North Atlantic ODP984C 25KYr Grain Size and Stable Isotope Data Praetorius, S.K.; McManus, J.F.; Oppo, D.W.; Curry, W.B. Praetorius, S.K. McManus, J.F. Oppo, D.W. Curry, W.B. earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (sortable silt mean grain size,null,null,micrometer,null,paleoceanography,null,null,N,varying size fraction) earth science/paleoclimate/paleoceanography (sortable silt mean grain size,null,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (sortable silt mean grain size,null,null,micrometer,null,paleoceanography,averaged|smoothed,null,N,3-pt running mean of an average of the three methods) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (sortable silt mean grain size,null,null,micrometer,null,paleoceanography,null,null,N,10-45 micron size fraction) earth science/paleoclimate/paleoceanography (sortable silt mean grain size,null,null,micrometer,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (sortable silt mean grain size,null,one standard error,micrometer,null,paleoceanography,averaged|smoothed,null,N,3-pt running mean of an average of the three methods) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 984C>LATITUDE 61.43>LONGITUDE -24.08) Past changes in the freshwater balance of the surface North Atlantic Ocean are thought to have influenced the rate of deep-water formation, and consequently climate. Although water-mass proxies are generally consistent with an impact of freshwater input on meridional overturning circulation, there has been little dynamic evidence to support this linkage. Here we present a 25,000 year record of variations in sediment grain size from south of Iceland, which indicates vigorous bottom-water currents during both the last glacial maximum and the Holocene period. Together with reconstructions of North Atlantic water-mass distribution, vigorous bottom currents suggest a shorter residence time of northern-source waters during the last glacial maximum, relative to the Holocene period. The most significant reductions in flow strength occur during periods that have been associated with freshening of the surface North Atlantic. The short-term deglacial oscillations in bottom current strength are closely coupled to changes in Greenland air temperature, with a minimum during the Younger Dryas cold reversal and a maximum at the time of rapid warming at the onset of the Holocene. Our results support a strong connection between ocean circulation and rapid climate change. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Praetorius, S.K. Investigator : McManus, J.F. Investigator : Oppo, D.W. Investigator : Curry, W.B. 2008-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9035 https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp984c-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2008 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp984c-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp984c-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2008 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp984c-tab.txt English https://www.ncdc.noaa.gov/paleo/study/9035 https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp984c-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2008 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp984c-tab.txt Praetorius, S.K., J.F. McManus, D.W. Oppo, and W.B. Curry. 2008. Episodic reductions in bottom-water currents since the last ice age. Nature Geoscience, 1, 449-452. START YEAR: 25314 14C yr BP * END YEAR: 448 14C yr BP -24.08 61.43 -24.08 61.43