Meltwater pulse 1A
Meltwater pulse 1A was an instance in the sea level rise of about 20 m in less than 500 years, perhaps just 200 years. The meltwater event occurred in a period of rapid climate change when the Holocene glacial retreat was going on during the end of the last ice age. Several researchers have narrowed the period of the pulse to between 13,000 and 14,600 years ago.
The pulse is framed historically between the Bølling-Allerød (B-A) interstadial and the Antarctic Cold Reversal/Older Dryas events. Intensive research points more toward a 200 year period about coincident with the later. Whether the pulse originated in the North or South, the event probably relates to the North Atlantic Deep Water thermohaline circulation which transports heat between the North Atlantic and the South Pacific. At different times research supported the pulse originating in the north or south but it is certain there was some component from both, and perhaps the majority coming from the north.
Recent modelling suggests that the collapse of the ice-sheet saddle between Canada and Greenland can explain the meltwater pulse.
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