AMOC Overview and Function

• Atlantic Meridional Overturning Circulation (AMOC) transports warm water from equator to poles
• Keeps North Atlantic water warm, warming air above
• Major reason middle/Northern Europe has mild temperatures
• AMOC collapse would drop European temperatures 5-10°C on average

Global Impact of AMOC Collapse

• Not solely European problem - globally shifts precipitation patterns
• Higher temperatures near equator
• More rain in Australia (uncertain predictions)
• Plants/animals would find themselves in wrong climate zones

IPCC Assessment (2019)

• AMOC will "very likely weaken" over 21st century with "high confidence"
• Collapse is "very unlikely" with "medium confidence"
• Estimated ~10% probability with large spread (0-50% range)

New Evidence Since 2019

Temperature Fluctuation Analysis (2023 Paper)

• Studied Atlantic Ocean temperature fluctuations
• Systems near critical point show extreme deviations from average temperature
• Correlations between temperature variations increase
• Similar behavior observed in stock markets before crashes, Bose-Einstein condensates
• Authors conclude AMOC approaching critical point
• Estimated collapse around mid-century under current emission scenarios

Salt Content Conditions

• AMOC requires high salt content in northern surface water
• Low salt content prevents water from sinking, disrupting circulation
• Arctic/Greenland ice melting adds fresh water, diluting salt content
• Salt content measurably dropping
• Climate models used by IPCC don't properly account for this factor

Recent Assessment (Not Yet Peer-Reviewed)

• "Circulation collapses in all IPCC class climate models in high emission scenarios"
• Collapse occurs even in some moderate/low scenarios
• Most models neglect increasing Greenland meltwater influx
• Collapse initiated by breakdown of deep convection early this century
• Conclusion: "AMOC collapse can't be considered low probability event anymore"

Regional Climate Effects

• Warm water/air flow shifts further south
• More cold air in middle/Northern Europe
• More heat waves in southern Europe
• Full consequences take decades to develop
• Northern Europe temperatures could drop 10°C on average

Germany-Specific Impact

• Temperature drop from AMOC collapse might offset 3-5°C increase from climate change
• Average temperatures might balance out
• More extreme cold/heat events expected
• Extremes don't average out (analogy: punched in head from both sides)

Overall Assessment

• Europe inching closer to new Ice Age with every ton of CO2 emitted
• Regional ice age rather than global event