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Benway, Heather M; McManus, Jerry F; Oppo, Delia W; Cullen, James L (2010): (Table 1) Age determination of ODP Site 162-980. PANGAEA,, Supplement to: Benway, HM et al. (2010): Hydrographic changes in the eastern subpolar North Atlantic during the last deglaciation. Quaternary Science Reviews, 29(23-24), 3336-3345,

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Millennial-scale climate fluctuations of the last deglaciation have been tied to abrupt changes in the Atlantic Meridional Overturning Circulation (MOC). A key to understanding mechanisms of MOC collapse and recovery is the documentation of upper ocean hydrographic changes in the vicinity of North Atlantic deep convection sites. Here we present new high-resolution ocean temperature and d18Osw records spanning the last deglaciation from an eastern subpolar North Atlantic site that lies along the flow path of the North Atlantic Current, approaching deep convection sites in the Labrador and Greenland-Iceland-Norwegian (GIN) Seas. High-resolution temperature and d18Osw records from subpolar Site 980 help track the movement of the subpolar/subtropical front associated with temperature and Atlantic MOC changes throughout the last deglaciation. Distinct d18Osw minima during Heinrich 1 (H1) and the Younger Dryas (YD) correspond with peaks in ice-rafted debris and periods of reduced Atlantic MOC, indicating the presence of melt water in this region that could have contributed to MOC reductions during these intervals. Increased tropical and subtropical d18Osw during these periods of apparent freshening in the subpolar North Atlantic suggest a buildup of salt at low latitudes that served as a negative feedback on reduced Atlantic MOC.
Further details:
Oppo, Delia W; McManus, Jerry F; Cullen, James L (2003): (Table S1) Age determination of ODP Hole 162-980B. PANGAEA,
Oppo, Delia W; McManus, Jerry F; Cullen, James L (2003): Palaeo-oceanography: Deepwater variability in the Holocene epoch. Nature, 422(6929), 277-277,
Latitude: 55.484933 * Longitude: -14.702267
Date/Time Start: 1995-07-10T00:00:00 * Date/Time End: 1995-07-11T00:00:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 4.920 m
162-980 * Latitude: 55.484933 * Longitude: -14.702267 * Date/Time Start: 1995-07-10T00:00:00 * Date/Time End: 1995-07-11T00:00:00 * Elevation: -2180.0 m * Penetration: 353.7 m * Recovery: 366.7 m * Location: North Atlantic Ocean * Campaign: Leg162 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 39 cores; 353.7 m cored; 0 m drilled; 103.7% recovery
Sediment depth is given in mcd.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Age, dated materialDated materialBenway, Heather M
3Age, datedAge datedkaBenway, Heather MAge, 14C AMS
4Age, dated standard deviationAge std dev±Benway, Heather MAge, 14C AMS
5Calendar yearsCal yrska BPBenway, Heather MAge, 14C calibrated, CALIB 6.0 (Reimer et al., 2009)represent the maximum probability of the 2-sigma range
6Age, commentCommBenway, Heather M
155 data points

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