title: The deglacial evolution of North Atlantic deep convection.
abstract: Deepwater formation in the North Atlantic by open-ocean convection is an essential component of the overturning circulation of the Atlantic Ocean, which helps regulate global climate. We use water-column radiocarbon reconstructions to examine changes in northeast Atlantic convection since the Last Glacial Maximum. During cold intervals, we infer a reduction in open-ocean convection and an associated incursion of an extremely radiocarbon ((14)C)-depleted water mass, interpreted to be Antarctic Intermediate Water. Comparing the timing of deep convection changes in the northeast and northwest Atlantic, we suggest that, despite a strong control on Greenland temperature by northeast Atlantic convection, reduced open-ocean convection in both the northwest and northeast Atlantic is necessary to account for contemporaneous perturbations in atmospheric circulation.
authors.affiliation: School of Earth and Ocean Sciences, Cardiff University, Cardiff, CF10 3YE, UK. d.thornalley@cantab.net
authors.forename: David J R
authors.initials: DJ
authors.lastname: Thornalley
authors.forename: Stephen
authors.initials: S
authors.lastname: Barker
authors.forename: Wallace S
authors.initials: WS
authors.lastname: Broecker
authors.forename: Henry
authors.initials: H
authors.lastname: Elderfield
authors.forename: I Nick
authors.initials: IN
authors.lastname: McCave