How do Arctic wildfires affect permafrost? Our new study finds no consistent pattern in lake size changes but increased variability in burned areas.
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#permafrost
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Greg Cocks Kinematic Evolution Of A Large Paraglacial Landslide In The Barry Arm Fjord Of Alaska
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https://doi.org/10.1029/2023JF007119 <-- shared paper
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https://doi.org/10.5066/P9EUCGJQ <-- shared technical article
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https://www.sciencebase.gov/catalogMaps/mapping/ows/5fff561ed34e592d8671ee85?service=wms&request=getcapabilities&version=1.3.0 <-- shared web mapping service
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#GIS #spatial #mapping #massmovement #landslide #engineeringgeology #remotesensing #sitespecific #LiDAR #iFSAR #paraglacial #kinematics #mapping #monitoring #spatialanalysis #spatiotemporal #fedscience #risk #hazard #glacier #retreat #climatechange #Alaska #BarryArm #fjord #hazardassessment #tsunami #wave #BarryGlacier #change #sensors #fieldwork #surveillance #melting #permafrost #Whittier #geophysics #geology #Alaska #geomorphometry #deglaciating
@USGS
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#Arctic #warming could pose a threat to America’s #security too: #Alaska may have new vulnerabilities to both #China & #Russia; changes in #ocean salinity & temp might interfere w/ #submarine detection systems; extremes of climate change, including #permafrost thaw in Russia, may drive #economic #instability, social #unrest, & territorial claims. [#Trump #Intelligence Agencies excluded #ClimateChange from the annual #ThreatAssessment report for the first time in decades — too *woke*]
Rückkopplungen im #Kohlenstoffkreislauf – etwa durch tauenden #Permafrost – könnten selbst bei moderaten #Emissionen eine stärkere #Erderhitzung verursachen als bisher gedacht.
Eine Studie des #PIK betont, dass das 2-Grad-Ziel nur bei sehr niedrigen Emissionen und geringer #Klimasensitivität erreichbar bleibt. Langfristige Modelle machen deutlich, dass heutige Entscheidungen über Jahrhunderte wirken.
Potsdam Institute for Climate Impact ResearchStärkere Erderhitzung durch Rückkopplungen im Klima- und Kohlenstoff-Kreislauf möglich24.03.2025 - Die Erderhitzung könnte in den nächsten tausend Jahren stärker ausfallen als bisher angenommen – das zeigt eine neue Studie des Potsdam-Instituts für Klimafolgenforschung (PIK). Demnach ist das Ziel des Pariser Abkommens, den Temperaturanstieg deutlich unter 2 Grad Celsius zu halten, nur erreichbar in Szenarien mit sehr niedrigen Emissionen und bei einer geringeren Klimasensitivität als derzeit in der besten Schätzung angenommen. Die Studie ist die erste, die langfristige Klimaprojektionen über 1.000 Jahre erstellt und dabei alle derzeit bekannten wichtigen Rückkopplungen im Kohlenstoffkreislauf – einschließlich Methan – berücksichtigt.
Even 'safe' #climate scenarios may overshoot 2°C warming: New PIK study shows feedback loops like #permafrost thaw could amplify global heating throughout this millennium. Paris agreement only possible with very low emissions + low climate sensitivity.
https://www.pik-potsdam.de/en/news/latest-news/amplified-global-heating-risk-due-to-climate-and-carbon-cycle-feedbacks
"El permafrost acumula el doble de carbono que la atmósfera, pero el grado al cual el carbono congelado se derretirá y acelerará el cambio climático sigue siendo un punto de investigación científica."
Eos · Los lagos y estanques de Alaska revelan los efectos del derretimiento del permafrost
Das rasante Abschmelzen von #Gletschern gefährdet laut #UN die #Nahrungsversorgung und #Wasserversorgung von bis zu 2 Milliarden Menschen weltweit.
Besonders betroffen sind #Gebirgsregionen, deren #Landwirtschaft stark von #Schneeschmelze und #Gletscherwasser abhängt.
Die #Erderwärmung führt zu #Dürren, #Überflutungen und dem tauen von #Permafrost.
The Guardian · Glacier meltdown risks food and water supply of 2 billion people, says UN
#ClimateChange #glaciers #permafrost
"Earth’s frozen places — ice sheets, glaciers and permafrost — are melting: a clear sign of climate change and a planet quickly exiting the stable state that gave rise to human civilization. This great thaw is having far-reaching consequences for communities and individuals across the globe — from polar and mountainous regions to coastal areas."
Mongabay Environmental News · With climate change, cryosphere melt scales up as a threat to planetary healthEarth’s frozen places — ice sheets, glaciers and permafrost — are melting: a clear sign of climate change and a planet quickly exiting the stable state that gave rise to human civilization. This great thaw is having far-reaching consequences for communities and individuals across the globe — from polar and mountainous regions to coastal areas. […]
Wie bedroht die globale Erwärmung das arktische #Meereis? Wird das #Nordpolarmeer im Sommer bald eisfrei sein? Etwas #Einsteigerwissen zur #Arktis und den dortigen Veränderungen durch den #Klimawandel. 
#Meereis #Erderwärmung #Umweltschutz #Eisschmelze #NASA #Klimaforschung #Permafrost #Treibhausgase
www.oekologisch-unterwegs.deKlimawandel: Arktisches Meereis: Die Globale Erwärmung bedroht die Arktis
More from 
Tino Eberl
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Bio:
Climate scientist at #DMI.
Coordinator of PolarPortal (lots of up-to-date Arctic data) and ROPEWALK (huge Danish logbook digitization project together with @rigsarkivet).
#ClimateChange in the Arctic, in particular #Greenland and in Africa, in particular #Tanzania.
Modelling subsea #permafrost.
Conveying science to the public: #IKFF #IKlimaforskernesFodspor #BestilEnForsker
with dual citizenship 
and 
and (occasionally) tooting in three languages.
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La fonte du #permafrost présente-t-elle un #risque sanitaire ?
permafrost = #pergelisol = sols dont la #temperature est < 0° C pendant > 2 ans, leur permettant de fait d'être impérméables.
1/2
La surface de la #Terre en est recouverte à près de 20%.
-> bouleversement/réchauffement climatique de certaines régions du globe -> fonte du permafrost = libération des micro-organismes jusque-là emprisonnés dans la #glace.
2016 en #Siberie : https://mastodon.social/@cobrate/113618472496022727
Mastodoncob (@cobrate@mastodon.social)Attached: 1 image
2016 (1/4) :
- Donald Trump élu Psdt USA avec Steve Bannon propagande/piratage Poutine (usine trolls) + déplace l'ambassade des États-Unis à Jérusalem + se retire de l'accord #nucleaire iranien + accord pour ventes d’armes pour des milliards de $ à l’Arabie saoudite + falsification comptes campagne. Paul Manafort directeur de campagne transmission infos Konstantin Kilimnik, services renseignement Russe + https://mastodon.social/@cobrate/113658839552783433
Suite : https://mastodon.social/@cobrate/113697676912243532
#climat #climate
Eine Aufteilung von Projekten auf zwei oder mehrere "Teilprojekte" scheint die neue Masche zu sein um die notwendige #UVP (#Umweltverträglichkeitsprüfung) ganz oder zumindest teilweise zu erfüllen. Das scheint bei der #TIWAG immer öfter vorkommen.
Auftauender #Permafrost, Rückzug von Gletschern und immer instabilere Berghänge dank #Klimakrise bringt immer öfter Probleme oder Gefahren. #Stauseen im hochalpinen Gelände sind davon besonders betroffen.
Zu den Gefahren wird es womöglich zu einer Gutachterschlacht kommen.
Die Wasserableitung aus dem #Ötztal ist offenbar nach wie vor fix eingeplant. Das werden sie allerdings nie bekommen. Nie!
"Flutwelle ins #Kaunertal als Klima-Worst-Case"
https://tirol.orf.at/stories/3296414/
ORF.at · Kraftwerk Kaunertal: Flutwelle ins Kaunertal als Klima-Worst-Case
‘The land is tearing itself apart’: life on a collapsing #Arctic isle
On #Qikiqtaruk, off Canada, researchers at the frontier of #ClimateChange are seeing its rich ecology slide into the sea as #MeltingPermafrost ice leaves little behind
“It’s one thing to think about what the changes mean to us, but I can’t imagine the fear and stress the animals feel as everything changes so fast. We’re supposed to be the guardians of the land. But we’ve let them down.” - Richard Gordon.
By Leyland Cecco, on Herschel Island–Qikiqtaruk
November 21, 2024
"Armed with a fleet of drones and working closely with Indigenous Inuvialuit rangers, the team has revealed a rapid reshaping of the tundra with little precedent. As they race to understand what those changes might mean, a combination of rising seas, landslides and flooding mean the landscape is literally collapsing around them, making it harder to study an island that reflects the tumultuous future of the western Arctic."
The Guardian · ‘The land is tearing itself apart’: life on a collapsing Arctic isle
Thawing #Arctic #permafrost could release radioactive, #cancer-causing #radon
As permafrost melts as a result of climate change, it may release more radon, a colorless, odorless gas linked with lung cancer.
By Stephanie Pappas
published February 23, 2024
"Thawing permafrost in the Arctic could release radon, a radioactive gas that has the potential to cause cancer, scientists have warned.
"The permafrost that keeps the ground frozen year-round in the Arctic acts like a cap that prevents a variety of gases from bubbling up into the atmosphere. The most famous of these is probably #methane, a potent greenhouse gas that is released as the permafrost thaws, thereby accelerating #ClimateChange.
"But in a new paper, published in the March issue of the journal #EarthScience Reviews, researchers note that there's another dangerous gas lurking under the Arctic permafrost: radon. This colorless, odorless gas is a step in the radioactive decay of naturally occurring uranium. It's known for sometimes accumulating inside homes, especially basements, thus raising the long-term risk of lung cancer for residents.
"According to the Environmental Protection Agency [#EPA], radon is the second-leading cause of lung cancer in the United States, responsible for 21,000 deaths a year.
"Right now, radon is not always a pressing problem in the Arctic or near-Arctic regions, where the ground remains frozen year-round. That's because permafrost keeps the gas from rising out of the soil, Paul Goodfellow, an environmental program specialist in geologic hazards at the Alaska Division of Geological & Geophysical Surveys, told Live Science. But as the permafrost melts, this protective shield disappears."
Live Science · Thawing Arctic permafrost could release radioactive, cancer-causing radon
Gateway to the #underworld: The enormous #permafrost '#megaslump' in #Siberia that keeps getting bigger
The growing "gateway to the underworld," officially known as the #BatagayMegaslump, is the largest megaslump in the world and exposes permafrost layers that are 650,000 years old.
By Sascha Pare
published September 13, 2024
"The 'gateway to the underworld' is a colossal, expanding crater in Siberia's permafrost. It is officially called the #Batagay (also spelled #Batagaika) crater or megaslump and formed when a portion of hillside in the #YanaUplands collapsed in the 1970s.
"However, the crater wasn't discovered until 1991, when satellite images revealed a rounded cliff face towering over a huge depression in the frigid landscape.
"The Batagay crater is the largest megaslump in the world, measuring 3,250 feet (990 meters) wide as of 2023. The cliff face at the top of the formation, or headwall, stands 180 feet (55 m) high.
"When it opened, the gateway exposed layers of permafrost that had been frozen for up to 650,000 years — the oldest permafrost in Siberia and the second-oldest in the world, after relict ground ice in #Canada's #YukonTerritory that is about 740,000 years old. Recently, researchers found that the gateway is expanding annually by about 35 million cubic feet (1 million cubic meters), with the depression sinking further into the ground and exposing new layers of ancient permafrost.
"The headwall of the gateway is also retreating at a rate of 40 feet (12 m) per year due to permafrost thaw, discharging massive amounts of ice and sediment into the crater, according to a 2024 study. Some of this melt material may remain in the crater, but #sediment and ice also washes into the #BatagayRiver valley at the far end of the gateway, researchers noted in the study.
"The permafrost in this region is 80% ice, which is likely why the hillside slumped in the first place, Thomas Opel, a paleoclimatologist at the Alfred Wegener Institute in Germany who has studied the gateway to the underworld, previously told Live Science.
"The gateway sits in a landscape of larch and birch #woodlands that became the target of #deforestation from the 1940s onward. Deforestation caused the #topsoil to rapidly erode and expose the underlying permafrost, which — due to its icy composition — melted more quickly than if it had been richer in sediments. Significant melting during the following decades caused the hillside to disintegrate and collapse, Opel said."
Live Science · Gateway to the underworld: The enormous permafrost 'megaslump' in Siberia that keeps getting bigger
#Siberia's 'gateway to the #underworld' is growing a staggering amount each year
The #BatagayMegaslump — a 3,250-foot-wide (990 meters) depression in the #permafrost in the Russian Far East — is "actively growing" by a massive amount every year, scientists have found.
By Sascha Pare
published May 6, 2024
"'Rapid permafrost thaw features are widespread and observed to increase in #Arctic and #SubArctic ice-rich permafrost terrain,' the research team wrote in a study, published online March 31 in the journal Geomorphology. However, the amount of ice and sediment lost from the Batagay megaslump is 'exceptionally high' due to the sheer size of the depression, which stretched 3,250 feet (990 m) wide as of 2023."
Live Science · Siberia's 'gateway to the underworld' is growing a staggering amount each year
#Greenland is getting greener. That could have huge consequences for the world
By Angela Dewan, CNN
Published February 13, 2024
"Warmer air temperatures have driven #IceLoss, which has in turn raised land temperatures. That has caused the melting of #permafrost, a frozen layer just beneath the Earth’s surface and found in much of the #Arctic, and that melt releases planet-warming #CarbonDioxide and #methane, contributing to more #GlobalWarming. #PermafrostMelt is also causing #LandInstability, which could impact infrastructure and buildings.
"'We have seen signs that the loss of ice is triggering other reactions which will result in further loss of ice and further ‘greening’ of Greenland, where shrinking ice exposes bare rock that is then colonized by tundra and eventually shrub,' one of the report’s authors, Jonathan Carrivick, said in a press release. 'At the same time, water released from the melting ice is moving sediment and silt, and that eventually forms wetlands and fenlands.'
"The loss of ice is creating what’s known as a #FeedbackLoop. Snow and ice typically reflect the sun’s energy back into space, preventing excessive heating in parts of the Earth. But as ice disappears, those areas absorb more solar energy, raising land surface temperatures, which can cause further melt and other negative impacts.
"#IceMelt also increases the amount of water in lakes, where water absorbs more heat than snow, which increases land surface temperatures.
"Greenland has been warming at twice the global mean rate since the 1970s, and the study’s authors warn that more extreme temperatures in the future are likely.
"Greenland is the world’s biggest island and is mostly covered by ice and #glaciers. Around 57,000 people live in the country, which is an autonomous country within the Kingdom of Denmark. Much of the population is #indigenous and many people there rely on natural #ecosystems for their survival.
"Michael Grimes, the report’s lead author, said that the flow of sediments and nutrients into coastal waters was particularly problematic for #IndigenousCommunities that rely on fishing, as well as for hunters on other parts of the island.
"'These changes are critical, particularly for the indigenous populations whose traditional subsistence hunting practices rely on the stability of these delicate #ecosystems,' he said.
"'Moreover, the loss of ice mass in Greenland is a substantial contributor to #GlobalSeaLevelRise, a trend that poses significant challenges both now and in the future.'"
https://www.cnn.com/2024/02/13/climate/greenland-ice-loss-vegetation-climate-intl/index.html
CNN · Greenland is getting greener. That could have huge consequences for the world
#Permafrost Thaw May Cause #Arctic River Erosion to Speed Up
October 09, 2024
"Permafrost, the thick layer of perennially frozen ground that covers much of the Arctic, slows down the migration of Arctic rivers, according to a new Caltech study. River migration is a common process in which a river's path meanders over time due to erosion of the riverbanks. This rerouting, which can also occur in #SuddenFloods, poses a threat for many communities that live along and depend on rivers. The findings also have implications for how the Arctic region will be impacted by a warming climate as permafrost thaws over time.
"The research was conducted in the Caltech laboratory of Michael Lamb, professor of geology, and is described in a paper appearing in the journal Nature on October 9.
"Led by graduate student Emily Geyman, the study focused on the #KoyukukRiver, a large tributary of the #YukonRiver that winds for hundreds of miles through interior Alaska. There was debate within the scientific community about whether the frozen soil along the riverbanks serves to fortify the banks against erosion or to promote it.
"'Large rivers like the Yukon or the Amazon can move tens to hundreds of feet per year,' Geyman says. "Arctic rivers in particular differ from temperate rivers because they need to thaw the material of their banks before they can pick that material up and move it.'
"Due to #ClimateChange, permafrost is slowly thawing over decades. But a river can experience drastic natural changes within a single year, with flow conditions changing from very cold and fast in early spring to warm and slow a few months later. Geyman and her collaborators leveraged these major changes that take place within a single season to gain a glimpse into how the rivers will behave in response to climate change decades or centuries into the future.
"In spring, the Koyukuk River swells in volume from snowmelt, flowing with fast, cold water. For more temperate rivers, a fast flow means more erosion. But in the Arctic, the temperature of the water matters—cold water is unable to thaw the frozen banks in order to migrate.
"In the new study, Geyman and her collaborators used satellite imagery of the Koyukuk over the past several years and developed a technique to decode high-resolution changes from the images. The team hypothesized that if permafrost was slowing the river's migration, they should only see migration later in the summer when the river water has warmed up. Their hypothesis matched with the satellite data, suggesting that permafrost does, in fact, slow down river migration.
"Next, the team compared sections of the river that flow through permafrost with those that do not. The Koyukuk is special because it traverses a patchwork of both permafrost and unfrozen ground. The team traveled to the Arctic to map the erosion on various bends of the river and found that sections without permafrost migrated twice as fast as analogous riverbends through permafrost terrain.
"The research is part of a larger effort to understand the dynamics of rivers and how they transport carbon, nutrients, and other materials trapped in the soil.
"'River migration has implications for local communities and infrastructure, and also for the Arctic environment,' Lamb says. 'About 1,500 gigatons of #carbon are stored in the frozen permafrost—about twice as much carbon as in the atmosphere, for comparison. There is also #mercury frozen in the soil that could be liberated into rivers as permafrost thaws. We are, ultimately, trying to understand what happens to these elements in the context of river erosion.'
"The work was a collaboration with local Alaska #Native communities, in particular from the town of #Huslia."
Read more:
https://www.caltech.edu/about/news/permafrost-thaw-may-cause-arctic-river-erosion-to-speed-up
California Institute of TechnologyPermafrost Thaw May Cause Arctic River Erosion to Speed UpCaltech researchers show that widespread permafrost thaw may cause rivers in the Arctic to migrate faster.
It's not just #Mercury that's going to be released when (not if) the #ArcticPermafrost melts -- and it's not just humans who will suffer the consequences!
Thawing #Arctic #permafrost could release #radioactive, #cancer-causing #radon
By Stephanie Pappas
published February 23, 2024
"As permafrost melts as a result of climate change, it may release more radon, a colorless, odorless gas linked with lung cancer."
Live Science · Thawing Arctic permafrost could release radioactive, cancer-causing radon