Articles tagged with Antarctica
Researchers urge concerted action to mitigate global warming's impact on polar ecosystems, which are both the most-threatened and least-understood areas. The study aims to map all biodiversity in these regions to sustainably manage unique habitats and their ecosystem services.
A team of researchers discovered 27 avian footprints on the southern Australia coast dating back to the Early Cretaceous period. The tracks provide evidence for early avian evolution and suggest a possible migratory route, with some tracks showing similarities to modern-day shorebirds.
Researchers have discovered a potential bottleneck in Adélie penguins' annual cycle, which could be exacerbated as the climate continues to change. The study found that seasonal Antarctic sea ice plays a crucial role in the penguins' molting periods, with low sea ice concentration signaling extended gaps in post-breeding diving activity.
Over 71 of Antarctica's 162 ice shelves have reduced in volume over the past 25 years, with a net release of 7.5 trillion tonnes of meltwater into the oceans. The western side of Antarctica experienced significant ice loss, while the eastern side remained relatively stable.
Research reveals the grounding line of the Ronne Ice Shelf can shift up to 15 km with changing tides, controlling ice stability and potentially accelerating ice melt. This finding highlights the need for improved observations and modeling of tidal processes to predict Antarctica's response to climate change.
A new laser-based sampling system allows for higher depth resolution, enabling scientists to reconstruct continuous annual temperature changes thousands of years ago. The LMS system overcomes previous limitations in sampling ice cores, preserving critical oxygen and hydrogen isotopes needed to infer past temperatures.
Researchers have identified pathways through which warm ocean water flows into ice shelf cavities for the first time. The study found broad ocean heat intruding toward the shelf, with seawater temperatures up to 1℃ higher than freezing at depths of 50-100 meters.
A new report reveals that Antarctica experienced both a record-breaking heatwave and extreme precipitation in 2022. The coldest and driest continent's ice sheet lost significant amounts of ice, contributing to sea level rise. Despite this, the region's snowfall actually protected the world against further sea level rise.
A new study analyzes relationships between body size, trophic level, latitude, and depth for 5,619 marine fish species. Marine fish species tend to have larger body sizes and higher trophic levels in high latitudes, while opposite patterns are observed in warmer latitudes.
Researchers found no indication of irreversible retreat in West Antarctica's ice sheet, but warn that current climate conditions could trigger slow and certain loss of ice over hundreds to thousands of years. The study suggests that even with no additional warming, an irreversible collapse is possible in 300-500 years.
A new study published in the Journal of Glaciology suggests that prior attempts to evaluate the mass of Antarctic ice shelves may have overestimated their thickness. The researchers found that on average, the Antarctic ice shelves are nearly 6% thinner than previously assumed, a difference of about 17 meters.
Researchers found that tidal currents from Prydz Bay contribute significantly to basal melting on the Amery Ice Shelf, with a maximal tidal contribution estimated at 69%. This discovery suggests that tides may play a key role in Antarctica's ice shelf melting.
Researchers find catastrophic breeding failure for emperor penguins due to Antarctic sea ice loss. The study indicates that over 90% of emperor penguin colonies will be quasi-extinct by the end of this century, based on current global warming trends.
A multinational team of researchers studied the flow of warm water to the Totten Ice Shelf, revealing crucial details on how Circumpolar Deep Water interacts with the glacier and accelerates melting processes. The findings highlight the importance of bathymetry and regional circulation in regulating ocean heat transport towards the ice...
Researchers have discovered clues about Antarctica's ice sheet formation in Mississippi mud, suggesting a 300,000-year brake on climate cooling. The study provides new insights into the Eocene-Oligocene transition, a significant climate event that had a major impact on Earth's history.
Researchers develop a new model predicting up to twice the original amount of subglacial water may be draining into the ocean, accelerating glacial melt and sea level rise. The theory uses satellite measurements and is a simple equation that can predict exfiltration in a fraction of a second on a laptop.
The Arctic Monitoring and Assessment Programme (AMAP) has played a vital role in recognizing and mitigating environmental pollution and climate change in the Arctic. Its efforts have led to significant reductions in pollutants in the Arctic and influenced global agreements, inspiring similar initiatives in other regions.
Recent extreme events in Antarctica and the Southern Ocean are likely to become more common and severe due to global warming. The study calls for urgent policy action to protect the continent's fragile environments, which have global implications if not preserved.
Researchers have discovered fossils of a group of spurges in Argentina that date back 52 million years, suggesting these plants migrated from South America to Asia and beyond. The findings provide the first direct fossil evidence of spurges in Gondwanan South America, contradicting previous assumptions about their Asian origins.
A recent study suggests that El Niño's impact on precipitation in West Antarctica is not significant, contradicting its effect through the Amundsen Sea low pressure system. However, different types of El Niño events have opposing impacts on the Antarctic Peninsula and surrounding seas.
A new study led by Brown University researchers reveals that Martian gullies could have been formed by on-and-off periods of meltwater from ice on and beneath the planet's surface. The study found that when Mars tilts on its axis to 35 degrees, conditions become dense enough for brief episodes of melting to occur.
Researchers found minimal change in surface melt rates over the past four decades, despite rising global air temperatures. However, Antarctic ice shelf surface melt rates are expected to increase substantially in the coming decades due to climate change.
Analysis of the Thwaites Glacier in West Antarctica shows there is less sedimentary rock than expected, a finding that could affect how the ice slides into the ocean. The new map of the geology of the region provides an exciting basis for better predictions of future ice flow and sea level rise.
Scientists at Rice University found a natural 150-day cycle in the north-south oscillation of atmospheric pressure patterns, influencing hemispheric-scale precipitation and ocean surface wind stress. This discovery challenges conventional wisdom about atmospheric organization and has implications for climate modeling.
Researchers have created a detailed map of the geology beneath Thwaites Glacier in West Antarctica, showing that only about a fifth of the ground is sedimentary rock. This finding could affect how the glacier behaves as it retreats due to climate change, with potential implications for ice flow and loss from other glaciers.
A new study shows that the Montreal Protocol is delaying the occurrence of the first ice-free Arctic summer by as much as 15 years. The treaty's implementation has postponed the melting of Arctic sea ice at this very moment, yielding measurable results within a few decades of its implementation.
Scientists have discovered weak, fossilised sediments beneath the seafloor of Antarctica's eastern Ross Sea, which led to massive underwater landslides. These layers made the area susceptible to failure due to past climate change.
A new study calls for enhanced chemical pollution monitoring in Antarctica to support global chemical policy. The research highlights the need for Antarctic Treaty consultative parties to extend their national monitoring programs to their research stations and territories.
A non-native midge species is significantly increasing rates of plant decomposition, resulting in three to five-fold increases in soil nitrate levels on Signy Island. The midge, Eretmoptera murphyi, is altering soil ecosystems and potentially 'opening the door' for other species to become established.
The Antarctic and Arctic seas are responding differently to climate change, with the Arctic experiencing more rapid melting and thinning. Continuous monitoring is crucial to understand how global warming affects each region's unique characteristics.
The researchers used the Near-Infrared Sky Brightness Monitor (NISBM) to collect data on sky brightness in Antarctica. The results show that the background intensity of the sky is not influenced by the Sun at a specific inflection point, and the NISBM detected significantly lower brightness in the Ks band compared to other locations.
The seven worst years for polar ice sheet melting and losing ice have occurred during the past decade, with 2019 being the worst year on record. Global heating is driving up sea levels and coastal flooding around the world, with melting ice sheets accounting for a quarter of all sea level rise.
Research led by The University of Alabama reveals a dense, yet thin, layer of ancient ocean floor surrounding the Earth's core-mantle boundary. This ultra-low velocity zone is denser than the rest of the deep mantle and may play an important role in heat escape from the core.
A recent study on the pike icefish revealed significant genetic changes as it migrated from Antarctic to temperate waters. The researchers found divergent genes associated with the physiology that needed to change in response to the new environment, including mutations in the antifreeze glycoprotein gene.
Recent research by Norwegian University of Science and Technology revealed that East Antarctica's ice sheet melted rapidly along its margins between 9,000 to 5,000 years ago. The study suggests that the less stable, rapidly flowing parts of the ice sheet were broken up more easily, leading to the ice sheet becoming much thinner within ...
Scientists have calculated that the Amundsen Sea Embayment in West Antarctica has lost over 3,000 billion tonnes of ice over a 25-year period. The ice loss is attributed to extreme snowfall events and changes in ocean temperature and currents, contributing up to nine millimetres to global sea levels.
Researchers found zero skua nests and almost zero Antarctic petrel and snow petrel nests in regions with significantly higher snowfall than previous years. Extreme snowstorms interfere with the birds' ability to breed, causing tens of thousands of chicks and eggs to die.
Researchers used drones to map large areas of Antarctica, capturing unprecedented high-resolution imagery of vegetation and biodiversity in protected areas. The vision identified areas with moss and lichen not previously picked up by satellite, providing valuable insights into the fragile ecosystem.
Satellite observations reveal Antarctic sea ice extent has dropped to a record low of 1.788 million square kilometers, marking a reversal from long-term increasing trend to a decreasing one. This occurrence raises questions about the cause and implications of this change, particularly in light of human-caused global warming.
A new study using satellite images found that glaciers on the Antarctic Peninsula are flowing up to 22% faster during summer months due to warmer ocean waters and melting snow. This speed-up, driven by reduced friction between ice sheets and underlying rock, poses a significant threat to global sea levels.
The COALA project aims to measure the relationships between aerosols and clouds in Antarctica's 'clean-air laboratory' using ground-based instruments. Long-term observations will help scientists better understand cloud formation, precipitation, and radiation budget in this region.
A new study warns that an irreversible loss of West Antarctic and Greenland ice sheets may be imminent if global temperature change cannot be stabilized below 1.8°C, leading to rapid sea level rise.
The study of two Antarctic blue whales tagged in the east Antarctic sector of the Southern Ocean reveals significant logistical challenges and provides initial insights into foraging ecology, habitat preferences, distribution, movement rates, and feeding patterns. The satellite tracks will assist the International Whaling Commission's ...
A study published in Atmospheric Chemistry and Physics found that phytoplankton productivity in the Southern Ocean contributes to dense clouds that reflect sunlight. The high density of water droplets in these clouds helps regulate global temperatures and precipitation patterns.
Research from the University of California, Santa Cruz, found that abundant krill supplies lead to more humpback whale pregnancies, while scarcity results in fewer pregnancies. The study suggests reduced krill stocks due to climate change and industrial fishing will impact humpback whale populations.
New research reveals that West Antarctica's ice sheet collapse is not inevitable, with regional variations in climate and ocean circulation affecting the pace of ice loss. Changes in ocean temperature, driven by shifts in offshore wind patterns, have slowed down ice melt in vulnerable regions.
Researchers have uncovered the most detailed look yet at Earth's recent climatic history by analyzing Antarctic ice cores. The study provides a record of summer and winter temperatures dating back 11,000 years, offering an important baseline for understanding climate change.
Researchers have found that a weak ocean gyre near the Thwaites Ice Shelf allows more warm water to access its base, causing it to melt. This process is driven by waters from nearby melting ice shelves and can impact the stability of adjacent ice shelves, contributing to global sea-level rise.
Climate change is expected to lead to a 65% decline in land plants and animals by 2100 if current management strategies are not implemented. Implementing ten key threat management strategies could benefit up to 84% of terrestrial bird, mammal, and plant groups, with a cost of $23 million annually.
Australian scientists confirm that Theria (placental and marsupial mammals) evolved in Gondwana 50 million years ago before migrating to Asia. The discovery challenges long-held theories of mammal evolution.
Researchers at CReSIS have developed an adaptable radar system for unmanned aerial systems, enabling more complete data on ice-sheet thickness. The new system will improve ice-discharge estimates and allow routine monitoring of sea ice snow cover.
A University of Otago study found that ice ages occurred every 41,000 years until 400,000 years ago, contradicting previous assumptions of a 100,000-year cycle. The research uses sediment cores and paleomagnetic analysis to reconstruct changes in the Earth's magnetic field.
Researchers found that using coupled atmosphere-ocean-sea ice circulation models with observation-based datasets, they can predict Antarctic sea ice variability over decadal time scales. The initialization of subsurface ocean temperature and salinity fields significantly improves prediction skills, especially in the west Antarctic region.
A team of 15 researchers will drill through ice cores 2.7 km deep, revealing temperature and greenhouse gas data from the past. The project aims to solve the mystery of climate periodicity during the Mid-Pleistocene Transition.
A study found that Antarctic ice-free areas will create new habitats for some species, but also increase competition and risk of invasion by non-native species. The research highlights the need to address key questions about the impacts of these changes on biodiversity.
A new study reveals that global warming and ocean acidification are threatening marine organisms with calcium carbonate skeletons, such as corals and sea urchins. The researchers found a clear pattern showing that species with high levels of magnesium in their skeletons become more common with warmer seawater temperatures.
Research reveals microplastic fibres in all samples, with majority found in Antarctic air, indicating animals breathe them. Antarctic sea ice also traps microplastics, acting as a temporary sink for global plastic pollution.
A recent study found that most Antarctic species' chemical compounds can repel amphipod predators but are ineffective against hermit crabs, which could decimate local populations. This highlights the vulnerability of Antarctic ecosystems to invasive species and underscores the importance of long-term research on the seafloor.
Researchers found Antarctic summer thaw occurs nearly a month earlier than previously believed, lasting two months longer. This extended melt is beneficial for organisms needing meltwater but poses a threat to permafrost stability.
A 460km-long river under the Antarctic ice sheet affects the flow and melting of ice, potentially accelerating ice loss. The discovery reveals more active water flow than previously thought, which could make it more susceptible to changes in climate.