The pace of climate change matters more than overall heat in the race to save key Atlantic currents, study finds
The rate of global warming, rather than the extra heat itself, could determine whether a system of ocean currents known as the Atlantic Meridional Overturning Circulation will cross a tipping point, new research suggests.
A new study reveals that the pace of climate change, not the amount of warming itself, is crucial in determining the fate of vital Atlantic Ocean currents. The Atlantic Meridional Overturning Circulation (AMOC) is a massive network of currents that transport heat to the Northern Hemisphere, influencing global climate patterns. While climate models indicate that slow warming can allow the AMOC to adapt and maintain strength even at temperatures exceeding 9°F (5°C) above preindustrial levels, rapid warming driven by high greenhouse gas emissions could trigger a tipping point at just 3.6°F (2°C) of warming.
The study, published in Nature Climate Change, involved running simulations with state-of-the-art climate models where atmospheric CO2 levels increased at varying rates. Under a slow CO2 rise of 0.5 ppm per year, the AMOC remained strong until up to 9.9°F (5.5°C) of warming. However, with faster warming rates of 2.5 ppm and 5 ppm per year, the AMOC collapsed when temperatures reached just 3.6°F (2°C).
The researchers emphasize that the rate of warming is more critical than the temperature increase alone, as it determines whether the AMOC can adapt or collapses. The findings suggest that climate policy should consider the rate of warming, as current strategies based on temperature thresholds may overlook this crucial factor.
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