noaa-ocean-6411 Northeast Atlantic MD95-2006 MIS3 Faunal SST, IRD, and Isotope Data Dickson, A.J.; Austin, W.E.N.; Hall, I.R.; Maslin, M.A.; Kucera, M. Northeast Atlantic MD95-2006 MIS3 Faunal SST, IRD, and Isotope Data 2008-07-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/6411 Investigator A.J. Dickson Investigator W.E.N. Austin Investigator I.R. Hall Investigator M.A. Maslin Investigator M. Kucera earth science paleoclimate paleoceanography Neogloboquadrina pachyderma sinistral,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Neogloboquadrina pachyderma sinistral,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Globigerina bulloides,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,benthic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,null,null,degree Celsius,summer,climate reconstructions|paleoceanography,null,artificial neural network,N,null earth science paleoclimate paleoceanography delta 13C,benthic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,null,one standard deviation,degree Celsius,summer,climate reconstructions|paleoceanography,null,null,N,simmax method earth science paleoclimate paleoceanography age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,null,one standard deviation,degree Celsius,summer,climate reconstructions|paleoceanography,null,artificial neural network,N,null earth science paleoclimate paleoceanography ice rafted debris,null,null,count per gram,null,paleoceanography,null,null,N,>150 microns earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,null,null,degree Celsius,summer,climate reconstructions|paleoceanography,null,null,N,simmax method earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean lithology earth science paleoclimate paleocean carbon isotopes earth science paleoclimate paleocean reconstruction earth science paleoclimate paleocean population abundance earth science paleoclimate paleocean age control geoscientificInformation Sea Surface Temperature Reconstruction 56366 14C yr BP 39960 14C yr BP 56366 cal yr BP 43731 cal yr BP Complete 57.03 57.03 -10.05 -10.05 -2130 -2130 Ocean Atlantic Ocean North Atlantic Ocean MD95-2006>LATITUDE 57.03>LONGITUDE -10.05 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

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Boulder CO 80305-3328 USA online ASCII Dickson, A.J., W.E.N. Austin, I.R. Hall, M.A. Maslin, and M. Kucera. 2008. Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka B.P. Paleoceanography, 23, PA3206.

There is much uncertainty surrounding the mechanisms that forced the abrupt climate fluctuations found in many palaeoclimate records during Marine Isotope Stage (MIS)-3. One of the processes thought to be involved in these events is the Atlantic Meridional Overturning Circulation (MOC), which exhibited large changes in its dominant mode throughout the last glacial period. Giant piston core MD95-2006 from the northeast Atlantic Ocean records a suite of palaeoceanographic proxies related to the activity of both surface and deep water masses through a period of MIS-3 when abrupt climate fluctuations were extremely pronounced. A two-stage progression of surface water warming during interstadial warm events is proposed, with initial warming related to the northward advection of a thin warm surface layer within the North Atlantic Current, which only extended into deeper surface layers as the interstadial progressed. Benthic foraminifera isotope data also show millennial-scale oscillations but of a different structure to the abrupt surface water changes. These changes are argued to partly be related to the influence of low-salinity deepwater brines. The influence of deepwater brines over the site of MD95-2006 reached a maximum at times of rapid warming of surface waters. This observation supports the suggestion that brine formation may have helped to destabilize the accumulation of warm, saline surface waters at low latitudes, helping to force the MOC into a warm mode of operation. The contribution of deepwater brines relative to other mechanisms proposed to alter the state of the MOC needs to be examined further in future studies.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/m95-2006-tab.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dickson2008 USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11