Articles tagged with Ice Sheets
The Antarctic Ice Sheet's growth and decay are linked to changes in obliquity and atmospheric carbon dioxide levels. Loss of sea ice could amplify the effects of Earth's astronomical motions on the ice sheet's stability.
Researchers found that subglacial biological activity impacts atmosphere far more than previously thought. Methane was continuously exported from beneath the ice, with at least six tons transported to a measuring site from the Greenland Ice Sheet alone.
A new study by Woods Hole Oceanographic Institution reveals that sea levels are rising faster in some U.S. East Coast regions compared to others, primarily due to post-glacial rebound. The research team found that when post-glacial rebound was stripped away, sea level trends increased steadily from Maine to Florida, indicating the impa...
A new study by University of Colorado Boulder researchers found that ozone depletion above Antarctica increases snowfall, partially offsetting the continent's ice sheet mass loss. However, the gains in snowfall are outpaced by an even greater ice loss rate due to warming oceans.
Research shows Greenland's surface melting has increased dramatically since the mid-19th century, with a 50% increase in total ice sheet meltwater runoff versus the start of the industrial era. This study provides evidence that climate change is driving unprecedented rates of ice sheet melting, which could accelerate sea level rise.
Researchers found that Antarctica's mountains and valleys were formed by rivers, rather than glaciers, in a warmer era. The study suggests that this knowledge could aid in understanding how the ice sheet might respond to continued climate warming.
A kilometer-wide iron asteroid impact crater has been discovered in Greenland's Hiawatha Glacier, hidden under a half-mile-thick ice sheet. The crater, dated to the end of the Pleistocene era, was identified using radar data collected between 1997 and 2014.
A small ice-free oasis between sea ice-covered oceans and land ice sheets supported marine life for at least 5,000 years. This discovery sheds light on the vulnerability of Arctic ecosystems to rapid climate change.
Researchers found a small ice-free 'polynya' in the Arctic that sustained microscopic marine life for at least 5,000 years. This discovery provides insight into how marine ecosystems adapted to extreme climate conditions during the last Ice Age, highlighting their vulnerability and resilience.
Researchers found a centuries-long delay in West Antarctic Ice Sheet contraction after the Ross Ice Shelf collapse, adding complexity to sea level rise computer simulations. This discovery was made by analyzing sediment cores and fossilized life forms from the seafloor.
A new study reveals that East Antarctic Ice Sheet may melt under 2°C of sustained warming, posing a threat to global sea levels and human civilization. The research found that ice loss from the EAIS likely contributed to higher sea levels in the past.
A study suggests that parts of the East Antarctic Ice Sheet would melt if Antarctica warms by 2°C for millennia, contributing to rising global sea levels. The research found evidence from warm periods in Earth's history indicating the ice sheet had retreated during similar warming conditions.
A new study links Greenland ice sheet melting to natural climate patterns, the North Atlantic Oscillation and Atlantic Multidecadal Oscillation. The findings suggest that these patterns could accelerate or decelerate melting by two decades earlier or later this century.
A study by University of Washington researchers has discovered a new clue to the behavior of a region in West Antarctica, where a volcano under the ice sheet is leaving an almost 6,000-year record of glacier motion. The data suggests that the current thickening trend may be short-term and not indicative of long-term changes.
Researchers studying ocean temperatures in West Antarctica found a complex cycle of warming and cooling that affects ice shelf melting rates. The findings suggest that changes in deep ocean temperatures can lead to significant variations in ice sheet melting, with potential implications for global sea-level rise.
Researchers found that ice sheet meltwater contains a distinctive isotopic signature of silica, which supports the growth of diatoms in oceans. This study suggests that glacial meltwater plays a significant role in sustaining marine ecosystems and carbon cycles.
A study led by Tamara Pico from Harvard University estimates how glaciers moved by analyzing the weight of the ice sheet's impact on topography and river course. The researchers used a model that connects the growth of the ice sheet with changes in the Hudson River's direction, potentially offering new insights into glacier growth.
Researchers have discovered volcanic activity beneath the West Antarctic Ice Sheet, which could impact ice-sheet melting and sea level rise. The finding suggests that terrestrial ice on the continent may be more resilient to current carbon-dioxide levels than previously thought.
A new study reveals that bedrock in West Antarctica is rising at an unexpectedly fast rate, potentially increasing the stability of the ice sheet against catastrophic collapse. This rapid uplift may be due to a hotter and more fluid mantle beneath the area.
A new study reveals that the bedrock beneath West Antarctica's Ice Sheet is rising rapidly in response to ice melt, potentially stabilizing the ice sheet. This finding has significant implications for understanding and predicting sea level rise.
A new study has revealed that the bedrock below West Antarctica's ice sheet is rising at an unprecedented rate, suggesting a much more fluid Earth mantle than previously believed. This discovery could impact our understanding of climate changes in Antarctica and have significant implications for global sea levels.
A rapid rebound of Antarctic crust may help stabilize the West Antarctic Ice Sheet against catastrophic collapse. The Amundsen Sea Embayment is experiencing an uplift rate of 41 millimeters annually, which could delay collapse events under strong climate forcing.
Researchers at University of Kansas developed a new formula to predict ice flow in Greenland and Antarctica glaciers that reduces uncertainty in future sea-level rise predictions. The study found subglacial water pressure controls the speed of ice flow, rather than basal friction.
Research suggests that the land-based portion of the East Antarctic Ice Sheet has remained stable for the past 8 million years, with minimal retreat in response to current carbon dioxide levels. However, the team warns that increasing atmospheric emissions could destabilize the ice sheet and contribute to sea level rise.
A recent study found that much of East Antarctica's land-based ice sheet has remained stable over the past 8 million years, despite rising atmospheric carbon dioxide levels. This suggests that some ice on the continent could be resilient to a warming climate, but does not mean it will completely prevent sea-level rise.
New research published in Nature shows that land-based sectors of the East Antarctic Ice Sheet were mostly stable throughout the Pliocene, a period with carbon dioxide concentrations similar to today's. The terrestrial segment is more resilient at current carbon dioxide levels, but marine-based ice may still contribute to sea level rise.
Scientists discovered that the West Antarctic Ice Sheet rebounded by up to 400 kilometers 10,000 years ago due to isostatic rebound. However, this process is too slow to prevent ice sheet melting and sea-level rise caused by current climate change.
Scientists discovered that the West Antarctic Ice Sheet regrew in recent history due to a previously unknown mechanism involving its own shrinking and crustal uplift. The findings contradict previous assumptions and suggest that global sea levels may decrease due to ice sheet readvances.
A recent climate assessment reveals that Antarctica's ice sheet has been losing mass at an unprecedented rate, contributing to a threefold increase in global sea level rise. The continent's ice losses have risen from 53 billion tonnes per year in the 1990s to 159 billion tonnes per year since 2012.
Scientists found that the West Antarctic Ice Sheet (WAIS) was smaller than it is today at some point between 14,500 and 9,000 years ago, but did not collapse. The loss of ice triggered uplift in the sea floor, leading to regrowth of the ice sheet.
Reduced sea ice coverage has triggered the catastrophic disintegration of Antarctic ice shelves, causing them to flex and break under storm-driven ocean swells. This leads to the formation of long thin 'sliver' icebergs that eventually calve from the shelf front, contributing to sea level rise.
A lake sediment record near the Greenland Ice Sheet margin preserves sediments from past interglacial periods, including the Early Holocene and Last Interglacial Period. July air temperatures during these periods were estimated to be significantly warmer than modern temperatures.
Researchers found ancient lake mud and fly species that record two interglacial periods in northwest Greenland, revealing warmer temperatures than previously thought. This discovery could improve climate models and predictions of how the ice sheet might respond to man-made global warming.
The study found that the ice stream has lost about 12% of its mass over the past 45,000 years, with losses occurring during both warm and cold periods. This suggests that NEGIS is particularly sensitive to environmental changes, which may exacerbate the impact of anthropogenic climate change.
Scientists from CReSIS and the US/UK will deploy radar technology to map Thwaites Glacier's bed topography and measure ocean interaction. This effort aims to predict the glacier's rapid retreat and resulting sea-level rise.
Researchers connected microscopic theories to the world's largest granular material, a glacial ice mélange, to understand its dynamics and impact on glaciers. The study provides quantitative tools for glaciologists modeling ice shelves with ice mélanges.
A new study from University of Wisconsin-Madison scientists describes a method using cloud characteristics to quantify snowfall on the Greenland Ice Sheet. The research found two distinct cloud types producing snow at Summit Station, with mixed-phase clouds accounting for 51% of snow accumulation.
A new study reveals that algae and impurities on the Greenland ice sheet's surface are causing it to darken, leading to accelerated melting. The Dark Zone, a 400km-wide region, is found to be covered in dust and black carbon that provide nutrition for dark-colored algae.
A team of researchers found that changes in sea levels during the Early Triassic period were caused by variations in the Earth's tilt, affecting ocean and groundwater volumes. The study suggests that this natural process may contribute significantly to future sea-level rise.
A study by Dartmouth College reveals that the West Greenland Ice Sheet melted at a dramatically higher rate over the last twenty years than at any other time in the modern record. The researchers attribute this unprecedented ice loss to a combination of specific weather patterns and an additional long-term warming trend associated with...
Researchers propose targeting geoengineering at specific negative consequences of climate change, slowing sea-level rise by preserving continental ice sheets. The engineering costs and scales of these projects are comparable to today's large civil engineering projects, but with extra challenges due to the remote polar environment.
A growing network of fast-draining lakes on the Greenland ice sheet triggers a chain reaction that speeds up ice flow, posing a new risk for the ice sheet's long-term stability. The research, led by the University of Cambridge, reveals that these 'drainage events' can temporarily accelerate ice flow by as much as 400%.
The study reveals that methane hydrate melts from the Arctic sea floor due to sea floor uplift, causing a slow and steady methane release over 8000 years. The research suggests that this process is more likely than ocean warming as the cause of methane seeps in the region.
A new study reveals that the collapse of the Laurentide Ice Sheet in North America approximately 16,000 years ago led to significant climate variations in West Antarctica and the tropical Pacific. The research suggests a previously undocumented inter-polar climate change mechanism.
Researchers have measured a significant increase in heat loss from the Earth's interior, warming deep water in northeast Greenland fjords and melting glaciers. This heat triggers ice sheet sliding towards the sea, with the potential to improve models of ice sheet dynamics and global water rise predictions.
Researchers have developed a machine learning model to predict geothermal heat flux beneath the Greenland Ice Sheet, revealing an anomalously high heat flux in northern regions. The study uses 22 geologic variables to improve ice-mass loss and global sea-level rise predictions.
Researchers found algae significantly reduce ice sheet's albedo and contribute to its melting. Algal darkening is responsible for 5-10% of total melt each summer, according to the study.
New research reveals the East Antarctic Ice Sheet has undergone significant growth and shrinkage over millions of years, with frequent intervals of open water along the Sabrina Coast. This dynamic behavior is a concern as climate change raises global air temperatures and could lead to dramatic ice mass loss.
Researchers found that the East Antarctic Ice Sheet has a history of expanding and shrinking, indicating it could contribute to global sea level rise. The study used geophysical and geological data to reconstruct how glaciers on the Sabrina Coast have advanced and retreated over 50 million years.
A UCLA-led team used extreme fieldwork and climate modeling to unravel a meltwater mystery on Greenland's ice sheet. They discovered that sunlight penetrating into the ice causes subsurface melting and storage of meltwater, leading to discrepancies between models' estimates and real-time data.
A decline in atmospheric CO2 levels triggered the Mid-Pleistocene Transition, a 400,000-year period with long-lasting effects on ice age cycles. The study suggests that changes in dust flux and ice sheet sensitivity contributed to the transition.
A new study reports that much of western Canada was ice-free as early as 14,000 years ago, contradicting previous estimates. The research suggests that the Cordilleran Ice Sheet retreated more than a millennium sooner and holds implications for understanding climate patterns and human migration.
Research published in Science shows climate warming reduced the mass of the Cordilleran Ice Sheet by half in 500 years, indicating a similar fate for the Greenland Ice Sheet. The study suggests that once ice sheets start to melt, they can do so quickly, causing significant sea level rise and changes in ocean circulation.
Researchers have created high-resolution maps of Greenland's bedrock and coastal seafloor, showing that two to four times more glacier fronts are at risk of accelerated melting than previously thought. The new data suggests that warmer ocean water is melting deeper-seated glaciers, potentially increasing sea level rise.
Researchers found that ancient volcanic eruptions caused significant melting of the northern European ice sheet, with some eruptions leading to 20 centimeters of ice loss. The study suggests that modern ice sheets may be vulnerable to similar effects, highlighting a potential positive feedback loop between volcanism and climate change.
Ocean data from Northeast Greenland reveals long-term impact of ice sheet melting on freshwater content, affecting fjords and global ocean circulation. The study finds that increased freshwater input reduces plankton algae production, impacting fish stocks and potentially European climate.
Recent findings suggest that rapid sea-level rise of about 20m in less than 500 years occurred in the last deglaciation, causing the drowning of fossil coral reefs in Hawaii. The study provides new evidence of a meltwater pulse, associated with catastrophic ice-sheet collapse and the Earth's warming after the last ice age.
Researchers detect tell-tale differences in sea level rise around the world due to changes in continental water and ice sheet mass. The study uses time-variable gravity data from NASA's Gravity Recovery & Climate Experiment satellites.
A new study from Indiana University validates the stability of the East Antarctic ice sheet's central core, even if the West Antarctic ice sheet melts. The research team found evidence confirming the stability at an altitude of 6,200 feet, suggesting that climate change may not have a significant impact on the interior ice sheet.
New research confirms that Greenland's outlet glaciers slide over wet, slippery sediment rather than hard rock, and this will accelerate ice flow as global temperatures rise. This challenges the view of a slowdown in ice flow, suggesting a more complex future pattern of ice sheet movement.