Articles tagged with Sea Ice
Bowhead whales are shifting their migration patterns due to declining sea ice in the Arctic, affecting their long-term health and impact on Indigenous communities. The lack of ice is causing changes in bowhead availability for hunters, leading to competition for resources and increased human interaction.
A new study found that powerful storms called atmospheric rivers are increasingly reaching the Arctic in winter, slowing sea ice recovery. These storms carry large amounts of water vapor and produce extreme rainfall and flooding when they make landfall.
Researchers found two distinct climate intervals where sea ice and ice-free summer conditions likely supported early human migration along the Pacific coastal route. These conditions, occurring from 22,000 to 24,500 years ago and again from 14,800 to 16,400 years ago, may have facilitated movement by providing a more traversable surfac...
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.
Researchers synthesized multisource data to explore spatiotemporal variations of melt/freeze onsets, revealing a 3-month delay in basal freeze onset compared to surface. The study highlights the importance of synchronous monitoring of air-ice-ocean system and suggests a possible delay in Arctic sea ice loss due to climate change.
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.
The strongest Arctic cyclone ever observed poleward of 70 degrees north latitude caused a 30% greater loss of sea ice than previous records, with waves reaching up to 100 kilometers towards the center of the ice pack. Researchers suggest that existing models underestimate the impact of big waves on ice floes in the Arctic Ocean.
A regime shift in the Southeast Greenland marine ecosystem has led to a permanent change from an ice-infested to a more temperate system, with large numbers of fin and humpback whales migrating to the area. This tipping point may be irreversible, having cascading effects throughout the ecosystem.
Researchers used NASA's Earth observing system to estimate light availability beneath Antarctic sea ice and found significant phytoplankton blooms in nearly all example floats. The study suggests that 50% or more of under-ice Antarctic waters may support blooms, potentially supporting life beneath the ice.
A new study by the University of Gothenburg reveals that the salinity of surface water is crucial for sea ice formation at low temperatures. The study finds that warm water is prevented from rising to the surface due to its lower salinity, creating a 'lid' that allows cold polar temperatures to freeze continuously moving warmer water.
Scientists have found that narwhals are changing their migration patterns in response to sea ice loss due to climate change. The study, published in PNAS, shows significant delays in autumn migrations and sex-specific differences in departure times.
The Arctic Ocean's pH is decreasing at a rate 3–4 times faster than in other oceans, with acidification impacting marine life. Sea butterflies, a key food source for whales, may face reduced availability due to increased carbon dioxide uptake.
Researchers at Hokkaido University have discovered the importance of Frazil ice in producing dense cold water, which is a key component of global ocean circulation. This finding has significant implications for understanding the impact of global warming on this process.
Long-term monitoring data reveals previously undetected diurnal patterns in narwhal behavior, including changes in surface activity and diving patterns influenced by sea ice and squid migration. The study's method can be applied to assess the challenges faced by narwhals and other Arctic animals due to climate change.
Researchers at UiT The Arctic University of Norway have developed a new dataset measuring Arctic sea ice thickness throughout the year. This breakthrough allows for safer shipping in the Arctic and more accurate weather and climate forecasts.
Scientists used centuries-old clam shells to study the North Atlantic's evolution and response to external changes. The findings indicate that the system destabilized and lost resilience prior to the Little Ice Age, potentially causing it to 'tip' into a new, colder state.
Researchers studied heat movement near North Pole and under Arctic sea ice, providing insights into the mechanisms of Arctic sea ice decline. Their findings suggest that strong winds cause mixing of water where ice and ocean meet, leading to enhanced heat transfer and changes in seawater salinity.
Researchers confirm significant increase in freshwater entering the Arctic Ocean via the Bering Strait, leading to a decrease in saltiness and potential impacts on sea ice formation and regional ecosystems. This change could also affect climate-sensitive processes, such as deep water mixing in the North Atlantic.
A new model suggests Antarctica's ice shelves are melting at an accelerated rate due to the Antarctic Coastal Current. Freshwater from melting ice can trap warm ocean water beneath the shelves, causing them to melt further. This mechanism could increase sea level rise predictions by up to 40%.
Researchers from CU Boulder and NCAR found that soot and burned biomass from wildfires can affect Arctic sea ice, causing ripple effects on global climatic patterns. This study suggests a feedback loop between wildfires and Arctic sea ice, highlighting the interconnectedness of climate systems.
Researchers from Colorado State University have made direct observations of ice nucleating particles in the central Arctic, revealing strong seasonality and seasonal changes. These findings provide crucial insights into the effects of climate change on clouds and precipitation patterns.
A previously unknown subpopulation of polar bears living in Southeast Greenland has been genetically distinct and uniquely adapted to its environment. The study provides insight into how the species might persist into the future, but highlights the need for careful extrapolation due to limited access to sea ice.
Researchers found that 85% of the eastern Antarctic Peninsula's ice shelf perimeter has advanced since the early 2000s, linked to decade-scale changes in atmospheric circulation. The advance is due to more sea ice being carried to the coast by wind, which stabilises ice shelves.
Researchers deployed a fiber-optic-based sensing system to track sea ice formation in the Beaufort Sea, demonstrating a new method for near-real-time monitoring. The technology used distributed acoustic sensing (DAS) to observe changes in seismic waves caused by sea ice formation and break-up, providing insights into the Arctic's health.
A recent study reveals alarming levels of plastic pollution in the Arctic Ocean, affecting ecosystems and potentially exacerbating climate change. Plastic debris from rivers, air, and shipping has reached all spheres of the Arctic, including the seafloor, remote beaches, and even ice and snow.
A new study by University of Washington researchers explains why Antarctic sea ice retreats quickly during the summer months, finding that it follows simple rules of physics. The seasonal cycle is consistent, showing a fast retreat relative to slow growth.
A new study finds that immediate action to reduce methane emissions could preserve Arctic summer sea ice through 2100, with drastic cuts in CO2 also necessary. The chances of saving summer sea ice increase from nearly zero without action to over 80% if net zero CO2 emissions are reached by 2050.
A recent study using ICESat-2 data found that Arctic sea ice has lost 16% of its winter volume in just three years, with seasonal sea ice replacing thicker multiyear ice. This significant thinning trend is expected to continue, potentially leading to ice-free summers in the Arctic by mid-century.
A new project aims to determine the role of sea ice fragmentation in accelerating Arctic ice-cap retreat. By combining observations, theory, and process modeling, researchers hope to improve climate model accuracy.
Scientists have discovered Atlantic cod, armhook squid, and lanternfish in the deep waters of the Central Arctic Ocean, rewriting the understanding of this ecosystem. The findings suggest that these species can survive in Arctic temperatures and contribute to the food web.
A long-term study in the Southern Ocean shows a clear correlation between warming waters, decreased sea ice, and reduced abundance of Antarctic silverfish. The study suggests that these small fish are crucial prey for penguins, seals, and other regional marine life.
The MOSAiC expedition provides the first complete picture of climate processes in the central Arctic, warming twice as fast as the rest of the planet. Researchers analyzed environmental parameters over a full annual cycle, finding more dynamic and faster drifting pack ice than expected.
A new study by the Alfred Wegener Institute provides a basis for reliable projections of Antarctic sea-ice impacts under climate change. Ocean eddies are found to delay sea-ice loss, contrary to existing simulations, and allow the ocean to transport additional heat northward.
Researchers found that glaciers in the Northern Hemisphere lost a total area of 390 km² per year, with 60% attributed to the Greenland Ice Sheet. Only 3% of glaciers advanced during this period. The study highlights the impact of climate change on marine-terminating glaciers.
Researchers have found an unprecedented increase in winter stream flow rates over the last 25 years, with nearly 80% above average, driven by permafrost melt and forest fires. The combined effects of these factors are accelerating Arctic ice melt and exacerbating global warming.
A recent Ohio University study provides the first complete estimate of total Antarctic sea ice extent back through the 20th century, revealing unique changes in climate patterns. The research shows a regime shift with increases in sea ice since 1979 and sudden declines throughout the early and middle 20th century.
Researchers link dwindling Arctic sea ice to worsening wildfires in the Western United States, finding a previously unknown mechanism driving the connection. As sea ice melts, it warms surrounding areas, triggering heat and fire-favorable conditions in distant states.
A recent study found that polar bears in the Beaufort Sea are traveling up to 30% farther from their traditional hunting grounds, resulting in a 20% decrease in population. As sea ice recedes earlier and further, bears are being displaced from primary foraging habitats and forced to compete for food resources.
Researchers analyzed 131 scientific papers on penguin movement at sea to highlight the need for conservation and restoration of marine biodiversity. Penguins' use of areas beyond national jurisdiction varies by species, with some undertaking spectacular migrations.
A study by Brynn Kimber and team reveals killer whales spending more time in the Arctic due to reduced sea ice, posing new threats to prey species. The warmer climate is altering the predators' hunting patterns, leading to increased risks for endangered bowhead whales.
Researchers found polar bears can be used as indicators of environmental shifts, highlighting how changes affect marine mammal prey populations. They also discovered that polar bears are flexible eaters and will consume available prey, making them an ideal monitoring tool for tracking environmental changes.
A new study reconstructs Arctic sea ice levels and currents over 500 years using ancient driftwood, showing a distinct drop in tree arrivals since the 1990s. The research provides a unique look into past Arctic Ocean conditions, shedding light on the impact of climate change on this fragile ecosystem.
A new study documents the formation of a 3,000-square-kilometer rift in the oldest and thickest Arctic ice, indicating the Last Ice Area may not be as resilient to climate change as previously thought. The polynya is unusual due to its location off the coast of Ellesmere Island, where ice is up to five meters thick.
A new study warns that the Arctic Ocean's 'Last Ice Area,' a region where summer ice traditionally persists, may not survive the century. The study predicts that under high-emissions scenarios, summer ice will disappear by 2100, displacing creatures such as seals and polar bears.
The Copernicus Ocean State Report reveals record low Arctic ice levels, with a 90% reduction in average sea ice thickness in the Barents Sea. The report also highlights extreme variability in ocean temperatures and oxygen levels, posing significant challenges for marine ecosystems.
A research expedition discovered that higher waves in the Arctic Sea facilitate ice cloud formation through the dispersal of organic particles into the atmosphere. This finding is crucial for predicting climate change effects on the region.
A study on Antarctic jellyfish was conducted using footage from an amateur nature video. The research team identified 12 species, with two likely representing undescribed species. A machine learning training set for video annotation was also developed.
Researchers investigated the effects of atmosphere, sea ice, and ocean on August 2018 polynya formation. Thinnest sea ice cover and southerly wind played a crucial role in its development.
Researchers found a 12,000-year record of marine sediment cores in Antarctica showing fluctuations in sea ice levels affecting algae growth. Algal bloom events occurred nearly every year before 4,500 years ago, but became less frequent after 4.5 thousand years ago, responding to climate cycles like ENSO.
A new study finds that female walruses in the Chukchi Sea rely on biomarkers from algae growing within sea ice as a primary food source. The researchers tracked these markers using liver tissues from harvested animals, revealing a difference in foraging behavior between males and females.
Research by Lancaster University has found elevated levels of toxic chemicals, known as 'forever' chemicals, in the Arctic Ocean. These chemicals, used in products like stain-proof uniforms and non-stick pans, can accumulate in sea ice due to long-range transport from the atmosphere.
A new app under development uses AI to identify various kinds of sea ice in the Arctic, helping ship captains navigate icy waters and researchers better understand climate change. The app's accuracy improves with each user-submitted photo, making it a valuable tool for remote sensing of ice.
Researchers at the University of Washington found that summer sea ice in the Last Ice Area, a region north of Greenland and Canadian Arctic Archipelago, is declining due to global warming. The study suggests that this area may not be as resilient as previously thought, raising concerns for polar bears and walruses that rely on the ice.
A new UCL study finds that Arctic sea ice in coastal regions is thinning at a rate of 70% to 100% faster than previously thought. The study uses a novel snow model and satellite radar observations to estimate the overall rate of decline of sea ice thickness in the Arctic, with implications for human activity in the region.
A University of Maine-led study has uncovered new information about millennia of sea ice variability in the Southern Hemisphere by examining the chemistry of a 54,000-year-old South Pole ice core. The research reveals significant fluctuations in wintertime sea ice and an overall increase in ice cover throughout the Holocene.
A recent study published by University of Alaska Fairbanks researchers found that sea ice declined 5.7 times faster than normal during the Great Arctic Cyclone of 2016. The rapid decline was driven by cyclone-triggered processes within the ocean, including warm water upwelling and surface turbulence.
In 2020, the Arctic sea-ice extent was significantly lower than predicted by forecasting systems, with most institutions overestimating the coverage of sea ice. This highlights the ongoing challenge of accurately predicting Arctic sea-ice extent on subseasonal-to-seasonal time scales.
Climate change and pollution threaten narwhals, with mercury levels increasing significantly since the 1990s. The narwhal's tusk provides a window into changing conditions, revealing shifts in diet and exposure to pollutants over the past half century.
Researchers have obtained full-depth glacial meltwater observations in winter using instruments attached to tagged seals near the Pine Island Glacier. The study found a highly variable meltwater distribution with two meltwater-rich layers connected by scattered columns, which may change the melting rate of fragile ice shelves.
A new study shows that the Beaufort Sea freshwater release could impact the Atlantic Meridional Overturning Circulation, leading to significant changes in northern-hemisphere climate. The freshwater content has increased by 40% over the last two decades, with potential consequences for global climate patterns.