@article {371, title = {Interhemispheric Atlantic seesaw response during the last deglaciation}, journal = {Nature}, volume = {457}, year = {2009}, note = {id: 856; Barker, Stephen Diz, Paula Vautravers, Maryline J Pike, Jennifer Knorr, Gregor Hall, Ian R Broecker, Wallace S England Nature. 2009 Feb 26;457(7233):1097-102.Y}, pages = {1097-102}, abstract = {The asynchronous relationship between millennial-scale temperature changes over Greenland and Antarctica during the last glacial period has led to the notion of a bipolar seesaw which acts to redistribute heat depending on the state of meridional overturning circulation within the Atlantic Ocean. Here we present new records from the South Atlantic that show rapid changes during the last deglaciation that were instantaneous (within dating uncertainty) and of opposite sign to those observed in the North Atlantic. Our results demonstrate a direct link between the abrupt changes associated with variations in the Atlantic meridional overturning circulation and the more gradual adjustments characteristic of the Southern Ocean. These results emphasize the importance of the Southern Ocean for the development and transmission of millennial-scale climate variability and highlight its role in deglacial climate change and the associated rise in atmospheric carbon dioxide.}, issn = {1476-4687 (Electronic) 0028-0836 (Linking)}, doi = {10.1038/nature07770}, author = {Barker, S. and Diz, P. and Vautravers, M. J. and Pike, J. and Knorr, G. and Hall, I. R. and Broecker, W. S.} } @article {392, title = {Reply to comment by L. D. Stott on "Anomalous radiocarbon ages for foraminifera shells": A correction to the western tropical Pacific MD9821-81 record}, journal = {Paleoceanography}, volume = {22}, year = {2007}, note = {id: 2015; PT: J; UT: WOS:000244478900002}, pages = {PA1212-PA1212}, issn = {0883-8305}, doi = {10.1029/2006PA001393}, author = {Broecker, W. S. and Barker, S.} } @article {1957, title = {The mystery interval 1.5 to 14.5 kyrs ago}, journal = {Pages News}, volume = {14}, year = {2006}, note = {id: 701}, month = {2006}, pages = {14-16}, author = {Denton, G. H. and Broecker, W. S. and Alley, R. B.} } @article {776, title = {How much deep water is formed in the Southern Ocean?}, journal = {Journal of Geophysical Research-Oceans}, volume = {103}, year = {1998}, note = {Zz547Times Cited:115Cited References Count:44}, month = {Jul 15}, pages = {15833-15843}, abstract = {Three tracers are used to place constraints on the production rate of ventilated deep water in the Southern Ocean. The distribution of the water mass tracer PO4* ("phosphate star") in the deep sea suggests that the amount of ventilated deep water produced in the Southern Ocean is equal to or greater than the outflow of North Atlantic Deep Water from the Atlantic. Radiocarbon distributions yield an export flux of water from the North Atlantic which has averaged about 15 Sv over the last several hundred years. CFC inventories are used as a direct indicator of the current production rate of ventilated deep water in the Southern Ocean. Although coverage is as yet sparse, it appears that the CFC inventory is not inconsistent with the deep water production rate required by the distributions of PO4* and radiocarbon. It has been widely accepted that the major part of the deep water production in the Southern Ocean takes place in the Weddell Sea. However, our estimate of the Southern Ocean ventilated deep water flux is in conflict with previous estimates of the flux of ventilated deep water from the Weddell Sea, which lie in the range 1-5 Sv. Possible reasons for this difference are discussed.}, doi = {10.1029/98jc00248}, author = {Broecker, W. S. and Peacock, S. L. and Walker, S. and Weiss, R. and Fahrbach, E. and Schroeder, M. and Mikolajewicz, U. and Heinze, C. and Key, R. and Peng, T. H. and Rubin, S.} } @article {833, title = {Radiometrically determined sedimentary fluxes in the sub-polar North Atlantic during the last 140,000 years}, journal = {Earth and Planetary Science Letters}, volume = {155}, year = {1998}, note = {Ze160Times Cited:70Cited References Count:55}, month = {Feb 15}, pages = {29-43}, abstract = {We have examined the record of sediment input during the last 140000 years in a deep-sea core from 49 degrees 27{\textquoteright}N, 22 degrees 16{\textquoteright}W in the eastern North Atlantic. Using uranium-series disequilibria to constrain time, we have calculated mass fluxes of total sediment, as well as mass and particle fluxes of major sedimentary components. Sediment accumulation rates were generally lower and relatively constant during broadly defined interglacial intervals, driven primarily by the burial of biogenic material. Accumulation rates were higher and more variable during glacial intervals, and were influenced primarily by terrigenous material. Peaks in bulk mass fluxes were associated with particular episodes (Heinrich events) within the last glacial and during each of the last two deglaciations. The flux of ice-rafted debris, as uniquely identified by coarse detrital fragments, was higher during layers representing each of the glacial Heinrich events, with modest increases during events H3 and H6 and dramatic increases during the others, confirming the widespread interpretation of these layers as episodes of enhanced iceberg delivery. The burial flux of foraminifera was markedly lower during each of the glacial Heinrich events, also confirming the original identification of these layers as barren intervals. Ice-rafting events within marine isotope stage 5 left neither a large detrital nor biogenic flux imprint at our study site. Variations in the burial rates of non-carbonate sediments were largely responsible for overall changes in sediment accumulation throughout the last climate cycle. Ice-rafting was apparently an important delivery mechanism for this terrigenous material. The instantaneous chronometer established here for the last 140000 years in the subpolar North Atlantic allows the transformation of existing and subsequent data from relative values to absolute burial fluxes. (C) 1998 Elsevier Science B.V.}, issn = {0012-821x}, doi = {10.1016/S0012-821x(97)00201-X}, author = {McManus, J. F. and Anderson, R. F. and Broecker, W. S. and Fleisher, M. Q. and Higgins, S. M.} } @article {754, title = {High-Resolution Climate Records from the North-Atlantic during the Last Interglacial}, journal = {Nature}, volume = {371}, year = {1994}, note = {Ph254Times Cited:313Cited References Count:25}, month = {Sep 22}, pages = {326-329}, abstract = {THE two deep ice cores recovered by the GRIP(1) and GISP(2) projects at Summit, Greenland, agree in detail over the past 100,000 years(3) and demonstrate dramatic climate variability in the North Atlantic region during the last glacial, before the current period of Holocene stability. This glacial climate instability has subsequently been documented in the marine sedimentary record of surface-ocean conditions in the North Atlantic(4). Before 100 kyr ago the two ice core records are discrepant, however, casting doubt on whether the oxygen isotope fluctuations during the last interglacial (Eemian) seen in the GRIP core(1,5) represent a true climate signal. Here we present high-resolution records of foraminiferal assemblages and ice-rafted detritus from two North Atlantic cores for the interval 65 kyr to 135 kyr ago, extending the surface-ocean record back to the Eemian. The correlation between our records and the Greenland ice-core records is good throughout the period in which the two ice cores agree, suggesting a regionally coherent climate response. During the Eemian, our marine records show a more stable climate than that implied by the GRIP ice core, suggesting that localized phenomena may be responsible for the variability in the latter record during the Eemian.}, issn = {0028-0836}, doi = {10.1038/371326a0}, author = {McManus, J. F. and Bond, G. C. and Broecker, W. S. and Johnsen, S. and Labeyrie, L. and Higgins, S.} }