noaa-ocean-14413 Eastern Subpolar North Atlantic Stable Isotope, Mg/Ca and SST Data During the Last Deglaciation Benway, H.M.; McManus, J.F.; Oppo, D.W.; Cullen, J.L. Eastern Subpolar North Atlantic Stable Isotope, Mg/Ca and SST Data During the Last Deglaciation 2013-05-15 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/14413 Investigator H.M. Benway Investigator J.F. McManus Investigator D.W. Oppo Investigator J.L. Cullen earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,composited,null,N,null earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globigerina falconensis earth science paleoclimate paleoceanography Neogloboquadrina pachyderma sinistral,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Globorotalia inflata,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Globorotalia truncatulinoides,null,null,percent,null,paleoceanography,null,null,N,right coiling earth science paleoclimate paleoceanography Globorotalia crassaformis,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globigerinella calida earth science paleoclimate paleoceanography Globigerina bulloides,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Globorotalia truncatulinoides,null,null,percent,null,paleoceanography,null,null,N,left coiling earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globorotalia scitula earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Neogloboquadrina pachyderma dextral,null,per mil VPDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Neogloboquadrina pachyderma sinistral,null,null,percent,null,paleoceanography,null,null,N,left coiling earth science paleoclimate paleoceanography Globorotalia menardii,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Orbulina universa,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Globigerinella siphonifera,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globoturborotalita rubescens earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globigerina quinqueloba earth science paleoclimate paleoceanography magnesium/calcium,Neogloboquadrina pachyderma sinistral,null,millimole per mole,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Trilobatus sacculifer,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Truncatulina humilis earth science paleoclimate paleoceanography Pulleniatina obliquiloculata,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography ice rafted debris,null,null,count per gram,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Globorotalia hirsuta,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globigerinita glutinata earth science paleoclimate paleoceanography delta 18O,benthic foraminifer,null,per mil VPDB,null,paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,delta 18O,null,degree Celsius,summer,climate reconstructions|paleoceanography,null,modern analogue technique,N,null earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globigerinoides conglobata earth science paleoclimate paleoceanography Globigerinoides ruber,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globoturborotalita tenella earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globigerina digitata earth science paleoclimate paleoceanography Neogloboquadrina dutertrei,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globorotalia theyeri earth science paleoclimate paleoceanography total foraminifers,null,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Neogloboquadrina pachyderma sinistral,null,per mil VPDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Neogloboquadrina pachyderma dextral,null,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,From Neogloboquadrina pachyderma dextral 14C dates earth science paleoclimate paleoceanography magnesium/calcium,Neogloboquadrina pachyderma dextral,null,millimole per mole,null,paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,cadmium/calcium,null,degree Celsius,winter,climate reconstructions|paleoceanography,null,modern analogue technique,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,Globigerinita iota earth science paleoclimate paleoceanography identified foraminifer,null,null,percent,null,paleoceanography,null,null,N,unidentified foraminifera earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes earth science paleoclimate paleocean reconstruction earth science paleoclimate paleocean population abundance geoscientificInformation 22000 cal yr BP 10000 cal yr BP Complete 55.48 55.48 -14.7 -14.7 -2168 -2168 Ocean Atlantic Ocean North Atlantic Ocean ODP 980>LATITUDE 55.48>LONGITUDE -14.7 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 Benway, H.M., J.F. McManus, D.W. Oppo, and J.L. Cullen. 2010. Hydrographic changes in the eastern subpolar North Atlantic during the last deglaciation. Quaternary Science Reviews, 29, 3336-3345. DOI:10.1016/j.quascirev.2010.08.013.

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. STUDY NOTES: The chronology for ODP Site 980 is based on 35 monospecific foraminifera accelerator mass spectrometry (AMS) 14C dates (Globigerina bulloides, N. pachyderma (d), N. pachyderma (s)) spanning from the LGM to the late Holocene (Table 1 in publication). The Calib (Stuiver and Reimer, 1993) program (version 6.0, Marine09 calibration data set of Reimer et al., 2009) was used to convert 14C ages to calendar ages. The resulting age model suggests an average sedimentation rate of ~23 cm/ky throughout the deglacial interval. Calendar age differences between N. pachyderma (s) and N. pachyderma (d) at the same depths (Table 1) are mostly on the order of 100-200 years, except for a ~900-year difference just prior to the onset of the BA, which may reflect age differences in polar vs. subpolar water masses. These age discrepancies are taken into account by applying slightly different age models for N. pachyderma (s) vs. N. pachyderma (d) records (based on dual ages obtained at the four depth intervals listed in Table 1 in publication). Paired geochemical measurements of two planktonic foraminifer species, Neogloboquadrina pachyderma (dextral (d), or right-coiling) and N. pachyderma (sinistral (s), or left-coiling), constrain changes in upper ocean temperature and salinity and their relationship to global climate and deep ocean circulation. The oxygen isotope composition of foraminiferal calcite (d18Oc) reflects both ambient calcification temperature and seawater isotopic composition (d18Osw). Independent estimates of calcification temperature from Mg/Ca measurements differentiate temperature and d18Osw influences on d18Oc.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/benway2010/benway2010-fauna.txt Formatted Text File; ODP980 Faunal Abundance Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/benway2010/benway2010.txt USA/NOAA DIF Version 9.8.4 2019-06-07 2019-06-07