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According to this theory, the influx of fresh water shut down the normal cycle of the thermohaline circulation, effectively turning off that current system in a very short time. As we've mentioned, the thermohaline circulation brings warm, tropical waters northward towards the Arctic and sends cold, polar waters southward. A disruption of this flow would dramatically alter regional, and possibly even global, patterns of heat transfer. The theory claims that this shutdown temporarily plunged at least some parts of the Northern Hemisphere back into peak "ice age" conditions. Eventually, the flow from Lake Agassiz subsided, and the thermohaline circulation re-established itself.
A total shutdown of the ocean conveyor might lead to a big chill like the Younger Dryas, when icebergs appeared as far south as the coast of Portugal. Or the conveyor might only temporarily slow down, potentially causing an era like the "Little Ice Age," a time of hard winters, violent storms, and droughts between 1300 and 1850. That period's weather extremes caused horrific famines, but it was mild compared with the Younger Dryas.
Causes of the Younger Dryas
The prevailing theory holds that the Younger Dryas was caused by a significant reduction or shutdown of the North Atlantic thermohaline circulation in response to a sudden influx of fresh water from Lake Agassiz and deglaciation in North America. The global climate would then have become locked into the new state until freezing removed the fresh water "lid" from the north Atlantic Ocean. A recent alternative theory suggests instead that the jet stream shifted northward in response to the changing topographic forcing of the melting North American ice sheet, bringing more rain to the North Atlantic which freshened the ocean surface enough to slow the thermohaline circulation. Neither theory explains why South America cooled first.
Originally posted by superdebz
I dont know about an ice age but its deffo a sign that climate change is real
thank you skeptics.
Originally posted by triplescorpio
it appears this is going relatively ignored keep in mind its a hundred miles accross and thats the surface this is the size of where i live long isla takes three hour or so from one end to drive to the other a really really big ice cube roaming the ocean it should be center stage and its being totally overlooked
Sometimes, fissures and cracks may cause part of the shelf to break off; the largest known is about 31,000 km² (12,000 square miles), that is slightly larger than the size of Belgium. Iceberg B-15, the world's largest recorded iceberg, was calved from the Ross Ice Shelf during March 2000.