AMOC Slowdown: Study Warns of 59% Collapse Risk by 2100, Threatens Indian Monsoon
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📌 Summary:
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A new study in Nature Climate Change warns that the Atlantic Meridional Overturning Circulation (AMOC) faces a 59% probability of collapse or significant slowdown by 2100 under high-emission scenarios
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What is AMOC: AMOC is a large system of ocean currents in the Atlantic Ocean that acts as a global heat conveyor — it transports warm surface water northward and cold deep water southward, regulating climate across Europe, North America, and tropical regions
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Mechanism of collapse: Rising global temperatures → Greenland ice sheet melting → influx of cold freshwater into North Atlantic → dilutes salinity → reduces water density → weakens the sinking motion that drives AMOC
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Impact on Indian monsoon: A weakened AMOC alters global atmospheric circulation patterns, potentially weakening the South Asian monsoon by reducing cross-equatorial moisture transport; India could see drier summers and altered rainfall distribution
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Other global impacts: Cooling of Europe (paradoxically); sea level rise on US East Coast; disruption of Sahel and Amazon rainfall patterns; altered Arctic sea ice dynamics
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India's specific vulnerability: ~600 million Indians depend on agriculture; monsoon supplies ~75% of India's annual rainfall; any 10-15% deficit in monsoon rainfall costs ~1.5% GDP growth
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Key data: Current AMOC strength is at its weakest in 1,000 years; last major slowdown (Younger Dryas, ~12,000 years ago) caused rapid 10°C cooling in Europe
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