Tag

Sea Ice

All articles tagged with #sea ice

environment7 days ago•15 min saved

Three-stage warming pushes Antarctic sea ice toward a tipping point

A Southampton-led study in Science Advances identifies a three-stage sequence behind Antarctic sea-ice collapse to record lows since 2015: warm Circumpolar Deep Water rising toward the surface, intensified mixing that rapidly melts ice (especially East Antarctica), and a self‑reinforcing cycle that prevents new ice from forming. The East Antarctica melt is ocean-heat-driven, while West Antarctica is amplified by cloud-driven warming. If this persistent low-ice state continues, the Southern Ocean could become a long‑term driver of global warming, with destabilized currents and potential impacts on sea level and climate.

via Oceanographic Magazine|

#antarctica #climate-change #environment

science11 days ago•92 min saved

Antarctica’s sea-ice melt: winds and deep heat rewrite the southern ocean story

A Science Advances study traces Antarctica’s sudden sea-ice collapse from 2013–2023 to a three-stage sequence in which stronger westerly winds first slosh cold, fresh surface waters away and uncover a deeper warm, salty layer, then mix that heat upward after 2015, and finally trigger self-reinforcing feedbacks that thin and delay sea-ice formation. The result has driven record-low sea-ice extent in 2023 and below-average extents in 2024–26, while threatening the Southern Ocean’s heat and carbon storage and disrupting ecosystems. Although the system has shifted to a new regime, scientists say a full collapse hasn’t occurred yet and future changes (like precipitation or glacier melt) could alter the trajectory.

via Live Science|

#antarctica #climate-change #oceanography

planet-earth29 days ago•64 min saved

Deep Ocean Heat Triggers Antarctica's Sudden Sea-Ice Decline

Antarctic sea ice began a rapid, decade-long decline around 2016 after a “violent release” of heat from the deep ocean. Argo floats tracked warming temperatures and salinity shifts, showing that deeper warmth, churned up by winds and a fresher surface layer, prevented ice formation and hindered recovery. The findings underscore the ocean’s key role in decadal sea-ice variability and have implications for adjacent ice shelves and potential sea-level rise, though the long-term trend remains negative as the climate continues to warm.

via Live Science|

#antarctica #argo-floats #climate-change

environment1 month ago•3 min saved

Emperor penguins endangered as Antarctic sea ice vanishes

An IUCN red list update moves emperor penguins from near threatened to endangered as climate-driven sea-ice loss triggers mass chick drownings and colony collapses, with the population expected to decline about 50% by the 2080s (to roughly 595,000 adults), highlighting broader Antarctic ecosystem stress including krill-dependent species such as fur seals.

via The Guardian|

#climate-change #emperor-penguin #environment

environment1 month ago•4 min saved

Arctic winter sea ice near record low as global heat records surge

Arctic sea ice reached its winter maximum at about 5.52 million square miles, roughly tying the lowest on record and about 525,000 square miles below the 1981-2010 winter average, signaling a steady decline as warming continues. The smaller ice pack means less sunlight reflected, allowing more heat to enter the oceans and potentially affect the summer melt and weather patterns. Antarctica meanwhile posted its coldest March day on record; melting sea ice does not raise sea levels, but the broader loss signals climate disruption with implications for ecosystems and shipping routes.

via NBC News|

#arctic #climate-change #environment

science3 months ago•7 min saved

Arctic bears adapt: Svalbard polar bears stay healthy despite melting ice

A Scientific Reports study of hundreds of Svalbard polar bears finds their body condition improved from 2000 to 2019 even as sea ice declined, suggesting dietary adaptation (more ringed seals and land prey like reindeer, plus scavenging) and regional variability among roughly 20 populations; while other regions like Western Hudson Bay show declines, climate change remains a major threat, and polar bears are not doomed everywhere.

via vox.com|

#arctic #climate-change #polar-bears

science4 months ago•3 min saved

Clouds Force Detour in Thwaites Expedition, Steering Researchers to Pine Island

Persistent low clouds kept helicopters grounded on Thwaites Glacier, so the icebreaker Araon rerouted to Pine Island Glacier to begin the season’s fieldwork, with teams testing sea ice, extracting ice cores, collecting seawater samples, calibrating equipment, and starting in-situ research amid a penguin sighting.

via The New York Times|

#antarctica #expedition #science

science5 months ago•5 min saved

Scientists warn of irreversible Antarctic changes and potential catastrophe

Australian scientists warn that Antarctica is experiencing rapid, irreversible climate changes, including shrinking sea ice, weakening ocean currents, and destabilizing ice sheets, driven by global warming. These changes threaten global sea levels and ecosystems, emphasizing the urgent need for deep emission cuts this decade to prevent irreversible damage.

via Earth.com|

#antarctica #climate-change #global-warming

science5 months ago•4 min saved

Massive Antarctic Sea Ice Hole Unveils Hidden Force

A massive hole in Antarctic sea ice, known as a polynya, was caused by complex interactions between wind, ocean currents, and salinity, revealing how localized ocean processes can have significant impacts on global climate and ocean circulation. The event, driven by Ekman-driven salt transport and deep convection, highlights the changing dynamics of the Southern Ocean in the context of climate change, with potential implications for heat and carbon exchange.

via Indian Defence Review|

#antarctica #climate-change #ocean-currents

science9 months ago•2 min saved

Scientists Warn of Catastrophic Consequences from Rapid Antarctic Ice Loss

Scientists warn that climate change is causing irreversible ice loss in Antarctica, which could lead to catastrophic environmental impacts, including accelerated warming, ecosystem collapse, and potential ice-free conditions in summer, with some effects possibly unavoidable even if emissions are reduced.

via DW|

#antarctica #climate-change #global-warming

environment9 months ago•33 min saved

Scientists Warn of Rapid and Abrupt Changes in Antarctica's Environment

Emerging evidence indicates abrupt environmental changes in Antarctica, including significant sea ice loss, ice sheet melting, and potential climate tipping points, driven by global warming and oceanic changes, with implications for sea level rise and ecosystem stability.

via Nature|

#antarctica #climate-change #environment

science9 months ago•2 min saved

Rapid Antarctic Ice Loss Signals Critical Climate Tipping Point

A scientific study warns that the rapid loss of Antarctic sea ice could be a critical climate tipping point, leading to irreversible effects such as sea level rise, altered ocean currents, and ecosystem damage, with some changes potentially continuing even if global warming is stabilized.

via Reuters|

#antarctica #climate-change #global-warming

environment9 months ago•4 min saved

Arctic Changes Threaten Global Climate Stability

A study published in Nature Climate Change reveals significant shifts in Antarctic phytoplankton communities over nearly three decades, driven by reduced sea ice and iron availability, leading to a decline in diatoms crucial for carbon sequestration. These changes threaten to disrupt the marine food web and accelerate global climate change by decreasing the ocean's ability to store carbon, highlighting the importance of long-term data collection in understanding climate impacts.

via The Daily Galaxy|

#antarctic #carbon-cycle #climate-change

science10 months ago•5 min saved

Ancient Mud Disproves 750,000-Year-Old Ice Theory

A new study challenges the long-held belief that a thick, permanent ice shelf once covered the Arctic, revealing instead that the region was characterized by seasonal sea ice over the past 750,000 years, allowing for open water and marine life even during cold periods, which has important implications for understanding past and future climate change.

via SciTechDaily|

#arctic #climate-change #ice-shelf

science10 months ago•6 min saved

Southward Shift in Ocean Circulation and Its Climate Impact

Recent measurements suggest a reversal in the salinity trend in the Southern Ocean around Antarctica, shifting from freshening to increased salinity, which complicates understanding of regional climate processes. While these changes are not large, they provide important clues about the complex interactions between sea ice, ocean circulation, and climate factors. The region's climate system is highly dynamic and challenging to model accurately, requiring integrated observations and advanced models to better predict future changes.

via RealClimate|

#antarctica #climate-change #ocean-salinity