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  • 1
    Electronic Resource
    Electronic Resource
    Evidence from Fram Strait (78° N) for early deglaciation (1988)
    [s.l.] : Nature Publishing Group
    Nature 336 (1988), S. 56-59 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Boxcore PS21295-4, collected from the Fram Strait (Fig. 1) by the West German research vessel Polarstern in the summer of 1984, has a moderate sedimentation rate of 2.5 cm per 1,000 yr as defined by 22 accelerator mass spectrometry (AMS) I4C analyses (Table 1 and Fig. 2). With the recent ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/336056a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The North Pacific through the millennia (1995)
    [s.l.] : Nature Publishing Group
    Nature 377 (1995), S. 485-486 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] CLIMATE in the North Atlantic region is well known to vary on timescales of millennia, with abrupt changes in sea surface temperature, high-latitude air temperature, pulses of ice rafting and changes in ocean ventilation all well documented. For the past several years the search has been on for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/377485a0
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  • 3
    Electronic Resource
    Electronic Resource
    Deep circulation revisited (1992)
    [s.l.] : Nature Publishing Group
    Nature 358 (1992), S. 197-198 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Although we thank Zahn1 for his thoughtful News and Views article about the apparently conflicting evidence for changes in deep circulation during the deglaciation presented by Veum et al.2 and ourselves3, we note that the opening sentences of his article misrepresent one of our main ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/358197b0
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  • 4
    Electronic Resource
    Electronic Resource
    Sudden changes in North Atlantic circulation during the last deglaciation (1992)
    [s.l.] : Nature Publishing Group
    Nature 356 (1992), S. 757-762 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sudden changes in the flow of warm Atlantic surface waters into the Norwegian Sea occurred frequently during the last deglaciation, typically involving shifts in sea surface temperature of ⩾5 °C in fewer than 40 years. These led to equally large and rapid changes in atmospheric ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/356757a0
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  • 5
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    Arctic drainage of Laurentide Ice Sheet meltwater throughout the past 14,700 years (2022)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: During the last deglaciation substantial volumes of meltwater from the decaying Laurentide Ice Sheet were supplied to the Arctic, Gulf of Mexico and North Atlantic along different drainage routes, sometimes as catastrophic flood events. These events are suggested to have impacted global climate, for example initiating the Younger Dryas cold period. Here we analyze the authigenic Pb isotopic composition of sediments in front of the Arctic Mackenzie Delta, a sensitive tracer for elevated freshwater runoff of the retreating Laurentide Ice Sheet. Our data reveal continuous meltwater supply to the Arctic along the Mackenzie River since the onset of the Bølling–Allerød. The strongest Lake Agassiz outflow event is observed at the end of the Bølling–Allerød close to the onset of the Younger Dryas. In context of deglacial North American runoff records from the southern and eastern outlets, our findings provide a detailed reconstruction of the deglacial drainage chronology of the disintegrating Laurentide Ice Sheet.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
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  • 6
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    An atmospheric chronology for the glacial-deglacial Eastern Equatorial Pacific (2018)
    Nature Publishing Group
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Nature Communications 9 (2018): 3077, doi:10.1038/s41467-018-05574-x.
    Description: Paleoclimate reconstructions are only as good as their chronology. In particular, different chronological assumptions for marine sediment cores can lead to different reconstructions of ocean ventilation age and atmosphere−ocean carbon exchange history. Here we build the first high-resolution chronology that is free of the dating uncertainties common in marine sediment records, based on radiocarbon dating twigs found with computed tomography scans in two cores from the Eastern Equatorial Pacific (EEP). With this accurate chronology, we show that the ventilation ages of the EEP thermocline and intermediate waters were similar to today during the Last Glacial Maximum and deglaciation, in contradiction with previous studies. Our results suggest that the glacial respired carbon pool in the EEP was not significantly older than today, and that the deglacial strengthening of the equatorial Pacific carbon source was probably driven by low-latitude processes rather than an increased subsurface supply of upwelled carbon from high-latitude oceans.
    Description: The lab work at NOSAMS was supported by Ocean Ventures Fund from WHOI and an NOSAMS graduate internship granted to N.Z
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 7
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    Arctic drainage of Laurentide Ice Sheet meltwater throughout the past 14,700 years (2022)
    Nature Research
    Details
    Publication Date: 2022-08-15
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Sufke, F., Gutjahr, M., Keigwin, L. D., Reilly, B., Giosan, L., & Lippold, J. Arctic drainage of Laurentide Ice Sheet meltwater throughout the past 14,700 years. Communications Earth & Environment, 3(1), (2022): 98, https://doi.org/10.1038/s43247-022-00428-3.
    Description: During the last deglaciation substantial volumes of meltwater from the decaying Laurentide Ice Sheet were supplied to the Arctic, Gulf of Mexico and North Atlantic along different drainage routes, sometimes as catastrophic flood events. These events are suggested to have impacted global climate, for example initiating the Younger Dryas cold period. Here we analyze the authigenic Pb isotopic composition of sediments in front of the Arctic Mackenzie Delta, a sensitive tracer for elevated freshwater runoff of the retreating Laurentide Ice Sheet. Our data reveal continuous meltwater supply to the Arctic along the Mackenzie River since the onset of the Bølling–Allerød. The strongest Lake Agassiz outflow event is observed at the end of the Bølling–Allerød close to the onset of the Younger Dryas. In context of deglacial North American runoff records from the southern and eastern outlets, our findings provide a detailed reconstruction of the deglacial drainage chronology of the disintegrating Laurentide Ice Sheet.
    Description: Open Access funding enabled and organized by Projekt DEAL.
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 8
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    Glacial-interglacial Nd isotope variability of North Atlantic Deep Water modulated by North American ice sheet (2020)
    Nature Research
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Zhao, N., Oppo, D. W., Huang, K., Howe, J. N. W., Blusztajn, J., & Keigwin, L. D. Glacial-interglacial Nd isotope variability of North Atlantic Deep Water modulated by North American ice sheet. Nature Communications, 10, (2019): 5773, doi: 10.1038/s41467-019-13707-z.
    Description: The Nd isotope composition of seawater has been used to reconstruct past changes in the contribution of different water masses to the deep ocean. In the absence of contrary information, the Nd isotope compositions of endmember water masses are usually assumed constant during the Quaternary. Here we show that the Nd isotope composition of North Atlantic Deep Water (NADW), a major component of the global overturning ocean circulation, was significantly more radiogenic than modern during the Last Glacial Maximum (LGM), and shifted towards modern values during the deglaciation. We propose that weathering contributions of unradiogenic Nd modulated by the North American Ice Sheet dominated the evolution of the NADW Nd isotope endmember. If water mass mixing dominated the distribution of deep glacial Atlantic Nd isotopes, our results would imply a larger fraction of NADW in the deep Atlantic during the LGM and deglaciation than reconstructed with a constant northern endmember.
    Description: This study was supported by National Science Foundation grants (OCE 1335191 and OCE 1811305) to D.W.O. We thank Kathryn Pietro and Mary Carman for help with lab work, Steve Galer and Jerry McManus for helpful discussions. L.D.K. acknowledges the Grayce B. Kerr Fund for supporting research cruise KNR198. N.Z. acknowledges supports by a graduate internship from National Ocean Sciences Accelerator Mass Spectrometry facility and a post-doctoral scholarship from Max Planck Institute for Chemistry. K.-F.H. acknowledges funding from Taiwan MOST (MOST 104-2628-M-001-007-MY3).
    Repository Name: Woods Hole Open Access Server
    Type: Article
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