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Atlantic 'cold blob' linked to weakening ocean current system nearing a tipping point, study finds
Researchers found the cooling tracks reduced ocean heat transport, and the study says surface heat loss has not increased.
A study published in Geophysical Research Letters in May links the North Atlantic 'cold blob' to a weakening Atlantic Meridional Overturning Circulation , suggesting this major ocean system is slowing.
Known as the 'cold blob' or 'warming hole,' this area of unusually cold water southeast of Greenland remains out of step with global trends, likely due to reduced heat transport from a weakening ocean conveyor.
Freshwater from melting Greenland ice reduces water density, hindering the sinking process that keeps the AMOC moving, which the Intergovernmental Panel on Climate Change notes influences North Atlantic weather patterns.
Researchers estimate that AMOC weakening accounts for 20 to 50 percent of the increase in flood days along the United States Northeast coast since 2005, with rising sea levels as a major concern.
While the new study does not suggest an imminent AMOC collapse, researchers view the 'cold blob' as a significant indicator of potential instability, as continued decline in Atlantic heat transport could disrupt future agricultural cycles.