AMOC — Kippt die Atlantische Meereszirkulation?
AMOC — Is the Atlantic Overturning Circulation Collapsing?
📌 Zusammenfassung
The Atlantic Meridional Overturning Circulation (AMOC) is one of Earth's most critical climate systems. It transports warm water from the tropics to the North Atlantic, keeping Europe significantly warmer than it would otherwise be. Recent science (2024-2026) indicates it is weakening and approaching a tipping point much earlier than previously assumed.
🔬 Wichtigste Erkenntnisse
- 1The AMOC has weakened approximately 15% since 1950s — more than any time in the last 1,000 years
- 2A 2025 PIK study found AMOC shuts down after 2100 in ALL high-emission model simulations
- 3Prof. Stefan Rahmstorf estimates collapse probability has risen from <10% to ~25% even under low emissions
- 4Tipping point could be reached as early as the 2050s-2060s according to recent projections
- 5An October 2024 open letter signed by 40+ scientists urged Nordic governments to prepare
- 6Iceland designated possible AMOC shutdown as a national security threat (Nov 2025)
- 7Consequences: European cooling of 5-15°C, 1m+ sea level rise on US East Coast, shifted tropical rain belts
- 8Greenland meltwater is freshening North Atlantic waters, further weakening the overturning — a feedback not fully captured in IPCC models
📚 Quellen & Weiterführende Links
🔗 Weiterführende Deep Dives
Globale Temperatur-Rekorde — Wo stehen wir?
2024 was the warmest year ever recorded, exceeding 1.5°C above pre-industrial levels for the first time. The last 10 years (2015-2024) were the 10 warmest on record. Despite La Niña cooling, 2025 remained the 3rd warmest year. The Paris Agreement's 1.5°C target is increasingly seen as breached.
Klima-Kipppunkte — Die kaskadenden Schwellen
The "Global Tipping Points Report 2025" (160 scientists, 23 countries) identifies critical thresholds that, once crossed, trigger self-reinforcing changes. Coral reefs have already tipped. Five more tipping points are at risk near 1.5°C: Greenland ice, West Antarctic ice, AMOC, Amazon rainforest, and permafrost.
Meeresspiegel-Anstieg — Küstenstädte in Gefahr
Global sea level is rising faster than at any point in the last 3,000 years. Current rate: ~4.5mm/year (doubling every ~25 years). Projections for 2100 range from 30cm (best case) to over 2m (worst case with ice sheet collapse). Major cities at risk: Mumbai, Shanghai, Miami, New York, Jakarta, Bangkok, Lagos, Tokyo.
Extremwetter — Die neue Normalität
Every additional 0.5°C of warming leads to clearly discernible increases in the frequency and severity of heat extremes, heavy rainfall events, and regional droughts (IPCC AR6). The world is already experiencing unprecedented heatwaves, wildfires, floods, and storms at 1.5°C.
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