Articles tagged with Antarctic Ice
Scientists discovered ancient melting of East Antarctic ice sheet 5-3 million years ago during Pliocene Epoch, causing sea levels to rise 20 meters. This finding provides insights into future sea level rise due to global warming.
A new study by UC Irvine and others reveals that warm ocean waters are responsible for most of the continent's ice loss, accounting for 55% of shelf loss from 2003 to 2008. Ice shelves are melting at a rate twice as fast as the Antarctic ice sheet itself.
A new study using a 2,540-metre long Greenland ice core has reconstructed the island's temperature and ice sheet extent during the last interglacial period, known as the Eemian period. The research found that the warmest temperatures were about 8°C degrees warmer than average over the past 1,000 years.
Researchers from the West Antarctic Ice Sheet Divide, Whillans Ice Stream Subglacial Access Research Drilling, and Pine Island Glacier projects have reached significant technological milestones, advancing cutting-edge research on life in extreme ecosystems, ice sheet fate, and abrupt global climate-change events. Innovative drilling te...
A new study using Gravity Recovery and Climate Experiment (GRACE) satellite data has re-calibrated the scales to more accurately calculate ice mass loss. The research found that Antarctica overall is contributing less to sea-level rise than previously thought, with West Antarctica losing mass at an accelerated rate.
A new study reveals how warming waters in the Southern Ocean can connect with the movement of massive ice-sheets deep in the Antarctic interior. The research found that ocean warming can trigger increased flow of ice through narrow glaciers, causing inland sectors of the ice-sheet to become thinner and flow faster.
A British team will penetrate and sample an ancient buried lake beneath three kilometers of ice in Antarctica. The team aims to reveal secrets about the Earth's past climate and discover life forms that may exist in subglacial Lake Ellsworth.
A new study finds that microorganisms may convert old organic matter to methane under oxygen-deprived conditions in sedimentary basins beneath the Antarctic Ice Sheet. This could lead to significant methane release if the ice sheet shrinks, exacerbating global climate change.
A new study suggests that beneath Antarctica's ice sheet lies a massive potential methane reservoir, with estimates suggesting up to 400 billion tonnes of carbon. Microorganisms in sub-ice environments have been found to metabolize organic carbon into methane gas, which could be released during future ice-sheet collapse.
A team of scientists has uncovered a previously unknown sub-glacial basin beneath the West Antarctic Ice Sheet, suggesting this region is at higher risk of collapse. The basin's unique shape and smooth bed could trigger positive feedback mechanisms leading to ice sheet retreat.
Researchers found genetic similarities between Antarctic octopuses from separated regions, supporting the theory of a past ice sheet collapse. The study suggests that warming climate periods allowed for dispersal of creatures between areas now separated by the West Antarctic Ice Sheet.
The NRC report highlights accelerated global warming in the Arctic and Antarctica, with serious retreat of ice sheets and rising sea levels. Researchers emphasize the urgent need for balancing energy needs with addressing climate change.
A new study suggests that the seas rose 20 to 43 feet higher than today during an extremely warm period 400,000 years ago, contradicting previous estimates. The research provides a simple explanation for high beach deposits and infers that Greenland and West Antarctica ice sheets collapsed at that time.
Recent geosphere research interprets Eocene–Early Miocene paleotopography in Nevada and examines the origin of the Colorado Mineral Belt. The study also investigates Miocene magmatism in the Bodie Hills volcanic field, California and Nevada, and compares mountain building processes in Alaska.
An international team of experts investigates the changing mass of the Antarctic Ice Sheet using satellite observations, GPS data, and climate models. They aim to determine the evolution of the ice sheet's mass over the last 20 years and identify regions of change.
A study combining satellite data from NASA and aircraft missions has provided the clearest account yet of glacial ice surges into the sea after Antarctic ice shelves collapse. The research reveals rapid elevation decreases of over 500 feet for some glaciers, with total ice loss estimated at 11.2 gigatons per year.
Scientists have created the first high-resolution topographic map of the Aurora Subglacial Basin, revealing vast channels cut through mountain ranges by ancient glaciers. The data will help improve computer simulations of past and future Antarctic ice sheet behavior.
A study published in Global Change Biology found similarities in bryozoan species on the continental shelves of the Ross and Weddell seas, separated by the West Antarctic Ice Sheet. This suggests that these regions were connected by a trans-Antarctic seaway in the recent past, possibly as recently as 125,000 years ago.
A Scripps-led study found that extremely long waves originating along Pacific coasts may destabilize Antarctic ice shelves. The researchers propose that infragravity waves could initiate ice shelf collapse by opening crevasses and reducing ice integrity.
Researchers will drill through the Whillans Ice Stream and Ross Ice Shelf, sampling rivers, lakes, and microbial communities. The study aims to understand how the West Antarctic Ice Sheet responded to past climate changes and potentially discover new organisms that can produce beneficial compounds.
A new research project will drill through a half-mile of ice to penetrate subglacial Lake Whillans, studying hidden processes that govern the dynamics of the West Antarctic ice sheet. The team aims to develop predictive models of polar melting and understand how subglacial lakes influence ice motion.
A team of scientists has confirmed a major link between declining CO2 levels and the formation of Antarctica's ice caps. The study found that atmospheric CO2 levels reached a tipping point of around 760 parts per million when the Antarctic ice sheet began to form.
NYU is part of a $10 million NSF grant to study the Antarctic Ice Sheet's response to global warming. The project aims to develop a numerical model that describes ocean and ice interactions.
Researchers modeled West Antarctic ice sheet's past movements and found it collapsed and regrew multiple times due to ocean warming. The study uses deep sea oxygen isotope ratios to deduce Antarctic temperature changes and suggests the ice sheet may collapse if ocean temperatures warm sufficiently.
A new study published in Science suggests that a collapse of the West Antarctic Ice Sheet could lead to significantly higher sea level rise than currently projected, with devastating effects on coastal areas and global sea levels. The research takes into account various forces, including gravity, changes in the Earth's rotation, and la...
The study predicts a rise in sea levels around North America and southern Indian Ocean due to the collapse of the West Antarctic Ice Sheet, exceeding current estimates by as much as 25%. The ice sheet's melting will cause significant changes in global sea levels, with some regions experiencing rises of up to six meters.
A new study reveals that most of Antarctica has been warming at a rate comparable to the rest of the world, contrary to previous findings on the East Antarctic Ice Sheet. The research used satellite data and weather station measurements to estimate temperature trends and found that West Antarctica warmed more than East Antarctica.
The University of Delaware is part of an international team building the IceCube neutrino telescope, which will study high-energy cosmic events. The $150 million project will detect neutrinos passing through the Antarctic ice, opening new insights into astrophysics.
An international team is exploring two uncharted regions of Antarctica to study the impact of climate change on global sea levels. The research aims to understand how Earth's climate changed in the past and how future climate change will affect global sea level.
Researchers collected boulders from three glaciers in the Amundsen Sea Embayment, a region experiencing rapid ice sheet changes. The study's findings provide a long-term picture of glacier behavior and help improve computer models to predict future sea-level rise.
Scientists have discovered evidence of a subglacial volcano beneath the West Antarctic Ice Sheet, which erupted around 2000 years ago. The discovery provides vital insights into the ice sheet's dynamics and its potential impact on sea-level rise.
Researchers use echo-sounding equipment to create images of the ocean floor, providing evidence that West Antarctica was involved in the growth of the Antarctic Ice Sheet. The findings suggest that more of the continent hosted an ice sheet at the start of the 'icehouse' Earth period.
Experts warn of uncertainty over sea-level rise due to rapidly changing Antarctic Ice Sheet, particularly in the Amundsen Sea Embayment. Thinning ice shelves and increased melting are contributing to faster flow, potentially leading to 'runaway' thinning and several feet of sea-level rise over centuries.
Researchers have discovered a drumlin, a mound of sediment and rock, actively forming and growing under the ice sheet in Antarctica. The study, using time-lapse seismic surveys, reveals the drumlin grew ten times faster than expected, providing new insights into the drag on the underside of the ice.
Research reveals tidal motion affects West Antarctic Ice Sheet's largest ice stream, the Rutford Ice Stream, causing it to vary its speed by up to 20% every two weeks. This phenomenon, related to ocean tides and gravitational effects of the sun and moon, has important implications for predicting sea level rise.
A joint European effort, EPICA, reveals a direct connection between Arctic and Antarctic climates through 'bipolar seesaw', driven by Atlantic Ocean currents. This finding has significant implications for global warming research.
The IceCube project is a collaborative effort of over 30 scientific organizations, including the US National Science Foundation and more than a dozen US universities. The $272-million detector will use 4,200 light-sensing modules to sample high-energy neutrinos from space, excluding types like those from the sun.
Researchers used NASA's GRACE satellites to determine the Antarctic ice sheet is losing significant mass, with an estimated annual loss of up to 36 cubic miles. This decline in total ice mass has a global sea level impact equivalent to 0.4 millimeters annually.
The West Antarctic ice sheet's rapid discharge is making a significant contribution to global sea-level rise. Current computer models do not account for liquid water on ice sheet sliding, leading to conservative estimates of future behavior.
Researchers used an ice core to show that a key section of the West Antarctic Ice Sheet probably never contained as much ice as scientists originally thought it did. The study provides new information for interpreting climate and gives scientists new insights into how climate is changing today.
Researchers have discovered that the George VI Ice Shelf experienced a significant retreat around 9,500 years ago, driven by changes in ocean currents. This finding challenges the long-held assumption that rising air temperatures are the primary cause of ice shelf collapse.
Researchers detect distinctive fold in the ice, suggesting rapid movement and 'drawn down' towards the bottom of the ice sheet thousands of years ago. The finding implies that the centre of the ice sheet is more mobile than previously thought, requiring rethinking of existing models.
Researchers at UCSB discovered a correlation between Southern Ocean cooling and the expansion of Antarctic ice sheets around 14 million years ago. The study suggests that changes in global carbon cycling played a crucial role in this process, providing insight into the dynamics of Earth's climate system.
Scientists studying the West Antarctic Ice Sheet have found that all its ice streams have changed substantially over the last five years, with varying effects on thickness and flow rates. The changes suggest a complex picture of the WAIS's behavior, raising more questions than answers about its future impact on global sea levels.
The study reveals a 20% faster rate of Arctic sea ice loss over the last two decades compared to the previous three decades. In contrast, Antarctica experienced a dramatic loss followed by a gradual expansion of its sea ice cover since the mid-1970s.
The AMANDA II Telescope has produced a preliminary map of the high-energy neutrino sky, providing astronomers with their first glimpse of very high energy neutrinos. The map represents one year of data and shows that the detector works at the same sensitivity as telescopes used to detect gamma rays.
The AMANDA II Telescope has produced the first neutrino sky map, revealing tantalizing glimpses of high-energy neutrinos and their potential origins. The preliminary map represents one year of data, with future analysis expected to define the structure of the sky and confirm or disprove signals.
A team of scientists has discovered that an Antarctic ice stream has reversed its flow over the past 250 years, a phenomenon that may be linked to long-term climate change. The study reveals that changes in the ice sheet's configuration have led to a shift in the flow direction, potentially impacting global sea levels.
Recent research suggests that West Antarctic ice streams are experiencing normal variability, contrary to predictions of imminent shutdown and sea-level rise. The study found that local conditions, such as geothermal heat and frictional forces, drive the slowdown or speeding up of ice streams.
The Larsen B ice shelf has disintegrated in a record-breaking 35-day period, losing 3,250 square kilometers of shelf area. This collapse is attributed to strong regional climate warming, which has increased Antarctic temperatures by 2.5 degrees Celsius since the late 1940s.
Glacier melting and climate change are leading to sea level rises, with the world's glaciers shrinking faster than they did in recent millennia. The International Panel on Climatic Change (IPCC) projections are considered too low due to glacier sensitivity and hydrological cycle changes.
The Antarctic seafloor core suggests that Earth's orbital oscillations may be the key to controlling ice ages. The core shows regular intervals of ice sheet advances and retreats during a 400,000-year period, matching Milankovitch cycles.
Researchers discovered high levels of hydroxyl (OH) radical in the near-surface atmosphere over the South Pole, exceeding equatorial values. The findings suggest that glacio-chemists must be cautious when interpreting Antarctic ice cores, as changes in chemical species may continue for years after being trapped in the snowpack.
A new study revises previous estimates of the West Antarctic Ice Sheet's contribution to global sea-level rise, suggesting it may be a slower source. The ice sheet was previously estimated to add 1 millimeter per year to sea level, but new data indicates this may be an overestimation.
A study by Slawek Tulaczyk and Marion Bougamont reveals that the West Antarctic ice stream may slow down and stop moving altogether, leading to thinning and shrinking of the ice shelves. This could have dramatic consequences for global ocean circulation and climate.
Scientists have developed a new technique using ice-penetrating radar to study long-ago changes in West Antarctic ice streams. This allows them to look at changes much farther back in time, indicating possible fluctuations in the stability of the massive West Antarctic Ice Sheet.
A team led by MSU biologist John Priscu has discovered bacteria in an ice core from Lake Vostok, a subglacial body of water under the East Antarctic ice cap. The finding suggests that microorganisms can thrive in extreme environments, even under millions of years of isolation.
A new study suggests the West Antarctic Ice Sheet's complete disintegration in 7,000 years could be inevitable due to its potential instability. The ice sheet's collapse would raise global sea levels, flooding low-lying coastal regions and posing a significant threat to global climate patterns.
An international team of scientists analyzed satellite radar measurements, finding no significant melting or instability in the West Antarctic ice sheet's middle section. The study suggests the answer to whether global warming affects its stability is no, at least for now.
An ancient Antarctic ice core suggests a global climate-warming event occurred 12,500 years ago, with temperatures rising about 20 degrees Fahrenheit in a 50-year period. The findings challenge previous assumptions and throw new light on climate change research.