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Datasets with geocode "DISTANCE"

Mostrando recursos 1 - 20 de 570

  1. A deep-sea coral record of the North Atlantic

    Eltgroth, Selene F; Adkins, Jess; Robinson, Laura F; Southon, John; Kashgarian, Michaele
    Our record of Younger Dryas intermediate-depth seawater D14C from North Atlantic deep-sea corals supports a link between abrupt climate change and intermediate ocean variability. Our data show that northern source intermediate water (~1700 m) was partially replaced by 14C-depleted southern source water at the onset of the event, consistent with a reduction in the rate of North Atlantic Deep Water formation. This transition requires the existence of large, mobile gradients of D14C in the ocean during the Younger Dryas. The D14C water column profile from Keigwin (2004) provides direct evidence for the presence of one such gradient at the beginning...

  2. A deep-sea coral record of the North Atlantic

    Eltgroth, Selene F; Adkins, Jess; Robinson, Laura F; Southon, John; Kashgarian, Michaele
    Our record of Younger Dryas intermediate-depth seawater D14C from North Atlantic deep-sea corals supports a link between abrupt climate change and intermediate ocean variability. Our data show that northern source intermediate water (~1700 m) was partially replaced by 14C-depleted southern source water at the onset of the event, consistent with a reduction in the rate of North Atlantic Deep Water formation. This transition requires the existence of large, mobile gradients of D14C in the ocean during the Younger Dryas. The D14C water column profile from Keigwin (2004) provides direct evidence for the presence of one such gradient at the beginning...

  3. (Table 3) Radiocarbon age determination of Desmophyllum dianthus samples

    Eltgroth, Selene F; Adkins, Jess; Robinson, Laura F; Southon, John; Kashgarian, Michaele

  4. (Table 3) Radiocarbon age determination of Desmophyllum dianthus samples

    Eltgroth, Selene F; Adkins, Jess; Robinson, Laura F; Southon, John; Kashgarian, Michaele

  5. Geochemistry and stable isotope record of black shales and inoceramids from the Demerara Rise

    Jiménez Berrocosco, Álvaro; MacLeod, Kenneth G; Calvert, Stephen E; Elorza, Javier
    The bulk rock geochemistry and inoceramid isotopic composition from Cenomanian to Santonian, finely laminated, organic-rich black shales, recovered during Ocean Drilling Program Leg 207 on Demerara Rise (western tropical North Atlantic), suggest persistent anoxic (free H2S) conditions within the sediments and short-term variations within a narrow range of anoxic to episodically dysoxic bottom waters over a ~15 Ma time interval. In addition to being organic-rich, the 50-90 m thick sections examined exhibit substantial bulk rock enrichments of Si, P, Ba, Cu, Mo, Ni, and Zn relative to World Average Shale. These observations point to high organic burial fluxes, likely driven...

  6. Geochemistry and stable isotope record of black shales and inoceramids from the Demerara Rise

    Jiménez Berrocosco, Álvaro; MacLeod, Kenneth G; Calvert, Stephen E; Elorza, Javier
    The bulk rock geochemistry and inoceramid isotopic composition from Cenomanian to Santonian, finely laminated, organic-rich black shales, recovered during Ocean Drilling Program Leg 207 on Demerara Rise (western tropical North Atlantic), suggest persistent anoxic (free H2S) conditions within the sediments and short-term variations within a narrow range of anoxic to episodically dysoxic bottom waters over a ~15 Ma time interval. In addition to being organic-rich, the 50-90 m thick sections examined exhibit substantial bulk rock enrichments of Si, P, Ba, Cu, Mo, Ni, and Zn relative to World Average Shale. These observations point to high organic burial fluxes, likely driven...

  7. (Table S8) Carbonate isotopic ratios across the growth lines of the inoceramid D3, ODP Hole 207-1261A

    Jiménez Berrocosco, Álvaro; MacLeod, Kenneth G; Calvert, Stephen E; Elorza, Javier

  8. (Table S8) Carbonate isotopic ratios across the growth lines of the inoceramid D3, ODP Hole 207-1261A

    Jiménez Berrocosco, Álvaro; MacLeod, Kenneth G; Calvert, Stephen E; Elorza, Javier

  9. (Table S7) Carbonate isotopic ratios across the growth lines of the inoceramid D5, ODP Hole 207-1261A

    Jiménez Berrocosco, Álvaro; MacLeod, Kenneth G; Calvert, Stephen E; Elorza, Javier

  10. (Table S7) Carbonate isotopic ratios across the growth lines of the inoceramid D5, ODP Hole 207-1261A

    Jiménez Berrocosco, Álvaro; MacLeod, Kenneth G; Calvert, Stephen E; Elorza, Javier

  11. (Table S6) Carbonate isotopic ratios across the growth lines of the inoceramid T5, ODP Hole 207-1261A

    Jiménez Berrocosco, Álvaro; MacLeod, Kenneth G; Calvert, Stephen E; Elorza, Javier

  12. (Table S6) Carbonate isotopic ratios across the growth lines of the inoceramid T5, ODP Hole 207-1261A

    Jiménez Berrocosco, Álvaro; MacLeod, Kenneth G; Calvert, Stephen E; Elorza, Javier

  13. Skeletal density of Porites

    Gagan, Michael K; Dunbar, Gavin B; Suzuki, Atsushi
    Paleotemperature estimates based on coral Sr/Ca have not been widely accepted because the reconstructed glacial-Holocene shift in tropical sea-surface temperature (~4-6°C) is larger than that indicated by foraminiferal Mg/Ca (~2-4°C). We show that corals over-estimate changes in sea-surface temperature (SST) because their records are attenuated during skeletogenesis within the living tissue layer. To quantify this process, we microprofiled skeletal mass accumulation within the tissue layer of Porites from Australasian coral reefs and laboratory culturing experiments. The results show that the sensitivity of the Sr/Ca and d18O thermometers in Porites will be suppressed, variable, and dependent on the relationship between skeletal...

  14. Skeletal density of Porites

    Gagan, Michael K; Dunbar, Gavin B; Suzuki, Atsushi
    Paleotemperature estimates based on coral Sr/Ca have not been widely accepted because the reconstructed glacial-Holocene shift in tropical sea-surface temperature (~4-6°C) is larger than that indicated by foraminiferal Mg/Ca (~2-4°C). We show that corals over-estimate changes in sea-surface temperature (SST) because their records are attenuated during skeletogenesis within the living tissue layer. To quantify this process, we microprofiled skeletal mass accumulation within the tissue layer of Porites from Australasian coral reefs and laboratory culturing experiments. The results show that the sensitivity of the Sr/Ca and d18O thermometers in Porites will be suppressed, variable, and dependent on the relationship between skeletal...

  15. (Table 2) Skeletal bulk density microprofile data for free-growing and laboratory cultured Porites

    Gagan, Michael K; Dunbar, Gavin B; Suzuki, Atsushi

  16. (Table 2) Skeletal bulk density microprofile data for free-growing and laboratory cultured Porites

    Gagan, Michael K; Dunbar, Gavin B; Suzuki, Atsushi

  17. Age determination and geochemistry of corals from the North Pacific

    Hill, Tessa M; LaVigne, M; Spero, Howard J; Guilderson, Thomas P; Gaylord, B; Clague, David A
    A depth transect of deep-sea bamboo corals along the California margin provides evidence that coral strontium to calcium ratios (Sr/Ca[coral]) record seawater Sr/Ca ratios (Sr/Ca[sw]). A calibration was constructed utilizing Sr/Ca[coral] ratios and previously published Pacific Sr/Ca[sw] data (R**2 = 0.53, n = 12, p < 0.01): Sr/Ca[coral] (mmol/mol) = 4.62*Sr/Ca[sw] (mmol/mol) - 36.64. Sr/Ca[sw] is ultimately governed by the remineralization of Sr-containing shells of surface water-derived marine organisms (e.g., Acantharia) at intermediate water depths. California margin Sr/Cacoral records from 792 and 1295 m document fluctuations in Sr/Ca[sw] that appear decadal-scale. These results suggest that Sr/Casw may not be as...

  18. Age determination and geochemistry of corals from the North Pacific

    Hill, Tessa M; LaVigne, M; Spero, Howard J; Guilderson, Thomas P; Gaylord, B; Clague, David A
    A depth transect of deep-sea bamboo corals along the California margin provides evidence that coral strontium to calcium ratios (Sr/Ca[coral]) record seawater Sr/Ca ratios (Sr/Ca[sw]). A calibration was constructed utilizing Sr/Ca[coral] ratios and previously published Pacific Sr/Ca[sw] data (R**2 = 0.53, n = 12, p < 0.01): Sr/Ca[coral] (mmol/mol) = 4.62*Sr/Ca[sw] (mmol/mol) - 36.64. Sr/Ca[sw] is ultimately governed by the remineralization of Sr-containing shells of surface water-derived marine organisms (e.g., Acantharia) at intermediate water depths. California margin Sr/Cacoral records from 792 and 1295 m document fluctuations in Sr/Ca[sw] that appear decadal-scale. These results suggest that Sr/Casw may not be as...

  19. (Table 3) Age determination and calculated growth rates of corals

    Hill, Tessa M; LaVigne, M; Spero, Howard J; Guilderson, Thomas P; Gaylord, B; Clague, David A

  20. (Table 3) Age determination and calculated growth rates of corals

    Hill, Tessa M; LaVigne, M; Spero, Howard J; Guilderson, Thomas P; Gaylord, B; Clague, David A

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