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That is one of his pet theories....He thinks that melting ice caused the Younger Dryas period, but there is no evidence for that or several other possible causes of that event. https://geosciencesocietysio.wordpre...r-dryas-event/
Quote:
Current consensus on the origin of Younger Dryas event, hypothesized by Broecker et al. (1989), is that the reduction in AMOC strength during the Younger Dryas, provided the causal mechanism for Northern Hemisphere cooling and Southern Hemisphere warming, as well as the southward displacement of the ITCZ (Intertropical Convergence Zone) (Carlson 2013). Weakening of AMOC is popularly attributed to a significant influx of freshwater reaching the North Atlantic Ocean, which reduces surface water salinity and thus seawater density. This inhibits the region where North Atlantic Deep Water (NADW) forms in thermohaline circulation and triggers changes in ocean circulation, resulting in widespread climate change (Broecker 1989).
The paper goes on to say that a flood is currently being ruled out because they can't find the path it must have taken.
But the expected result of a large influx of fresh water is as stated. And destabilizing the Greenland Ice Sheet would provide that kind of event.
But if it goes then it would be very unlikely to be gradual. The mechanism that is at work is the calving face of the Illulissat Glacier is moving inland from the edge of the glacier. As it does this the linear length of the caving face is going up. This should accelerate the flow. This puts the ice loss on an exponential growth curve.
Actually I don't think it would, and even if it did there is no evidence that supports your theory.
In the book by Lamb the 1995 edition. about page 62 they talked about an event where an increased influx of fresh water reduced artic temperatures in the vicinity of the water. That is why the expectation of a large influx of fresh water is colder. It has been observed to do so.
In the book by Lamb the 1995 edition. about page 62 they talked about an event where an increased influx of fresh water reduced artic temperatures in the vicinity of the water. That is why the expectation of a large influx of fresh water is colder. It has been observed to do so.
You do know that calved ice (Icebergs) travel south right? They have been seen as far south as Bermuda, so their melt water would be distributed over many miles.
You do know that calved ice (Icebergs) travel south right? They have been seen as far south as Bermuda, so their melt water would be distributed over many miles.
Yep. And you know how big the ice sheet is? An exponential ice flow curve is not something you want to play with.
If only we knew ourselves better. Dunning believes people's inability to assess their own knowledge is the cause of many of society's ills, including climate change denialism. "Many people don't have training in science, and so they may very well misunderstand the science. But because they don't have the knowledge to evaluate it, they don't realize how off their evaluations might be," he said.
Moreover, even if a person has come to a very logical conclusion about whether climate change is real or not based on their evaluation of the science, "they're really not in a position to evaluate the science."
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One of the biggest problems with having discussions like these is people tend to assume that all of these terms fit into one of two all-encompassing categories. They don't.
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