Meltwater pulse 1A
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.
Computer modelling, published in 2012, suggests that the collapse of the ice-sheet saddle between Canada and Greenland can explain the meltwater pulse. A 2014 study that examined dust released from melting icebergs onto the seabed of the Southern Ocean suggests a significant meltwater contribution from a collapse of Antarctic ice sheets.
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.
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- Stanford, Jennifer D.; Rohling, Eelco J.; Hunter, Sally E.; Roberts, Andrew P.; Rasmussen, Sune O.; Bard, Edouard; McManus, Jerry; Fairbanks, Richard G. (9 December 2006). "Timing of meltwater pulse 1a and climate responses to meltwater injections". Paleoceanography (American Geophysical Union) 21 (4): 4103. Bibcode:2006PalOc..21.4103S. doi:10.1029/2006PA001340.
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- Weber, Clark, Kuhn, Timmermann (5 June 2014). "Millennial-scale variability in Antarctic ice-sheet discharge during the last deglaciation". Nature (Nature Publishing Group) 510 (7503): 134–138. doi:10.1038/nature13397.
- Peltier, W.R. (26 April 2005). "On the hemispheric origins of meltwater pulse 1a". Quaternary Science Reviews (Elsevier Ltd.) 24 (14–15): 1655–1671. Bibcode:2005QSRv...24.1655P. doi:10.1016/j.quascirev.2004.06.023.
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