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Articles sur Permafrost

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Water from the Mackenzie River, seen from a satellite, carries silt and nutrients from land to the Arctic Ocean. Jesse Allen/NASA Earth Observatory

Arctic rivers face big changes with a warming climate, permafrost thaw and an accelerating water cycle − the effects will have global consequences

A new study shows how thawing permafrost and intensifying storms will change how water moves into and through Arctic rivers.
Giovanna Stevens grew up harvesting salmon at her family’s fish camp on Alaska’s Yukon River. Climate change is interrupting hunting and fishing traditions in many areas. AP Photo/Nathan Howard

Arctic Report Card 2023: From wildfires to melting sea ice, the warmest summer on record had cascading impacts across the Arctic

The early heat melted snow and warmed rivers, heating up the land and downstream ocean areas. The effects harmed salmon fisheries, melted sea ice and fueled widespread fires.
Polygon fields evolve and change overtime reflecting the flow of water at different stages in planetary history. Axel Heiberg Island, Qikiqtani Region, Nvt. (Mark Jellinek, Author Provided)

How Arctic landscapes and Canadian cityscapes share a similar pattern

While a seemingly remote and unfamiliar landscape, the Arctic shares many surprising similarities with contemporary Canadian cityscapes.
Permafrost and ice wedges have built up over millennia in the Arctic. When they thaw, they destabilize the surrounding landscape. Michael Robinson Chavez/The Washington Post via Getty Images

Thawing permafrost is roiling the Arctic landscape, driven by a hidden world of changes beneath the surface as the climate warms

Ground is collapsing and massive lakes are draining in a matter of days. Thawing permafrost is having profound effects on the region and its infrastructure.
Changes in vegetation and temperature affect wildlife and humans, as well as the climate. Lisa Hupp/USFWS

Arctic greening won’t save the climate – here’s why

The growing season on the tundra is starting earlier as the planet warms, but the plants aren’t sequestering more carbon, a new study finds.
Community members from Utqiagvik, Alaska, look to open water from the edge of shorefast sea ice. Matthew Druckenmiller

2021 Arctic Report Card reveals a (human) story of cascading disruptions, extreme events and global connections

Sea ice is thinning at an alarming rate. Snow is shifting to rain. And humans worldwide are increasingly feeling the impact of what happens in the seemingly distant Arctic.
The Denali Highway as it crosses the Susitna River. Joe Sohm/Visions of America/Universal Images Group via Getty Images

Infrastructure bill passed by Congress promises billions for bridge repair – rural Alaska shows the growing need as temperatures rise

Alaska is warming faster than any other U.S. state, and that’s causing problems, a team of bridge engineers and social scientists explains. The infrastructure bill in Congress would offer some help.
Permafrost is thawing across the Arctic, releasing microbes and organic materials that have been trapped in the frozen ground for thousands of years. NOAA via Wikimedia Commons

Thawing permafrost is full of ice-forming particles that could get into atmosphere

New research shows that permafrost contains huge amounts of particles that make it easier for cloud moisture to freeze. Thawing permafrost is releasing these ice-nucleating particles.
Missing a field season can be devastating if your research subject is melting away. Karen Lloyd

From permafrost microbes to survivor songbirds – research projects are also victims of COVID-19 pandemic

Three scientists describe the fieldwork they’ve had to delay in 2020 because of the pandemic. These are setbacks not just for their careers, but for the body of scientific knowledge.

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