Gustaf Hugelius on thawing permafrost
Gustaf Hugelius, Professor at the Department of Physical Geography and Vice Director of the Bolin Centre of Climate Research, gives a talk about the global carbon cycle, how thawing permafrost affects the global climate, ecosystems and Arctic peoples. https://www.youtube.com/watch?v=hO-6x7waPNY#Permafrost#Cryosphere
The permafrost is thawing, luring bacteria that will feast on these carbon-rich layers and produce two greenhouse gases, carbon dioxide and methane. How serious is this potential accelerator of climate change? It’s “De-Permafrosting” on Big Picture Science.
Predicting greenhouse gas fluxes to the atmosphere from thawing permafrost
"Abstract: Arctic permafrost is thawing at rapid rates, which threatens to expose large stores of soil organic carbon to microbial degradation" https://www.youtube.com/watch?v=d4tBmBbY5mg#Permafrost#Arctic#Cryosphere
It's been predicted for decades, but idiots didn't care. Arctic #permafrost is now melting so fast that it's releasing more #greenhouse gases than it sinks. Even if we limited #warming to 1.5, a metric we've already surpassed, this melting would continue.
L’Alaska subit de plein fouet le changement climatique. Avec la hausse des températures, le #pergélisol ( #permafrost ), ce sol gelé en permanence, se dégrade et les glissements de terrain se multiplient, menaçant des villages. Dans cette vidéo diffusée avec LeMonde.fr, rejoignez sur le terrain les scientifiques qui tentent de comprendre ce qu'il se trame sous terre.
Très beau reportage de ~9 min, très bien construit ! A mettre entre toutes les mains https://lejournal.cnrs.fr/videos/alaska-le-sol-se-derobe
Measurements from stations around the world show that #methane levels have increased significantly since the early 2000s.
According to the report, the main reason is that more methane has been released from wetland areas such as #bogs, shallow #wells , #ponds, and #lakes in tropical regions.
And as it gets warmer, more is released.
“The temperature change leads to increased microbiological activity,” researcher Stephen Matthew Platt says. He is one of the researchers behind the new study.
Processes like #decomposition in wetlands happen faster when it gets warmer.
Another reason for the increase in methane emissions is that #permafrost has begun to #thaw in the north.
“When the permafrost thaws, it also leads to more water on the surface, and this development is underway,” explains Platt.
quest to recover DNA millions of years old for the very first time
For decades, scientists have tried to unlock the secrets of ancient DNA.But life’s genetic blueprint is incredibly fragile, researchers have struggled to find DNA in fossils that could survive millions of years. Then, 1 maverick scientist had the controversial idea to look for DNA not in fossils or frozen ancient tissue – but in dirt
Permafrost thaw: a silent menace
"While permafrost cannot be directly observed from space, a lot of different types of satellite data, along with ground measurements and modelling, allow scientists to paint a picture of permafrost ground conditions." https://www.youtube.com/watch?v=Pz5Z7I7im9k#Permafrost
Why 2°C is Too High For The Cryosphere
Cryosphere Science & Global Climate Negotiations:A Joint Event with the Cryosphere Pavilion at COP28https://www.youtube.com/watch?v=crVBzcc2IUw #Cryosphere#PermaFrost#Oceans#Methane#SeaIce#Glaciers
Scientists Attempt to Explain Craters Exploding Out of the Earth
Sudden and violent explosions have been leaving behind massive #craters in the #permafrost of #Siberia — some nearly 70 feet wide and over 170 feet deep. The phenomenon has puzzled scientists since the first of these #explodingcraters were discovered back in 2012.
Just when you thought you had enough to worry about, the problem of melting #permafrost raises the issue of long-dormant viruses being released into the environment & then being spread by the increased use of previously frozen areas facilitated by the thaw....
If this sounds like the premise for a dystopian movie, then you're likely right, but if it turns out to be a real threat, then we be seeing some serious #health problems ahead.
"Streams in #Alaska are turning orange with iron and sulfuric acid.
Scientists who have studied these rusting rivers agree that the ultimate cause is climate change."
As the #Arctic warms, its waters are emitting carbon.
A recent study found that thawing #permafrost and carbon-rich runoff from Canada’s Mackenzie River trigger part of the Arctic Ocean to release more #CO2 than it absorbs.
Like many parts of the Arctic, the Mackenzie River and its delta have faced significantly warmer temperatures in recent years across all seasons, leading to more melting and thawing of waterways and landscapes.