Scientists say the world's permafrost is getting warmer, with temperatures increasing by an average of 0.3 degrees Celsius (0.54 Fahrenheit) over a decade.
A study published Wednesday found the biggest rise in Siberia, where frozen soil temperatures rose by 0.9 degrees Celsius (1.62 Fahrenheit) between 2007 and 2016.
Researchers working on the Global Terrestrial Network for Permafrost collected usable data for the entire period from 123 boreholes in the Arctic, Antarctic and high mountain ranges of Europe and Central Asia.
Researchers working on the Global Terrestrial Network for Permafrost collected usable data for the entire period from 123 boreholes in the Arctic, Antarctic and high mountain ranges of Europe and Central Asia. Pictured, Lake and ponds at the foothills of the Brooks Range, Alaska that were studied.
The temperature rose at 71 sites, sank at 12 and remained unchanged at 40.
Scientists say the increases track global warming generally.
They noted that thawing permafrost - already recorded at five of the sites - contains organic matter that can release greenhouse gases, further stoking climate change.
'All this data tells us that the permafrost isn't simply warming on a local and regional scale, but worldwide and at virtually the same pace as climate warming, which is producing a substantial warming of the air and increased snow thickness, especially in the Arctic,' said Prof. Guido Grosse, Head of the Permafrost Research Section at the Alfred Wegener Institute in Potsdam.
These two factors in turn produce a warming of the once permanently frozen ground.'
According to Prof. Hanne H. Christiansen, co-author of the study and President of the International Permafrost Association (IPA), 'The permafrost temperature is one of the most universally accepted climate variables.
The drainage channel of a freshly drained basin near Cape Halkett. The lake drained catastrophically 40 days ago, researchers said
Aerial views of the Russian tundra in the Lena delta. The images were taken during a methane measurement flight with HELIPOD and a helicopter.
'It offers a direct insight into how the frozen ground is reacting to climate change,' the researcher explains.
'This information is above all essential in those permafrost regions where the soil has already grown warmer or begun thawing, producing major damage when the ground buckles, destabilising roads and buildings.'
Permafrost is soil that has been frozen for at least two years.
As a result of this prolonged cryogenic state, the land stores large amounts of carbon and other nutrients from organic matter.
Picture of the spring flood of the Lena at the Siberian permafrost island Samoylov. The river carries thick ice floes towards the Arctic Ocean every spring.
AWI permafrost experts investigate the eroding coast on the Siberian island of Sobo-Sise in the eastern Lena Delta.
It represents a 'large carbon reservoir', according to the scientists, which is slowly released into the atmosphere as the permafrost thaws.
Previous research into the make-up of the world's permafrost suggests it contains more than 1,000 billion tonnes of carbon.
Image from the Lena spring flood at Samoylov. Once a year the river carries massive amounts of ice towards the Arctic Ocean. The floats often get stucked at the shoreline and build big icy dams.
About 24 percent of the land in the Northern Hemisphere is covered in permafrost.
As frozen ground thaws, it may collapse to form bogs or fens whose resident microbes can degrade the formerly frozen soil carbon, as well as new carbon from plant growth.
Knowing how the activities of these microbes contribute to carbon dioxide and methane in the atmosphere has been challenging.
A Nenets family in the city of Nadym, in northern Siberia, Yamal-Nenets Region, 2500 km (about 1553 miles) northeast of Moscow, Russia.
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https://hienalouca.com/2019/01/16/worlds-permafrost-gets-warmer-siberia-rises-the-most/
Main photo article Scientists say the world’s permafrost is getting warmer, with temperatures increasing by an average of 0.3 degrees Celsius (0.54 Fahrenheit) over a decade.
A study published Wednesday found the biggest rise in Siberia, where frozen soil temperatures rose by 0.9 degrees Celsius (1.62...
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Dianne Reeves US News HienaLouca
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