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  • Other Sources  (6)
  • AGU (American Geophysical Union)  (5)
  • Springer  (1)
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  • 1
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    Radiocarbon-based chronology for the 18O/16O record for the Last Deglaciation (1988)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 3 (4). pp. 509-515.
    Details
    Publication Date: 2016-06-15
    Description: A radiocarbon-calibrated box model for today's ocean suggests that a lag of about 1750 years should exist between the arrival of the midpoint of the deglaciation 18O signal in the deep Atlantic Ocean and its arrival in the deep Pacific Ocean. In order to assess the actual lag, we have carried out accelerator radiocarbon measurements on two cores from the Atlantic Ocean and one core from the Pacific Ocean. Although the results are not definitive, there is a suggestion that the actual time lag was about 1000 years.
    Type: Article , PeerReviewed
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  • 2
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    The chronology of the last Deglaciation: Implications to the cause of the Younger Dryas Event (1988)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 3 (1). pp. 1-19.
    Details
    Publication Date: 2016-06-16
    Description: It has long been recognized that the transition from the last glacial to the present interglacial was punctuated by a brief and intense return to cold conditions. This extraordinary event, referred to by European palynologists as the Younger Dryas, was centered in the northern Atlantic basin. Evidence is accumulating that it may have been initiated and terminated by changes in the mode of operation of the northern Atlantic Ocean. Further, it appears that these mode changes may have been triggered by diversions of glacial meltwater between the Mississippi River and the St. Lawrence River drainage systems. We report here Accelerator Mass Spectrometry (AMS) radiocarbon results on two strategically located deep-sea cores. One provides a chronology for surface water temperatures in the northern Atlantic and the other for the meltwater discharge from the Mississippi River. Our objective in obtaining these results was to strengthen our ability to correlate the air temperature history for the northern Atlantic basin with the meltwater history for the Laurentian ice sheet.
    Type: Article , PeerReviewed
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  • 3
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    Preliminary estimates for the radiocarbon age of deep water in the glacial ocean (1988)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 3 (6). pp. 659-669.
    Details
    Publication Date: 2016-06-15
    Description: Radiocarbon ages for benthic and planktonic foraminifera from the late glacial sections of two Atlantic and two Pacific cores are reported. The differences for benthic-planktonic pairs suggest that the radiocarbon age for deep Atlantic water was somewhat larger than today's (i.e., 600±250, as opposed to 400 years) and that the radiocarbon age for deep Pacific water was also slightly larger than today's (2100±400, as opposed to 1600, years). Our results suggest that during glacial time, the deep Pacific was, as it is today, significantly depleted in radiocarbon relative to the deep Atlantic. As many questions remain unanswered regarding the reliability of this approach, these conclusions must be considered to be preliminary.
    Type: Article , PeerReviewed
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  • 4
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    The Influence of CaCO3 Dissolution on Core Top Radiocarbon Ages for Deep-Sea Sediments (1991)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 6 (5). pp. 593-608.
    Details
    Publication Date: 2016-06-16
    Description: Radiocarbon ages on CaCO3 from deep-sea cores offer constraints on the nature of the CaCO3 dissolution process. The idea is that the toll taken by dissolution on grains within the core top bioturbation zone should be in proportion to their time of residence in this zone. If so, dissolution would shift the mass distribution in favor of younger grains, thereby reducing the mean radiocarbon age for the grain ensemble. We have searched in vain for evidence supporting the existence of such an age reduction. Instead, we find that for water depths of more than 4 km in the tropical Pacific the radiocarbon age increases with the extent of dissolution. We can find no satisfactory steady state explanation and are forced to conclude that this increase must be the result of chemical erosion. The idea is that during the Holocene the rate of dissolution of CaCO3 has exceeded the rain rate of CaCO3. In this circumstance, bioturbation exhumes CaCO3 from the underlying glacial sediment and mixes it with CaCO3 raining from the sea surface.
    Type: Article , PeerReviewed
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  • 5
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    Comparison between radiocarbon ages obtained on coexisting planktonic foraminifera (1988)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 3 (6). pp. 647-657.
    Details
    Publication Date: 2016-06-15
    Description: As a test of the reliability of paleocean ventilation rates reconstructed from radiocarbon age differences between planktonic and benthic foraminifera, measurements have been made on coexisting species of planktonic foraminifera. While ideally no differences should exist, we do find them. In this paper we discuss the possible causes for these differences and attempt to evaluate their impact on the interpretation of benthic-planktonic age differences.
    Type: Article , PeerReviewed
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  • 6
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    The manganese nodules of the Kane Gap (East Atlantic). Indicators of sedimentation — erosion changes (1989)
    Springer
    In:  Geologische Rundschau, 78 (3). pp. 943-958.
    Details
    Publication Date: 2019-02-01
    Description: Manganese nodules from the Kane Gap (a deep sea channel connecting the Sierra Leone and Gambia Basins off West Africa) were investigated chemically and dated by10Be along cross-sections. Comparing the nodule structure with the stratigraphy of the related sediments, the following conclusions are drawn concerning the sedimentation processes during the last 4 to 6×106 years: The growth of the nodules started about 4 to 4.5 Ma before present during or near to the end of a period of erosion on a fossil-free, probably Miocene sediment. During the first phase of only a few hundred thousandyears, the nodules grew very quickly (7 to 〉18 mm/Ma). Fe-rich hydrogenetic material formed the internal sections of the nodules during this time. Slowing down of the bottom currents, resulting in deposition of thin sediment covers for short intervals, caused the character of the nodules to change to a more diagenetic composition. The growth rates were reduced to about 1 to 2 mm/Ma. The time of slowing is roughly 3 to 4 Ma BP. Probable uncertainties of the dating and growth rates resulting from supposed changes of the10Be supply to the nodules due to variations of the near bottom environment are discussed.
    Type: Article , PeerReviewed
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