Timing of meltwater pulse 1a and climate responses to meltwater injections
Figure S1: Discrepancies between the U/Th and the raw 14C (radiocarbon conventional) chronologies are shown. (405.0Kb)
Stanford, Jennifer D.
Rohling, Eelco J.
Hunter, Sally E.
Roberts, Andrew P.
Rasmussen, Sune O.
McManus, Jerry F.
Fairbanks, Richard G.
MetadataShow full item record
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 δ 18O 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.
Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 21 (2006): PA4103, doi:10.1029/2006PA001340.
Suggested CitationArticle: Stanford, Jennifer D., Rohling, Eelco J., Hunter, Sally E., Roberts, Andrew P., Rasmussen, Sune O., Bard, Edouard, McManus, Jerry F., Fairbanks, Richard G., "Timing of meltwater pulse 1a and climate responses to meltwater injections", Paleoceanography 21 (2006): PA4103, DOI:10.1029/2006PA001340, https://hdl.handle.net/1912/3449
Showing items related by title, author, creator and subject.
Modern sedimentation in the Northern Barents Sea : input, dipersal and deposition of suspended sediments from glacial meltwater Pfirman, Stephanie L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1984-08)The modern depositional environment of the northern epicontinental Barents Sea varies from proximal to distal glaciomarine. The regional surface sediment distribution is controlled by erosion of shallow banks of the ...
Thieler, E. Robert; Butman, Bradford; Schwab, William C.; Allison, Mead A.; Driscoll, Neal W.; Donnelly, Jeffrey P.; Uchupi, Elazar (Elsevier B.V., 2007-01-04)The Hudson Shelf Valley (HSV) is the largest physiographic feature on the U.S. mid-Atlantic continental shelf. The 150-km long valley is the submerged extension of the ancestral Hudson River Valley that connects to the ...
Loose, Brice; Jenkins, William J. (John Wiley & Sons, 2014-04-16)The five inert noble gases—He, Ne, Ar, Kr, and Xe—exhibit a unique dissolved gas saturation pattern resulting from the formation and addition of glacial meltwater to seawater. He and Ne become oversaturated, and Ar, Kr, ...