Articles tagged with Permafrost
Researchers found that thawing permafrost is increasing the concentration of organic matter in Arctic and subarctic ponds. This leads to oxygen depletion and cooler water at the bottom of the ponds, impacting microbial activity and greenhouse gas production.
A new study reveals that northern permafrost soils store nearly twice as much mercury as all other soils, the ocean, and the atmosphere combined. The discovery has significant implications for understanding the global mercury cycle and potential environmental consequences of thawing permafrost.
Researchers discovered that Arctic ponds can be hotspots for the degradation of dissolved organic carbon (DOC), releasing more carbon into the atmosphere. The study found that these ponds have distinct chemical compositions compared to rivers, and rapid permafrost thaw is adding carbon to them.
The EU project Nunataryuk explores the consequences of permafrost thaw on Earth's coldest shorelines, collaborating with local communities to devise new strategies. Thawing permafrost releases greenhouse gases, contaminates coastal waters, and harms marine habitats.
A new study published in Nature Communications outlines the mechanisms of converting permafrost carbon to CO2, highlighting the importance of sunlight and the right microbial community. The research found that sunlight enhances decay by some microbial communities, making frozen carbon more accessible to others.
A new study reveals that subsea permafrost in the East Siberian Arctic Shelf (ESAS) degrades at a rate of 18 cm/year, exceeding previous estimates. This suggests that massive methane emissions into the atmosphere may occur due to the destruction of hydrates, contradicting IPCC climate model predictions.
A study in the Mackenzie Delta found that thawing permafrost releases high amounts of geological methane, contributing significantly to climate change. The research team discovered strong emissions solely where permafrost is discontinuous, primarily from deeper geologic sources.
A new study suggests that monitoring wetland extent can better predict the release of methane from thawing permafrost. Researchers found that decomposition of new organic matter is the main source of methane released, not previously frozen carbon. This knowledge can help improve predictions and understanding of climate change impacts.
Researchers have discovered frozen methane domes on the Arctic Ocean floor that could indicate an increased risk of new methane blow-outs. The domes are stable due to high pressure but can collapse with a small change in water temperature, posing a threat to the environment.
A recent study found that permafrost thaw in northern peatlands can lead to a five-fold increase in nitrous oxide emissions. The emission rates matched those from tropical forest soils, highlighting the significant impact of Arctic warming on the global N2O budget.
A new international research study warns that global warming will thaw about 20% more permafrost than previously thought, potentially releasing significant greenhouse gases into the Earth's atmosphere. Nearly 4 million square kilometers of frozen soil could be lost for every additional degree of global warming experienced.
Research reveals large-scale thaw-induced slope disturbances and mobilization of primary glacial sediments, leading to cascading effects on fluvial, lacustrine, and coastal systems. The study's findings have major implications for predicting northern landscape change and downstream impacts.
The Arctic coast's thawing permafrost leads to increased erosion, releasing greenhouse gases and nutrients into the sea. This alters ecosystems, affects traditional fishing grounds, and impacts the Arctic population's way of life.
Researchers from Berkeley Lab will present various talks on climate modeling challenges, permafrost, induced seismicity and drought sensitivity in mountainous watersheds. They aim to map regions sensitive to drought conditions using historical data and identify environmental controls.
A new study found that melting permafrost during a past warming spike led to the massive release of stored carbon into the atmosphere, with severe deepening of the active layer and enhanced microbial respiration. The research provides crucial insights into how permafrost will respond to future climate change.
The study found significant changes in calcium, magnesium, and sulfate levels in the Yukon River over three decades, likely due to increased weathering and groundwater enrichment. These changes have cascading effects on Arctic Ocean currents and weather patterns worldwide.
A new mapping project identifies 20% of the globe's northern permafrost region as potential thermokarst landscape, storing twice as much carbon as currently in the atmosphere. Scientists can use the map to estimate greenhouse gas emissions and test assumptions about permafrost thaw.
A University of Alaska Fairbanks-led study measures methane release from Arctic permafrost, finding nearly no sign that it has begun, despite projections of large emissions in the future. The research suggests current rates are still below expected levels, but warn of a significant threat to global carbon levels.
A new study reveals that Siberian larch forests are still thriving in the Northern Russian permafrost despite rising temperatures, indicating a slow adaptation process that can take thousands of years. The research suggests that colder ice ages have delayed vegetation adaptation to warmer climate periods.
Researchers analyzed nearly three decades of air samples from Alaska's North Slope and found little change in long-term methane emissions. The findings suggest that processes regulating methane emissions need more study, as the Arctic warms faster than other regions.
Researchers found that permafrost beneath shallow Arctic lakes is warming due to warmer winters and increased snowfall, leading to sub-lake permafrost thaw. This phenomenon is similar to terrestrial permafrost thaw but occurs sooner due to lakebed temperatures rising above freezing.
A study by Northern Arizona University's Christina Schädel found that carbon dioxide is the largest contributor to permafrost thawing, with dry soils releasing more CO2 than wet ones. This discovery highlights the need to monitor changes in soil moisture conditions to better understand the impact of permafrost thawing on climate change.
Research by Dr Iain Hartley at the University of Exeter found that carbon dioxide is the biggest player in controlling future rates of permafrost thaw. Soils with dry conditions release more than three times as much carbon as those with wet, low-oxygen conditions.
A study published in Nature Climate Change found that carbon dioxide emissions from dry soils will strengthen the climate forcing impact of thawing permafrost. In contrast, oxygen-poor wetlands primarily release methane. The research highlights the need to monitor changes in soil moisture conditions, which have a greater effect on carb...
Scientists at PNNL are part of a core group advising the White House on microbiome research. The National Microbiome Initiative aims to study microorganisms' impact on climate science, food production, and human health.
A University of Illinois study found that including four key biophysical processes in computer models can estimate permafrost area and stability more accurately. The new model suggests that permafrost has declined more slowly than previously thought, and its release could impact climate change.
A study finds that brief warm periods can cause rapid ice wedge thawing in Arctic permafrost, leading to increased runoff and changes in the water balance. The research suggests that the Arctic will lose lakes and wetland areas if permafrost retreats, accelerating greenhouse gas emissions.
A new study reveals rapid melting of ancient ice wedges across the Arctic, affecting runoff and amplifying permafrost thawing. The research indicates widespread ice wedge degradation with major implications for global warming and thermokarst formation.
A recent study by Southwest Research Institute reveals that rapid melting of ice and permafrost in the Arctic is reshaping the tundra landscape. This degradation has led to widespread draining and differential subsidence, having long-term effects on plant life and wildlife across the region.
A new study finds that ice wedge degradation is widespread throughout the Arctic, altering ground topography and creating connective drainage systems. This leads to increased runoff and drying of the landscape, with significant implications for the region's hydrology.
A comprehensive field study reveals rapid microbial response to warming in tundra ecosystems, leading to increased greenhouse gas emissions and nutrient cycling processes.
A team of researchers from McGill University failed to detect active microbial life in permafrost soil from the University Valley in Antarctica, a location thought to be similar to Martian permafrost. The study's findings suggest that even in the coldest and driest conditions on Earth, it may be difficult to find signs of life.
New projections suggest the mean annual ground temperature at the top of permafrost on the North Slope has risen from 17.6 degrees Fahrenheit in 1988 to 28.5 F now, and is expected to reach 32 F by 2100, leading to substantial thawing in certain areas and widespread instability beneath infrastructure.
Alaska permafrost is projected to decline by 16-24% by 2100 under widely accepted climate scenarios, with more losses expected in central Alaska than northern Alaska. Climate change degrades permafrost, affecting ground and surface water pathways, transportation, and releasing stored carbon.
A recent study published in Scientific Reports found that wildfires on the Arctic tundra can cause significant permafrost thaw, with about a third of the fire's footprint experiencing thawing. This effect is similar to those observed in boreal forests where burns are more common.
Wildfires on Arctic tundra can contribute to permafrost thaw, changing ecosystems and affecting downstream waters. Researchers used lidar data to document thawing in the Anaktuvuk River fire's footprint, observing thermokarst and irregular topography.
A new study finds that Alaskan permafrost soil is biodegradable, releasing its stored carbon directly back into the atmosphere as CO2. The process occurs rapidly, with almost half of the carbon being consumed by microbes within 200 hours.
Researchers found that over half of the dissolved organic carbon in ancient yedoma permafrost decomposes within one week after thawing, producing significant amounts of carbon dioxide. This rapid decomposition is attributed to high concentrations of easily degradable organic acids, posing a critical threat to aquatic ecosystems.
An international team of scientists has identified 41 potential 'tipping points' where regional climate shifts could occur, including abrupt changes in ocean circulation patterns and vegetation. These events may happen at global warming levels below two degrees, challenging the notion of a safe limit.
Scientists warn of self-reinforcing cycle of permafrost thaw and global warming. Experts call on world leaders to act now to reduce carbon emissions from fossil fuel combustion.
A team of researchers developed a simple model of permafrost carbon based on direct observations. For every one degree Celsius of global warming, the amount of permafrost carbon that enters the atmosphere is equivalent to 1.5 years of global carbon dioxide emissions.
The study predicts that increased greenhouse gas emissions from thawing permafrost will result in significant economic losses. Researchers estimate that the total predicted impact of climate change by 2200 could be as high as $369 trillion, with $43 trillion in additional damage expected by end of century.
The first global permafrost database has been launched, offering a comprehensive dataset on permafrost temperature and active layer thickness. The GTN-P database, compiled by an international team of researchers from 25 countries, will help scientists better understand the extent to which climate change is causing permafrost thawing.
A new study found that Arctic rivers, such as the Mackenzie River, are responsible for burying large amounts of organic carbon from thawing permafrost at sea. This process locks away carbon dioxide and helps stabilize the earth's CO2 levels over time, providing a potential natural sink for excess greenhouse gas emissions.
A study found that thawing Arctic permafrost converts 60% of its organic carbon to carbon dioxide in two weeks, potentially creating a positive feedback loop. This release could significantly affect the climate change picture by introducing ancient carbon into the global carbon cycle.
A recent study found that thawing permafrost in Siberia is releasing ancient carbon into the atmosphere, which is then consumed by microbes and released as carbon dioxide. This process accelerates global warming and creates a runaway effect. Scientists are now studying the impact of this phenomenon on climate change.
Scientists predict a gradual, prolonged release of greenhouse gases from permafrost soils in Arctic and sub-Arctic regions. The rate of release is likely to be similar to current tropical deforestation levels, emphasizing the need for climate models to incorporate this factor.
New computer simulations suggest that thawing permafrost will release more carbon into the atmosphere than plants can absorb, leading to potential acceleration of climate change. The models also indicate a large range of uncertainty in the outcomes, highlighting the need for further research.
The study analyzed microbial activities in Alaskan soils, revealing diverse species and genes involved in degrading organic carbon and producing greenhouse gases. Researchers also found evidence of previously undescribed microbes and insights into microbial survival strategies in permafrost.
A study reveals new species of microbes in permafrost and active layer, hinting at life strategies under subzero temperatures. The researchers used 'omics' tools to understand how microbes survive and thrive in frozen conditions.
Researchers have reconstructed the development of winter temperatures in Russia's Lena River Delta, revealing a clear trend: warming winters over the past 7,000 years. The study used oxygen isotope analysis on ice wedges to access temperature information stored in the ice and compile it into a climate curve.
Scientists have found significant methane releases at depths of 20-50 meters off the West Yamal Peninsula in Siberia. The findings suggest a smaller, more fragile seal than previously thought, and a continuous thawing process driven by geothermal heat flux.
Heavy January rains in Svalbard caused record-breaking snow avalanches, making roads impassable. The extreme event also affected reindeer populations and permafrost temperatures, highlighting the increasing impact of climate change on Arctic ecosystems.
Researchers found that thawing Arctic permafrost soil may have released large amounts of carbon dioxide and other greenhouse gases into the atmosphere around 14,600 years ago. The study suggests that this process could have amplified initial warming through positive feedback, similar to current effects of permafrost thawing in Siberia.
Scientists found that sunlight, not bacteria, dominates the production of carbon dioxide in Arctic inland waters. Photochemical processing accounts for up to 95% of carbon conversion.
A University of Minnesota researcher found that Siberian lakes have pulled more greenhouse gases from the atmosphere than they have released into it since the last Ice Age. This process, known as thermokarst, has caused a slight cooling effect due to the sequestration of carbon in permafrost.
Research reveals thermokarst lakes in Arctic regions act as climate coolers over longer time scales, storing more carbon than emitting. The study finds that these lakes, which form from thawing permafrost, absorb significant amounts of carbon from the atmosphere, offsetting greenhouse gas emissions.
Researchers found that arctic thermokarst lakes switch from a net radiative warming to a net cooling climate effect about 5000 years ago. The lakes' carbon uptake rates are among the highest in the world due to the fertilization of mosses and other plants by thawing permafrost.
Researchers discover new permafrost forming around Twelvemile Lake in Alaska, but predict it won't last beyond the end of this century. The formation is attributed to willow shrubs providing shade and cooling the surrounding soil.
A new study found that permafrost thawing leads to increased release of methane and carbon dioxide into the atmosphere via plants. The research suggests that this could accelerate global warming trends by up to five times more carbon in the atmosphere.