing permafrost. These changes also impact human settlements like Utqiagvik, where ice cellars are warming and coastlines are eroding, threatening traditional ways of life. Scientists predict that 30% to 70% of near-surface permafrost in the Arctic will be lost in the coming decades, with significant global implications.
The Fox permafrost tunnel reveals vast quantities of organic matter, including ancient plants and animal remains like mammoth bones, with their carbon frozen in time. As permafrost thaws, microbes decompose this organic matter, releasing carbon dioxide and methane, powerful greenhouse gases. While methane lasts 12 years in the atmosphere, it is 30 times more potent than carbon dioxide. These permafrost emissions are not fully accounted for in current climate models, underestimating the carbon budget needed to meet global warming targets.
Katey Walter Anthony demonstrates methane escaping from a lake, highlighting a positive feedback cycle: methane release thaws more permafrost, generating more methane and warming. The methane in Esieh Lake contains a chemical fingerprint indicating it originates from deeper fossil methane reservoirs, millions of years old. VLF technology revealed a 'thaw chimney' extending deep into the permafrost, providing a pathway for this fossil methane to reach the surface. This raises concerns that even a small fraction of the Arctic's 1.3 trillion tons of stored methane could significantly intensify global warming.
The Batagaika megaslump in Northeast Siberia illustrates how a small human impact can trigger a devastating feedback cycle in permafrost. Scientists are investigating whether the permafrost thaw could reach an irreversible tipping point, as seen with melting ice wedges forming lakes. Arctic communities are adapting to these changes: Utqiagvik faces sinking roads and homes, with portable sled-base homes being explored as a solution. The widespread changes in the Arctic underscore the urgent need to reduce human emissions and better understand our climate future.