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Southern Ocean

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Three-stage warming pushes Antarctic sea ice toward a tipping point
environment9 days ago

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
Deep Ocean Heat Triggers Abrupt Antarctic Sea Ice Decline
science10 days ago

Deep Ocean Heat Triggers Abrupt Antarctic Sea Ice Decline

Antarctic sea ice has plunged since 2015, with 2023 winter extents at record lows, surprising scientists and not fully anticipated by climate models. New research attributes the shift to rising deep-water heat that, once brought closer to the surface by winds and a weakened water-layer barrier, creates a self-reinforcing cycle that melts ice, lowers albedo, and could disrupt heat and carbon storage in the Southern Ocean. The change threatens Antarctic ecosystems (algae, krill, penguins) and could accelerate global warming rather than dampen it if low ice conditions persist.

via ScienceAlert|
#antarctic-sea-ice#climate-change#ocean-heat
Meltwater from Antarctic Giant Triggers South Atlantic Phytoplankton Bloom
earth-science2 months ago

Meltwater from Antarctic Giant Triggers South Atlantic Phytoplankton Bloom

A melting Antarctic iceberg, A-23A, released nutrient-rich meltwater as it drifted into warmer South Atlantic waters, fueling a large phytoplankton bloom detectable by NASA satellites (VIIRS on Suomi NPP and the PACE mission). Scientists say light conditions and nutrients from iceberg melt promote bloom formation, with implications for the marine food web and carbon cycling; the duration and full ecological impact remain under study.

via NASA Science (.gov)|
#earth-science#iceberg-a-23a#nasa-earth-observatory
West Antarctic Melt Might Dim Ocean Carbon Uptake, Study Finds
science3 months ago

West Antarctic Melt Might Dim Ocean Carbon Uptake, Study Finds

New research in Nature Geoscience shows that past West Antarctica ice retreat delivered iron to the Southern Ocean, but much of that iron was weathered and poorly soluble, so algae growth did not surge as expected; the study suggests continued WAIS thinning could reduce the ocean's CO2 uptake in the Pacific sector, revealing that the iron's chemical form, not just its amount, governs carbon drawdown.

via SciTechDaily|
#algae#carbon-dioxide-uptake#iron
Southern Ocean's Hidden Role in Climate Change Revealed
science7 months ago

Southern Ocean's Hidden Role in Climate Change Revealed

A study reveals that despite climate change predictions, the Southern Ocean continues to absorb CO2 due to increased freshwater input from melting glaciers and sea ice, which enhances water stratification and temporarily prevents deep water from releasing stored CO2. However, ongoing wind strengthening may soon disrupt this balance, potentially reducing the ocean's capacity to act as a carbon sink and accelerating climate change.

via SciTechDaily|
#carbon-sink#climate-change#ocean-circulation
Southward Shift in Ocean Circulation and Its Climate Impact
science10 months ago

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
Southern Ocean's Circulation Reverses, Signaling Climate Shift
science10 months ago

Southern Ocean's Circulation Reverses, Signaling Climate Shift

Researchers have discovered a historic reversal in the Southern Ocean's circulation, with increasing surface salinity and rising deep waters bringing heat and CO₂ to the surface, disrupting traditional ocean dynamics, accelerating ice melt, and potentially triggering significant global climate impacts similar to the collapse of the Atlantic Meridional Overturning Circulation.

via Cape Town ETC|
#climate-change#ocean-circulation#salinity
Southern Ocean's Changing State and Its Global Climate Impact
science10 months ago

Southern Ocean's Changing State and Its Global Climate Impact

A report claiming the reversal of the Deep Western Boundary Current (DWBC) and a catastrophic collapse of the Atlantic Meridional Overturning Circulation (AMOC) is false. The recent study discussed surface salinity changes in the Southern Ocean but did not indicate any reversal of ocean currents or system collapse. The claim of a current reversal is based on a misinterpretation and an erroneous press release, and experts clarify that there is no evidence of such an event occurring.

via Newsweek|
#amoc#climate-change#fact-check