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Datasets of project "Impact of Gateways on Ocean Circulation, Climate, and Evolution"

Mostrando recursos 1 - 20 de 186

  1. Stable carbon and oxygen isotope record of Neogloboquadrina pachyderma and Cibicides lobatulus from the southwestern Greenland Sea

    Millo, Christian; Sarnthein, Michael; Erlenkeuser, Helmut; Frederichs, Thomas
    A core transect across the southwestern Greenland Sea reveals coeval events of extremely negative planktic and benthic delta13C excursions between 40 and 87 ka. The most pronounced event, event 1, began at peak Dansgaard-Oeschger stadial 22 (85 ka) with a duration of 18 k.y. During this episode, incursions of Atlantic Intermediate Water caused a bottom-water warming of up to 8 °C. The amplitude, timing, and geographic pattern of the delta13C events suggest that this bottom-water warming triggered clathrate instability along the East Greenland slope and a methane-induced depletion of delta13CDIC (DIC- dissolved inorganic carbon). Since delta13C event 1 matches a...

  2. Stable carbon and oxygen isotope record of Neogloboquadrina pachyderma and Cibicides lobatulus from the southwestern Greenland Sea

    Millo, Christian; Sarnthein, Michael; Erlenkeuser, Helmut; Frederichs, Thomas
    A core transect across the southwestern Greenland Sea reveals coeval events of extremely negative planktic and benthic delta13C excursions between 40 and 87 ka. The most pronounced event, event 1, began at peak Dansgaard-Oeschger stadial 22 (85 ka) with a duration of 18 k.y. During this episode, incursions of Atlantic Intermediate Water caused a bottom-water warming of up to 8 °C. The amplitude, timing, and geographic pattern of the delta13C events suggest that this bottom-water warming triggered clathrate instability along the East Greenland slope and a methane-induced depletion of delta13CDIC (DIC- dissolved inorganic carbon). Since delta13C event 1 matches a...

  3. Stable carbon and oxygen isotope record of Neogloboquadrina pachyderma and Cibicides lobatulus from the southwestern Greenland Sea

    Millo, Christian; Sarnthein, Michael; Erlenkeuser, Helmut; Frederichs, Thomas
    A core transect across the southwestern Greenland Sea reveals coeval events of extremely negative planktic and benthic delta13C excursions between 40 and 87 ka. The most pronounced event, event 1, began at peak Dansgaard-Oeschger stadial 22 (85 ka) with a duration of 18 k.y. During this episode, incursions of Atlantic Intermediate Water caused a bottom-water warming of up to 8 °C. The amplitude, timing, and geographic pattern of the delta13C events suggest that this bottom-water warming triggered clathrate instability along the East Greenland slope and a methane-induced depletion of delta13CDIC (DIC- dissolved inorganic carbon). Since delta13C event 1 matches a...

  4. Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic

    Millo, Christian; Sarnthein, Michael; Voelker, Antje H L; Erlenkeuser, Helmut
    The Denmark Strait Overflow (DSO) today compensates for the northward flowing Norwegian and Irminger branches of the North Atlantic Current that drive the Nordic heat pump. During the Last Glacial Maximum (LGM), ice sheets constricted the Denmark Strait aperture in addition to ice eustatic/isostatic effects which reduced its depth (today ~630 m) by ~130 m. These factors, combined with a reduced north-south density gradient of the water-masses, are expected to have restricted or even reversed the LGM DSO intensity. To better constrain these boundary conditions, we present a first reconstruction of the glacial DSO, using four new and four published...

  5. Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic

    Millo, Christian; Sarnthein, Michael; Voelker, Antje H L; Erlenkeuser, Helmut
    The Denmark Strait Overflow (DSO) today compensates for the northward flowing Norwegian and Irminger branches of the North Atlantic Current that drive the Nordic heat pump. During the Last Glacial Maximum (LGM), ice sheets constricted the Denmark Strait aperture in addition to ice eustatic/isostatic effects which reduced its depth (today ~630 m) by ~130 m. These factors, combined with a reduced north-south density gradient of the water-masses, are expected to have restricted or even reversed the LGM DSO intensity. To better constrain these boundary conditions, we present a first reconstruction of the glacial DSO, using four new and four published...

  6. Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic

    Millo, Christian; Sarnthein, Michael; Voelker, Antje H L; Erlenkeuser, Helmut
    The Denmark Strait Overflow (DSO) today compensates for the northward flowing Norwegian and Irminger branches of the North Atlantic Current that drive the Nordic heat pump. During the Last Glacial Maximum (LGM), ice sheets constricted the Denmark Strait aperture in addition to ice eustatic/isostatic effects which reduced its depth (today ~630 m) by ~130 m. These factors, combined with a reduced north-south density gradient of the water-masses, are expected to have restricted or even reversed the LGM DSO intensity. To better constrain these boundary conditions, we present a first reconstruction of the glacial DSO, using four new and four published...

  7. Properties of foraminifera from Denmark Strait

    Lorenz, Andrea
    The Denmark Strait is a key area for the exchange of water masses and functions as a deep-water gateway between the Nordic Seas and the North Atlantic. Thus it constitutes an important part of the global thermohaline circulation (THC). The gateway aperture is influenced by eustatically and isostatically controlled changes of the Denmark Strait sill and by alteration in density contrasts between the water masses in North and South. In order to determine the faunal exchange through the changing aperture, benthic foraminiferal assemblages were analysed. Eight surface sediment samples were taken along the East Greenland continental margin during the RV...

  8. Properties of foraminifera from Denmark Strait

    Lorenz, Andrea
    The Denmark Strait is a key area for the exchange of water masses and functions as a deep-water gateway between the Nordic Seas and the North Atlantic. Thus it constitutes an important part of the global thermohaline circulation (THC). The gateway aperture is influenced by eustatically and isostatically controlled changes of the Denmark Strait sill and by alteration in density contrasts between the water masses in North and South. In order to determine the faunal exchange through the changing aperture, benthic foraminiferal assemblages were analysed. Eight surface sediment samples were taken along the East Greenland continental margin during the RV...

  9. Stable isotope analysis and temperature reconstruction data from DSDP Hole 94-609B and ODP Hole 162-984B

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara; Erlenkeuser, Helmut; Garbe-Schönberg, Carl-Dieter; Lea, David W
    The Greenland ice sheet is accepted as a key factor controlling the Quaternary glacial scenario. However, the origin and mechanisms of major Arctic glaciation starting at 3.15 Ma and culminating at 2.74 Ma are still controversial. For this phase of intense cooling Ravelo et al. proposed a complex gradual forcing mechanism. In contrast, our new submillennial-scale paleoceanographic records from the Pliocene North Atlantic suggest a far more precise timing and forcing for the initiation of northern hemisphere glaciation (NHG), since it was linked to a 2-3 °C surface water warming during warm stages from 2.95 to 2.82 Ma. These records...

  10. Stable isotope analysis and temperature reconstruction data from DSDP Hole 94-609B and ODP Hole 162-984B

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara; Erlenkeuser, Helmut; Garbe-Schönberg, Carl-Dieter; Lea, David W
    The Greenland ice sheet is accepted as a key factor controlling the Quaternary glacial scenario. However, the origin and mechanisms of major Arctic glaciation starting at 3.15 Ma and culminating at 2.74 Ma are still controversial. For this phase of intense cooling Ravelo et al. proposed a complex gradual forcing mechanism. In contrast, our new submillennial-scale paleoceanographic records from the Pliocene North Atlantic suggest a far more precise timing and forcing for the initiation of northern hemisphere glaciation (NHG), since it was linked to a 2-3 °C surface water warming during warm stages from 2.95 to 2.82 Ma. These records...

  11. Stable isotope analysis and temperature reconstruction data from DSDP Hole 94-609B and ODP Hole 162-984B

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara; Erlenkeuser, Helmut; Garbe-Schönberg, Carl-Dieter; Lea, David W
    The Greenland ice sheet is accepted as a key factor controlling the Quaternary glacial scenario. However, the origin and mechanisms of major Arctic glaciation starting at 3.15 Ma and culminating at 2.74 Ma are still controversial. For this phase of intense cooling Ravelo et al. proposed a complex gradual forcing mechanism. In contrast, our new submillennial-scale paleoceanographic records from the Pliocene North Atlantic suggest a far more precise timing and forcing for the initiation of northern hemisphere glaciation (NHG), since it was linked to a 2-3 °C surface water warming during warm stages from 2.95 to 2.82 Ma. These records...

  12. Stable isotope analysis of benthic foraminifera and sedimentology on ODP Site 162-984

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara
    Sediments recovered at ODP Site 984 on the Reykjanes Ridge provided multicentennial-scale records (SST, planktic and benthic delta18O, IRD and magnetic susceptibility) of Late Pliocene climate change over the onset of Northern Hemisphere glaciation (NHG), 2.95-2.82 Ma. Short-term climate variations prior and after the onset of continent-wide glaciation were compared to test the hypothesis, whether Dansgaard-Oeschger (DO) cycles may have been triggered by continental ice breakouts. By means of spectral analyses for two selected interglacial stages prior to and after NHG (G15 and G1), we found that climate variability resembled that of the Holocene and the mid-Pliocene warm period. In...

  13. Stable isotope analysis of benthic foraminifera and sedimentology on ODP Site 162-984

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara
    Sediments recovered at ODP Site 984 on the Reykjanes Ridge provided multicentennial-scale records (SST, planktic and benthic delta18O, IRD and magnetic susceptibility) of Late Pliocene climate change over the onset of Northern Hemisphere glaciation (NHG), 2.95-2.82 Ma. Short-term climate variations prior and after the onset of continent-wide glaciation were compared to test the hypothesis, whether Dansgaard-Oeschger (DO) cycles may have been triggered by continental ice breakouts. By means of spectral analyses for two selected interglacial stages prior to and after NHG (G15 and G1), we found that climate variability resembled that of the Holocene and the mid-Pliocene warm period. In...

  14. Stable isotope analysis of benthic foraminifera and sedimentology on ODP Site 162-984

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara
    Sediments recovered at ODP Site 984 on the Reykjanes Ridge provided multicentennial-scale records (SST, planktic and benthic delta18O, IRD and magnetic susceptibility) of Late Pliocene climate change over the onset of Northern Hemisphere glaciation (NHG), 2.95-2.82 Ma. Short-term climate variations prior and after the onset of continent-wide glaciation were compared to test the hypothesis, whether Dansgaard-Oeschger (DO) cycles may have been triggered by continental ice breakouts. By means of spectral analyses for two selected interglacial stages prior to and after NHG (G15 and G1), we found that climate variability resembled that of the Holocene and the mid-Pliocene warm period. In...

  15. Magnetic susceptibility versus age from ODP Hole 162-984B

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara

  16. Magnetic susceptibility versus age from ODP Hole 162-984B

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara

  17. Magnetic susceptibility versus age from ODP Hole 162-984B

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara

  18. Stable carbon isotopes measured on Globigerina bulloides from ODP Hole 162-984B

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara

  19. Stable carbon isotopes measured on Globigerina bulloides from ODP Hole 162-984B

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara

  20. Stable carbon isotopes measured on Globigerina bulloides from ODP Hole 162-984B

    Bartoli, Gretta; Sarnthein, Michael; Weinelt, Mara

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