noaa-ocean-18496 Atlantic Ocean 23,000 Year Benthic Foraminifera Stable Isotope Data Oppo, D.W.; Curry, W.B.; McManus, J.F. Atlantic Ocean 23,000 Year Benthic Foraminifera Stable Isotope Data 2015-04-13 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/18496 Investigator D.W. Oppo Investigator W.B. Curry Investigator J.F. McManus earth science paleoclimate paleoceanography delta 13C,Cibicidoides sp.,null,per mil PDB,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 age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,species earth science paleoclimate paleoceanography delta 18O,Cibicidoides sp.,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes geoscientificInformation Meridional Overturning Circulation (MOC) 26191 cal yr BP 371 cal yr BP Complete -27.89 62.321667 -46.04 -21.457333 -2397 -1450 Ocean Atlantic Ocean North Atlantic Ocean EW9302-25GGC>LATITUDE 62.063>LONGITUDE -21.472167 Ocean Atlantic Ocean North Atlantic Ocean EW9302-24GGC>LATITUDE 61.762833>LONGITUDE -21.667667 Ocean Atlantic Ocean North Atlantic Ocean EW9302-26GGC>LATITUDE 62.321667>LONGITUDE -21.457333 Ocean Atlantic Ocean South Atlantic Ocean KNR159-5-73GGC>LATITUDE -27.89>LONGITUDE -46.04 Ocean Atlantic Ocean North Atlantic Ocean ODP 984>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

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Boulder CO 80305-3328 USA online ASCII Oppo, D.W., W.B. Curry, and J.F. McManus 2015 Paleoceanography 30 10.1002/2014PA002667 http://onlinelibrary.wiley.com/doi/10.1002/2014PA002667/full

Approximately synchronous with the onset of Heinrich Stadial 1 (HS1), d13C decreased throughout most of the upper (~1000-2500 m) Atlantic, and at some deeper North Atlantic sites. This early deglacial d13C decrease has been alternatively attributed to a reduced fraction of high-d13C North Atlantic Deep Water (NADW) or to a decrease in the NADW d13C source value. Here we present new benthic d18O and d13C records from three relatively shallow (~1450-1650 m) subpolar Northeast Atlantic cores. With published data from other cores, these data form a depth transect (~1200-3900 m) in the subpolar Northeast Atlantic. We compare Last Glacial Maximum (LGM) and HS1 data from this transect with data from a depth transect of cores from the Brazil Margin. The largest LGM-to-HS1 decreases in both benthic d13C and d18O occurred in upper waters containing the highest NADW fraction during the LGM. We show that the d13C decrease can be explained entirely by a lower NADW d13C source value, entirely by a decrease in the proportion of NADW relative to Southern Ocean Water, or by a combination of these mechanisms. However, building on insights from model simulations, we hypothesize that reduced ventilation due to a weakened but still active Atlantic Meridional Overturning Circulation also contributed to the low d13C values in the upper North Atlantic. We suggest that the benthic d18O gradients above ~2300 m at both core transects indicate the depth to which heat and North Atlantic deglacial freshwater had mixed into the subsurface ocean by early HS1. STUDY NOTES: Benthic isotope data from Atlantic cores used by Oppo et al. 2015.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oppo2015/oppo2015ggc25.txt Data File; EW9302-25GGC Benthic Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oppo2015/oppo2015ggc73.txt Data File; KNR159-5-73GGC Benthic Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oppo2015/oppo2015.xlsx Excel Data File; All Data (including previously published) GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oppo2015/oppo2015ggc26.txt Data File; EW9302-26GGC Benthic Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oppo2015/oppo2015odp984.txt Data File; ODP984 Neogloboquadrina pachyderma percentages GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oppo2015/oppo2015ggc24.txt Data File; EW9302-24GGC Benthic Stable Isotope Data USA/NOAA DIF Version 9.8.4 2019-06-07 2019-06-07