noaa-ocean-20550 Orca Basin, Gulf of Mexico Stable Isotope, Trace Metal and Geochemistry Data with SST and SSS Reconstructions over the last 17 ka Vetter, L.; Spero, H.J.; Eggins, S.M.; Williams, C.; Flower, B.P. Orca Basin, Gulf of Mexico Stable Isotope, Trace Metal and Geochemistry Data with SST and SSS Reconstructions over the last 17 ka 2016-09-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20550 Investigator L. Vetter Investigator H.J. Spero Investigator S.M. Eggins Investigator C. Williams Investigator B.P. Flower earth science paleoclimate climate reconstructions|paleoceanography delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,null,null,N,Calculated water oxygen isotope value using calculated temperature and the formula of Bemis et al. 1998 earth science paleoclimate climate reconstructions|paleoceanography delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,corrected,null,N,Estimated seawater oxygen isotope value when corrected for ice volume effects using the ice volume isotope offsets of Williams et al. 2012 earth science paleoclimate paleoceanography magnesium/calcium,Orbulina universa,two standard deviations lower bound,millimole per mole,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography barium/calcium,Orbulina universa,null,micromole per mole,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,Core name collected aboard the RV Marion Dufresne earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,C,mbsf earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Calculated temperature from measured Mg/Ca ratio using the relationship of Russell et al. 2004; Orbulina universa earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,Diameter of each specimen shell earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,Mass of each specimen after sonication in methanol Sartorius ultramicrobalance earth science paleoclimate paleoceanography delta 13C,Orbulina universa,null,per mil VPDB,null,paleoceanography,null,isotope ratio mass spectrometry,N,0.03 error; gas-source dual inlet stable carbon isotope measurement with ±0.03 per mil (‰) (2 SD) earth science paleoclimate paleoceanography magnesium/calcium,Orbulina universa,null,millimole per mole,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography barium/calcium,Orbulina universa,two standard deviations upper bound,micromole per mole,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography magnesium/calcium,Orbulina universa,two standard deviations upper bound,millimole per mole,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,specimen number; Individual specimens of the planktic foraminiferal species O. universa were picked from the >350 µm size fraction and assigned specimen numbers earth science paleoclimate climate reconstructions|paleoceanography salinity,delta 18O|magnesium/calcium|sea surface,null,parts per thousand,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Orbulina universa,null,per mil VPDB,null,paleoceanography,null,isotope ratio mass spectrometry,N,0.06 error; gas-source dual inlet stable oxygen isotope measurement with ±0.06 per mil (‰) (2 SD) earth science paleoclimate paleoceanography barium/calcium,Orbulina universa,two standard deviations lower bound,micromole per mole,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean trace metals in carbonates earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean reconstruction geoscientificInformation Other Hydroclimate Reconstruction Sea Surface Temperature Reconstruction 17420 cal yr BP 0 cal yr BP Complete 26.9463 26.9463 -91.3458 -91.3458 -2248 -2248 Ocean Atlantic Ocean North Atlantic Ocean Gulf Of Mexico MD02-2550>LATITUDE 26.9463>LONGITUDE -91.3458 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 Vetter, L., H.J. Spero, S.M. Eggins, C. Wiliams, and B.P. Flower 2016 Quaternary Science Reviews in revision

Quantifying the history of meltwater oxygen isotope variability of the Laurentide Ice Sheet (LIS) across the last deglaciation could provide a powerful tool for exploring the dynamics of ice sheet melting during glacial terminations. Reconstructions of the glacial-interglacial rate of change in the d18Owater of the global ocean assume a homogeneous d18O value for contributions from individual ice sheets, such as the LIS. However, observations of the Greenland and Antarctic Ice Sheets indicate dynamic and highly variable melting. Here we present a series of snapshot records of the oxygen isotopic composition of LIS meltwater entering the Gulf of Mexico during discrete time slices of the last deglaciation (18 – 11 ka). We employ a novel technique that combines laser ablation ICP-MS (LA-ICP-MS) and oxygen isotope analyses on individual shells of the planktic foraminifer Orbulina universa to quantify the instantaneous d18Owater value of ice sheet meltwater. For each individual O. universa shell we measure Mg/Ca (a proxy for temperature) and Ba/Ca (a proxy for salinity) with LA-ICP-MS, and then analyze the same O. universa for d18O using the remaining material from the shell. From these proxies, we compute d18Owater and salinity for each individual foraminifer. A regression of all the data points obtained from the same core interval yields a d18Ow vs. salinity relationship with a y-intercept that gives the d18Ow composition of the freshwater end-member. Our data suggest that prior to Bølling-Allerød warming (before ~15.5 ka), the isotopic signature of Mississippi River outflow was dominated by regional precipitation, and that LIS meltwater did not play a significant role in salinity variation in surface waters overlying the Orca Basin. During the Bølling-Allerød (15.5 to 13 ka), computed d18Ow values of LIS meltwater from discrete core intervals range from -12‰ to -49‰ (VSMOW). These values indicate a dynamic melting history of different parts of the LIS, with potential contributions from both the low-elevation, southern margin of the LIS and high-elevation, high-latitude domes in the LIS interior. After 13 ka, our data do not suggest the presence of Mississippi River outflow over the Orca Basin; we hypothesize instead that open ocean conditions prevailed as sea level rose and the paleoshoreline at the southern edge of North America retreated northward. STUDY NOTES: Data from cores MD02-2550 and MD02-2551.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/vetter2016/vetter2016.txt Formatted Text File; MD02-2550 and MD02-2551 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11