In the popular film “The Day After Tomorrow,” global weather patterns spiral into chaos following a sudden shutdown of a crucial Atlantic Ocean current. The movie depicts catastrophic events including tornadoes in Los Angeles, coastal flooding in New York, and a deep freeze enveloping the Northern Hemisphere, instantly fatal to those exposed to the frigid air.
While the movie falls into the genre of climate fiction known as cli-fi, its storyline is loosely grounded in scientific theory. The focus is on the Atlantic Meridional Overturning Circulation (AMOC), a key ocean current system responsible for redistributing warm waters from the southern Atlantic to the northern regions, influencing Europe’s relatively mild climate compared to locations at similar latitudes.
Concerns arise regarding the potential collapse of the AMOC due to the impacts of climate change. As greenhouse gas emissions continue to warm the planet, ocean temperatures rise, affecting the functioning of the AMOC. The process of warm water moving northward, cooling, sinking, and circulating back southward is being disrupted by rising sea surface temperatures and decreased salinity in parts of the Atlantic.
Studies diverge on the extent of the potential AMOC slowdown. Recent research, indicating a possible 50% slowdown by 2100, suggests a more pronounced impact than previously estimated. While uncertainties persist, the likelihood of a significant AMOC slowdown is increasingly acknowledged by scientists.
The consequences of an AMOC slowdown include changes in global temperatures, altered weather patterns, and potential sea level rise. While the scenario may not lead to the extreme events portrayed in “The Day After Tomorrow,” the impacts on Europe and North America could still be substantial, with colder temperatures and disrupted weather patterns.
As global temperatures continue to rise, with projections exceeding the 1.5°C threshold set by the Paris Agreement, the potential implications of an AMOC slowdown underscore the urgent need for climate action. Scientists emphasize the importance of understanding and addressing the risks associated with AMOC changes for future generations.