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Datasets of project "Biogeochemical Ocean Flux Study"

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  1. Sea surface temperature calculation based on alkenones in sediments off northwest Africa

    Zhao, Meixun; Beveridge, N; Shackleton, Nicholas J; Sarnthein, Michael; Eglinton, Geoffrey
    The molecular stratigraphy of Biogeochemical Oceanic Flux Study core 31K (19°N, 20°10'W) and Ocean Drilling Program Hole 658C (20°45'N, 18°35'W) has been studied for C37 alkenone abundances over the past 80 ka at high resolution (~circa 200-500 years). The derived Uk 37' sea surface temperature record for both cores shows a range of temperatures from about 18°C during the last glacial to 21.5°C during the early Holocene. Both records also reveal changes in sea surface temperature as much as 2°-4°C over a few hundred years, which correlate well with similar abrupt climatic changes observed in cores from elsewhere in the...

  2. Sea surface temperature calculation based on alkenones in sediments off northwest Africa

    Zhao, Meixun; Beveridge, N; Shackleton, Nicholas J; Sarnthein, Michael; Eglinton, Geoffrey
    The molecular stratigraphy of Biogeochemical Oceanic Flux Study core 31K (19°N, 20°10'W) and Ocean Drilling Program Hole 658C (20°45'N, 18°35'W) has been studied for C37 alkenone abundances over the past 80 ka at high resolution (~circa 200-500 years). The derived Uk 37' sea surface temperature record for both cores shows a range of temperatures from about 18°C during the last glacial to 21.5°C during the early Holocene. Both records also reveal changes in sea surface temperature as much as 2°-4°C over a few hundred years, which correlate well with similar abrupt climatic changes observed in cores from elsewhere in the...

  3. Sea surface temperature calculation based on alkenones in sediments off northwest Africa

    Zhao, Meixun; Beveridge, N; Shackleton, Nicholas J; Sarnthein, Michael; Eglinton, Geoffrey
    The molecular stratigraphy of Biogeochemical Oceanic Flux Study core 31K (19°N, 20°10'W) and Ocean Drilling Program Hole 658C (20°45'N, 18°35'W) has been studied for C37 alkenone abundances over the past 80 ka at high resolution (~circa 200-500 years). The derived Uk 37' sea surface temperature record for both cores shows a range of temperatures from about 18°C during the last glacial to 21.5°C during the early Holocene. Both records also reveal changes in sea surface temperature as much as 2°-4°C over a few hundred years, which correlate well with similar abrupt climatic changes observed in cores from elsewhere in the...

  4. Age determination of sediment cores from the northern Mid-Atlantic Ridge

    Manighetti, Barbara; McCave, I Nick; Maslin, Mark A; Shackleton, Nicholas J
    We construct age models for a suite of cores from the northeast Atlantic Ocean by means of accelerator mass spectrometer dating of a key core, BOFS 5K, and correlation with the rest of the suite. The effects of bioturbation and foraminiferal species abundance gradients upon the age record are modeled using a simple equation. The degree of bioturbation is estimated by comparing modeled profiles with dispersal of the Vedde Ash layer in core 5K, and we find a mixing depth of roughly 8 cm for sand-sized material. Using this value, we estimate that age offsets between unbioturbated sediment and some...

  5. Age determination of sediment cores from the northern Mid-Atlantic Ridge

    Manighetti, Barbara; McCave, I Nick; Maslin, Mark A; Shackleton, Nicholas J
    We construct age models for a suite of cores from the northeast Atlantic Ocean by means of accelerator mass spectrometer dating of a key core, BOFS 5K, and correlation with the rest of the suite. The effects of bioturbation and foraminiferal species abundance gradients upon the age record are modeled using a simple equation. The degree of bioturbation is estimated by comparing modeled profiles with dispersal of the Vedde Ash layer in core 5K, and we find a mixing depth of roughly 8 cm for sand-sized material. Using this value, we estimate that age offsets between unbioturbated sediment and some...

  6. Sr/Ca and Cd/Ca ratios of benthic foraminifera in surface deep-sea sediments

    Elderfield, Henry; Bertram, Caroline J; Erez, Jonathan
    Measurements of Sr/Ca of benthic foraminifera show a linear decrease with water depth which is superimposed upon significant variability identified by analyses of individual foraminifera. New data for Cd/Ca support previous work in defining a contrast between waters shallower and deeper than ~2500 m. Measured element partition coefficients in foraminiferal calcium carbonate relative to sea water (D) have been described by means of a one-box model in which elements are extracted by Rayleigh distillation from a biomineralization reservoir that serves for calcification with a constant fractionation factor (alpha), such that D = (1 - f**alpha)/(l - f), where f is...

  7. Sr/Ca and Cd/Ca ratios of benthic foraminifera in surface deep-sea sediments

    Elderfield, Henry; Bertram, Caroline J; Erez, Jonathan
    Measurements of Sr/Ca of benthic foraminifera show a linear decrease with water depth which is superimposed upon significant variability identified by analyses of individual foraminifera. New data for Cd/Ca support previous work in defining a contrast between waters shallower and deeper than ~2500 m. Measured element partition coefficients in foraminiferal calcium carbonate relative to sea water (D) have been described by means of a one-box model in which elements are extracted by Rayleigh distillation from a biomineralization reservoir that serves for calcification with a constant fractionation factor (alpha), such that D = (1 - f**alpha)/(l - f), where f is...

  8. (Appendix A) Cd/Ca ratios of benthic foraminifera from surface deep-sea sediments

    Elderfield, Henry; Bertram, Caroline J; Erez, Jonathan

  9. (Appendix A) Sr/Ca ratios of benthic foraminifera from surface deep-sea sediments

    Elderfield, Henry; Bertram, Caroline J; Erez, Jonathan

  10. Sr/Ca ratios of Cenozoic benthic foraminifera

    Lear, Caroline H; Elderfield, Henry; Wilson, Paul A
    A Cenozoic multi-species record of benthic foraminiferal calcite Sr/Ca has been produced and is corrected for interspecific offsets (typically less than 0.3 mmol/mol) and for the linear relationship between decreasing benthic foraminiferal Sr/Ca and increasing water depth. The water depth correction, determined from Holocene, Late Glacial Maximum and Eocene paleowater-depth transects, is ~0.1 mmol/mol/km. The corrected Cenozoic benthic foraminiferal Sr/Ca record ranges from 1.2 to 2.0 mmol/mol, and has been interpreted in terms of long-term changes in seawater Sr/Ca, enabling issues related to higher-resolution variability in Sr/Ca to be ignored. We estimate that seawater Sr/Ca was ~1.5 times modern values...

  11. (Table 2) Sr/Ca ratios of benthic foraminifera from Recent and LGM sediments

    Lear, Caroline H; Elderfield, Henry; Wilson, Paul A

  12. Water temperature profiles from 65 XBT drops along the track of cruise DI184

    BODC

  13. Water temperature profiles from 65 XBT drops along the track of cruise DI184

    BODC

  14. Water temperature profiles from 65 XBT drops along the track of cruise DI184

    McCave, I Nick

  15. Water temperature profiles from 65 XBT drops along the track of cruise DI183

    BODC

  16. Water temperature profiles from 65 XBT drops along the track of cruise DI183

    BODC

  17. Water temperature profiles from 65 XBT drops along the track of cruise DI183

    Harris, Roger P

  18. Water temperature profiles from 47 XBT drops along the track of cruise DI191

    BODC

  19. Water temperature profiles from 47 XBT drops along the track of cruise DI191

    BODC

  20. Water temperature profiles from 47 XBT drops along the track of cruise DI191

    Angel, Martin V

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