01373nas a2200193   4500000000100000008004100001260000800042100002100050700001900071700002100090700001800111700001700129245006300146856004800209300002000257490000800277520088000285022001401165       2011                            d  cjan1 aDavid Thornalley1 aStephen Barker1 aWallace Broecker1 aH. Elderfield1 aNick. McCave00aThe deglacial evolution of North Atlantic deep convection.  uhttp://www.ncbi.nlm.nih.gov/pubmed/21233385  a202\textendash50 v3313 a<p>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.</p>  a1095-9203