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Ocean Currents

All articles tagged with #ocean currents

Atlantic circulation could weaken by 51% by 2100, reshaping coasts and climates
science27 days ago

Atlantic circulation could weaken by 51% by 2100, reshaping coasts and climates

A new study projects the Atlantic Meridional Overturning Circulation (AMOC) to weaken about 51% by 2100—roughly 60% more than standard models predict—after correcting biases in simulations. Such a weakening could raise U.S. Northeast sea levels, shift tropical rainfall belts, and usher colder European winters, with a growing risk of crossing a tipping point toward collapse. Observations indicate a 10–20% weakening since the mid-2000s, and while attribution to human-caused climate change remains uncertain for now, scenarios with strong CO2 cuts could limit the decline much more than high-emission futures.

via BBC Science Focus Magazine|
#amoc#climate-change#ocean-currents
Atlantic circulation on the brink: new study suggests AMOC weakening near tipping point
planet-earth1 month ago

Atlantic circulation on the brink: new study suggests AMOC weakening near tipping point

A Science Advances study estimates the Atlantic Meridional Overturning Circulation (AMOC) could slow about 50% by 2100—a weakening stronger than some models predicted—potentially cooling northern Europe and altering rainfall in various regions. The researchers argue that including sea surface temperature and salinity improves forecasts, but experts caution there is substantial uncertainty in the magnitude and timing of the slowdown. While a catastrophic “collapse” is unlikely in the near term, the paper underscores a real risk of crossing a tipping point, prompting calls for nations to prepare for significant climate effects.

via Live Science|
#amoc#atlantic-ocean#climate-change
Earth’s Longest Creature Is a Brainless, Boneless Jellyfish With 1,200 Tentacles
science2 months ago

Earth’s Longest Creature Is a Brainless, Boneless Jellyfish With 1,200 Tentacles

The lion’s mane jellyfish (Cyanea capillata) is the longest known animal, with a bell up to about 2.1 meters and tentacles that can extend over 36 meters, longer than any other animal on Earth, though it has almost no mass compared with a blue whale. It is brainless and boneless, made mostly of seawater (~94%), and drifts with currents while its thousands of tentacles form a wide hunting net; the nematocysts on its tentacles fire in under 700 nanoseconds. This long-tentacled strategy is energetically cheap in cold Arctic waters, though it reduces propulsion efficiency by up to 80–90%. The species’ blooms are studied as indicators of ocean health and warming, contrasting with the blue whale’s massiveness but highlighting a different kind of “largest”—reach versus weight.

via Yahoo|
#cyanea-capillata#lions-mane-jellyfish#nematocysts
Southern Indian Ocean Freshening Could Redraw Global Climate Currents
science3 months ago

Southern Indian Ocean Freshening Could Redraw Global Climate Currents

New research shows the Southern Indian Ocean has become dramatically less salty over six decades, with salinity down about 30% due to wind-driven freshwater inflows from the Indo-Pacific pool. The resulting lighter, less dense water weakens deep ocean mixing, potentially disrupting the global thermohaline circulation and altering climate patterns beyond the region, with possible impacts on marine ecosystems.

via The Daily Galaxy|
#climate-change#ocean-currents#salinity
Rare Hoodwinker Sunfish Emerges on California Shore, Redrawing Its Range
environment3 months ago

Rare Hoodwinker Sunfish Emerges on California Shore, Redrawing Its Range

A rare hoodwinker sunfish, Mola tecta, washed ashore at Doran Regional Park during a Northern California beach cleanup, a finding that challenges assumptions about the species’ range. Described in 2017 and distinct from the common mola, its presence off the U.S. West Coast hints at wider, less-understood migrations, while strandings provide scientists with data on movement and currents; observers are urged to document sightings from a distance and report to wildlife authorities.

via Iowa Park Leader|
#california-coast#environment#hoodwinker-sunfish
Massive Antarctic Sea Ice Hole Unveils Hidden Force
science5 months ago

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
North Atlantic Ocean Currents Show Signs of Critical Instability, Threatening Climate Stability
science7 months ago

North Atlantic Ocean Currents Show Signs of Critical Instability, Threatening Climate Stability

Scientists studying ancient clam shells have found evidence suggesting the Atlantic Ocean is nearing a critical tipping point in its current systems, which could lead to significant climate disruptions globally. The study highlights two destabilization episodes in the past 150 years, with current signs indicating increased instability, emphasizing the importance of reducing greenhouse gas emissions to prevent severe climate impacts.

via BBC Wildlife Magazine|
#atlantic-ocean#climate-change#marine-shells
North Atlantic Ocean Currents Show Signs of Critical Instability Threatening Global Climate
environment7 months ago

North Atlantic Ocean Currents Show Signs of Critical Instability Threatening Global Climate

A recent study using clam shell growth rings confirms that climate change is disrupting the North Atlantic subpolar gyre, a key ocean current system, which could lead to significant regional and global climate impacts, including more extreme weather, sea level rise, and shifts in ocean heat transport, signaling potential irreversible tipping points in Earth's climate systems.

via Inside Climate News|
#climate-change#environment#marine-science
Scientists Warn of Imminent Collapse of Atlantic Ocean Currents
science8 months ago

Scientists Warn of Imminent Collapse of Atlantic Ocean Currents

A new study warns that the collapse of the Atlantic Meridional Overturning Circulation (AMOC), a crucial ocean current system, is more likely than previously thought, potentially occurring within the next 50 to 100 years due to human-caused pollution, with the tipping point possibly reached in the next 10 to 20 years, posing serious global climate risks.,

via yahoo.com|
#amoc#climate-change#environmental-impact
Urgent Warning: Collapsing Atlantic Currents Threaten Global Climate Stability
science8 months ago

Urgent Warning: Collapsing Atlantic Currents Threaten Global Climate Stability

A new study warns that human-caused pollution could cause the Atlantic Meridional Overturning Circulation (AMOC) to collapse within the next 50 to 100 years, with the tipping point possibly occurring in the next 10 to 20 years, posing severe global climate risks. Urgent action to reduce emissions is necessary to prevent catastrophic environmental consequences, including colder Europe, disrupted weather patterns, and rising sea levels.

via The Cool Down|
#amoc#climate-change#environmental-impact
Urgent Warning: Atlantic Ocean Current May Collapse Within a Generation
science8 months ago

Urgent Warning: Atlantic Ocean Current May Collapse Within a Generation

A new physics-based indicator suggests that the Atlantic Meridional Overturning Circulation (AMOC) could collapse as early as 2023 under high-emission scenarios, with a median predicted collapse around 2055, potentially leading to drastic climate changes in Northwestern Europe. Urgent climate action and reduced emissions are necessary to mitigate this risk.

via Phys.org|
#amoc#climate-change#global-warming