Weakening of the Atlantic Meridional Overturning Circulation driven by subarctic freshening since the mid-twentieth century - this circulation could be 33% weaker under 2 °C of global warming, which could be reached over the coming decade
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#ClimateChange #AMOC #GlobalWarming #OceanCirculation #EnvironmentalImpact
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Nature
Weakening of the Atlantic Meridional Overturning Circulation driven by subarctic freshening since the mid-twentieth century
Nature Geoscience - Fresh meltwater entering the Labrador and Irminger seas has resulted in a slowing of the Atlantic Meridional Overturning Circulation since the 1950s, according to a combination...
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A recent study has analyzed the Atlantic Meridional Overturning Circulation (AMOC) using computer models and found no evidence of a long-term weakening over the past 60 years.
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#AMOC #ClimateChange #OceanCirculation #ResearchStudy #EnvironmentalScience
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Woods Hole Oceanographic Institution
New study finds that critical ocean current has not declined in the last 60 years
Atlantic Meridional Overturning Circulation (AMOC) helps to regulate the Earth’s climate and weather
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Direct ocean measurements confirm a consistent decline in the Atlantic Meridional Overturning Circulation (AMOC) over 20 years. Sensors from the Caribbean to Canada reveal a weakening trend in deep currents that regulate European and North American climates.
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#AMOC #Oceanography #ClimateChange
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Science Advances
Meridionally consistent decline in the observed western boundary contribution to the Atlantic Meridional Overturning Circulation
Western boundary observations in the Atlantic suggest a meridionally consistent decline in the ocean overturning circulation.
The AMOC ocean current could weaken by 51% by 2100—far more than the 32% previously predicted. A new study uses observational data to show we are closer to a "critical state" that could trigger a full shutdown of the system.
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Science Advances
Observational constraints project a ~50% AMOC weakening by the end of this century
Combining observations and climate models suggests a 60% stronger weakening of the Atlantic circulation than using models alone.
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The mysterious "cold blob" in the North Atlantic is caused by a weakening AMOC ocean current, a new study confirms. Deep-water data proves this cooling isn't an atmospheric fluke, signaling a shift toward a major climate tipping point.
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#AMOC #NorthAtlantic #ClimateChange
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AGU Journals
Multidecadal Atlantic “Warming Hole” Heat Content Variations Are Caused by Ocean Heat Transport, Not by Surface Fluxes
The “warming hole” or “cold blob” in the northern Atlantic represents a full-depth heat content decline
The region of declining heat content does not correspond to an area of increasing surface h...
The region of declining heat content does not correspond to an area of increasing surface h...
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New climate model suggests Greenland meltwater and atmospheric warming will gradually weaken the AMOC by up to 80% rather than trigger an abrupt collapse, with the ocean current fully recovering by 2400 if global CO2 emissions are reversed.
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Science Advances
Limited impact of Greenland meltwater on abruptness and reversibility of future Atlantic overturning changes
Climate model simulations show the Atlantic overturning circulation can recover even from strong future Greenland ice sheet melt.
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Climate modeling suggests the AMOC may not have a fixed temperature threshold for collapse: it remained stable beyond 5°C under slow warming but collapsed around 2°C under faster warming, indicating that the rate of climate change can strongly influence its stability.
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Nature
Failure to track a stable AMOC state under rapid climate change
Nature Climate Change - Climate change is expected to alter oceanic circulation, with the Atlantic Meridional Overturning Circulation (AMOC) at risk of collapse. This work shows that the stability...
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