Atlantic Cold Blob Cools Nearly 1C Since 1900 as AMOC Instability Deepens
Updated
Updated · The Week · Jun 22
Atlantic Cold Blob Cools Nearly 1C Since 1900 as AMOC Instability Deepens
3 articles · Updated · The Week · Jun 22
Summary
Nearly 1C of cooling since 1900 has made the Atlantic “cold blob” south of Greenland the only region to cool significantly since the 19th century, according to a new study.
Data back to 1870 link that anomaly to a weakening Atlantic Meridional Overturning Circulation, with heat loss to the atmosphere falling over the past half-century and the sharpest heat-content drop in the upper 1,000 meters.
Human-driven warming is believed to be destabilizing the current system by melting ice and adding freshwater, raising the risk that the AMOC could weaken enough to stop redistributing heat effectively.
That shift is already being tied to disrupted weather patterns, including a 24.6% increase in monsoon rain in northwest India and a 4.4% decline over the Indo-Gangetic Plain since 1999.
A full AMOC collapse could bring much colder winters to northern Europe, faster sea-level rise along the U.S. East Coast and stronger Atlantic storms.
Could a vital Atlantic current collapse within a decade, triggering irreversible climate chaos for the entire world?
Will the Atlantic's 'cold blob' paradoxically accelerate global warming by releasing vast amounts of trapped ocean carbon?
With conflicting scientific data, how can we know if the world's 'great conveyor belt' is truly nearing a catastrophic shutdown?
Atlantic Cold Blob and AMOC Weakening: Early Warning Signs of a Looming Climate Tipping Point
Overview
The Atlantic Ocean is showing a striking cold blob—a region that has cooled by nearly 1°C since 1900, even as most oceans warm. This unusual cooling stands out and signals bigger changes in the Atlantic’s climate system, especially its connection to the weakening Atlantic Meridional Overturning Circulation (AMOC). Recent studies reveal that rapid Arctic warming reduces the temperature difference between the pole and tropics, causing the jet stream’s strong westerly winds to shift north. This shift draws more heat from the ocean, helping the cold blob persist and highlighting the complex links between ocean and climate change.