Climate scientists cite Atlantic Meridional Overturning Circulation (or AMOC) among the major points on the way to planetary climate catastrophe. The Atlantic Ocean acts as a conduit for hot and cold hot water in the north, with the heaviest water in the south. An associate scientist at UW-Madison’s Center for Climatic Research.However, building upon previous work, He says researchers are revising their understanding of the relationship between AMOC and fresh water from melting polar ice
Earlier, AMOC stood in tune with emergency weather conditions such as the Bølling-Allerød warming, which is 14,500 years old, a sharp rise in global temperatures. He successfully reprinted the event using a climate model he did in 2009 when he was a UW-Madison graduate student “But our accuracy did not go beyond that moment of urgent change.”
Melting
Instead, while global temperatures were cooling after this sudden warming before rising again to the highest plateau 10,000 years ago, the 2009 model could not keep up with the pace. Simulated temperatures in the northern hemisphere did not correspond to the increase in temperatures observed in archives, such as ice cores. In a study published this week in the journal Nature Climate Change, he and Oregon State University paleoclimatologist Peter Clark describe a new parallel to warmth 10,000 years ago. And they have done so by removing the bullet of many scientists who believe it is stable or closing the AMOC.
Global warming causes sea ice of the Arctic Ocean and the Greenland Ice Sheet to melt, releasing freshwater into the sea. Scientists strongly believe that the flow of freshwater disrupts population density in the North Atlantic that causes water from the north of the AMOC to sink and return to the south. ” “The problem is related to geological climate data. showing the abundance of fresh water from the last melting of ice in North America and Europe, the AMOC has not changed. Thus, He removed the thought of a flood of pure water from His model.
Global warming from Carbon Dioxide
“Unless pure water comes to make AMOC slow down the model, we get to emulate a better, more permanent agreement with the temperature data from the weather record,” he says. “An important result is that AMOC appears to be less resistant to forcing clean water than previously thought, according to both data and the model.” This is especially important for climate models that test how AMOC will respond to future freshwater growth. from the snow melts. “Built on many models,” he said. “The coming global warming resulting from the rise of carbon dioxide in the atmosphere is melting seawater, and freshwater from melting ice is believed to be causing AMOC to weaken.”
The widespread effects of AMOC’s massive decline include raise of sea levels along the northeast coast of North America, cooling over Europe that could disrupt agriculture, the Amazon rain forest and the disruption of Asian vegetation. The new modeling study expects a very small reduction in AMOC power, but that does not mean it can fluctuate quickly. “We cannot be sure why AMOC was shut down in the past. But we are sure it did. And it could change again.”
Source Journal Reference:Feng He, Peter U. Clark. Freshwater forcing of the Atlantic Meridional Overturning Circulation revisited. Nature Climate Change, 2022; DOI: 10.1038/s41558-022-01328-2
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