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  • 2020-2024
  • 2000-2004  (9)
  • 2000  (9)
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  • 2020-2024
  • 2000-2004  (9)
Year
  • 1
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    Comparison of cosmogenic radionuclide production and geomagnetic field intensity over the last 200,000 years (2000)
    Royal Society of London
    In:  Philosophical Transactions of The Royal Society of London Series A-Mathematical Physical and Engineering Sciences, 358 . pp. 1089-1107.
    Details
    Publication Date: 2020-06-12
    Description: The production rate of cosmogenic radionuclides such as 10Be or 14C is known to vary as a function of the geomagnetic field intensity. It should, therefore, be possible to extract a record of palaeofield intensity from the deposition record of these radionuclides in marine or terrestrial sediments and ice cores. Field intensity variations, however, are not the only factor that has influenced the cosmogenic radionuclide records. In the case of 14C, variations of the global carbon cycle, caused by reorganization of the ocean circulation patterns from the last glacial to the present interglacial, are superimposed. 10Be is not affected by these variations because it is not part of the carbon cycle, but its deposition rates in marine sediments vary as a function of lateral sediment redistribution and boundary scavenging intensity. A global stacked record of 10Be deposition rates, corrected for sediment redistribution by normalizing to 230Thex, was shown to remove most of the disturbances, and provides a record of 10Be production rate variations over the last 200 000 years, which translates into geomagnetic field intensity variations. This dataset is compared with palaeofield intensities reconstructed from marine sediments by palaeomagnetic methods, from variations in atmospheric 14C/12C derived from independent calibrations of 14C ages, such as U/Th dating and tree ring chronology, and from 36Cl and 10Be fluxes in polar ice cores. Potential influences of the Earth’s orbital parameters and insufficient correction for orbitally triggered climate variations on the palaeointensity reconstructions are assessed. It is argued that the palaeointensity records derived from marine sediments are not significantly affected by these factors.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Long term records of erosional change from marine ferromanganese crusts (2000)
    Springer
    In:  Journal of Earth System Science, 109 . pp. 171-180.
    Details
    Publication Date: 2018-01-24
    Description: Ferromanganese crusts from the Atlantic, Indian and Pacific Oceans record the Nd and Pb isotope compositions of the water masses from which they form as hydrogenous precipitates. The10Be/9Be-calibrated time series for crusts are compared to estimates based on Co-contents, from which the equatorial Pacific crusts studied are inferred to have recorded ca. 60 Ma of Pacific deep water history. Time series of ɛNd show that the oceans have maintained a strong provinciality in Nd isotopic composition, determined by terrigenous inputs, over periods of up to 60 Ma. Superimposed on the distinct basin-specific signatures are variations in Nd and Pb isotope time series which have been particularly marked over the last 5 Ma. It is shown that changes in erosional inputs, particularly associated with Himalayan uplift and the northern hemisphere glaciation have influenced Indian and Atlantic Ocean deep water isotopic compositions respectively. There is no evidence so far for an imprint of the final closure of the Panama Isthmus on the Pb and Nd isotopic composition in either Atlantic or Pacific deep water masses.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/BF02719161
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2 (2000)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 15 . pp. 642-658.
    Details
    Publication Date: 2019-07-02
    Description: We present time series of export productivity proxy data including 230Thex-normalized deposition rates (rain rates) of 10Be, dissolution-corrected biogenic Ba, and biogenic opal as well as authigenic U concentrations which are complemented by rain rates of total (detrital) Fe and sea ice indicating diatom abundances from five sediment cores across the Atlantic sector of the Southern Ocean covering the past 150,000 years. The results suggest that 10Be rain rates and authigenic U concentration cannot serve as quantitative paleoproductivity proxies because they have also been influenced by detrital particle fluxes in the case of 10Be and bulk sedimentation rates (sediment focussing) and deep water oxygenation in the case of U. The combined results of the remaining productivity proxies of this study (rain rates of biogenic opal and biogenic Ba in those sections without authigenic U) and other previously published proxy data from the Southern Ocean (231Pa/230Th and nitrogen isotopes) suggest that a combination of sea ice cover, shallow remineralization depth, and stratification of the glacial water column south of the present position of the Antarctic Polar Front and possibly Fe fertilization north of it have been the main controlling factors of export paleoproductivity in the Southern Ocean over the last 150,000 years. An overall glacial increase of export paleoproductivity is not supported by the data, implying that bioproductivity variations in the Southern Ocean are unlikely to have contributed to the major glacial atmospheric CO2 drawdown observed in ice cores.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2000PA000497
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Radionuclids in sediment core PS1754-1 (2000)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Accumulation rate, mass; Accumulation rate, sediment, standard deviation; AGE; Alpha spectrometry; Aluminium; Aluminium oxide, rain rate; ANT-VIII/3; AWI_MarGeoChem; AWI_Paleo; Barium, biogenic; Barium, biogenic rain rate; Beryllium-10; Beryllium-10, decay-corrected; Beryllium-10, rain rate; Calculated; Density, dry bulk; DEPTH, sediment/rock; Fractionation factor, error; Gas chromatography; Gravity corer (Kiel type); Iron; Iron, rain rate; Marine Geochemistry @ AWI; Meteor Rise; Opal, biogenic, rain rate; Opal, biogenic silica; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/278; PS1754-1; Sedimentation rate; Sedimentation rate, standard deviation; SFB261; Silicon Cycling in the World Ocean; SINOPS; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Thorium-230 excess; Thorium-230 excess, decay-corrected; Thorium-232; Uranium; Uranium-234; Uranium-238; Vertical rain rate; Vertical rain rate, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 1073 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Radionuclids in sediment core PS1754-2 (2000)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Accumulation rate, mass; Accumulation rate, sediment, standard deviation; AGE; Aluminium; Aluminium oxide, rain rate; ANT-VIII/3; AWI_MarGeoChem; AWI_Paleo; Barium, biogenic; Barium, biogenic rain rate; Calculated; Density, dry bulk; DEPTH, sediment/rock; Fractionation factor, error; Gas chromatography; Giant box corer; GKG; Iron; Iron, rain rate; Marine Geochemistry @ AWI; Meteor Rise; Opal, biogenic, rain rate; Opal, biogenic silica; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/278; PS1754-2; Sedimentation rate; Sedimentation rate, standard deviation; SFB261; Silicon Cycling in the World Ocean; SINOPS; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Thorium-230 excess; Thorium-230 excess, decay-corrected; Thorium-232; Uranium; Uranium-234; Uranium-238; Vertical rain rate; Vertical rain rate, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 174 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Radionuclids in sediment core PS1756-5 (2000)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Accumulation rate, mass; Accumulation rate, sediment, standard deviation; AGE; Alpha spectrometry; Aluminium; Aluminium oxide, rain rate; ANT-VIII/3; AWI_MarGeoChem; AWI_Paleo; Barium, biogenic; Barium, biogenic rain rate; Beryllium-10; Beryllium-10, decay-corrected; Beryllium-10, rain rate; Calculated; Density, dry bulk; DEPTH, sediment/rock; Fractionation factor, error; Gas chromatography; Gravity corer (Kiel type); Iron; Iron, rain rate; Marine Geochemistry @ AWI; Meteor Rise; Opal, biogenic silica; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/284; PS1756-5; Sedimentation rate; Sedimentation rate, standard deviation; SFB261; Silicon Cycling in the World Ocean; SINOPS; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Thorium-230 excess; Thorium-230 excess, decay-corrected; Thorium-232; Uranium; Uranium-234; Uranium-238; Vertical rain rate; Vertical rain rate, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 2426 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Radionuclids in sediment core PS1756-6 (2000)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Accumulation rate, mass; Accumulation rate, sediment, standard deviation; AGE; Aluminium; Aluminium oxide, rain rate; ANT-VIII/3; AWI_MarGeoChem; AWI_Paleo; Barium, biogenic; Barium, biogenic rain rate; Calculated; Density, dry bulk; DEPTH, sediment/rock; Fractionation factor, error; Gas chromatography; Iron; Iron, rain rate; Marine Geochemistry @ AWI; Meteor Rise; MUC; MultiCorer; Opal, biogenic silica; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/284; PS1756-6; Sedimentation rate; Sedimentation rate, standard deviation; SFB261; Silicon Cycling in the World Ocean; SINOPS; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Thorium-230 excess; Thorium-230 excess, decay-corrected; Thorium-232; Uranium; Uranium-234; Uranium-238; Vertical rain rate; Vertical rain rate, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 80 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Radionuclids in sediment core PS1768-1 (2000)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Accumulation rate, mass; Accumulation rate, sediment, standard deviation; AGE; Alpha spectrometry; Aluminium; Aluminium oxide, rain rate; ANT-VIII/3; AWI_MarGeoChem; AWI_Paleo; Barium, biogenic; Barium, biogenic rain rate; Beryllium-10; Beryllium-10, decay-corrected; Beryllium-10, rain rate; Calculated; Density, dry bulk; DEPTH, sediment/rock; Fractionation factor, error; Gas chromatography; Iron; Iron, rain rate; Marine Geochemistry @ AWI; MUC; MultiCorer; Opal, biogenic silica; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/311; PS1768-1; Sedimentation rate; Sedimentation rate, standard deviation; SFB261; Shona Ridge; Silicon Cycling in the World Ocean; SINOPS; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Thorium-230 excess; Thorium-230 excess, decay-corrected; Thorium-232; Uranium; Uranium-234; Uranium-238; Vertical rain rate; Vertical rain rate, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 110 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Unknown
    Radionuclids in sediment core PS1768-8 (2000)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Accumulation rate, mass; Accumulation rate, sediment, standard deviation; AGE; Alpha spectrometry; Aluminium; Aluminium oxide, rain rate; ANT-VIII/3; AWI_MarGeoChem; AWI_Paleo; Barium, biogenic; Barium, biogenic rain rate; Beryllium-10; Beryllium-10, decay-corrected; Beryllium-10, rain rate; Calculated; Density, dry bulk; DEPTH, sediment/rock; Fractionation factor, error; Gas chromatography; Gravity corer (Kiel type); Iron; Iron, rain rate; Marine Geochemistry @ AWI; Opal, biogenic silica; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/311; PS1768-8; Sedimentation rate; Sedimentation rate, standard deviation; SFB261; Shona Ridge; Silicon Cycling in the World Ocean; SINOPS; SL; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents; Thorium-230 excess; Thorium-230 excess, decay-corrected; Thorium-232; Uranium; Uranium-234; Uranium-238; Vertical rain rate; Vertical rain rate, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 1686 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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