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Timing of meltwater pulse 1a and climate responses to meltwater injections

Stanford, J.D., Rohling, E.J., Hunter, S.H., Roberts, A.P., Rasmussen, S.O., Bard, E., McManus, J. and Fairbanks, R.G. (2006) Timing of meltwater pulse 1a and climate responses to meltwater injections Paleoceanography, 21, (4), PA4103. (doi:10.1029/2006PA001340).

Record type: Article


The temporal relationship between meltwater pulse 1a (mwp-1a) and the climate history of the last deglaciation remains a subject of debate. By combining the Greenland Ice Core Project d18O ice core record on the new Greenland ice core chronology 2005 timescale with the U/Th-dated Barbados coral record, we conclusively derive that mwp-1a did not coincide with the sharp Bølling warming but instead with the abrupt
cooling of the Older Dryas. To evaluate whether there is a relationship between meltwater injections, North Atlantic Deep Water (NADW) formation, and climate change, we present a high-resolution record of NADW flow intensity from Eirik Drift through the last deglaciation. It indicates only a relatively minor 200-year weakening of NADW flow, coincident with mwp-1a. Our compilation of records also indicates that during Heinrich event 1 and the Younger Dryas there were no discernible sea level rises, and yet these periods were characterized by intense NADW slowdowns/shutdowns. Clearly, deepwater formation and climate are not simply controlled by the magnitude or rate of meltwater addition. Instead, our results emphasize that the location of meltwater pulses may be more important, with NADW formation being particularly sensitive to surface freshening in the Arctic/Nordic Seas.

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Published date: December 2006
Keywords: palaeoceanography, meltwater, thermohaline circulation, climate


Local EPrints ID: 42486
ISSN: 0883-8305
PURE UUID: 59203416-2358-4706-9134-034713296959
ORCID for E.J. Rohling: ORCID iD

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Date deposited: 11 Dec 2006
Last modified: 17 Jul 2017 15:21

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Author: J.D. Stanford
Author: E.J. Rohling ORCID iD
Author: S.H. Hunter
Author: A.P. Roberts
Author: S.O. Rasmussen
Author: E. Bard
Author: J. McManus
Author: R.G. Fairbanks

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