noaa-ocean-9035 North Atlantic ODP984C 25KYr Grain Size and Stable Isotope Data Praetorius, S.K.; McManus, J.F.; Oppo, D.W.; Curry, W.B. North Atlantic ODP984C 25KYr Grain Size and Stable Isotope Data 2008-07-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/9035 Investigator S.K. Praetorius Investigator J.F. McManus Investigator D.W. Oppo Investigator W.B. Curry 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 oxygen isotopes earth science paleoclimate paleocean carbon isotopes earth science paleoclimate paleocean lithology earth science paleoclimate paleocean physical properties earth science paleoclimate paleocean age control geoscientificInformation 25314 14C yr BP 448 14C yr BP 30181 cal yr BP 462 cal yr BP Complete 61.43 61.43 -24.08 -24.08 -1648 -1648 Ocean Atlantic Ocean North Atlantic Ocean ODP 984C>LATITUDE 61.43>LONGITUDE -24.08 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII 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.

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp984c-sytr-tab.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2008 GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp984c-tab.txt USA/NOAA DIF Version 9.8.4 2019-06-07 2019-06-07